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.