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.