The Two Sisters

[dunhill]

This is the translation of my german story "Zwei Schwestern", originally published here: [url="http://german.literotica.com/s/zwei-schwestern-1"]My link[/url]

With the help of our fellow member lordodie it was possible to do a translation into english.

I'd also like to take this chance to say [b]THANK YOU[/b] to lordodie for investing lots of hours in editing the translated version. Without his help this translation would not have been possible.


And now have fun with my sweet, sweet anal addicted girls...



[b]“The Two Sisters”[/b] ©by dunhill (aka fantasywriter).


[b]Chapter 1: Prehistory[/b]

Two sisters, Anita, 21 years old and Birgit, an 18 years old teenager, were talking one evening about sex.

In recent years the sisters didn't get together so much anymore, because Anita had gone away from home right after her high school graduation three years ago to start studying medicine at a distant university. Now Birgit had finished school and maybe wanted to study too, but she did not quite know what profession, so her parents suggested she could visit her elder sister for a few weeks, join the university as a guest and then make her decision.

A few days after Birgit had arrived at her sister's, the two girls sat with a bottle of white wine in Anita's living room during the evening and talked about very intimate subjects.

Anita asked Birgit if she had ever slept with a boy. Birgit said clearly I have had some guys,you know that. Until recently I had a boyfriend, but he betrayed me after a party. Right now I'm single, but that will hopefully change soon. I miss the sex very much, she admitted under a broad grin.

Anita asked her sister what she preferd during sex. Birgit said that she loves to be licked and that she'll let prefers doggy style. From that she orgasms pretty quickly.

I see, doggy ... Anita said. Have you already tried anal? No, Birgit admitted.

Anita said that she had already missed very much. Birgit said that she had thought about it, but she was pretty scared of her anal defloration.

Anita asked Birgit if she has ever been to the gynecologist. Not lately, Birgit said.

Anita said that she often goes to one particular gynecologist; were other special treatments also take place. What kind of special treatments Birgit asked curiously.

Let yourself be surprised, Anita said.

[b]Chapter 2: Birgits defloration[/b]

So both went to the doctor two days later.

Arriving at the Reception of the large and spacious practice Anita enrolled Birgit to the special treatment. Birgit was quite surprised that the receptionist seemed to know her sister so well because she knew Anita's name, asked her about her health, who she brought with her and what for a treatment she wishes, since today is not her regular appointment day.

Anita introduced her sister, and said that today Birgit wanted to get some treatments. The receptionist introduced the two girls to the doctor.

After a short wait, the doctor received the two in his office.

The doctor was very familiar to Anita and asked what kind of special treatment her sister would like.

Anita explained to him that Birgit was still an anal virgin, and that she had no experience with anal sex yet. She should be deflowered anally and maybe give her an enema before some other medical games. Enema? Birgit it felt a little queasy.

The doctor turned back to Birgit and told her that she should undress except for her bra and panties.

Birgit hesitated a bit, but Anita encouraged her and helped her to undress. The doctor said to Birgit that he wants to examine her first. Go over to the scale so that we can determine your weight.

So please take off your bra. Anita helped Birgit and told her that she must not be afraid since the doctor would deal with her very carefully.

The doctor came and palpated her small, firm breasts, which caused her nipples to harden. Then he recorded her pulse and blood pressure before he asked Birgit to take off her panties and to bend forward over the couch. Birgit asked what he was doing there. Anita said that he would examine her anus. The doctor put on a examination glove and put some lubricant on Brigit's anus. Birgit wanted to straighten up again but Anita pushed her back down and told her to stay down. The doctor massaged the lube in for a long time and then penetrated Birgit's anus slowly and carefully with his finger to check whether she could be anally deflowered easily.

Birgit groaned slightly and wanted to rebel but Anita held her down.

Ok, the doctor said, we will now go over to the examination room. There was a gynecological examination chair and a nurse was already waiting. The doctor told Anita that she could undress too. The doctor asked Birgit to sit down on the gyno chair. Birgit sat down. The nurse took her legs and put them into the stirrups. The nurse then pushed the leg supports far apart so the doctor would have a good look at Birgit's vagina. The doctor told the nurse that she should shave Birgit at first.

Anita was fully undressed now and stood next to Birgit. The nurse shaved Birgit's pubic hair and despite the unfamiliar situation Birgit got hot. Well, the doctor said, now we administer a small cleansing enema. Birgit did not want to get one because she was afraid. The doctor said that he could show it to her first by giving an enema to Anita. So he asked Anita if she would agree. Anita said with a grin that she had been looking forward to.

The nurse asked Anita to bend over so she could prepare her anus for the enema.

Anita did not have to be told twice . She immediately leaned forward so that her ass was easily accessible. The nurse took a examination glove and some lube and began lube her sweet ass; easily penetrating her anus with two fingers. The doctor prepared the enema.

Birgit watched her sister from close up. The doctor told Anita she should lie down on the gynecological examination chair now. The nurse took her legs and pushed them far up and far apart so that the doctor could push the enema tube deep into her bowels.

Anita moaned as the doctor let the enema flow slowly into her ass. Anita moaned louder and louder, her pussy was all wet. Her vaginal lips were swollen right now and open so that you could see her little peehole.

Anita told her sister that she should not be afraid and that the enema will make her really horny. Then the whole enema was into Anita's sweet ass. The nurse pulled out a tray under the chair and Anita was allowed to drain. A strong gush of water she spilled her gut contents into the bowl. The doctor asked Anita if she would also like a bladder cleansing. She said that she would find this extra hot.

Birgit asked what a bladder cleansing was. The doctor told her that there would be a tube inserted through Anita's urethra into her bladder. The nurse now strapped Anita's legs tightly to the chair and pressed them further apart so that the vagina was opened as far as possible. The doctor took the catheter out of its package and the nurse pushed the labia far apart so the doctor had good access to the urethra.

He inserted the catheter into her peehole until some urine ran out of the catheter; the nurse caught the pee in a glass. Anita moaned delightfully. Now the doctor secured the catheter a in her bladder with a small balloon at its end with a syringe. Then he took a large syringe and pushed the cleansing fluid slowly into her empty bladder. Anita was no doubt horny; her pussy juice was seeping out of her pussy.

The doctor pumped three full injections into Anita before she had enough fluid in her bladder. Birgit had watched attentively. The syringes contained 250 ml of liquid each, which seemed to her an enormous amount. Well, thought Birgit, this really isn’t my sisters first time to get a bladder cleansing! The doctor let the air out of the balloon and slowly pulled the catheter out of her.

Anita groaned and immediately emptied her bladder in a strong jet.

The nurse now took a vibrator and put it in Anita's pussy and brought her to climax. The doctor said to Birgit you're next, no need to be afraid.
Birgit was told to lie down on the chair but she still hesitated .

The nurse and Anita finally laid her down and strapped her legs tight to the chair. The nurse also spread her legs wide apart. The doctor asked Anita what he should administer first. Anita said that he should empty her bladder first. Birgit didn’t want this but Anita told the doctor that he should insert the catheter. He took a much thinner catheters than the one he had used on Anita. Birgit calmed down somewhat.

The nurse opened the labia quite far and Birgit's little pisshole stood out provocatively so that the doctor could insert the tube into her urethra.
He told Anita that she should hold out the glass so that not a drop was lost. Slowly it began to dribble out of the tube, the doctor pushed the tube further in and then a nice stream came out of Birgit's bladder. Birgit moaned loudly. Anita asked her Sister what she felt, Birgit said softly with a blush on her face that she liked it. Birgit's pussy was again really moist.

Then Brigit's first enema was ready. The nurse massaged her clitoris and Birgit began to moan. Now the doctor took the catheter and shoved it into Birgit's ass. She moaned slightly as the catheter penetrated her bowels deeper and deeper. Anita held Brigit's small ass cheeks far apart so the doctor had proper access to Birgit's butt. When the tube had disappeared into her, the doctor opened the clamp and the mild water slowly filled Birgit's intestines. First, she found it quite uncomfortable, but the slow flow and the heat of the water let her relax. Well, it’s not that bad, she thought.

The doctor said to the nurse: We will now remove the hose so she can empty the first enema before we insert it again. The doctor pulled the tube out of her and the nurse unbuckled her legs. Birgit, please squat now above this vessel and push everything out.

Birgit pressed and everything rushed out of her guts. The nurse said she should now bend forward so she could see if her rectum is empty. She put on an examination gloves and penetrated her little anus gently with a finger. Birgit groaned again. The doctor said that Birgit would now receive her next enema in a different position.

The doctor instructed the nurse to prepare the other chair so that he could insert an enema tube again.

This chair actually looked more like a frame, it had two padded rests for knees and lower legs on which they can be fixed by leather straps. Additional padded supports for the arms were attached, also with leather straps and a short platform for the upper body.

The nurse and Anita brought Birgit to this frame. She had to kneel on it and bend her upper body forward.

The nurse adjusted the rests to Birgit's height, strapped her legs to the rests and shackled her upper body and arms. Birgit now had no chance to resist this procedure. Well, thought Birgit, at least this is my favorite position…

Now her legs were spread apart and the upper body was moved down, giving the doctor free access to Birgit's anus. The doctor told the nurse that she should now take a longer hose so that it can be inserted deeply into Birgit's gut.

Anita prepared Birgit's butt. She took a syringe filled with lubricant and with a slight pressure she injected the fluid in Birgit's rectum. Birgit slightly moaned.

Now the doctor came with the hose and put it into her bowels;it was about 40 cm long.With gentle motion he inserted the tube. Birgit struggled a bit but she had no option to resist.

When the whole length of the tube was inserted the assistant opened the clamp. Birgit's labia were again really swollen and showed how wet she was. Anita and the assistant noticed this also; they smiled at each other.

The nurse caressed Birgit's vagina and her clitoris. After Birgit had taken about 1.5 liters of water in her gut the doctor told the nurse to untie her so that she can empty herself.

Again Birgit had to squat over a vessel and let everything out. This sight of Birgit expelling her enema made Anita so horny that she immediately wanted a deep enema too. The doctor told her that she should go to the gemological chair and get prepared. Her legs were then spread nicely so the doctor had good access to her butt.

Anita's vagina was wide open now and the nurse put a vibrator into her. Birgit watched this game curiously.

Anita was spread on the gyno chair. The nurse fucked her lovely shaved pussy and massaged her clitoris. Anita began to moan and Birgit noticed that Anita obviously liked to be massaged by the assistant.

Now the doctor approached the examination chair. He put on examination gloves and asked the assistant to coat Anita anus with a little lubricant. The nurse did this with obvious enjoyment; under her coat her nipples erected significantly. The doctor now penetrated Anita with a finger in her ass while she moaned slightly. The doctor said that he will give her only a small enema and afterwards she would be strapped on the same kneeing-frame like Birgit.

The nurse handed the doctor a filled enema syringe. It had a capacity of 500ml of liquid and had a 8cm long, thick needle with a rounded head so that it can be easily inserted.

He pushed the syringe into her sweet butt while Anita moaned slightly, then he pushed the plunger of the syringe down so that the liquid flow into Anita's intestines.

He pulled the syringe out of her butt and the nurse handed him the second enema syringe. He just as quickly inserted the second one into her anus and injected the next 500ml.

When Anita had taken all the fluid, her bottom was sealed with a plug so that the cleaning liquid could work in for a while.

After ten minutes the retention time was over and Anita was allowed to empty herself.

The doctor told the nurse she should fix Anita on the kneeing-frame so that he could administer the high-volume enema.

Anita went to the frame and knelt on the two rests that were still fairly close together. She leaned forward on the padded rest so that her bottom was stretched out properly.

The nurse then tied her legs, arms and torso down like she did to Birgit before so Anita could not move anymore. Then she fetched a carriage with a long hose that was ready to be inserted in her horny butt. Now she rolled another IV pole from which hung a enema bag with 3 liters of liquid. The doctor told the nurse that Birgit should also put on examination gloves.

The doctor spread Anita's legs until it already hurt her a little. He shifted the front part of the frame further down so that her bottom was perfectly accessible. Then he asked Birgit to put some lube on Anita's bottom. Birgit took the lubricant and dipped her finger in it.

As she lubricated her sisters sweet ass, the doctor said she should poke a finger in from time to time. Birgit hesitated a little but the doctor helped her put her fingers deep into Anita's anus.

Then the doctor took a anal speculum and inserted it. He opened the speculum pretty wide, Birgit thought, but her sister took it without any reaction. Birgit was now able to look deep into the bowels of her sister.

He then took a thick, 80 cm long enema tube and put it into Anita's anus. With carefully rotating and sliding movements he led the tube deeper into her bowels. Anita sighed quietly. The doctor told the nurse that she should play with Anita's breasts a little bit so she would be a little distracted. Finally, the full length of the tube was inserted in her intestine. The doctor removed the speculum and inflated the two balloons of the double-bardex catheter to seal Anita's rectum.

Then he connected the hose to the irrigator and opened the clamp. The water flowed deep into her gut and Anita began to moan lustfully. She obviously enjoyed the enema. After the whole 3 liters had flown into her slim body, the doctor slowly removed the tube out of her little hole.

The nurse untied Anita and she was allowed to empty.

Well, the doctor said, now we can start Birgit's anal deflowering. Anita said that Birgit should be strapped down to the gyno chair so that she could not resist.

The doctor agreed.

Anita and the nurse strapped Birgit to the gyno chair. Birgit was a little scared.

Anita told her she should lie down on the chair, there would be no need to be afraid, they would do it very carefully and she'd already seen how the nurse had pushed her fingers into her own ass. Birgit, would you also like this treatment? Anita encouraged her.

The nurse now tied Birgit legs firmly into the stirrups and Anita fixed the arms. Then her legs were opened very wide so her anus was easily acessible. Anita said that she wanted to be the first to penetrate Birgit's anus. The nurse sat between Birgit's wide open legs and gently ran her tongue over her lips. Birgit started to moan and get aroused. You could even see some little droplets of her juice oozing from her vagina.

While the nurse was busy with Birgit's vagina, Anita chose two small anal dilators that would not be uncomfortable the first time.

The nurse told the doctor that Birgit was now ready. Anita told Birgit that we want to deflower your little anus now. We will make it very gently with a thin anal dilator. The nurse will hold your butt cheeks apart and I will put it in your ass.

The nurse opened Birgit's ass cheeks and Anita inserted the dilator slowly and carefully. Birgit made a face but after a few back-and-forth movements of the dilator she began to moan. Anita changed the dilator after some time and Birgit realized that this one was a little thicker. Nonetheless, the first awkward feeling was blown away and Birgit enjoyed the nurse’s fingers on her clit and her finger in her vagina. Not long thereafter, Birgit had her first anal orgasm.


[b]Chapter 3: Birgits Follow-up treatments[/b]

Later that day at home both girls spoke about their experience and Birgit finally admitted that she had liked her special treatment very much. First, it had been rather embarrassing. She also found the procedures to be quite perverse, but she had also noticed how much pleasure she felt during the treatments.

Birgit asked Anita how she had found out about this clinic, and how she came to the idea of being treated that way. Anita said she had experimented with anal quite early and found it very pleasurable. Her first boyfriend here was also an anal fetishist and had readily and frequently played with her ass. Her studies of course also include lectures on proctology and that there are enemas and so on. She was always aroused, Anita admitted. However, she was also afraid of her first time anal sex and went to this doctor because he is proctologist and she wanted to have professional advice.

How such advice is done Birgit had just experienced, Anita said with a grin., After 3 visits in which her anus was dilated and prepared she had had anal sex for the first time and it was beautiful. I've never had a stronger orgasm, Anita said.

Even then, Anita continued to go to the doctor and finally started a kind of training that lead her more often to this clinic.

Do you want to go there again, Anita asked. With pleasure, Birgit said sheepishly.

Three days later, the girls showed up for Birgit's second treatment. Her ass should be opened a bit more and get used to penetration. Birgit also was secretly hoping for such a great orgasm as last time.

This time, she didn't have any feelings of shame anymore and her sister did not need to intervene to prevent her from rejecting the treatments.

Again, enemas were administered to her. This time she got a high enema twice; the second time even with two liters of warm water. The enormous pressure in her body made her feel very horny. Also treatments on her sister were done. Birgit wondered again how much her sister could stand as it didn't seem to be unpleasant for her. Birgit was particularly impressed when her sister took a high enema with 3 liters of water and then didn't expelled immediately, but got an - in Birgit's opinion - huge plug pushed into her anus and kept the large enema in for a long time; until the end of their treatments.

Birgit made the third visit to the clinic on her own. She wanted to be stretched a little more so that she could take a real cock easily. She also wanted to get a bladder cleansing. To see her sister moaning with lust during the last two times Anita's bladder was filled had made her curious to experience this treatment for herself.

The receptionist greeted her kindly and asked Birgit briefly to sit down in the waiting room for a moment. Some other women were waiting for their treatments and Birgit wondered if all the patients were given such treatments like she and her sister got. The waiting room was no different at all to the other clinics where she had been before.

Finally, she was called into a consulting room. The doctor came and talked with her briefly about the upcoming treatments. When he asked Birgit for her wishes, she told him after some hesitation that she would also like a bladder cleansing. He smiled as he told her that this would be no problem.

He then called for the nurse and told her she should clean Birgit internally first before he would join them for the bladder treatment.

The nurse led Birgit into the well known treatment room and asked her to undress and lie down in the gynecological chair. Without hesitation, Birgit sat in the chair and let the nurse strap her legs and spread them widely. As the nurse explained to her she got two smaller enemas of one liter each. The nurse massaged her anus with lube. As she inserted her fingers into her anus, distributing the lubricant inside Birgit's asshole, Birgit realized how aroused she was and how wet her pussy got. The nurse used the enema syringes to fill her slowly. Birgit was allowed to drain into the bowl attached to the chair and did not need to stand up. After the enemas, the straps were released and Birgit was then strapped onto the rack for her high cleansing enemas.

Birgit found it was awesome to be tied. Before the nurse introduced the long intestinal tube with the double balloon seal, her asshole was again massaged and moisturized. When the balloon was inflated in her rectum, Birgit groaned with sheer enjoyment. Slowly she could understand why her sister came here so often. The clamp was opened and slowly 1 ½ liters of pleasantly warm water poured into Birgit's receptive intestine. She had to keep it in for 10 minutes, which gave her no more problems. Then she was allowed to empty herself out. Afterwards she knelt down on the rack to be strapped down again.

Again she enjoyed the insertion of the seeming endless intestinal tube. When Birgit had already taken two liters, she asked the nurse not to stop flow into her. Her sister had received 3 liters every time without the slightest problem, Birgit remembered. The nurse started the enema again and slowly massaged her belly which was noticeably swollen. Birgit finally realized that she was full to the point ofoverflowing, and asked the nurse to stop. After all, she had been able to absorb 2.4 liters, which she had to hold five minutes. Although she felt very full, it was not unpleasant; more exciting.

After she had emptied, she was strapped back on the gyno chair. The nurse inserted a catheter and emptied her well filled bladder, then called the doctor.

Well Birgit, then let's fill your bladder as you had wished. He put one of the prepared enema syringes on the catheter and pushed the liquid slowly into Birgit's bladder. Wow, that was cool! Like her sister Birgit moaned with sheer lust. After two of the syringes, her bladder felt very full and she felt like she urgently needed to go to the bathroom.

Because her urethra was blocked by the catheter she could relax. The doctor noticed that she was full and pulled the syringe out. The nurse handed him a vibrator and began to massage Birgit. Due to the fullness in her bladder, the pre-orgasmic-waves were even more intense than usual, and seconds later she pulled at her bonds with a mega-orgasm. The doctor opened the catheter's closure and the water ran into the prepared glass; Birgit enjoyed this feeling. Now she understood her sister completely.

When her bladder was empty she was undone and then asked to kneel down onto the frame again and be strapped. She should be stretched a little so that Birgit could easily accommodate a penis in her ass. The doctor then took a small anal speculum and put it in Birgit's lubricated asshole. Slowly he turned the blades open, made repeatedly breaks so that Birgit got used to the feeling, and turned it further open little by little. It hurt quite a bit but finally the experienced doctor stopped at exactly the right moment. He left the speculum open for a moment and then turned it back. He repeated this procedure three times and each time Birgit felt it easier to open up.

He then took the already familiar dilators and inserted one, fucked her a little with it before he moved up to the next size. Birgit was in heaven. Anal was so cool! Her sister was absolutely right that she has been missing so much during sex. Finally, the doctor took a dilator the size of a normal penis, as he said. Birgit felt this quite distinctly in her little ass. When the full diameter penetrated her, she took a deep breath and had to clench her teeth. As previously, the pain ceased very quickly and gave way to more pleasant feelings. The doctor pulled the dilator from her and showed it to Birgit; she was surprised. Such a huge thing was just plugged into me? The dilator was actually the size of a huge prick; Birgit estimated about 5 cm in diameter,. She was impressed and proud of herself. The doctor gave the dilator to the nurse and she slowly fucked Birgit for a long time. Finally, she massaged her now leaking pussy and clit. Slowly, an insane orgasm built up in Birgit and she cried out her pleasure when she came.



[b]Chapter 4: Anita's confession[/b]

A few days after Birgit's last visit to the clinic, the two talked about their treatments and Birgit asked Anita what she had recently meant with “training” and what she had to undergo during this training. Anita told Birgit that she had a very distinctive anal fetish and she underwent ever more powerful treatments. Because of that, she was very well trained and her anal treatments had become quite extreme. How long have you been doing this, asked Birgit. For the past two years I've regularly gone there twice a month. I'm there once a month for one day, and the other one is a two-day training. If you wish, you may join me at my next two-day appointment. It will take place in five days.

Birgit gratefully accepted the offer, even if she was a little queasy, because she could imagine that the training treatments were even higher quality than the ones which she had previously witnessed. Birgit was very curious.

Three days before the begin of the training, Anita fetched a special liquid food from a cupboard. She explained to Birgit that she must have a completely empty digestive tract during the two days of her anal training and that this food was filling, very highly digestible and would leave no solid residues in her intestine. Birgit got more and more excited about what she should witness soon.

In the evening before the training day, both went to bed very early because Anita said that before her stood two very exhausting days, and she wanted to be relaxed and rested. Also, the training would start at eight clock in the morning. Anita did some meditation exercises and actually fell asleep quickly.

Birgit, however, laid awake thinking about what the next two days would bring. The whole thing seemed a little scary to her, especially since Anita had forewarned her that what she would see in the next days may seem very violent. Birgit should not intervene in any way and only watch silently even if she saw that Anita had to suffer a lot or that she was of the opinion that this was no longer fun for her sister. Birgit should always keep in mind that these treatments are wanted by Anita and that she got very hot by this training.

[b]Chapter 5: Anita's training begins[/b]

The two rose early in the morning at half past six, showered and got ready quickly. Anita just drank a glass of water for breakfast and was very calm and collected. Sure she is preparing herself for her training, thought Birgit. Finally, they went to the clinic. On foot, they reached it in a quarter of an hour. Anita rang the bell, because the clinic does not officially open before nine o’clock. The door camera moved and seconds later the buzzer sounded. Anita again took a deep breath and opened the door. What will go on in here, wondered Birgit.

Although not entirely comfy, Birgit was pretty excited. The receptionist greeted the two as usual and picked up the phone. Dr. Lay, your training-patient has arrived, she said into the phone. She asked the two to wait and shortly afterwards a roughly 35-year-old, very good looking woman in lab coat with firmly bound, blond hair came from the back of the corridor. She didn't wear the usual sandals but rather fairly high heeled black leather boots; which were apparently hidden under her white pants. She smiled with a stern face and greeted the two sisters.

Normally during training treatments no guests were allowed, she explained to Birgit, but since you are sisters, and also you both have been treated here, this exception is possible. They went ahead into the long corridor where the treatment rooms were. However, she did not lead the girls into one of the rooms but went up to a door at the end of the corridor, where a sign saying "private" was attached. The door had only a knob and Dr. Lay opened it with a key. I see, Birgit said to herself, so there are more rooms that aren't publicly available. Behind the door was another short hallway and then a staircase leading up to the next floor.

At the top, there was a very thick door, which could be also only opened with a key. On the second floor of the clinic was a similar spacious corridor like the one below; just the waiting room and the reception were missing here . One of the first doors was open; it was Dr. Lay's office. She asked Birgit to go in and said to Anita that she could go ahead into changing room no. 2 and undress. Assistant Simone would pick her up immediately. Dr. Lay closed her office’s door and asked Birgit to take a seat.

The office had bookshelves alternating with white cabinets. However, on the shelves were apparently less medical books but more probably illustrated books and also other erotic novels, like Birgit surmised after a brief inspection. Some erotic drawings were hung on the walls, but otherwise it looked like in a regular office.

Dr. Lay told Birgit that in the next two days some very extreme and violent anal treatments will be performed on her sister and these are very different from those ones in the clinic downstairs. Although she is allowed to watch, she must strictly adhere to the instructions of the staff and that she should not disturb the treatments under any circumstances. It would certainly not be easy for her and she was to sit absolutely silent while her sister suffers from her treatments. You should make it clear to yourself that Anita wants these treatments and that they were agreed with her sister before, Dr. Lay said.

Anita was diagnosed as an anal-masochistic, that would mean that by the sensation of pain inflicted to her during anal play she will reach the highest pleasure. Although it is not easy to understand for outsiders, her sister asks for these extreme anal therapies to satisfy her lust. This is the reason why no guest is permitted normally.

For herself some soft treatments will be provided, similar to those which she had received downstairs. Since her sister’s training treatments will take some time, she could experience disruption with own treatments. The assistants would address Birgit at the appropriate time.

Birgit was finally led into changing room four where she should undress. Her clothes had to be put in the provided closet. Assistant Simone would also pick up her there.

In the cabin, Birgit was even more excited than before. What would she get to see soon? What will Anita have done to her? Meanwhile it dawned upon Birgit that she would soon see things that she previously thought to be totally impossible; and her sister was a masochist? Although she had already read about it, she never thought that Anita was like that. Nervously she awaited the assistant.

A short time later the door opened and assistant Simone introduced herself. She was dressed in a nurse's uniform, except that it was made out of white latex. Coat, skirt, apron and even the hood were made of this material. She was wearing white stockings and see-through lace-up boots with high, also transparent heels. The dress had red piping and a red cross has been affixed on the hood. After the initial shock Birgit found Simone's whole outfit pretty sexy.

Please come along, the assistant said with a friendly smile and Birgit was led to a treatment room with two opposing gynecological chairs. Anita was already strapped onto one of the chairs while another assistant in the same clothes as Simone administered an enema to her.

Both of you will now get two short cleansing enemas, and after that a bath in the hot tub with a relaxing colonic irrigation is scheduled. Then you'll be clean enough for your treatments.

Colonic irrigation in a hot tub? That does not sound bad, thought Birgit, as she took place on the second gyno chair in the room.

Her legs were placed in the stirrups, however, these ones were much more massive than the ones used downstairs in the clinic. There were additional supports for the feet, which assistant Simone had adjusted to Birgit's body. Then she was strapped onto the chair. Her feet, legs, arms and even her hands were tightly bound with latex bands. Above her chest a wide belt was set and secured, and finally her head was also belted to the chair-back.

The assistant lubricated Birgit's anus and massaged it skillfully before widening it slightly with her latex covered fingers. In spite of the early morning hour, initial erotic feelings flooded through Birgit's young body and she quickly got very horny. Then the assistant rolled in a IV-stand with a filled enema bag and inserted a short enema nozzle in Birgit's anus and started the flow. Birgit had to take one liter, then she could expel in a special bowl that has been attached to the chair.

Her sister had probably just emptied herself, because the other assistant fetched another IV-stand on which dangled another well-filled enema bag. This one was pretty big; about as big as the one they had used on Anita downstairs. Birgit estimated that at least three liters of water must be sloshing in it because when Simone brought Birgit's 2nd bag she said that Birgit now would get 1.5 liter; and this bag was clearly only half as large!

Gee, Birgit thought, Anita is getting ran through the ringer right from the very start! Additionally, the nozzle used on her was very thick, but Birgit didn't hear a single sound from her sister as the nozzle was inserted and the flow started. Although she had to absorb twice the amount as Birgit, it took only a little more time until Anita's bag had run empty too. Birgit felt quite full after the 1.5 liters and was glad when she was allowed to drain after a retention period of only five minutes. Anita had to keep her huge enema in for a quarter of an hour while the assistants had the chance to take care of Birgit first.

First, a special enema tube was inserted into Birgit's large intestine for the upcoming colonic irrigation. This consisted of an 80 cm long colon tube and a stopper for the anus. This ensured that the water that will be pumped into Birgit's bowels will stream out at the end of the colon tube located at the beginning of Birgit's large intestine. During the rinsing cycle all digestive residues will be carried together with the water towards the anus, she was told. In addition to the mounted intake tube the stopper had a correspondingly dimensioned opening for a screw-in draining tube.

The plug-like stopper for Birgit was only about four centimeters in diameter, so that she could take it easily. Birgit noticed only a slight discomfort as the full diameter of the stopper was pushed into her ass. The previous stretching treatment had really paid off! Finally, her bladder was emptied using a catheter and Birgit was ready for her irrigation.

Then Anita was prepared.

First, she was allowed to drain, which, given the bigger quantity, took much longer than for Birgit. One of the assistants prepared the rectal tube. Birgit saw that this one was much thicker than hers, in the hands of the petite assistant this tube looked huge! Also the thick stopper was not shaped like a plug, in fact it had a rounded tip and was otherwise cylindrical.

Simone rubbed Anita's anus with lube and then took a large anal speculum to give Anita a pre-stretching. Making no bones about it, Simone pressed the speculum into Anita's sweet little asshole and turned it open slowly. Anita still did not make a sound and endured the procedures with closed eyes. Assistant Simone turned the speculum open and close several times before her colleague handled her the colon tube. She pushed the thick, well-greased tube into Anita's wide open anal orifice.

The other assistant supported the insertion with an abdominal massage. Nevertheless Simone had to repeatedly move back and forth and twist so that the thick hose slipped through Anita's intestinal loops. Every now and then a stronger breath was audible from Anita. Then it was time to insert the stopper. The speculum was removed from Anita's butt and Simone pressed the thick stopper into Anita. She went through it straight-faced. Wow, thought Birgit. My sister is really able to tolerate a lot, as she can take such a big plug and be unaffected.

Then the second assistant handled a small syringe to Simone; she applied it to the stopper and pressed the plunger down halfway. Birgit did not immediately understand what was going on because the stopper didn’t change and there was no noticeable reaction to be seen by her sister. Simone pulled back the syringe and applied it again. Now Birgit saw a ridge formed out of the surface of the stopper; its inflated counterpart inside Anita's rectum now tightly gasketed the stretched sphincter. Fully inflated, the ridge looked like a bicycle tire's inner tube. I see, thought Birgit, thereby Anita's anus is properly sealed from both sides.

Then a Foley catheter was inserted into Anita's urethra. Simone first applied some sterile lubricant into the urethra and then her colleague handled her the pretty thick catheter. Birgit's eyes widened because she guessed the catheter to be about 8mm in diameter. She looked into Anita's face as Simone inserted the hose and slowly pushed it into Anita's urethra. Anita was lying there with her eyes closed, breathing in and out calmly. No wince was to be seen in her face. Birgit was impressed. Then Anita's bladder was emptied and the catheters balloon was inflated. In addition, Simone installed a gasket ring on the catheter and with it she fixed the catheter inside Anita's body. Anita was unbuckled and Simone led the two sisters to the bathroom next door.

At her first panoramic view the room appeared to Birgit to be like a typical clinical bathroom. White tiled up to the ceiling, spacious, on the walls various fittings and connections were mounted. In a corner a large tub-less shower could be seen which was integrated into the room, there was a French squatter with handles on the wall and of course the yet empty hot tub. However, this one had little in common with what is generally understood as a Jacuzzi. This one looked more like a large, oblong bathtub that was not sunk-in as usual but stood there above-ground, so that the assistants had easy access to it from all sides. Inside the tub seat-shells were molded in, as Birgit noticed after a quick glance.

Behind the tub several devices were mounted onto the wall. In front of them the other assistant sat down onto an office chair. Birgit saw valves, pressure gauges and other meters, also some chrome pipes came out of the wall and disappeared into these switch boxes. Probably this is the controller for the Jacuzzi and the colonics she thought.

Please step in, Simone said to Anita. As she climbed into the tub, Birgit saw that the seats were also fitted with latex bonds. She had not noticed this at first glance because of their white color.

Anita sat down in the tub. The supports for the legs were attached at a 90° angle so that the legs were spread wide. In addition, the entire seat was tilted back about 45° to allow the patient a relaxed posture. The seating area was cut out in the shape of an omega so that the tubes protruding out of the girl's orifices dangled unhindered. Also, supports for the arms were molded into the tub on which Anita's arms were now shackled. Her legs were fixed also and finally a wider straps was attached above her breasts and pulled tight. The tubes were now screwed into connectors under the seat. Birgit's horniness crept up because she would be soon strapped down into the tub in exactly the same way as Anita; she felt the constant bondage to be pretty hot.

Certainly, the plug and the long colon tube contributed to her excitement; which Birgit could feel inside her bowels at every movement. After Anita was strapped down tight it was Birgit's turn. The two sisters grinned at each other when they were lying there face to face, belted down in such a lewd manner. Simone then told them how their colonic will proceed.

Once the tub is filled with water and the Jacuzzi function is activated, the colonic irrigation begins. The water will slowly flow deep into their bowels, then would drain through the stopper so that their entire large intestine will be cleansed, Simone explained to Birgit. Initially, very small amounts of water would be pumped in until the colon is cleaned of solid residues, then the flow rate will be increased slowly. In between, there will be breaks, so that the water can drain out properly. The pressure of the water will be very closely monitored and carefully controlled. Simone pointed with her hand in the direction of the switch boxes. You will feel the flush as very pleasant and relaxing, she promised addressing Birgit.

Anita's colonic irrigation will be a little different, Simone then said. At the beginning Anita will be thoroughly rinsed too. After this initial cleansing, Anita's bowels will be filled again and the water pressure in her intestine will slowly be increased until, after a while, the water will be drained again. Thus Anita will be prepared for her enema treatments later on. Because of this Anita got a different stopper in which a valve for closing the drain is built in. Aha, Birgit thought, that’s why Anita's sphincter was gasketed. In addition, Anita's bladder will be cleansed, too.

The treatment will last 45 minutes. Have a nice time, Simone said and left the room.

The warm water wrapped the sisters up to the neck and the Jacuzzi feature was activated. At the thought of the now beginning cleansing, Birgit felt her lust in her pussy. She had hardly reclined her head on the padded headrest before she felt the water flowing into her gut. She closed her eyes and moaned softly and full of pleasure. Anita, who had been watching Birgit attentively, smiled to herself knowingly.

Despite the heat Birgit got goose bumps down her spine. Man, this is beautiful! she thought. Anal is fantastic! Never before in her young life Birgit was excited so deeply.

The colonic irrigation processed exactly as Simone had said. The water flowed slowly into Birgit and when she began to feel full, the inflow stopped and the water ran out again. After a few minutes, as Birgit's intestine was cleansed from coarse residues, the flow in her became more constant and finally as much water drained as was pumped into her. Birgit enjoyed this infinite flow inside her young body and relaxed more and more.

Her sister seemed to enjoy her cleaning too. Anita leaned her head back in the seat and smiled quietly. After about 20 minutes Anita began to breathe harder and Birgit opened her eyes. Her sister was breathing deeply now with closed eyes and a strained facial expression. Surely the pressure augmentation has been started, Birgit thought while watching her sister. Anita opened her mouth and deliberately breathed deeply. Watching Anita's facial expressions, Birgit could clearly determine that her strain was increasing. Then she shut her mouth again, but her breathing was still hard. After some time Anita relaxed. Aha, now the valve has opened and she is draining, Birgit thought.

She would have liked to see the assistant seated behind her and watch the displays, but she could not turn her head around far enough. After some time this game started again, Anita breathed harder, she grimaced and after a holding time she was drained again.

Little by little, sighs mingled with her with her breaths. Her enema pressure will certainly increase more and more, Birgit thought. Towards the end of the colonic, her sister's behavior had already become quite strong. Anita silted her eyes tightly, intermittently breathed fast in and out, short moans were heard and she moved her head slowly back and forth. The strain that Anita was subjected to was clearly visible now. After the 45 minutes both girls were drained and the water was pumped out of the tub.

Birgit was a little embarrassed as she smiled at Anita. Birgit would like to have asked Anita what she had just been put through, but she held herself off. Tonight, they would have enough time to talk about it, Birgit thought.

Assistant Simone appeared and unstrapped Birgit, while the other assistant took care about Anita.

Well, how did you like it asked Simone and Birgit said how stunning and erotic the treatment had been. She would never had thought that enemas could give so much pleasure. Anita smiled happily to herself as she heard her sister's answer.

Birgit should come with her, Simone said, as her a massage is scheduled, while Anita would be prepared for her enema training. Simone instructed her colleague: go ahead and strap Anita down onto the kneeling-rack, I will be right there, she finished. Aha, thought Birgit, Anita will probably get high enemas like she recently had downstairs in the clinic.

Simone led Birgit into a room with a leather upholstered massage couch on which lay a large towel. Simone told her to lay down on it, face down, and wait a moment. Another colleague will appear shortly and will spoil her a little. Simone pulled the colon tube of Birgit's gut and then left the room.

Not bad, Birgit thought, this is really a luxury program for me.

The assistant appeared, of course in the same latex outfit as the others. She welcomed Birgit and took off her latex gloves before she lubricated her hands with warm massage oil and trickled some of the oil onto Birgits back. Birgit relaxed noticeably under the practiced hands. After about fifteen minutes, the assistant told Birgit to turn around and she massaged her front. First, feet and legs, then the shoulders, arms and gently her belly. Gradually, the massage strokes got more soft and caressing and finally Birgit felt her hands on her small, firm breasts.

Birgit gladly let her continue and, due to the sensations that spread throughout her sexy body, she closed her eyes. Finally, the assistant was massaging the pubic area and Birgit willingly spread her legs apart. Then she heard the well-known hum of a vibrator and felt it on her labia immediately. She moaned out loudly as the assistant touched her clit. Slowly an orgasm was developing in her and as the assistant pressed the vibrator firmly on her clit, Birgit reared up and screamed out her feelings of pleasure.

The assistant asked Birgit if she had liked the massage. Birgit enthusiastically thanked her. You should remain lying a few minutes and relax, said the assistant. Simone will come in and pick you up. Still full of enjoyment, Birgit lounged on the couch.

She wondered if she would be led back to her sister. Birgit was very eager to find out what would be done to Anita. Surely she did not receive any relaxing massage and had most likely been flushed out on the kneeling-rack. Simone came in and told Birgit could now join her sister and watch her enema treatments.

She was led into a treatment room. The sight of her sister there made her gulp.



[b]Chapter 6: Enema Training[/b]

Anita was strapped to a kneeling-rack that had very little similarity with the one that was used downstairs.

At first view, Birgit could see the protruding and widespread ass of her sister. A thick enema tube with a large inflated balloon was fixed in her anus. Ah, she has a Bardex in her, Birgit thought once she had overcome the initial surprise. The other assistant stood near to Anita and watched the flow of the enema which drained from a large, now almost emptied bag, into Anita's receptive bowels. Birgit could hear deep breaths from Anita like in the hot-tub before. Simone led Birgit to a comfortable leather upholstered chair on the opposite wall. From there she could see her sister from behind and also see what the two assistants were doing.

For a start, Birgit examined the kneeling-rack her sister was strapped onto. Looks really high-tech, Birgit thought. This kneeling-rack was not a simple frame like downstairs but rather was placed on the floor on top of a thick column, which could be moved up and down. The support on which Anita was strapped consisted of several parts. Her legs were tied to supports that could be adjusted separately for lower leg and thigh. The base plates were made of stainless steel covered by latex padding. Anita's legs were buckled firmly with countless latex bands. The legs were bent at the knees and moved forward towards the body. In addition, the legs were spread wide so that the assistants had free access to Anita's asshole. Her upper body was lying on a plate that had cutouts for the breasts and Birgit could see Anita's stiff nipples peeking out below. Her chest was strapped with two wide latex belt onto the plate. Her arms were attached to supports corresponding to those of the legs.

In essence, she was lying on the rack like a jockey.

Several tight latex straps reliably prevented any movement. She lay with her forehead on an curved bracket that emerged from the chest plate and Anita looked down to the floor. Of course her head was also strapped with latex straps to this bracket so that Anita could not look over to Birgit. The whole of the chair, together with the defenseless Anita, was finally tilted forward by a ball joint at the upper end of the column.

Anita's belly hung down freely and Birgit's eyes widened when she saw that it already had a decent swelling from all the water sloshing in her. Finally, the enema was completely in her sister and the supply tube was removed, but the assistant left the Bardex tube in Anita's anus and said, you will keep these 4 liters in for 10 minutes before we go on. Anita was as quite as a mouse and just kept on breathing deeply.

4 liters? My goodness, thought Birgit, she really can tolerate quite a bit.

In the meantime the assistants cleaned the enema bag and various substances were poured into waiting pitchers, which were then mixed with large amounts of water. After about ten minutes Birgit thought that her sister would be unbuckled to empty herself. Instead, Simone pressed a button on the kneeling-rack and it moved, with Anita, to a vertical position; while her position on it remained unchanged. Now her bottom was the lowest part of the body. Simone put a big basin below Anita. Then she let the air out of the Bardex-balloon and pulled it out of her patient. Anita emptied herself with a mighty splash into the basin below. Again and again waves of water drained out of her ass until finally four liters of crystal clear liquid had flowed into the basin. Anita was tilted forward again and Simone rolled the container away. Meanwhile, her colleague had already prepared the next enema and rolled the IV-stand with the freshly filled four-liter bag next to Anita.

Anita's butt was cleaned and then lubricated again. This time a short thick enema nozzle was introduced into Anita and Simone explained that she will now let the water run into Anita's colon very fast so that it expands slightly and stretches. Simone's colleague pushed the bar of the stand with the bulging enema bag as far up as possible and then released the clamp on the hose. Anita moaned briefly as the water shot in her gut. Among sound of her soft sighs, the bag emptied quickly. Anita had her eyes closed and was breathing heavily with an open mouth as Birgit looked anxiously toward her. Simone left the enema in her for a short time before she moved Anita back to the vertical position and released the nozzle.

While Anita spasmodically emptied herself the assistants already prepared the next run. They mixed a white powder in a pitcher of water and stirred; the water immediately became white and fairly viscous.

The next enema will be administered very slowly into you, Simone explained to Anita. We have thickened the water, so you will feel it heavily inside your abdomen. This time you will have to take four and a half liters in your sweet ass, Simone said with a slightly sadistic tone in her voice. She took a syringe with a lubricant in her hand and squirted some into Anita's rectum.

Then she reintroduced the long, thick double balloon Bardex tube and connected it with the hose coming from the enema bag, which was hung much lower this time. The enema was started and this time Anita did not make a sound. Very slowly, the thick liquid drained into her. When the bag was about half empty Anita closed her eyes and breathed a little louder. Gradually her stress increase. and she sighed softly as her belly filled up more and began to inflate. Finally, she had taken the whole portion and the inlet tube was removed. This will remain now 15 minutes in your bowels, so you'll be stretched inside.

Birgit was a little queasy. They put Anita through the mill quite nicely. She had to recall what Anita and Dr. Lay had said to her last night and this morning. Birgit could hardly believe that her sister underwent these procedures voluntarily. But obviously Anita let the assistants do their work without any resistance to it. Birgit also noticed that some of Anita's moans sounded really lustful. Birgit started to see her sister in a different light and took a pride in her. Excitedly, she watched the treatment.

Once Anita had dropped the milky liquid out in several waves, she got two 3-liter-enemas to clean her gut out again. In fact, the first of the enemas was still mostly white.

Then Simone said to Anita that it will get a little bit harder now. Although the amount of fluid she will have to take now will be only two liters, this enema contains substances that would stimulate her intestinal tract and will developed a strong peristalsis. To prevent the enema from splashing out, I will lock your sphincter with the inflatable stopper. Simone inserted a short rectal tube that was attached to a stopper similar to that used in the Jacuzzi. As before Anita took the big plug without any fuss. The sealing tubes were inflated and Simone connected the intake tube to the stopper. Have fun, Simone said and started the enema.

The water drained quickly into Anita. Simone removed the intake tube and then sealed the connection in the stopper. Anita was still calm, she lay with her eyes closed on the frame, and was breathing quietly.

That's 20 minutes of retention, Simone said to Anita; who sighed deeply.

Birgit was extremely nervous. What would happen now? What will her sister have to suffer now? Will the cramps be severe?

Anita began to breathe heavily. First, sighs were heard and she screw up her eyes. With her open wide mouth, she moaned softly.

After a few more minutes, Anita's reactions became more violent as she writhed in her bonds.

Birgit gazed at her sister with open mouth. Anita's moans were now quite loud and Birgit was shocked at how Anita's abdomen contracted and relaxed under the bowel movements . She must be experiencing severe cramps! Birgit could not believe what was happening before her eyes. She shifted nervously back and forth in her chair. Slowly she got an inkling of what masochism meant.

Without ceasing, her sister moaned her suffering out loudly with wide open eyes and pulled at her bonds. The cramps came in waves over her and Anita breathed only intermittently. Birgit looked sorrowfully at her sister's apparently insane suffering.

After another endless 20 minutes had elapsed, Anita was allowed to drain; all the while still suffering from the severe cramps. The water literally exploded out of her. Even when she was back in the knee-elbow position, she was still breathing hard. Small beads of sweat clung to her forehead, which were dabbed away by the assistant.

Anita got some rest before the next enema was administered.

Now you will get a large herbal enema so that your bowels will relax again and will bulge out, Simone said to Anita as she filled another bag. Then she hung it to the IV-stand, while her colleague inserted a long colon tube into Anita and inflated the balloons. You'll like this one, Simone said to Anita and started the flow. She massaged Anita's abdominal wall and Anita really seemed to enjoy this, Birgit noticed.

As the herbal water was filled halfway into Anita, Simone took a vibrator and massaged her dripping wet pussy. It only took seconds before Anita had a strong orgasm - right in front of her sister - and writhed in her bonds like she did during her cramps.

Birgit was astounded about her sister's change from severe suffering to excessive lust and wondered if Anita had also had feelings of pleasure during her severe enema. Birgit made a mental note to ask her about her feelings that evening.

Maybe in her sister's mind, pleasure and pain lay very close together and Anita was able to mix these feelings up. In any case, Birgit needed to do some in-depth research about masochism.

After Anita's orgasmic waves subsided, she was told by Simone that the enema now will remain in her for half an hour. Turning to Birgit she said that it is almost one o’clock now and that a little snack is prepared for her.

She led the still very confused Birgit to a room that was apparently otherwise provided for the staff. Some purses lay on shelves and on a small kitchenette some food was prepared. Birgit was told she should help herself. Simone had to go back to Anita and prepare her for the treatments scheduled in the afternoon. Shortly thereafter, the assistant that had performed the massage on Birgit in the morning came inside and also got herself some food.

Anita will probably get nothing to eat, Birgit said to herself while thinking of her sister; who was still lying on the kneeling chair with a filled belly. Birgit could hardly believe what she just had seen.

The assistant smiled and engaged her in a harmless conversation while they ate.The conversation distracted Birgit from her bewilderment.



[b]Chapter 7: Elucidation for Birgit[/b]

After about three quarters of an hour, assistant Simone came back to pick up Birgit. Your sister is relaxing a little bit now from her treatments, she said to her. Maybe you also want a bit of variety, she asked with a mischievous smile. By now, Birgit had the desire for her own treatment. Watching her sister during her training had not only confused her but also made her pretty excited right from the beginning.

So she said, yes I would like that. Simone said that since she had liked her bladder cleansings so much, would she now like to give her one. So this news has already come up here in the upper floor, Birgit thought and turned red with embarrassment. Okay, she said to Simone and followed her into a treatment room where a gyno-chair was set up.

Truly luxurious treatments here at the clinic, Birgit thought. She was delighted with the courtesies that were chosen for her.

She quickly sat down in the chair and Simone strapped her in tight. Birgit was really horny at the thought of the coming bladder cleansing.

Her pussy got soaking wet, which Simone of course noticed immediately. Well, it seems you like it here, she said when she sat down between Birgit's widespread legs armed with a thin catheter. Birgit smiled sheepishly and admitted that she was very excited here. First, I'll let your urine drain, Simone said as she opened Birgit's vaginal lips and pushed the lubricated catheter into her urethra. Delighted, Birgit closed her eyes and leaned back. Her urine quickly ran out into a bowl attached to the chair. Simone pulled the catheter back out and said that she will stretch Birgit's urethra a little before she inserts the Foley catheter for her bladder cleansing.

Birgit was a little nervous but horny at the same time. What would get pushed into her, she wondered. Simone first picked up a small speculum and inserted the well-greased instrument carefully in Birgit's wet pussy. So I can get better access to your urethra, she said to Birgit smilingly as she turned the speculum open. She spread Birgit only to the extent that it was still enjoyable for her. Simone injected some sterile lubricant into Birgit's urethra and then got some sounds ready.

She showed one sound to Birgit and told her that she would stretch her urethra very carefully. Birgit became curious and her tension ceased as she saw that the sound was only slightly thicker than the catheter which had just been put in her. She closed her eyes and devotedly gave herself in to the feelings. Birgit felt really horny! Simone slowly pushed deeper and deeper until Birgit felt her bladder sphincter widen. It was just lovely!

Simone pulled out the first sound and took the next size and Birgit's feelings of arousal were only intensified. When Simone shoved the sound back and forth in her, Birgit was just short of a climax with every move. Simone, who noticed her lust smiled knowingly to herself as she brought Birgit again and again close to an orgasm. The next larger sound was just right for Birgit; it brought her horny feelings slowly to the edge of madness.

Simone pulled this third sound out of Birgit and asked her if she would like to try an even thicker one. As horny as Birgit was, she would have said yes to anything, if only she could finally come. She could not move her arms, otherwise she would already have gotten herself off with a quick reach to her clit. Yes please, she breathed in high excitement, and closed her eyes. Simone took a pretty thick sound in hand and pushed it slowly and carefully into Birgit's urethra. Birgit groaned loudly, because now she felt the stretch of her urethra quite intensely. Despite the somewhat painful sensation her lust did not decrease, but was stimulated even more!

As Simone slowly penetrated her with the sound and finally pierced Birgit's bladder sphincter again, Birgit almost overflowed with lust, moaning please go faster! Faster! Simone smiled and did her a favor. Another few seconds and Birgit was literally torn by a huge orgasm. She moaned loudly and tugged at her bonds as her excitement that had built up throughout the morning in her subconsciously finally found release. Simone held her at this level of orgasm for almost a minute before Birgit was quiet again. Finally, Simone pulled the sound out of her.

Now you're beautifully relaxed for your cleansing, said Simone. This time Birgit was no longer embarrassed but gave Simone a radiant smile.

Then, Simone took a fairly thick Foley catheter from the instrument trolley standing beside her. This is the same size that we used this morning on your sister, Simone said as the catheter was slipped into Birgit's urethra. Birgit opened her eyes and looked down at herself while Simone pushed the red 9 mm catheter further into her. Birgit was flabbergasted. This morning, the catheter had appeared exceedingly huge to her eyes; and now she took it herself without any discomfort? This feels really, really hot she admitted to herself.

Simone said she had watched Birgit during the pre-treatment of her sister this morning and had noticed her anxious gazes and her strong nervousness. Therefore, she wanted to give her an idea of the feelings Anita had felt during her treatments. Just like Birgit a few moments ago, Anita also had been torn between pain and pleasure and had been turned on even more through the pain she felt. This afternoon, Anita's training would not get easier and it would help Birgit understand if she experiences at least some of the sensations existing inside a real masochist; and that she had no reason to be anxious about her sister and would be able to witness Anita's treatments and be more relaxed.

Birgit started to understand a little more of her sisters urges.

She thanked Simone for this great explanation and told her that it had really helped her. This morning, it was indeed too much for her and she had been really worried about her sister.

Simone then attached the first syringe to Birgit's catheter and began to slowly fill her. Birgit got horny in a second and leaned back to enjoy the sensation. Simone injected two syringes of 250ml each in Birgit's bladder. Birgit was hooked on the feelings of pressure in her sensitive organ.

Simone left the liquid in her for a few minutes, then undid the clasp and let the water drained out of Birgit. These feelings are overwhelming, Birgit thought. Not as intense as with the sounds, but inside her mind she felt a wonderful, deep excitement.

Simone asked if she still wanted a 2nd filling and Birgit happily agreed. Simone took more syringes from trolley and filled Birgit's bladder again. After two injections, she did not stop but continued the injection with a third syringe. Birgit opened her eyes and saw another full syringe between her legs . She leaned backwards with a lust filled moan and gave Simone a sign of agreement. Simone slowly pushed the plunger into the syringe and more water flowed into Birgit's bladder. She breathed in and out deeply and moved her head slowly back and forth. Simone looked at her and saw that Birgit was overwhelmed by her feelings of great pleasure.

She pressed further as Birgit's breath got more violent and only stopped when she saw clear signs of discomfort on Birgit's face. At that point, Birgit had taken 650ml in her bladder. Birgit now existed only in a universe full of desire. The pressure in her bladder was simultaneously unbearable and yet totally amazing. She noticed how her pussy almost dripped with moisture. Now she could better understand her sister's feelings and was surprised at how well the hospital staff could empathize with their patients.

Simone let Birgit enjoy her filled bladder for a few minutes and then undid the clasp.

After she was drained, Simone untied Birgit and said that Anita was now prepared for her the afternoon's trainings and that Birgit could watch her treatments again.


[b]Chapter 8: Pressurized[/b]

Birgit was taken into a treatment room where her sister was strapped down to a gynecological chair.

This gyno-chair was designed similar to the kneeling-rack. The chair-like rest on which Anita was shackled was also attached with a ball joint to a height-adjustable column and was tilted forward so that Anita was sitting upright in the chair. The sisters looked at each other briefly; both smiled at the other, a little embarrassed.

Then, the assistant tilted the chair backwards until Anita's body was almost parallel to the white-tiled floor.

Simone led Birgit to the chair on which she had been sitting that morning and was able to observe both Anita and the assistants during the treatments. This time, however, she herself was also strapped with a waist belt to her chair by Simone. Birgit's somewhat uneasy feelings came back immediately. What would happen now, if even she was strapped? Birgit looked at her sister, who waited composedly with closed eyes for her treatments.

Anita's legs were secured with latex belts in large stirrups that also supported a part of the upper and lower leg. Her feet were fixed in special holders, as in the chair this morning. Her upper body was lying on a padded rest and was lashed down under and above her small breasts with wide straps. Her arms were secured with smaller belts next to her on the plate. Her head was lying in a molded recess of the backrest and was fixed with a strap over her forehead. Then the assistant spread Anita's legs and adjusted the stirrups upwards so that Anita's butt was easily accessible. Simone took a Foley catheter and inserted it into Anita's urethra. Birgit smiled, because it was exactly the same catheter that had just been put into herself.

Your sister will get some bladder cleansings too, said Simone to Birgit, smiling diabolically. Birgit could imagine that Anita's bladder cleansings would certainly not run as smoothly as hers and was curiously excited.

Simone lubricated Anita's ass and massaged the lube in for a long one. When she pushed into the anus with her fingers, Anita moaned with lust. Finally, Simone took another syringe with lube and squeezed a good amount in Anita's rectum. The other assistant fetched a white box on rollers to the side of the gyno-chair and dragged some hoses with it that were connected to the wall and ended up in the box. When the box was in position Birgit could see its front side. It looked pretty much like the control boxes at the Jacuzzi. Valves, pressure gauges and other buttons were attached. Birgit knew what was about to happen with Anita: she would get pressure enemas like this morning; and certainly much stronger than in the hot tub. Despite her earlier experiences, Birgit was very nervous and had to force herself to recall what she had been told: to calm down.

The door opened and Dr. Lay came in. Birgit's eyes widened because Dr. Lay had changed. Now she was dressed completely in latex, but unlike the assistant she wore a very sexy black cat suit which reached up to her neck. She was wearing the high-heeled boots that Birgit had noticed on her this morning. She could see that they were firmly laced and reached up to her knees. Around her waist she wore a tight-fitting black corset which matched the boots. Birgit gulped. Dr. Lay looked ultra sexy and yet frightening at the same time. She had seen a similar outfit in a TV documentary about a dungeon some time ago. At that time she had only smiled about it; but now, at the sight of Dr. Lay, she was in awe.

Dr. Lay greeted her briefly and asked how her day was like so far. She thanked Dr. Lay and said that he liked her treatments quite a bit. This pleases me, but now I will treat your sister, Dr. Lay said to Birgit.

She turned to Anita, who was totally at her mercy, and said to her: now your colon is perfectly prepared, I will continue with your capacity training. I see you've already got the bladder catheter, so all we're missing is the double-ridge stopper. Well, let's get your anus dilated a little bit so that the stopper will fit in your sweet little ass. Simone handed Dr. Lay a three prong anal speculum that was deeply inserted into Anita's anus. Anita took a audible breath and closed her eyes. Birgit stared in awe at Anita's anus as Dr. Lay slowly opened the speculum. Step by step, she opened the speculum more and more until Anita breathed sharply and her anus had opened up to 5cm. Dr. Lay turned the screw back a little, waited a moment and then them turned open again until Anita gave significant pain sounds. The process was repeated multiple times as Anita was being stretched more and more. Birgit stared wide-eyed at her sister during the entire process.

Her pliable asshole was now stretched to over 6cm in diameter. Gee, thought Birgit, that's for sure far enough. The high-pressure colon tube, please, Dr. Lay said to Simone. Simone handed her the thick, well-greased tube. Birgit now saw the stopper in Simone's hand and she realized why Anita had been stretched so wide. This stopper was much larger than the one that had been used this morning! With some effort, Dr. Lay pushed the thick tube deeper and deeper into Anita's body; which was supported by the assistant with an abdominal massage. Nevertheless, Anita moaned from time to time, especially as the tube passed her intestinal loops. Finally, with the tube in up to the plug, Dr. Lay removed the speculum from Anita's wide-open anus. With some firm pressure, the large plug sunk into Anita. She took this sizable plug with pleasurable moans.

Simone handed Dr. Lay a small syringe which she used to inflated the plug so the two sealing tubes of the stopper tightly blocked Anita's anal opening properly. She said sarcastically to Anita: sweetie, now you are fully sealed and not a drop will accidentally escape. Then she picked up three hoses that hung on the side of the colonic machine on a hook, and jointed them with the hoses that were coming out of Anita. Two stiff, thin ones for colon tube and bladder catheter, a fairly thick but very flexible one that she screwed into Anita's stopper. This is certainly the drain pipe, Birgit thought.

When Dr. Lay turned the machine on, which woke up with a short buzz, Birgit got quite nervous. She took hold at the armrests firmly to ease her stress but otherwise did not make a sound as you Dr. Lay had commanded this morning. Well Anita, said Dr. Lay, let's see how well you're able to expand. At first ill fill you up slowly, so you get used to the pressure a bit before we really start.

Dr. Lay turned a valve and the water began to flow into Anita. Anita laid on the chair - her head fixed - with a serious expression and looked to the ceiling. Yet she showed no reaction. Birgit looked at her sister and then she looked at the flushing device.

The pointer of a large pressure gauge had moved slightly. This is certainly the inlet pressure, Birgit thought. Beside it a digital display was running. She looked at it and saw this display indicated the amount of fluid that has been pumped into Anita. This Birgit found very interesting. So I always know how much water my sister has to endure in her body, she thought. The display now showed about 400cc. These indicators existed twice, the other one will be for the bladder irrigations suspected Birgit.

Slowly, more and more water ran into her sister. One liter, two liters, Anita finally took three liters without difficulty. When the display had climbed to almost 3500ccm Anita took deep breaths. She now had her eyes closed and seemed to enjoy her filling.

At 4000cc, a first sigh was heard from Anita as her stomach bulged noticeably. Dr. Lay slowed the flow down with the control valve. The pressure gauge had also increased slightly, she is getting full, thought Birgit. Slowly, the amount of water increased. At 4500ccm Anita showed clear signs of stress. However, Dr. Lay let the water continue to run into her. Anita began to sigh heavier and moved her hands back and forth. 5000cc she had in her now and Birgit looked intently on with her mouth open. 5 liters! That is hard to believe she thought in disbelief. And that's just the beginning! How much can Anita endure? she wondered. Anita was breathing in short gasps now and sighed. Dr. Lay turned off the inflow and said, for your first time this should quite suffice. Anita relaxed slightly as the flow was stopped and seemed to exist in a mixture of lust and pain.

Birgit could clearly see that Anita's nipples were hard and her pussy was very wet. After five minutes retention time, Dr. Lay pressed a button and the machine pumped the water out of Anita. Then she filled Anita again, as before she went to 5 liters, but this time she let the water flow in faster. Anita again seemed to switch between pleasure and pain. A third time she was been filled, said Dr. Lay that her intestines are now prepared enough for the upcoming capacity training and she will test her bladder.

Dr. Lay operated the other controls and the gauges began to work. Of course, the water flowed much slower in Anita's bladder, but 500cc was reached soon. Anita enjoyed this filling, no doubt, because a slight smile played on her lips.

At 600cc, she closed her eyes and breathed in concentration. 700cc. 800cc she took in her body without Birgit could seeing that it was difficult to her. Finally, at 900ccm Anita tensed up slightly and breathed with open mouth. 1000cc was pumped into Anita's bladder and now she showed strong reactions. She was breathing heavily and groaned under the pressure that had built up in her. At 1100cc she began to move in her bonds and cramped up. Dr. Lay turned off the pump and said that wasn't bad for a start, Anita. This promises to become an interesting afternoon.

Birgit swallowed. Dr. Lays praise sounded more threatening than encouraging; certainly due to her strict appearance.

Anita's bladder was, like her bowels, filled with three times. The flow was also regulated faster and faster as before. Anita seemed to get used to the pressure during the third time, as she remained pretty quiet. Dr. Lay left her bladder filled for 10 minutes while she examined Anita and palpated her. When Dr. Lay bent herself over Anita's head they smiled at each other.

Dr. Lay again took her place between Anita's legs. Well Anita, then let's start with your training. I'm going to pump water back into your gut until you're completely full and the pressure rises slightly. Then I will increase the pressure in you some more and then I will turn on the automatic irrigation. As you know, the pressure is automatically held at a preset, constant level and water is refilled, if your gut widens and the pressure in your bowels drops. You know how that feels, Dr. Lay said.

Birgit was sure that Dr. Lay mainly did these explanations because of her.
Aha, that’s how it works, Birgit thought. This is really a diabolically thought-out machine. Dr. Lay presets a pressure, then sits back with pleasure and watches the suffering of her patients.

Dr. Lay grabbed the controls and water flowed into Anita's intestines. She regulated the flow rate quite high up to five liters, then she slowed the inflow down and looked at the pressure gauge. Anita moaned softly to herself, breathing heavier and heavier. 5300ccm showed on the display, and Anita began to suffer heavily from the filling pressure. When Anita was up to 5500ccm she tugged violently at her bonds and moaned loudly. First oooohs and aaaaahs mingled with her sounds as finally 5600ccm were pumped into her.

Birgit looked breathless on the scene. The two assistants now massaged Anita's swollen abdomen, so that the water could be better distributed inside her intestines. Birgit saw that the pressure was slowly increasing. Dr. Lay ceased the inflow and the pressure gauge stopped, but Anita was still breathing heavily. Slowly, her moans became more subdued. Thick beads of sweat stood on her forehead. Simone took a damp cloth and wipe gently over Anita's face; apparently, this did not even register with Anita, Birgit observed. She seemed now in a Nirvana of pleasure and pain, and forgot about everything around her. Birgit calmed down a bit when she saw the clearly lust filled state of her sister; she was apparently accustomed to the immense amount of fluid in her belly.

As Anita breathing got quiet again, Dr. Lay turned, just as she had previously announced, the inflow slowly on and the pressure in Anita continued to increase. 5700ccm was announced by the quantity display. Anita began to moan harder again and moved her hands. Very slowly, the pressure rose up inside her. 5800ccm had arrived and Dr. Lay manually stopped the inflow . Severe sounds of distress were heard from Anita and Dr. Lay turned on the device to automatic mode for 30 minutes of training.

Anita calmed down slowly. Birgit could not help but to admit to herself that not only was Anita aroused by this pressure filling, but that she got ultimately horny herself just from watching what was happening.

Dr. Lay stood next to Anita for a moment and observed her patient, who lay in her bonds with closed eyes, and then she turned to leave the room.

Simone and her colleague took care of the suffering Anita. Birgit watched the pressure gauge and after about 10 minutes it was visibly declining. The pump turned on and filled Anita slowly again until pressure that Dr. Lay had set was reached. Anita was breathing harder as she felt the pressure increase in herself, but groaned not as violently as before. Now the amount had climbed to 5950ccm. My goodness thought Birgit. Six liters she has inside herself, pour you! And I already feel totally full at little over two liters she thought. She is really well trained, Birgit had to acknowledge.

The pressure was readjusted twice and when the half hour was elapsed the Volume display showed 6130cc.

After exactly 30 minutes, Dr. Lay was back to drain Anita. She sat down on her chair and operated the drain valve.

Anita took a deep breath. Now your bladder is on deck, said Dr. Lay. When all the water from Anita's gut was pumped out, she opened the valve for the bladder catheter. The display began to run. Anita was still motionless again up to almost 1000cc, then she began to get restless and her first sighs were heard. Dr. Lay slowed the inflow down somewhat. 1100cc were now inside Anita and there were clear signs of discomfort from her.

Dr. Lay let the water flow in slowly. Anita's moans were finally heard after 1150cc had been pumped into her bladder; the pressure indicator was clearly moving upwards. Dr. Lay turned off the water and let Anita calm down a little. Then she started the flow again and Anita let out a long-drawn moaning. Her eyes were widened and she clenched in her bonds.

Dr. Lay had no mercy with Anita. It was not until Birgit could see the pressure indicator had raised upwards a lot more that Dr. Lay stopped the inflow and again started the automatic control. Anita moaned incessantly now; writhing in her bonds as far as they would allow. Again the assistants dabbed the sweat from her forehead. However, just like during her bowel training before, Anita calmed noticeably and slipped into a similar deep state of pleasure.

Dr. Lay left the room again and Anita had to endure the pressure filling of her bladder for half an hour. From time to time the pump hummed again, while Anita endured with deep sighs.

30 minutes later, Dr. Lay emptied Anita's bladder. The quantity indicator finally stood at 1210cc.

Well, you've certainly accustomed yourself again to the pressure fillings in the last hour, so we can now kick this into full gear. Birgit got pale. What, even more pressure? How can she tolerate that? she asked herself, and could hardly believe her ears.

We will start with your guts, Dr. Lay said, and began Anita's next filling. Anita was quiet in her chair. Only a serious facial expression showed that she knew exactly what was in store for her now.

Again, Dr. Lay pumped Anita up to five liters rather quickly before she slightly reduced the water flow. 5.5 liters, eventually 6 liters were pumped into Anita before Dr. Lay paused the flow for the first time. Anita sighed very heavily and moved restlessly. Her stomach had become like a little ball, Birgit noticed with amazement. Dr. Lay waited until Anita calmed down somewhat and then opened the valve again. 6200cc were in her as the pointer of the pressure gauge slowly began to move upwards. Dr. Lay stopped again as Anita moaned violently and wailed slightly. Dr. Lay interrupted the filling just for a few seconds, then she increased the pressure again.

There was sweat all over Anita's stressed body. Her stomach bulged out more and more. Her moans became louder and louder. But Dr. Lay went on unaffected. The pressure rose slowly more and more. Anita stared wide-eyed at the ceiling. OOOOAAAAAHHHH ... my ... gooodd… she groaned. Birgit held her breath. She too had dragged herself into her bonds. Just a little bit more, said Dr. Lay and turned the valve on again. The pressure rose still a significant amount and Anita whined loudly. Dr. Lay regulated the inflow off and finally switched to automatic mode.

Birgit now breathed intermittently too and watched her sister, who was violently moaning and her cramped hands turned and twisted. It wasn't until long minutes that Anita relaxed and got noticeably quieter. Birgit then looked at the display and took a deep breath. 6650cc stood there. Incredible! How can Anita stand this? Totally crazy! And if she was honest with herself, she had to admit this was also incredibly hot!

Dr. Lay finally addressed Birgit and said that Anita will now remain filled for an hour. While her sister enjoys her training, Simone would take care of her for a while if Birgit would like. Birgit looked at Anita who had now actually calmed down and lay on the gyno-chair with short and regular breaths.

Birgit dithered a bit. Should she leave her sister alone now?

However, she normally endured her trainings alone, and Anita seemed to be on a different planet in her mental state; somewhere between lust and suffering.

[dunhill]

[b]Chapter 9: Birgit emulates her sister[/b]

Finally Birgit said to Dr. Lay, thank you, I would like that. Simone, please take care of our young patient, Dr. Lay said as she went out the treatment room.

Simone unbuckled Birgit and led her out of the room.

In the hall she asked Birgit about her preferences. Would you maybe like to be anally penetrated so that you can begin with real anal sex soon? Or perhaps a little bit of anal dilation sounds preferable? Aha, thought Birgit. Sure, Dr. Lay has had read my medical records from downstairs.

But Birgit lusted much more after a high enema. She wanted to emulate at least a little bit of her sister. As extreme as Anita she would certainly never become, but she wanted to have at least a guess at Anita's feelings.

Can I get a high colonic too, she asked Simone. Sure, she said, come with me. To Birgit's great joy, she went to the room used that morning, where the pretreatment of her sister had taken place. Slowly her excitement crawled back up and she got goose bumps. The very thought of being strapped down on the kneeling-rack like her big sister drove Birgit mad. Although, she certainly was not as masochistic as her big sister, she found bondage highly arousing. After she had overcame the initial shock, Birgit liked this kneeling-rack better and better. Simone felt Birgit's excitement and smiled to herself.

She asked Birgit to kneel down and adjusted the leg supports. Then Birgit leaned forward and Simone adjusted the chest plate so that her breasts fit exactly into the openings. The headrest and the armrests were set too and Simone began to strap Birgit down. Her lust knew no limits as she felt the many bonds on her skin; her pussy was almost over running with hot juice. Finally, Simone pressed the adjusting mechanism, and shortly thereafter Birgit was in the same position on the rack as her sister before.

Simone said that she would now administer a small cleansing enema before she used the long intestinal tube. Simone filled an enema bag with a liter of warm water and hung it on the waiting stand. She lubricated Birgit's sphincter with some lube and massaged it gently. Then she pushed the short nozzle into Birgit and started the enema. Birgit moaned in pleasure as she felt the warm flow of water in her. After a few minutes Birgit had taken the enema and Simone said that she should keep it in for five minutes of retention time.

Birgit closed her eyes and enjoyed her wonderful feelings of pleasure.

Then she was moved to the vertical position and allowed to drain. This felt awesome too, Birgit found. She was tilted forward again. Simone re-lubricated her anus, and then she began to insert the long intestinal tube.

Finally, the Bardex balloons slipped into her ass and Simone pumped them up fully. With a red face and lowering her voice Birgit asked Simone if she could get a stretching enema with the white, thick liquid, like her sister got that morning. Simone had to stifle a grin and said mischievously to Birgit: well you got pretty horny this morning! Sure you can have this special enema, if you like. Birgit heard Simone fiddling with various containers and she finally heard water run.

Ok, Simone said, the mixture is ready. I will now start your stretching enema. It takes a while until the bag has drained into you, until then I massage you a little so that the liquid will be well distributed within your stomach. Simone gently massaged Birgit's abdomen as the special enema flowed into it. Birgit clearly noticed the difference. The liquid was moving into her intestines slower than usual, and just like Simone had explained that morning, she felt it much more intense than any other enema before. In her super hot status Birgit could not get enough of this slow flow in her intestines.

Simone's massage was very efficient and she felt her guts slowly filling up to every last corner. The pressure in her grew more and more, but she didn't want to say stop until she really could endure no longer. Just when she thought she could no longer stand it, the bag was empty. Birgit groaned under her feelings and enjoyed the incredible fullness within her. You've received a full three liters by the way, Simone whispered softly in her ear. Birgit was amazed. I have 3 liters inside of me? She closed her eyes, and now her lust shot into her brain. She thought of Anita and was proud that she had emulated her; at least a little bit. Simone began massaging her soaking pussy and it was not long until Birgit imploded under a never-ending orgasm and moaned her lust out loud.

Simone moved Birgit into a vertical position. While Birgit emptied herself in waves, she prepared the two 2-liter cleansing enemas to thoroughly clean the white residue out of Birgit's intestines.

Finally, she unbuckled Birgit and said that her sister would now be ready for further training.


[b]Chapter 10: Pressurized Part 2[/b]

They went back into the treatment room were Anita lay with closed eyes on the chair and, to Birgit's astonishment, she looked quite relaxed. Apparently she was still in her highly excited state.

Birgit was strapped to her chair again and she looked at Anita. Her belly had even become slightly thicker and when she looked at the display she knew why. Incredibly, Anita now had 7100ccm inside her! Birgit could hardly believe it. More than seven liters! What the hell could her sister stand? Insane, she thought.

Shortly thereafter, Dr. Lay came in and examined Anita. She checked her pulse. When Anita opened her eyes Dr. Lay asked her if she wanted to be emptied one more time before her two-way filling began or if she can continue directly?

Birgit's blood run cold. That could only mean that Anita's bladder would be filled! Oh my God! To what other treatments will my sister expose herself to before she gives up? She knew what she had to endure during the treatments and had even desired them, as Anita had told her yesterday. Birgit hung on her sisters lips as Anita heaved a sigh and said: Please start the additional bladder filling immediately, Doctor.

Okay, said Dr. Lay and quickly sat down at the controls. She grabbed the valve for the bladder and turned it open slowly. Mhhmmmm Anita moaned. Unbelievable, thought Birgit, she really seems to enjoy it. Slowly, Anita's bladder filled in addition to her already overfull bowels. She took short breaths. By and by, sighs came from her mouth as she had taken a little over 900cc. Her breath began to quicken again and she began to moan softly when the amount on display was 1100cc. Dr. Lay did not yet stop the flow. Anita's reactions were quite severe now, but still the pressure gauge had barely moved. Birgit knew that Dr. Lay would stop only when a distinct peak could be seen on it. The amount of fluid in Anita's bladder continued to increase. First, drops of sweat formed on her forehead and she clenched her hands to the handgrips. At 1300cc the pointer of the pressure gauge moved upwards noticeably and Dr. Lay slowed down the feed stream. Anita moaned, this time certainly not from pleasure. Dr. Lay kept the pressure unchanged for 2 minutes, then she increased it a little further. OOOOAHHHH Anita moaned loudly as her bladder was stretched even more; 1420ccm showed the gauge now. Anita now looked as she was in a trance.

Dr. Lay let Anita rest for five minutes, then she announced that she'll start the pressure increase now.

Are you ready Anita? she asked loudly.

Anita sighed and whispered: yes, I'm ready. She took a deep breath and then she demanded loud and clear: please boost the pressure as high as possible. Birgit almost fell out of her chair. Please, what had her sister just requested? As high as possible? Birgit was shocked. In contrast Dr. Lay and the assistant smiled at each other.

Dr. Lay started the pressure increases in Anita's intestine. Anita sighed out loudly. The display started to run again but it took a bit before the pressure pointer began to move too. Anita seemed to have put herself into a trance-like state and completely forgot about the outside world.

She moaned and sighed out loud, but also groans of lust mingled among them. Dr. Lay turned the valve open a bit more and the pressure increased gradually.

Birgit stared at the gauges. The amount had climbed to 7300cc. Then, Dr. Lay stopped the increase in the intestine and took the bladder controller handle.

Again, she opened the valve quite far and Anita yelped out loudly. Oaaaaahhhhhh she pressed out under her cramp-like breaths.

On and on the amount of fluid in her bladder increased. Anita took 1500cc, 1550, finally 1600cc was in her bladder as Dr. Lay closed the valve. Anita moaned now without ceasing, and she was covered in sweat. She had her eyes shut tight again and apparently suffered from the insane pressure inside her body. Dr. Lay waited a few seconds until Anita's moans got a little quieter. Then she reached again for the bladder control.

Birgit again held her breath. Dr. Lay turned the valve open dauntlessly; more liquid expanded Anita's bladder. The pressure gauge was moving faster now. Surely she cannot expand her bladder anymore, Birgit thought. 1650cc, finally 1700cc had been pressed in the defenseless Anita as Dr. Lay stopped the inflow and immediately picked up the bowel valve. Anita's reactions were not as severe as before, so Dr. Lay continued. Birgit only marveled.

Anita sighed briefly as she felt the new pressure buildup in her intestines. Then she moaned and continued with many aaaahhhs and oooachhs. Anita's intestinal pressure increased slowly and when she had taken 7500cc Dr. Lay stopped the increases for a quarter of an hour. Anita sighed aloud, and actually seemed to feel some pleasure.

Anita was moaning softly again, and finally she lay with closed eyes in silence, only her short breaths were clearly audible. Dr. Lay examined Anita again and then asked her if she was ready to bear the full pressure now. Yeah, Anita moaned, shaken from absolute lust. Birgit felt herself getting hot. Her sister appeared special like never before to her. At that moment, she even felt some pride for her.

Dr. Lay sat down again at the controls and this time she opened both valves at the same time. Very, very slowly more water was pumped into Anita. Dr. Lay stood up to watch Anita up close. The movement of the pressure gauge was hardly noticeable. After a quarter of an hour Birgit saw that they had moved further just a bit.

Dr. Lay let the water continue to flow into Anita. Finally she opened the valves a little more. Anita cried out her suffering and her lust. On and on the pointer walked up the scale. As she penetrated into the orange area Dr. Lay throttled the inflow, but did not turned it off. The middle of the orange field in the gauge was reached. This huge pressure increase lasted almost half an hour. Birgit was trembling with excitement when she saw the quantities Anita had to endure. 7900cc in her intestine and 1900cc in her bladder. Madness!

Simone took a Hitachi vibrator in hand. Simone's colleague tenderly massaged Anita's belly and her sopping wet pubic area, then Simone put the super powerful vibrator on Anita's pussy. Highly agitated Anita yelped. She tugged at her bonds and apparently reached highest regions of lust. Dr. Lay watched her for a moment, then reached back to the pressure valves and opened them wider again. Anita nearly passed out due to the sensations.

The pressure insider her increased again and at the same time her orgasmic contractions got stronger. Simone and Dr. Lay continued this game for a few minutes, the pressure levels approached the red zone.

Dr. Lay opened the valves a little more still. The defenseless Anita answered with loud cries and sharp breaths. Finally, the red marks in the gauges were reached and Anita now endured 8100cc in her gut and 2050cc in her bladder.

Like an expectant mother she lay in her straps. Dr. Lay nodded to Simone and she turned the vibrator on its highest setting and pressed it directly onto Anita's clit. This was too much for her; Anita exploded in an enormous orgasm. Anita shrieked out her pent-up lust. Dr. Lay now opened the draining valves and Anita's reactions got even more violent. With the vibrator Simone held her on the highest peaks of pleasure for almost a minute, before Anita's orgiastic spasms subsided and she finally relaxed and panting laid in her bonds. Anita looked breathless and had a big grin on her face.


[b]Chapter 11: Relaxation[/b]

Well, how did you like that, Anita, asked Dr. Lay, and Anita thanked her exhaustedly.

So, said Dr. Lay, you two deserve a little relaxation. There's a bath scheduled in the hot tub before you will go home today. Tomorrow morning we will see you again she said, smilingly. She got up and walked out. Simone and her colleague removed the tubes from Anita and unstrapped her. Simone then led the two sisters to the bathroom and strapped them firmly into the Jacuzzi. Birgit and Anita grinned at each other happily. When the water had flowed in, Simone left the room and said that the sisters could relax for half an hour. The bubbling water smelled very pleasant this time; Simone had put a relaxing bath essence in. The two girls enjoyed the soothing warmth.

Anita asked Birgit if she had liked her day. Birgit did not know how she should to begin. After all, one “highlight” had come after the last, and thus even literally. She told Anita about her treatments and how much she had enjoyed them. In particular, she mentioned the elucidations she got from Simone, about the feelings of her sister and how she had helped her to better understand the severity of the treatments. Anita replied that she had been training herself for more than two years now and could therefore stand a lot.

After the bath, they went back home; Where Anita ate a good portion of her special food. As Birgit looked at a clock she was pretty surprised, because it was 9 o’clock. So they had spent more than 12 hours in the clinic. Then they went quickly to bed. The long, strenuous day had also made Birgit tired. But maybe Simone had helped along with the bath essences?


[b]Chapter 12: Second Day[/b]

On the next day, the two sisters went back early to the clinic and this time they got picked up by Simone who wore a long white coat over her latex dress when she came down to the basement.

Like yesterday, they were allowed to undress and were strapped on the opposite gyno-chairs to get their cleansing enemas administered.

As Birgit was tied to the chair she immediately felt her lust awaken and as Simone inserted the long colon tube into her for her colonic irrigation, Birgit asked her if she could also get a bladder cleansing this time, like her sister. All three other girls had to hide their grin when they heard Birgit's request. Sure, Simone said, and fetched the right accessories. Simone pre-expanded Birgit's urethra with two sounds before she inserted the same Foley catheter that was used on Anita.

Then the two girls were strapped into the hot-tub and the cleansings were started. It felt quite different to yesterday, Birgit thought. She sat back and enjoyed the enemas which certainly were not so hard as the ones her sister had to endure. Nevertheless, she felt very full and her lust rose steadily. Hopefully, I will get a massage the same as yesterday morning, she thought, and looked forward to her first orgasm of the day. Birgit was not disappointed. When the Jacuzzi was stopped and the water was drained from the tank and from the intestines of the two teenagers Simone came and released Birgit. She handed her a towel and asked her if she would like a massage as yesterday. Birgit could hardly hide her joy.

Simone's colleague will take care of Anita, who will be prepared for her upcoming treatments, Simone said.

After the massage, which was administered by the same assistant as yesterday, a satisfied and relaxed Birgit was led in the treatment room where her sister lived through her morning treatments.

Anita was strapped to the kneeling-rack and Birgit initially thought that she would get some high enemas again, but this time no enema equipment was to present. Instead of that, several specula, various dildos, plugs and a large pump bottle of lube was displayed on a supply cart.

Aha, Birgit thought, she will probably be stretched a little bit. Simone strapped Birgit onto the chair where she had sat yesterday with the waist belt.

The other assistant had already lubricated Anita's pink anus and was just massaging her sphincter. Simone took a speculum from the table and lubed it too.

Well, Anita, she said, after we have treated your insides properly yesterday, today it’s your sweet ass's turn to be stretched. Simone inserted the speculum all the way into Anita. She slowly turned its screw and Birgit saw that Anita's pussy glistened wet in horny anticipation.

Bit by bit Simone opened her sisters anus, while Anita knelt quietly and with closed eyes in her bonds. Simone turned the speculum open pretty wide; to Birgit's astonishment, Anita took this without any noticeable emotion. Simone opened the speculum several times and carefully expanded Anita's ass more and more. Simone then took another speculum, which was already lubed by her colleague. This was slightly larger than the first and as Simone turned it open slowly, some heavy breath could be heard from Anita. Slowly she feels herself stretching, Birgit thought. Even this large speculum was opened step by step. When Simone had it opened almost to the maximum, clear signs of discomfort could be observed from Anita. She moaned loudly and closed her eyes.

Simone finally pulled the speculum out of Anita's anus and picked up a pretty thick dildo, Birgit estimated that it had about 5.5cm in diameter. Simone fucked Anita with it slowly for some time to loosen her up as she explained. After a few minutes of slow penetration Simone moved on to a slightly thicker dildo.

With this one Simone continued Anita's fucking and then switched to a thinner, but very long dildo, Birgit guessed it to be about 40cm long. I will now attempt to penetrate deeper into your guts, Simone said. Anita's asshole was already slightly open from the previous penetrations and the thinner dildo slid into her without any resistance. Simone slowly pushed the dildo deeper and deeper into Anita. After about 20cm, the first resistance stopped the further insertion of the dildo and Simone began to move it slowly back and forth and twisted it. Centimeter by centimeter, she worked it further into Anita's intestines, which made her moan slightly. Simone finally overcame the intestinal loops and the dildo slid further and further into Anita's ass, which was stretched out provocatively. Birgit's eyes widened. After a few minutes, Simone had sunk the entire dildo in Anita and pulled it out until only the tip was left inside. Then the journey into the depths of Anita's pleasure center began again. This time, already significantly easier, Simone pushed the dildo's full length inside. She repeated until Anita could take the dildo with no resistance. Simone moved up to an equally long, but thicker dildo and repeated the procedure. Anita enjoyed this deep penetration, which Birgit could clearly detect. Anita took this dildo with ease too.

Now it is getting a little harder, Simone said as she reached to a considerably thicker and much more rigid dildo. This time she had to overcome significant resistance and Anita sighed and moaned loudly as Simone worked the long toy slowly deeper and deeper into Anita intestines with rotational movements. Even this dildo Anita finally choked in her sweet ass. After several minutes of gentle insertion and removal by Simone, Anita got more and more relaxed. She was enjoying this treatment, which could Birgit see by her glistening pussy.

Now I will stretch your gut a bit, Simone said, reaching to a third cock, which was thick again and this time super stiff. It hardly bent, as Simone grabbed it at the far end and put it at Anita's already gaping hole. Birgit was curious if her sister would tolerate even this giant prick. The dildo was approximately 5 to 6 cm in diameter and like the others 40cm long. Slowly the smooth, thick shaft slid into Anita's ass. She breathed in and out deeply, surely she knew that now it will be quite demanding to absorb that long, stiff dick. Simone nudged into Anita's intestines and said: push! Anita took a deep breath and pushed out with her hot little ass. Simone stuffed the dildo further into Anita. The resistance that Anita's intestines put up against the invader was clear to be seen. Only millimeter by millimeter Simone could work it in. Again and again she pulled the dildo back and pushed it forward into Anita. Birgit thought that her sister would not make it this time, but under her moans and sighs, Simone worked deeper and finally put this huge, stiff dildo completely in Anita's sweet ass.

Simone let Anita get some rest from the strain, before she pulled the dildo back out and a new journey began in Anita bowels. This time, things got easier, but still the dildo slid into Anita's intestine with some difficulty. After several attempts Anita also took this dildo without any problems into her nether hole and Simone fucked her vigorously while deep groans came out of Anita.

Anita's ass was gaping wide as Simone pulled the dildo completely out from her and now reached from a butt plug that one of her colleagues had already lubricated.

So now you'll endure a little stretching before I spoil you later, Simone said to Anita. Birgit approximated the plug that Simone pressed into Anita's anus was a good 6cm in diameter.

Simone stuffed the plug into Anita and after a short gasp Anita had took it. Well, we'll try a number greater, Simone said smiling. Birgit noticed with astonishment that she lubricated another plug that was 7cm in diameter . That this giant toy should fit into Anita's little ass? Incredible. Her sister is ready to endure a very extreme workout, Birgit thought. Simone pulled the first plug out of Anita effortlessly and put the thicker plug to her rosette. This also sunk quite deep into the ass of her sister, but after about ¾ of the cone significant resistance occurred. Anita sighed as Simone pushed the plug firmly into her butt. Well, this one you'll feel some more, said Simone and asked Anita to push again. Anita pushed with all her strength and Simone squeezed hard. Multiple times the two repeated the game and finally Anita's anus gave up to the pressure and with some moans of pain the plug was seated completely. Birgit had leaned forward in her chair and stared in bewilderment at her sister. Anita was breathing heavily, but Simone gave her a little time to rest before she pulled the plug out and pressed it into Anita again and again. She repeated this two dozen times before she said that Anita was now ready for her loosening exercise. Loosening exercise? Birgit thought. What would happen now?



[b]Chapter 13: The Sling[/b]

The assistant went out of the room and rolled in a strange frame from a secondary room. It consisted of thick, curved stainless steel tubes and looked like a big U laid on its side. From the upper tubes a thick leather board hung down attached to the frame with chains. Some restraints were attached to the chains. Birgit wondered for what this would be, something she had never seen before.

Only when Simone had untied Anita and asked her to climb into the sling did she realize what the leather board was for. Anita went to the rack, turned her back to the sling, as Simone called this device, and reached back for the chains. She drew herself up with her arms and sat on the stiff leather board that yielded a little from her weight. She leaned back and Simone helped her into the right position.

Anita's legs and arms were exactly at the joints of the chains and Simone and the assistant strapped Anita tightly in place. Her arms and legs were stretched out upward, so that she was virtually hanging down in the sling. Her round butt sticking out somewhat from the front of the leather board; the board also provided rest for the head. Anita's legs were spread slightly and her still gaping asshole was easily accessible.

Well, let's get your sweet horny ass loosened up a little, so that its ready for this afternoon, Simone said while she put on some elbow-long transparent latex gloves which enclosed her hands and forearms like a second skin.

Aha, thought Birgit, this afternoon is going even further with the anal treatments. Dr. Lay will probably come back to treat Anita and it will get very violent like yesterday. With mixed feelings Birgit waited. What Simone was up to with her sister?

Simone's colleague took a large amount of lubricant and lubricated Simone's right arm. It began to dawn on Birgit what was about to happen. She gasped. That cannot be! Simone wants to insert her whole hand into my sister? But she remembered the huge plug Anita had just swallowed and that one was certainly as thick as Simone's hand.

And that’s to Anita's liking? A nice prick, that’s what Birgit was eager to take in her behind, but a whole hand? Birgit was a little confused. She thought back to yesterday's talks with Anita and Dr. Lay where it was made clear that this all happened voluntarily and Anita wished her treatments to be that way. Maybe it was the stretching pain that drove her over the edge, thought Birgit, because she could not believe that such an extreme stretching would be possible without an significant amount of pain.

Mesmerized, she looked at Simone as she lubed Anita's anus and massaged it with her hand. She pushed two fingers into Anita; she was greeted with clear moans of pleasure. If she was honest with herself, she could see clear signs of strong excitement from her sister. Her pussy was now soaking wet. As Anita had been in the sling before, her excitement and anticipation were strongly visible.

Simone had four fingers in Anita's ass and fucked her slowly. Anita, full of pleasure, closed her eyes and moaned. Then Birgit's idea began to become a reality, Simone put her thumb into her palm and pressed harder into Anita's butt hole. Piece by piece of Simone's hand disappeared into Anita as she repeatedly pushed in up to the middle of her hand. Then she said: push! and as Anita closed her eyes and pushed, Simone pushed her hand, in a swift movement, completely up Anita's horny butt. Anita moaned loudly and Birgit's jaw almost hit the floor when she saw Simone's hand had completely disappeared into her sister up to the wrist. Gee! she thought. But just like yesterday, she was not rejected but a part of her subconscious found the sight very erotic.

Simone moved her hand now slowly back and forth in Anita's rectum. She moved out again so that Anita's sphincter extended provocatively and arched outward. Anita moaned louder and louder, it seemed that she was experiencing lots of pleasure. Finally, Simone pulled her hand back out completely and pressed it right back into Anita with a quick single push. Mhhhmmmmyeeessssss came from Anita.

Simone repeat this game several times, massaging Anita from the inside and brining her to fierce convulsions of desire. After a while of Simone fisting her really hard, Anita's anus was again wide opened and Simone's hand slid into it without resistance. Simone then slowly began to penetrate deeper into Anita.

Far above the wrist sank her fist and it went on and on. Simone apparently sought a way through Anita's intestinal loops, as she moved her arm gently back and forth and twisted it inside her victim. Anita now seemed to be back in the super hot state she was in yesterday afternoon, as her sister remembered.

Birgit saw that Anita was lying with her eyes closed and apparently had forgotten everything around her. She turned her head back and forth and let out guttural sounds. Simone had worked through the internal sphincter and her arm slipped deeper into Anita. Aoooohhhhhaaah, moaned Anita in the highest pleasure and moved her pelvis against the welcome intruder. Birgit watched breathless with her mouth wide open. Half of Simone's forearm had now disappeared into her sister! Incredible!

But Simone did not stop. On and on she pushed her arm deeper in the defenseless Anita. After a few minutes, in which she slowly fisted Anita, she had her arm actually sunk in up to the elbow. She pulled back until only her hand was left in Anita's small, firm ass and then pushed back into her up to her elbow again. Anita let out a scream of lust.

Simone's movements became faster and faster. Finally, she fisted Anita with the full length of her forearm. Yessss please fist meeee! Anita demanded in her highest pleasure. Simone pulled her arm all the way out and then punched it in with full force in one swift motion deep in Anita dilated ass. Please fist me deeper!! Anita barked out. Simone fisted her with full force nearly up to the middle of her elbow and after a few minutes Anita writhed in her bonds violently.

Faaasterrrrrr!!!! Anita cried at the top of her lungs. Simone stuck her arm deep inside Anita and then moved her arm very quickly back and forth but just a few centimeters. That finally brought Anita over the edge and she moaned uncontrollably as her huge orgasm overtook her. Exhausted and sweating, she fell back on the sling. Anita was breathing heavily, while Simone smilingly took off the gloves.



[b]Chapter 14: Birgit has fun too[/b]

Then she turned to Birgit and said that she could eat something, while her sister is resting and would then be prepared for her afternoon treatments. Today lunch would be served an hour earlier than yesterday, so that afterwards there would be sufficient time available for Anita's treatment, said Simone.

She unbuckled the still confused, but at the same time also aroused Birgit and led her into the common-room. Again there was a light meal prepared for them on the kitchen. Today she stayed alone while eating and thought about what she had witnessed so far.

Birgit found her sister pretty extreme; that Anita's anal fetish had reached such dimensions she couldn’t imagine before she attended these treatments. Birgit didn't feel anxious about Anita anymore, like she did yesterday, but she could not quite comprehend the whole thing. Surely, she had already discovered how exciting anal play can be, but this coupled with the masochism of her sister seemed quite strange to her.

Birgit could not imagine enduring such severe treatments herself. Still it was quite erotic. She was looking forward to the afternoon and silently hoped that she would get a nice easy treatment too, like she had yesterday. After all, the sight of her sister during her severe treatments had not only frightened her, but made her pretty horny. As Anita had her orgasm she was eager to feel something inside her ass and to be satisfied too.

After lunch, Simone appeared and told her that Anita is still being flushed and would then get a massage to be relaxed for the afternoon treatments. Do you also want a small treatment Simone asked. Birgit said delightedly yes, please. Ok, come with me then.

Birgit led Simone into the room where her bladder cleansing was administered yesterday. Birgit sat down on the gyno-chair and Simone asked her, while she strapped Birgit onto it, if she would like to have her ass dilated a little bit? Birgit blushed. Had Simone read her mind? Yes, Birgit answered, I would like to be stretched, but please not as strong as my sister. Simone smiled. Don’t worry, your sister has been treated here for a long time and is therefore very well trained. I'm going to be very gentle with you.

Simone asked Birgit whether she could imagine coming here on regular base and let herself trained anally. Birgit said that she was pretty sure that this would not be the last time she would be here for treatments, but she would strongly prefer gentle ones. I’m probably not as predisposed to anal masochism as my sister, Birgit said. I like this clinic very much, but i want to keep up with the erotic and more relaxing treatments. Simone said she understood. Every patient would indeed be treated as she wished: Hard or Soft, she smiled.

Meanwhile, Simone had Birgit's anus lubricated and was massaging it gently. Birgit felt her excitement come and leaned back. Gorgeous! she thought. Simone penetrated her tenderly with one, then two fingers, and Birgit moaned in pleasure. Simone picked up a small speculum. I will now pre-stretch you a little bit before I take a dildo and will give you a nice fucking with it, said Simone and Birgit looked between her legs as the speculum disappeared in her ass.

Simone slowly turned it open. Birgit soon noticed a slight pain in her rectum and as it got quite uncomfortable, Simone stopped and turned the screw back. She opened again and repeated the process like she did with Anita. Birgit enjoyed feeling the same lewd things as her sister, and when Simone took a small dildo and stuck it deeply in Birgit's sweet butt she closed her eyes and moaned loudly as she got overcome with fierce lust.

Simone penetrated her for a while and then took a larger dildo. Like yesterday, Birgit was devoted to the sensations and hardly noticed that Simone had changed the dildo. Finally, she felt a significantly thicker prick at her ass and she opened her eyes. Simone now had a dildo of about 5cm in hand and pressed it slowly in Birgit rosette. Birgit almost said stop but her lust commanded her to let Simone continue. She closed her eyes and remembered what Simone had commanded during her sisters stretching: push! Birgit took a deep breath and pushed her abdomen out as during child birth. Her ass actually gave way and the dildo slid into her.

Birgit realized how thick this prick was, but at the same time she was totally horny at the thought of what a huge cock fucking her right now in her sweet teeny ass. Simone fucked her faster and Birgit noticed how her lust condensed into a huge orgasm. She imagined she was not being fucked by Simone, but from a real cock and with these fantasies she brought herself almost to the summit. Then she heard a low hum and at the same moment Simone pressed a vibrator on Birgit's clit. She tugged at her bonds, and seconds later she yelled her lust out in a huge orgasm. Wave after wave flooded through her, while Simone fucked her now very fast and violently in her ass. Only after half a minute did the orgasm subside and she got quiet.

Simone pulled the dildo out of her and washed the sweat from Birgit's forehead. She then picked up a Foley catheter and explained to Birgit that Anita's treatment this afternoon was expected to last quite long, and she would have no time in between to take care of Birgit. She would be also strapped and would not be able to stand up. Therefore, she would wear a catheter and would not need to worry about her bladder, Simone said smilingly. Birgit was a little surprised, but didn’t complain, as Dr. Lay had commanded yesterday.

Then Simone unstrapped Birgit and led her into another treatment room.

[b]Chapter 15: Preparations[/b]

Birgit was super excited to see what was going on with her sister When she entered the room she had a strong premonition that all was not well. An alarming looking gyno-chair captured her view. The gynecological chair her sister was strapped on yesterday had already made a pretty menacing impression, but this one beat everything. Birgit gulped as she imagined that Anita would soon be strapped down on this torture rack.

Next to this chair stood some supply carts with accessories, but these were covered by cloths. When she looked around the room, her presentiment was further enhanced because there was a different chair than was set up before for her. Although this one was also upholstered with white leather, it was designed much more robust and bonds were attached everywhere. Aha, so this time I will be also strapped down totally, Birgit thought; a shudder ran through her body. Please sit down Simone said, and fixed Birgit to her chair. The Foley catheter was connected to a drain provided in the seat. Birgit couldn’t move a millimeter anymore thanks to the many shackles.

Simone explained that Anita's upcoming treatment would be quite strenuous for her sister. Because she had to concentrate at times, she must not be distracted or disturbed in any way. Then Simone also put a ball gag with a built-in drinking device in Birgit's mouth. Birgit was feeling really queasy. What the heck will go on here?

Simone left the room, presumably to pick up Anita as Birgit suspected. Birgit looked around the room, observing in particular the gyno-chair; or more operating table. Like the other treatment chairs, it was mounted on a thick, height-adjustable column, but at that point the similarities came to an end.

The body support consisted of several individual segments, interconnected in hinges. These segments consisted of a stainless steel ground plate upholstered with latex padding and they were shaped according to the outline of a human body. There were separate supports for feet, legs, arms and torso; even for the head, another separate plate was provided. The supports for legs and arms were two-parted and were, like all segments, individually adjustable. At the end of the armrests two vertical handles were attached. Additional numerous heavy-duty straps commanded respect. The surface of the latex upholstery were not flat, but rather formed out to match the shape of the human body, so that Anita would lie down in a kind of hollow mold. The adjustment of the individual segments was electric; Birgit could see from a control panel standing next to the chair. Apparently the strapped patient could be moved into every position imaginable.

The door opened and Simone and her colleague led Anita inside. Anita's sight caught Birgit's eyes, because her body glistened with oil from the previous massage. Birgit thought she looked extremely sexy. She looked at her big sister and she got aware of how pretty Anita was. Her small, firm breasts stood out perfect from her toned body, her nipples were stiff with excitement, her long brunette hair was now braided into a ponytail. Her petite, slender body really was a very erotic sight. Anita had already brought herself into a trance-like state, because she did not notice her sister at all. She looked at the gyno-chair on which she would soon be strapped to, closed her eyes for a moment and took a deep breath. Then without hesitation she went to the chair. Simone's colleague drove the body support down so that Anita could easily sit down on it. Then the chair went back upwards and the assistants began to fasten the straps. Simone fetched two oddly shaped parts with which she fixed Anita's feet. Birgit thought they looked similar to water-ski bindings . Simone put these devices over Anita's feet and inserted them into guides at the vertical footrests. These latex bindings were slightly conical and as Simone slid them down the guides, she clamped Anita's feet to the footrests. Then she fixed these bindings in the guides. Meanwhile, her colleague had already strapped Anita's arms. Her head laid in the hollow of the headrest and was now tightly fixed with a kind of harness that went around her head in multiple planes. A wide latex belt was tightened over Anita's chest. It had openings for her breasts, which jutted out provocative. Her legs and her pelvis were also buckled with many straps to the body supports. Anita could hardly move. Then, Simone spread Anita's legs, put an Foley catheter in her bladder and led the tube backwards over Anita's abdominal wall to the side and connected it to a fitting below the torso support.

Simone then drove Anita's legs wide apart and simultaneously towards her body. Her sweet little butt was now easily accessible.

Just as Simone began to lubricate Anita's slightly gaping anus, the door opened again and Dr. Lay appeared.

Just like yesterday, she had dressed again in black latex. Today she wore a black latex dress that was tight as a corset with a low neckline and that emphasized her large, full breasts beautifully. The dress was cut wide downwards and reached up to her knees. She also wore black latex stockings and gloves. She wore black high-heeled boots. Her blond hair was tied back as severely as yesterday. Dr. Lay completed her ensemble with strong makeup. In whole, she made a redoubtable impress on Birgit.

She went over to Anita and greeted her briefly. Hi Anita, I hope you're ready for your anal stretching? Today's its getting quite hard as you already know, she said with a stern face. Yes, said Anita, I am now relaxed and opened up. This may help you a bit, Dr. Lay said with a menacing undertone. Then we'll begin. First, I'm going to drive you into the correct position.

She Dr. Lay pressed a few buttons on the control panel and the chair, together with the defenseless Anita, began to move. She initially tilted Anita slightly back so that she was horizontal. Then she turned her thighs even further towards the body until they aligned with Anita's torso; the lower legs moving in sync. Then she spread her legs apart a bit and the legs turned at the same time further out. The movements of the chair ingeniously imitated the natural movements of the body. Then her arms were bent and went down behind her back. The strenous position caused Anita's breasts to look even better. Anita sighed a little, because a proper tension had built up in her body and she was pressed firmly into the shackles. She could now no longer move even a single millimeter.

Birgit watched spellbound. The perfectly shaved pubic area of her sister was now completely accessible and her cute asshole was squeezed out provocatively. The extreme spread of her legs had pulled her buttocks apart so far that her ass was a virtually flat surface with her slightly open anus in the center.

Dr. Lay now had free access to Anita's pleasure hole. She took some lube and massaged Anita's rosette. So she said smiling profoundly to Anita, let's see how far you can open your small hole today.

Birgit swallowed. Anita had been extremely opened up just a short time ago; Simone had even anally fisted her! And now it will start boi time?

What the hell would Dr. Lay have her sister endure now? Birgit realized why she had been bound and gagged. Her excitement ceased when she thought of what lay before Anita. Slowly, she felt queasy again.

Dr. Lay took a three prong anal speculum and inserted it into Anita's already slightly gaping anus. Due to the extreme position she had lost control over her sphincter and could not quite close it; which was what was actually intended. Dr. Lay turned the screw, slowly and evenly the speculum opened. When she had reached approximately 6cm in diameter Anita breathed hard in and out, but Dr. Lay turned the screw further. Then Anita moaned loudly and Dr. Lay said, well, I don't think you're not relaxed enough. I should give you a helping hand, though. Please fetch the penetrator, she said to Simone's colleague.

Penetrator? That will probably mean fucking machine, Birgit thought as the assistant rolled the unit in from the supply room.

On a white painted frame was indeed mounted a kind of fucking machine. Birgit had seen such a device in an erotic catalogue, but this one was built much more stable.

At the front was a mandrel sticking out, on which a dildo could be attached. This mandrel was connected with a pivot to a flywheel, which was powered by a sturdy looking motor.

Mounted on its side was a control panel. The cable that was hanging out got connected to the main control panel. The assistant positioned the machine centered in front of Anita's butt. Simone screwed a thin dildo on the mandrel and rolled the device closer towards Anita. Dr. Lay regulated the height of the chair to align the dildo with Anita's asshole and locked the frame at its wheels. The assistant turned a threaded spindle and adjusted the machines angle to Anita's position. Simone drove the dildo slowly into Anita and verified the position of the machine.

Just a small readjustment of the angle and the unit was ready. Simone drove the dildo back out completely out of Anita and changed it with a much thicker specimen. Birgit estimated approximately 6cm in diameter. The dildo was thickly coated with lubricant and then pressed forward slowly, deep into Anita's compliant backside.

Anita, who had not muttered a single peep until now, groaned full of enjoyment. Her pussy was a little damp, as Birgit noticed after a sharp look. It was still hard for her to understand that her sister really enjoyed this seemingly extreme treatment. But no doubt, beside the strain, that there was lust at work in Anita. Birgit realized that the anal masochism of her sister still felt strange to her, even if she had received a very good explanation by Simone yesterday. She respected her sister, and somehow Birgit admired Anita very much, but she realized that she could not share such extreme feelings. Simone adjusted the turning points of the dildo and Dr. Lay picked up the controller. So now you're going to get a proper fuck, she said to Anita, so that your ass will be able to stretch out very far afterwards. She turned on the engine and the dildo began to fuck Anita's butt. MMMMHHHHMMM Anita said as she felt the movements of the thick prick in her hot ass. With gradually increases, Dr. Lay regulated the speed until the dildo made about 2 strokes per second.

That was quite decent, Birgit thought.

, Dr. Lay said. Thus, she left the room. Anita moaned softly. She seemed to really enjoy the fucking machine. 15 minutes later, Dr. Lay was back and drove the dildo out of Anita's butt. Simone gave her a much thicker one, which was screwed onto the mandrel and soon disappeared in Anita's small yet eager ass. Anita had to endure the fuck for another 15 minutes, then Dr. Lay said that it would now be time to take a real dick. Birgit's eyes widened when Simone was preparing the next prick. This dildo was easily seven centimeters in diameter!

Birgit was amazed. Now it‘s getting down to business, she thought. Although the dildo had a smooth shank like its predecessors, this time a real big penis was formed. Simone mounted it on the mandrel and Dr. Lay drove it right up into Anita's anus. She probably felt how thick the dildo was that now entered her, because she was breathing audibly. Dr. Lay slowly drove the mandrel forward. Anita moaned as the tool stretched her taunt sphincter. Dr. Lay did not stop and let it continue to drive into Anita. Oooohhhhhcchh came softly out of Anita's mouth.

Well, you will probably feel this one better, said Dr. Lay. Yes, he's really nice and thick, Anita moaned excited. Then you may enjoy it a while said Dr. Lay. I'm going to penetrate you with various settings she said, then you should be pretty relaxed so I'll have no trouble during your expansion. I have still some plans with you for today.

, and something like a horny anticipation crept up her back. She got really excited at the thought, because now she had accepted the fact that her sister got real pleasure by this sadistic treatment.

Anita got close to a orgasm several times as she was fucked this massive dildo. Birgit was also kept pretty hot at the sight of her sister strapped down on this obscene rack and getting fucked mercilessly by an emotionless machine. Birgit wanted to play with her clit, as she imagined that it was she who knelt in front of a nice guy and was fucked her ass heavily. Hopefully I will have a new boyfriend pretty soon, she thought. He won’t know what hit him, she chuckled to herself.

Dr. Lay fucked Anita rather quickly and seemed to be very pleased. Birgit noticed that when she was close to cumming, every time Dr. Lay would regulate the speed down and Anita's lust waves faltered. Then Dr. Lay would change the settings of the machine and the stiff dildo would drive in long lines completely out of Anita's ass before it entered again. Every time the fat acorn of the phalic dildo stretched her sphincter, Birgit could clearly see how Anita's anus was pulled out before it gave up and let the dildo slide out.

Dr. Lay increased the speed more and more. Anita was moaning now. No longer purely pleasurable, she seemed to reach again that desired state in which pleasure and pain were balanced. Dr. Lay repeatedly changed the speed between very slow in and out and brutal penetration. Anita seemed to be really torn between all extremes of her emotions. At times she moaned softly, then she gripped the handles and yelled out in excitement.

Dr. Lay played masterfully with her feelings. Finally she changed the setting again so that only the fat acorn penetrated Anita's sphincter in very short strokes. She increased the speed up to about 2 strokes per second, leaving Anita alone again for a quarter of an hour. From time to time Simone dripped lube onto the dildo, while Anita now showed clear signs of discomfort. Apparently this quick penetration of her sphincter only was not so easy to bear. Birgit still looked spellbound. Really amazing what's going up here, she thought. She never would have guessed what was hidden inside Anita.

Dr. Lay came back and stopped the penetration. This "relaxation exercises" of her sister had lasted about two hours.

Then let's see if your little asshole can now widen better, said Dr. Lay and picked up the large three-prong speculum again. She slowly turned the screw and indeed, Anita opened up much easier now. Just before about 7cm had been reached, Anita moaned softly. Well, now it works so much better, she said to Anita. Now we can begin.

Birgit was curious what was to come next.



[b]Chapter 16: Anita's expansion training[/b]

Nurse, please get the first cone expander, Dr. Lay said to Simone's colleague.

The assistant again went into the next room, returned the well-used penetrator to its storage place, and came back out again with a very similar frame . This was, however, built significantly more sturdy and had larger wheels. On top of the wheeled frame an elongated square case was mounted; which obviously had a powerful motor attached to one end. At the other end a thick spindle with a threaded connection on its front came out. Like the fucking machine before, this device was also adjustable in its angle by a threaded spindle. The assistant rolled the frame in, centered in front of Anita, and extended a mounting bracket to the front. On the bracket were two strong, long finger-thick bolts These were fitted in holes below the body support of the gyno-chair. With that done, the cone expander, as Dr. Lay had called the device, was fixed to the chair.

Dr. Lay said that she would drive Anita into the stretching position now and picked up the control panel of the chair. Anita was somewhat more inclined backwards so that her head was now the deepest part of the body. Then Anita's back legs went even further, so that her knees were already below her back. At the same time, the legs spread further apart. Anita moaned quietly because of the tension in her body.

Then her arms were driven a little further down to the rear and her breasts pressed out from their bindings exquisitely. Her head was tilted back so far that Birgit, unfortunately, could not look at her face anymore. Anita could absolutely not move anymore. Only her hands turned slowly back and forth around the handles.

In addition, the frame wheels had now been blocked. To the spindle of the cone expander the assistant mounted a dildo and Dr. Lay operated the device. The motor started and the spindle moved slowly out of the housing. When the dildo was inserted far enough into Anita's anus, Simone adjusted the angle of the spindle, while Dr. Lay adjusted the height of the chair.

The dildo drove slowly out of Anita's anus. Meanwhile, Simone's colleague had already lubed a attachment for the spindle, and Birgit now knew why the device was called cone expander.

A black truncated cone made from silicone of about 18 cm in length was screwed to the spindle. Birgit estimated that the front diameter at the rounded tip of the cone was about 6cm diameter and then gently expanded. About 5 cm before the end of this expander, the cone turned into a straight shaft. Birgit watched spellbound. What for incredible devices are used here, she thought.

Well, then let's get started said Dr. Lay, as she drove the cone expander slowly towards Anita's slightly open anus. To welcome you to your stretching session, I will first open you up with a thinner expander, this one goes from 6 to 7 centimeters in diameter. You should not have any problems with it. Dr. Lay pressed some buttons on the control panel and the expander moved slowly.

Anita moaned lustfully as the tip went into her anus. Evenly, millimeter by millimeter the cone drove into Anita's receptive ass. Without stopping, the powerful motor pressed the cone inside in Birgit's sister until it had finally sunk in up to the full circular diameter. Dr. Lay drove the cone back out rapidly and a new journey in Anita's rectum began. Ten times she repeated this procedure, accompanied by Anita with soothing sounds. Then the expander was driven fully back and Simone unscrewed it from the spindle. Her colleague handed her the next, larger cone.

Dr. Lay said, now comes the next one, from 6.5 to 7.5 cm. To Brigit's astonishment this cone was absorbed by Anita almost without any problem in one stroke. Anita breathed only once heard and deep as the full diameter stretched her ass. How thick the expander looks, when it's in Anita's little butt, Birgit thought. Incredible. During the insertion of the next expander from 7 to 8 cm, some resistance was clearly quite noticeable. It's really huge, Birgit thought gulping as it was screwed to the spindle. This monster is supposed to fit into my sisters small ass? Madness. How can she stand this?

Dr. Lay drove the expander into Anita's anus, and the tip of at least 7 centimeters in diameter pressed her wide open sphincter. Now it's getting a bit harder for you, Dr. Lay said to Anita.

When Anita felt Dr. Lay drive the stretcher into her, she closed her eyes and relaxed. She let her anus relax and await further insertion of the cone. Birgit watched eagerly as the cone’s tip spread her sister's ass wide and penetrated through the sphincter slowly. Anita quietly breathed in and out. Millimeter by millimeter, the strong engine drove the cone into her. Anita's sweet asshole became more and more spread open. About a third of this cone expander had disappeared into her, as a soft moan and strong breaths revealed that she had to make some effort to endure this strain. Still a little more of the cone pressed into Anita's ass before she moaned loudly and Dr. Lay stopped the movement. Anita lay panting in her bonds. But the pause that Dr. Lay gave her was short. The motor hummed again and the cone continued its journey into Anita behind. Birgit regretted not being able to watch her sister's face. Surely her stress was to be seen clearly, she assumed.

Anita moaned and twisted her tightly closed hands around the handles. Dr. Lay let the cone drive in further. After a few seconds she drove the cone slightly back and reduced the pressure on Anita's anus. Anita sighed with relief, but after a short period time, Dr. Lay restarted the process and the cone was again pressed into Anita. Anita took a deep breath and bore down to open up her sphincter. The expander went in further than the previous time. Anita exhaled noisily and groaned heavily. Dr. Lay again turned the controller and the cone went deeper into Anita's intestines. Anita again pressed her anus out to support her expansion. Dr. Lay increased the pressure with which the cone expander drilled into Anita. Anita cramped and let out a groaning sound. Birgit watched stunned and was breathing intermittently. This extreme anal stretching of her sister totally enthralled her.

Anita let out moans of pain and Dr. Lay stopped the stretcher briefly. Push! she commanded. Anita took a deep breath and pushed as hard as she could. Dr. Lay immediately turned the controller and the motor started. Again the expander sank deeper into Anita rectum and widened her anus. When Anita exhaled, Dr. Lay stopped the feed, but let the stretcher rest in the position reached. You have almost made it, Dr. Lay said. You must now push with all your might, then I will press the expander in completely. Are you ready? she asked Anita.

Yes, Anita breathed between her heavy breaths.

Dr. Lay picked up the controller and said sternly: Push! Anita took a deep breath and pushed. Dr. Lay turned the motor on a level. The expander sunk deeper and deeper into Anita's ass. Birgit held her breath. That is totally crazy! she thought. More and more of the expander disappeared into her sister. Anita let out a hiss. Go on, push! ordered Dr. Lay. Anita moaned briefly, took another breath and pressed her anus out wide. Dr. Lay gave more pressure, and slowly the expander pushed itself with its full 8 centimeters into Anita's ass.

Anita moaned loudly as the widest part passed her sphincter. Panting and sighing, she lay in her bonds, she had actually swallowed this tremendous cone!

Birgit watched her sister very excited. Amazing how cool that looks. The expander is so fat, she thought. Again, she felt something like pride for her sister.

After about a minute, Dr. Lay withdrew the stretcher out to about halfway out of Anita's butt. Anita sighed in relief, but Dr. Lay returned to the feed immediately and told Anita to push again! Slowly the huge device drilled into Anita. This time, Dr. Lay inserted it slowly but steadily. Among Anita sighs and moans of pain the cone again disappeared completely. As before, the process was repeated 10 times. This enhances the training Dr. Lay said.

Birgit could clearly determine that it got easier from time to time, until her sister finally showed hardly any sign of effort any more.

Well, Dr. Lay said to Anita, You deserve a little break. Simone will now massage you a little bit, in a quarter of an hour I’ll be back.

Little break? Birgit thought. So there's more to come? Crazy! The anal desires of her sister appeared almost fathomable.

Simone dried the sweat off Anita and then took some massage oil. She massaged her tensed muscles and Anita relaxed rapidly, although her position was kept unchanged and also the stretcher was still inside her. When Simone also massaged her pussy she moaned with joy.

Just after a quarter of an hour, Dr. Lay appeared again in the treatment room. She smiled to Birgit and sat down at the control panel. In the meantime Simone's colleague had prepared another expander, that in Birgit eyes already had truly menacing proportions. Ok, Anita, said Dr. Lay, on we go with the next size. The next cone on the program is 8.5 cm. Anita sighed softly and closed her fingers around the handles.

The expander approached Anita's rosette. The at least 7.5 cm of the tip slid inside with almost no resistance. Again Anita pushed her ass out and Dr. Lay increased the pressure more and more. Step by step, the machine did its work, and Anita's little ass was dilated more and more. Now Dr. Lay had to stop the feed quite often since Anita gave sounds of significant pain from her. Her moans became louder and louder as the expander disappeared deeper into her. Finally, with much sighing and whining, she had taken even this 8.5 cm dilator fully inside her. Birgit was amazed. This is just crazy what's going on, she thought.

After the usual ten times of repeated insertion the expander was changed again. Should this go on forever? Birgit could not believe it. Like yesterday, she was almost fearful for her sister's wellbeing. Nevertheless, she was excited in a peculiar way.

Well, said Dr. Lay, only one dilator more, then you have reached your goal for today. Birgit relaxed a little, because as the assistant picked up the next cone, some bad feelings had taken hold of her. How can her sister stand it? During the insertion of the last expander she cried in pain and had requested Dr. Lay repeatedly to proceed more slowly. Well, fortunately only one more, Birgit thought. After that Anita would be stretched to incredible 9 cm. Madness! That her sister could ask for such an extreme treatment, she had not even dreamed about this morning.

Dr. Lay began again with the insertion. This time, Anita needed much more time until she had swallowed the expander completely into herself. Her pain and long-drawn moans slowly reached alarming proportions. Birgit moved in her bonds as she watched the action breathlessly. She suffered with her sister and wondered again how one could experience lust during such an agonizing treatment. But it was clear to see that Anita voluntarily underwent her tortures.

With this 9cm dilator, Dr. Lay penetrated Anita's anus 20 times to train her. Finally, Dr. Lay drove the stretcher completely out of her victim and stood up.



[b]Chapter 17: Extreme anal[/b]

She went to Anita's head and smiled to the sweaty teen. Well, how did you enjoy your treatment today? she asked friendly. You've really made an effort to open yourself up, she praised.

It was very cool, Anita said. It feels so good when the dilator goes deeper and deeper in me and I finally feel the full diameter sliding inside me. I cannot get enough of that! she said in an excited voice.

Birgit was once again speechless. She had really enjoyed it? She could not understand her sisters anal preferences, but it was still admirable how Anita was able to motivate herself, to train her ass probably quite often until she had reached this state.

Well, Dr. Lay said with a smile, you can come back anytime for anal training, if you want.

Anita was quiet for a moment, then she took a deep breath and said in a humble, quiet voice: I would like to ask you to stretch me a bit more now, if that's possible. Dr. Lay smiled and replied: So you have not had enough for today? No, I feel that I can go further, Anita replied.

What had her sister just demanded? Birgit could not believe her ears. She wants more of this super extreme stretching?

Even more torture? Even bigger things in her ass? Birgit was totally stunned. She had never expected this, after all she had noticed how exhausting and probably painful the last two stretchers had been for Anita. It took over an hour until the last 9 cm dilator had completely been put inside of Anita! Again and again she had silently asked during severe moans of pain that Dr. Lay would slow down. And now she still wanted more? Birgit felt enormous respect for her sister.

Ok, Dr. Lay said. Then we'll go back to the 9 cm dilator for you. Simone will massage you again so that you are relaxed when we widen your sweet ass up even more.

Dr. Lay left the room again and Simone smilingly wiped the thick drops of sweat from Anita's forehead. Then both assistants began to massage Anita; this, she welcomed with pleasure. Birgit was trying to organize her thoughts in this pause, but somehow she was overwhelmed with the masochism of her sister. But nevertheless, she found the prospect of watching the further stretching of her sister quite exciting.

Dr. Lay came back and went to Anita. Are you ready? she asked. Yes, Anita said, I feel relaxed again. You know that it will be even harder for you now, and you will suffer a lot, if I stretch you to even more extremes, she asked sternly.

I am willing to endure more, Anita replied.

Well, let's get started now. First, we will move you into a slightly different position and bind you even more strictly, Dr. Lay said. She went to the control board and drove the stretcher out of Anita's anus. Birgit was amazed how incredible open she remained.

Then Dr. Lay operated the controls of the gyno chair. Anita was shifted forward a little so that Birgit could now see her sister's face again. She had her eyes closed and looked, to Birgit's astonishment, relaxed and fresh. She must have trained herself pretty often in order to take this treatment so easily, Birgit thought. Anita's arms were driven back up to body height and then stretched back over her head. Dr. Lay spread her legs a little further and then flipped the thighs back until the legs were almost straight. Anita was now in a kind of splits in the chair. Then the legs went a little further down until they were below her body. They were moved together until her feet almost touched below her head. Even more tension than ever before built up in Anita's groin; even more her anal region had been stretched out. Birgit could see how Anita's ass cheeks were now stretched back so far that her anus was clearly protruding. Apparently in this extreme position she had lost of any control over her sphincter, because it was now gaping open wide.

Anita's arms were now moved over her legs forward until they stood at 90degree angle from her body.

Then Anita's torso went further back, so that her back is now a distinct arc. Thereafter, the stretched arms moving diagonally down and forward until they stood beneath her body parallel to each other. More and more tension built up into Anita, her perky breasts stood upright from her chest. Her head was also stretched back even further, but Birgit could clearly see Anita's facial expressions, even though she now looked towards the ceiling. Then Simone and her colleague re-adjusted her straps, even the foot bindings were adjusted tightly. Finally, Simone took off the head-harness and her colleague handed her another one. This one had a big gag, on which Anita could bite like on a diver’s mouthpiece.

She could breathe through a hole in the middle of the gag, but of course not speak any more. The gag was secured with several latex belts. A wide chin strap ensured that she couldn't push the gag out. In addition, the assistant handed two wide, very firm latex straps that ran over Anita's face and the mouth gag and were fixed to the chair under the headrest. The belts were then adjusted very tight and now her head was thoroughly fixed. Anita's body seemed like a bowstring, she could not move a single millimeter.

The stretching machine was adjusted to the new position and a larger cone expander mounted. Ok, Anita, said Dr. Lay, as you wished you will now be even more stretched and widened. In the first step we go up to 9.25 cm. The gradations of the stretcher are smaller now to reduce your stress. However, it soon will become quite agonizing for you. She drove the stretcher forward. The tip of the huge cone pressed into Anita's wide open asshole.

Birgit could watch her sister's face changing to a concentrated expression, and Anita closed her eyes.

Birgit shifted a little nervous in her bonds back and forth. What would happen now? Could her sister really endure more stretching? Somehow she had the uneasy feeling that the treatments would come right to the point now and Anita wound have to suffer a lot soon. Birgit tried to calm down and stared at the expander tool that now drove slowly into the anus of her sister.

To Birgit's astonishment Anita moaned with relish, as the tip sank into her. She breathed deeply and evenly as more and more of the cone was pressed into her. Birgit could hear more clearly than before the breathing of her sister through the gag now. When she had taken about 1/3 of the stretcher, her respiratory rate increased significantly. First moans mingled with the sound of breathing.

However, Dr. Lay not yet stopped the forward movement of the stretcher. Millimeter by millimeter, the machine pushed the mighty cone into Anita's rectum. Anita began to breathe faster. Her moans grew louder. Finally, she clenched in her bonds, her jerky breaths produced a dimmed whistle in the opening of the mouth gag. Birgit clearly could see her sister's strain. When Anita let loose a slow groaning sound, Dr. Lay stopped the insertion. Anita was breathing heavily in the gyno chair but Birgit saw to her surprise, that she had already taken half of the expander. Simone stood next to Anita's head and watched her closely. When Anita calmed down a little she said to her: You have to try to relax yourself and to loosen your sphincter. If you feel that it becomes cramped, push! Anita looked up at Simone and did a consentient sound.

Dr. Lay went back to the controller and drove the stretcher slightly backwards. But a moment later she reversed the feed and it went deep into Anita's rectum. Anita closed her eyes and pushed her anus out. Dr. Lay waited for her push and now turned the controller knob. The powerful engine pushed the plug further into Anita's defenseless opening. She again took a deep breath and continued to push her sphincter out. Dr. Lay adjusted the machine for even a little more pressure and the cone sank deeper and deeper into Anita's rectum.

Birgit forgot to breathe. With wide open eyes she stared at the scene taking place in front of her. Anita exhausted the pent-up air in her lungs and Dr. Lay immediately stopped the feed motion. A deep groan full of pain came from the gag. Anita's eyes were fixed to the ceiling as she lay in her bonds heavily breathing.

Then Birgit looked at the stretcher. Incredibly she thought. Her sister had swallowed at least 2/3 of the gigantic tool. After Anita's breaths were calm again Dr. Lay drove the stretcher a few centimeters out of Anita. As usual, she reversed the feed immediatly and said to Anita, this time with commanding voice: push! Anita took a deep breath, closed her eyes and when she felt the strain grew in her sweet ass she pushed out as hard as she could.

Dr. Lay adjusted the feed to higher settings. Deeper than before the huge cone sunk in and stretched Anita's anus open more and more. Thick drops of sweat stood on Anita's face as she moaned in pain and breathed deeply and quickly. Go! barked Dr. Lay, who had slightly reduced the feed. Push! Play up!! Anita took another deep breath and closed her eyes. She pushed out with all her might, and Dr. Lay mercilessly continued to increase the machines pressure on Anita's tantalized anus.

More and more of the cone sunk into Anita's behind. Once more Anita took a deep breath to squeeze her sphincter out again. Dr. Lay adjusted the feed further and the cone went deep into the incredibly wide stretched ass until the straight part of the shaft had slipped in fully. Dr. Lay stopped the feed and Anita moaned heartbreakingly. But she made it! Her anus was now dilated to an impressive 9.25 cm!

With closed eyes in her bonds, Anita was breathing heavily and sighing. Simone stood smilingly next to her. Birgit also breathed heavily. The happening before her eyes was incredible. How can she stand this? Birgit could not believe what her sister was willing to undergo. Birgit was super nervous, even her hands were shaking a little. Birgit got calm when she saw that her sister had relaxed again, and finally, when Anita wiped the sweat from her forehead, she smiled at her. However, as the training continued and Anita was penetrated 20 times, she had to push out pretty hard the first few times, to open herself up sufficiently for the thick intruder.

Dr. Lay drove the cone back completely and to Birgit's amazement Simone's colleague mounted unasked, and like a duck takes to water, the next in size anal expander to the spindle.

Well, Dr. Lay said, here comes the second step, we will now open you up to 9.5 cm. Try again to pull your socks up so I can stretch you further without problems. Anita gurgled unintelligible sounds through her gag. Birgit tensed up again, as Dr. Lay drove the huge cone towards her sister.

When Anita felt the tip of the monstrous stretcher on her wide open asshole, she closed her eyes and got prepared for the next grueling augmentation of her distension. Deeply breathing, her face again got the highly concentrated expression, as Birgit saw. Dr. Lay slowly drove the expander cone into Anita's anus. After about 1/3 of the length a clear resistance became noticeable, the engine got slower. But without mercy Dr. Lay continued to turn up the feed and the cone pressed in further into the heavily moaning Anita. Then she took a deep breath and pushed out again.

Stunned, Birgit gazed at her totally engrossed sister. She could not even think about what she saw, she was totally absorbed. Clearly she could see that it got harder and harder for Anita to endure her distension treatment. This 9.5 cm dilator she could not take as quickly and easily as before. Dr. Lay had to interrupt the stretching multiple times to give Anita's wide spread ass a short break. But without mercy the expander was forced further and further into the sweet firm ass of her sister. Finally, Birgit estimated after about three quarters of an hour, the straight section also of this stretcher sunk completely into Anita's butt, accompanied by groans of pain.

Soaked in sweat, heavily breathing and moaning Anita lay in her extreme bondage. Simone wiped off the sweat, then she was again penetrated 20 times with the stretcher. Again, Birgit did not believe her eyes and ears. Anita got more and more relaxed, and finally welcomed the penetrations with clearly lustful moans. Her pussy glistened with moisture, Birgit noted with amazement.

This time, Birgit was not surprised as the assistant lubricated an again larger expander cone and mounted it on the spindle. Without any negative behavior from Anita the eerie stretching continued. This time she fought with the intruder for over an hour before the machine had overcome her sphincters resistance and the monstrous dilator completely stuck in her.

After the usual 20 insertion penetration cycle Dr. Lay stood up and said that Anita will now have again a fifteen minute break and will get a massage, before she will have to take in the last stretcher.

Birgit relaxed a little. Only one more cone, then Anita is finally released, she thought, forgetting that her sister had explicitly requested such a treatment previously.

After the massage, Dr. Lay came back and drove the 9.75cm stretcher out of Anita's ass. This morning, Anita's asshole was firmly closed, but was now gaping obscenely wide open.

Then the final, almost gigantic expander was attached to the spindle. How big this one looks, Birgit thought with consternation. The assistant can barely grasp around this monster with both of her hands. And this giant is supposed to be pressed right into my sister? Crazy, she thought.

Dr. Lay said to Anita, now comes the final step to a full 10 cm. Then you're hopefully stretched enough for today, she said sarcastically. Anita and Simone smiled at each other. Then the journey into Anita rectum began again and she took on a strained expression.

Soon, about 2/3 of the expander stuck in Anita. Clearly her strain and suffering during the past hour could be seen in her facial expression. Birgit sat almost shocked in her own bonds. She hovered between rejection and admiration. On one hand, she found this an extremely perverse treatment, but on the other hand, she was highly aroused in a strange and unfamiliar way.

Dr. Lay, who had granted Anita a short break, turned the feed regulator back on. Play up! she said sternly to Anita. You have to fully open up yourself to take the last centimeters into your insatiable ass. Go, push! she ordered to the moaning Anita. Again she took a deep breath and pushed out as hard as she could.

Dr. Lay increased the feed even more. The dilator pressed itself deeper and deeper into Anita. Birgit could clearly hear that the engine was slowed down by the resistance in Anita's sphincter; the cone barely moving by tenths of a millimeter. Anita took another deep breath and increased her efforts. Again soaked in sweat, she lay on the chair when she finally exhaled whistling and Dr. Lay stopped to feed for a second.

Again Anita let out a desperate moan. Birgit wanted to look away and to close her ears, but at the same time she was hornily fascinated.

Dr. Lay drove the cone back slightly, Simone again wiped the sweat from Anita's forehead. Anita was now in a trance, she looked at the ceiling and seemed to hardly notice that Simone took lastingly care of her. After a few deep sighs and intermittent breaths she pushed her anus without further command out again. Dr. Lay immediately put the motor in motion and the cone was pressed deeper into Anita. When the engine showed significant resistance, Dr. Lay regulated the feed to a higher setting immediately and even more pressure built up in Anita's anus. She again increased her effort and now pressed so strong that she became dark red.

The sweat was pouring off of her crisp body. She exhaled and let out a long-drawn howl, expression of the infinite suffering in her inconceivably wide stretched ass. However, Dr. Lay had not yet stopped the feed. Go! Push again!, she ordered the wailing Anita. Again she pressed like mad and the stretcher penetrated even deeper into her. But still there were a few centimeters until the full diameter would be reached. Dr. Lay then drove back a little, then immediately forward to the last position. This she repeated several times. I'm trying to loosen your ass a little and you're about to feel the full diameter, Dr. Lay explained.

Anita intermittently breathed in and out. She had closed her eyes and prepared herself for the ultimate dilation that awaited her now.

Birgit's tension reached its summit. Will Anita stand this? She must have tremendous pain, Birgit thought.

Dr. Lay then turned the control knob and the stretcher began to move again. Anita was still trapped in her trance-like state. When she noticed the increasing pressure she breathed in and out deeply. Dr. Lay increased the feed. Birgit clearly heard how the engine noises became stressed. Anita moaned loudly. She panted through the gag before she bit on it firmly and pushed out her ass again. Dr. Lay now increased even more. More and more of the monstrous stretcher disappeared into Anita's wide open ass. Anita exhaled and yelped at short intervals under her torment. Then Dr. Lay turned the knob to full force. Now the powerful engine pressed the cone into Anita's rectum in a steady, smooth motion. Her eyes gaped in horror. A loud gasp was heard. Then a bloodcurdling scream shrilled through the room.

Aaaaaaaaiiiihhhhoooaaaaahhhh!!!!!!!

Anita's ass was now stretched to a full 10 cm.

Despite the gag Anita wailed her insane pain out loud. Birgit closed her eyes and wanted to run out of the room. My God! What are they doing to my sister? That’s shear madness! She must be in absolute agony!! And that’s how she wants to be treated????? That’s incredible, Birgit thought.

Anita's wailing and moaning slowly subsided. Simone tenderly wiped the sweat from her. You made it, she whispered to Anita. A thin smile played around Anita's lips as she looked at Simone. But Birgit could clearly see how aroused Anita still was.

Despite her pain, she willingly underwent the following training 20 penetrations of the huge 10 cm expander. As before, Birgit could observe again how Anita's lust came back and that she eventually eagerly awaited the impacts of the cone.

Dr. Lay nodded to Simone and she picked up the powerful vibrator, which had been used yesterday. Slowly she massaged Anita's vulva. Dr. Lay increased the frequency of the penetrations and Anita literally melted in pleasure. Her moaning got louder and louder and Birgit observed with astonishment that the facial expressions and sounds resembled exactly those ones her sister had shown just some minutes before during her painful stretching. Does she actually feels lust during her stretching? Birgit stared at her sister in disbelieve and recalled the explanations Simone had given to her yesterday.

Anita sunk deeper and deeper into the desired maelstrom of lust and as Dr. Lay increased the speed of the cone again and violently fucked her ass with the giant dildo. Simone pushed the vibrator on Anita's swollen clit in horny anticipation.

This drove her over the edge. Anita took a breath, rolled her eyes and then yelled out a loud scream as she was torn away by her gigantic orgasm. Wave followed upon wave, Anita moaned and screamed out her pent-up lust. Her super orgasm lasted almost one minute. Dr. Lay, Simone and her colleague grinned broadly over both cheeks, as Anita lay before them in her orgiastic spasms.

Birgit still looked stunned and confused at her sister. After all, she had calmed down a little and had to admit to herself that Anita had actually desired this treatment.

[b]Chapter 18: Surprise[/b]

After Anita's immense orgasm had subsided Dr. Lay drove the cone out of Anita. her Anus remained incredibly wide open.

Simone wiped the sweat from the body, while her colleague cleaned Anita's anus and removed the residuallube .

Well, after this busy day, you two deserve a little relaxation, she said to Birgit and Anita. Simone will take her with you. I wish you lots of fun, she said, and left the treatment room. Simone drove Anita back to a normal seating position and began to unbuckle her. Simone's colleague took care of Birgit.

As both were unbuckled the views of the sisters met. They both smiled a little bashfully. Birgit was still confused though.

Finally, Simone helped the still somewhat shaky Anita to stand up and led the two girls in the bathroom. Sure, we will again get a bath in the Jacuzzi, like yesterday, thought Birgit. But with a quick side glance into the hot tub, she realized that there was something special scheduled, because she could detect a strangely shaped device attached to the seats.

Today we have a little surprise for you, Simone then said. So that you will go home properly relaxed, you get a special massage in the Jacuzzi. She stood close to the tub to explain the device, especially to Birgit. Anita had grinned broadly after Simone's words, she seemed to know very well what's coming, thought Birgit.

In the molded seats a special anal vibrator is installed this time, now said Simone. You will squat over this cylindrical pole that you see rising from the seat and sit down on it. For Birgit a small one is mounted, Anita's pole for today is of course really nice and thick, she said, grinning. Indeed, thought Birgit, who had looked there quickly. The vibrator provided for her had about 4 cm diameter but the one for Anita had at least 9 cm, maybe even more, Birgit appreciated. The poles seemed to be made from a smooth, white plastic, the length in both cases was approximately 15 cm.

In the front of your seat you see a bent arm that will come to lie exactly on your clit, Simone said. In both ones, pole and arm, vibrators are installed, with which will stimulate you nicely. In addition, you also get a bladder irrigation, because a bulging bladder considerably enhances the pleasure that you will feel.

Birgit got goose bumps. She could imagine what she was to experience and forgot about her confusion. Almost trembling with lust, she climbed into the tub and slowly lowered herself down onto the vibrator. Properly greased with lube, she could take it without problems. That's cool man, she thought. Finally I got something in my butt, Birgit thought, because she had not only been frightened today, but in a secret corner of her subconscious also a lot of lust had been held back, which should now get a release.

Simone tied her up as usual in her seat, adjusted the vibrator and connected the bladder catheter. Then she helped Anita in the tub. Birgit was watching as her sister sat down and impaled herself on the super thick vibrator without any problem. Birgit looked appreciatory at her sister and to her own surprise she again felt something like pride for Anita arise in herself. Anita was also strapped down and then the Jacuzzi filled with nice warm water.

I wish you a lot fun, said Simone as the water covered them fully. She started the relaxing program and left the room as yesterday.

Both girls sat back and closed their eyes in anticipation of the upcoming delights. The hot tub began to smother them in soothing bubbles as Birgit could feel her bladder being filled slowly.

Shortly thereafter began the vibrations, barely noticeable her rectum was gently massaged. That's cool man, she thought, and gave herself totally to the feelings. Her bladder was now well filled and the vibrations got a bit stronger. In fact, because of the amount of water in her bladder, the vibrations diffused a lot more intensive through her abdomen. Gentle, she began to moan. Anita had been watching her and smiled, but then too closed her eyes to indulge in the sensations.

Finally, the clit vibrator awaked. Birgit breathed noisily, moaning loudly as her pleasure center was gently stimulated.

Then the pressure was slightly increased in her bladder and Birgit instantly felt that the feelings intensified, although the vibration kept consistent. Full of pleasure she lay in the hot tub. Then the vibrations were increased gradually, first in her anus, then on the clit. She felt a huge orgasm was brewing inside her. But she was not promptly allowed to cum. As she more and more approached her eruption, the vibrations got diminished again. What a diabolical device she thought frustrated. Birgit had now been held for several minutes at a very high lust level by the vibrations who raised and ebbed away multiple times. Finally, the vibrating anal plug got stronger and stronger. Breathing heavily she lay in the water, her lust reached new heights. She wanted nothing more than that of vibrator would turn up and she would be finally delivered. But it was not just yet. Again, water was pumped in to her bladder, stronger and stronger the pole vibrated in her tight little ass. Hornier and hornier she became, as she could feel the vibrations throughout her whole body. Her breath came in short gasps, she writhed in her bonds and passed almost out under the immense desire for relief.

Again, the machine pumped more water into her bladder, the pressure finally catapulted her into a nirvana of pleasure and pain. Then, as she believed she could not to stand it any longer, and her lust turned almost into pain, she felt a super strong vibration on her clit. She groaned loudly, her lust was pushed to an extreme level and then she felt her climax approaching. Violent spasms made her youthful body tremble as she yelled out her incredible lust amongst the never-ending waves of her super orgasm.

It took minutes until she could recover her breath, the water had already been pumped out of her bladder and the vibrations had ceased long ago.

Birgit lay totally exhausted in her seat, enjoying the relief. The two sisters looked at each other, and this time both smiled brightly.

Simone came back after a few minutes, pumped the water out of the tub and released their bonds..

I hope you liked your day here in the clinic, she said, smiling.

You can go into the changing rooms now, I’ll see you off later on.

End.



[i][b]Please feel free to post comments or suggestions! Thanks![/b][/i] Edited November 29, 2013 by dunhill

[givememorethanone]

great story. I'm not a fan of enema so the story really start in the middle (so the second part of the original).
in the past, I had tried to read your story with google translate but it was very hard to catch. I hardly went to the end.
thanks for your effort about translation

[givememorethanone]

[quote name='givememorethanone' date='29 November 2013 - 06:34 AM' timestamp='1385703244' post='953997']
great story. I'm not a fan of enema so the story really start in the middle (so the second part of the original).
in the past, I had tried to read your story with google translate but it was very hard to catch. I hardly went to the end.
thanks for your effort about translation
[/quote]
just verified because I was not sure but this is the part 1 of the original. Part 2 is not included into translation.
Do we could enjoy reading the second part translated?

[dunhill]

[quote name='givememorethanone' date='29 November 2013 - 06:41 AM' timestamp='1385703692' post='953998']
Do we could enjoy reading the second part translated?
[/quote]

Its in the works.

[lordodie]

Editing this was definitely worth my time. I'm just happy to help bring the joy of the Two Sister's universe to the English speaking world.

[BlackrockBoss]

Thanks dunhill and Lord Odie for this excellent original and work and also for the English translation! Can't wait to hear how Birgit and Anita progress in their anal masochism!

[assgap]

Many thanks to you both for this story!!!! I am not a huge enema fan, but do occasionally involve it in my sex play. I must say that this story has gotten me hot and ready for some warm water deep and full!! Thanks again for opening my mind again to this particular sexual bent, and the hard assplay and cum that is to follow!!! Well done!!!

[assgap]

[quote name='assgap' date='06 January 2014 - 07:42 AM' timestamp='1389012167' post='987648']
Many thanks to you both for this story!!!! I am not a huge enema fan, but do occasionally involve it in my sex play. I must say that this story has gotten me hot and ready for some warm water deep and full!! Thanks again for opening my mind again to this particular sexual bent, and the hard assplay and cum that is to follow!!! Well done!!!(New bigger, better, deeper, enema equipment ordered!!)
[/quote]

[viperfan1]

Great story loved the extreme dilation and would love to hear how big she looked the next day and whether she has the ability to hold her bowels anymore.