5 comments/ 85303 views/ 49 favorites The Two Sisters Pt. 01 By: fantasywriter1 ©by fantasywriter. Translated from my german original story in co-operation with lordodie. Chapter 1: Prehistory 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. Chapter 2: Birgits defloration 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. Chapter 3: Birgits Follow-up treatments 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 Two Sisters Pt. 01 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. Chapter 4: Anita's confession 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. Chapter 5: Anita's training begins 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. The Two Sisters Pt. 01 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. Chapter 6: Enema Training 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. Chapter 7: Elucidation for Birgit 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. The Two Sisters Pt. 01 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. Chapter 8: Pressurized 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. The Two Sisters Pt. 01 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. Chapter 9: Birgit emulates her sister 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. Chapter 10: Pressurized Part 2 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. Chapter 11: Relaxation 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? Chapter 12: Second Day 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.