FSE

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Cohen nervously climbed the steps of the clinic, his long grey tail low to his backside. Today was the day; after weeks of anticipation, of second-guessing himself for signing up for this study, he was finally here. He needed the money - the vibe coding boot camp had been a massive, expensive mistake, and rent was coming due. Still, he reminded himself that rent wasn't the only thing that would be coming soon.

He grasped the handle at the clinic's door, pulling the door open with his muscled furry hand. It wouldn't be so bad, he thought, just a quick donation and he would be able to go home and stop worrying about the money. "Two grand for just a few hours", the nice fox at the party had said with a wink. He'd signed up out of desperation, and admittedly, a little bit of curiosity. Why was a simple semen collection study paying so well?

As he passed through the door, he noticed a tan anthropomorphic mare seated behind a front desk smiling at him. She waved him in, and as the door closed, his hesitation lowered slightly.

"Mr. Cohen? Welcome to the F. A. Birb Memorial Clinic. You're a few minutes early for your appointment, so grab a seat and fill out these forms. They're almost ready for you."

"Thanks, these?", Cohen replied, accepting a clipboard with a few forms clipped to the top. He chose a random chair near the door, noting that the back was connected to the base by a single bar on the right to allow people to comfortably swing their tails into the seat behind them instead of having to painstakingly thread them through the way you had to in so many other establishments. That was a good sign - a sign that they catered to genetically modified people like himself instead of just baseline humans here.

He skimmed the paperwork - release of liability for the facility, release of liability on his part for his release, NDA, etc. After the first page he started skimming, seeking to the part where his personal details went and filling those out. After that, he had little to do but to sit on his paws and watch the clock.

After a few minutes of clock watching, he heard his name being called, and looked up to find the friendly face of a brown doe. The doe was dressed in a blue nurse's outfit and, he noted, appeared to be very well built. He tried to keep his eyes on her face, but he couldn't help but notice that she really did have fantastic breasts, and as she turned to lead him inwards into the office, a cute tail. She smirked, having noticed him noticing, and continued forward, asking if he knew what he was getting into with a wink. He liked her, he decided, as they passed a series of closed doors.

About 20 feet in, they turned a corner and headed down another hallway, passing a vulpine nurse leading an apparently blissed-out lizard man in the other direction. Cohen guessed he had been the previous patient. Soon, they arrived at an open door on the right, and the nurse motioned him in, explaining that her name was Rayna and she was going to be assisting him in today's "collection".

The room they entered looked a lot like a standard doctor's office, except Cohen noted that it was dominated by a reclining table with a series of straps and a very obvious pair of stirrups. A slight blush made it through the grey and white striped fur of his muzzle as started to imagine what the procedure would entail. Truth be told, he was still a bit nervous, but Rayna's presence was somewhat reassuring as she closed the door and began to explain the next steps.

"Today we'll be testing an experimental procedure to assess the way your muscles contract during ejaculation, as well as your seminal capacity. You can go ahead and remove your clothing", she explained, pulling on a pair of plastic gloves and opening a cabinet to begin gathering equipment. "As I'm sure you aware, you're going to be experiencing assisted orgasms, so modesty will not be required."

The reality of the situation, and the slight absurdity of hearing a medical professional so nonchalantly explaining that he would be coming soon, made Cohen tense up a little, but he also couldn't help but notice that her statement aroused him a little. Given what would be happening soon, he knew intellectually that there would be no point in hiding his arousal, so he shrugged and began to remove his clothing. First he pulled his shirt over his head, revealing a not-too-muscular but not overweight furred chest. Next came the belt, and finally the pants, reveling boxers that were just beginning to show a bit of a tent.

"You won't be needing those either", the doe noted, pointing towards his underwear. "You can put your clothes on this chair and sit on the edge of the table."

The wolf did as he was told, neatly piling his clothes on a nearby chair and hopping up onto the side of the metal examination table. The temperature was comfortable, although the table under him was a little cold, and he eyed the doe in front of him shyly, acutely aware that the very tip of his red member was peaking out from his furry sheath.

"Ah, good, looks like you're almost ready to begin", Rayna commented, moving to stand in front of him. "The first step will be a manual inspection of your genitals to ensure you are healthy enough to continue. We'll skip the part where I ask you to turn your head and cough if that's OK?".

Cohen nodded, blushing a little more intently and widening his legs slightly as the doe motioned for him to do so. Soon, her hand was reaching forwards, and Cohen could hardly believe things were moving so fast as the tip of her gloved finger found the end of his member. She seemed practiced and professional, lightly grasping the end of his penis at first and moving down to squeeze several points along his sheath. She worked her way carefully and clinically down to his furry testicles and gave each a firm squeeze, then turned away to grab a wooden tongue depressor. He was somewhat surprised when she inserted this into his sheath, pulling the skin to one side and actually dipping a finger in to feel around inside!

This got a reaction from the wolf, his member beginning to push out further as she continued her inspection. In a few seconds it was over, and she stepped back to record her results at a nearby computer.

"Looks good, Mr. Barraga", she noted. "We can proceed with arousal and begin phase 1. Please move to the foot of the table and lie back."

Cohen stood up and padded over to the end of the table, sitting down and noting that the inspection already had him at half mast. He looked at the nurse questioningly, wondering what would happen next and thinking that he should have paid more attention to the paperwork. He had expected that the procedure would be a little more... private, truth be told, but Rayna was both attractive and professional, and her presence put him at ease.

"Great, a bit further back. Now put your legs here.", the doe commented, The wolf obediently lifted his legs into the stirrups at either side as Rayna adjusted them for his comfort. He felt so exposed like this, never having experienced this type of examination before. Rayna grabbed a bottle of lubricant from a cabinet, and placed it on a table beside him.

"For this procedure, I'll be working you into a very high state of arousal and delicately manipulating your anatomy. In a moment, I'm going to strap you down. Let me know if you are uncomfortable at any point, and we will terminate the process.", she said, pointing out straps on the side of the table for him to place his arms into.

He looked a little stricken, but obediently moved to allow her to bind his wrists to the table beside him. After she completed this step, she wound a leather belt around each of his ankles, binding him to the stirrups, and then pulled a lever on the side of the table to spread his legs a little wider.

He gulped. The situation was an odd mix of sexual and clinical, and it felt a little awkward, but the doe in front of him was perky, professional, and planning to make him cum. It wouldn't be that bad, he thought, a few more inches of his pink member growing out of his sheath.

The nurse snapped him out of his reverie by gently pulling his tail down, strapping that in place as well, before reaching to the side to pump a dollop of lube onto her glove.

"I'm going to give you a quick prostate examination and prepare you for the probe we'll be using. Please bear down for me."

The wolf blushed and beared down as the doe pressed a finger to his tailhole, lightly but firmly circling around before pressing an inch inside. Cohen was no stranger to anal play, and she was able to slide in easily, her warm finger pressing forward to and moving in a gentle circular motion. She kept this up for a few seconds before pulling back and adding a second finger, the two digits spreading him wider as she pressed inside. Curling a finger upwards, she searched for and found his prostate, earning a tiny whimper and a noticeable penile pulse from the wolf. She pressed inwards on it, each motion forwards sending a small pulse of pleasure through the wolf's insides and into the root of his member, which was at half mast and growing. After a few seconds of this, right before the wolf would be fully erect, she retracted her fingers and he stared at her.

"Looks good - thank you for being clean back there today.", she noted. "I'm going to insert a small probe now, which will help stimulate you to full arousal and measure the electrical pulses within your prostate. It's not much bigger than my fingers", she said, bringing up what appeared to be a purple butt plug attached to a cable.

The wolf's tail twitched as she pressed it to his slightly loosened anus, gradually skipping it in, and as promised, pressing it delightfully up against his prostate.

"You're going to feel a light tingle now as the device brings you to full arousal. I'm going to help you with my hand while it does this. Just relax for me and let me know how you are feeling."

She replaced her gloves, added more lube, and brought her hand to his member. He felt a rush of pleasure as her warm paw gripped the end of his cock, caressing downwards towards his balls with a light touch. He was throbbing now, feeling a light tingling in his prostate, deliciously erect with veins just visible down the length of his firm shaft. His penis was 8 inches long, with a deflated knot at the base that would begin to inflate soon if she kept this up. She fully retracted his sheath, gripping the thing root of his cock and smiling at him, then adding a hand to begin to run the oh so sensitive tip.

A bead of precum escaped the end of his member, and she paused, reaching to the side to swipe a Q-tip from the side table and sampling the droplet before placing it in a sealed container.

"We like to get a sample at this stage of the process before you start adding semen so we can analyze it later", she stated, before continuing to squeeze him. He felt like he was in heaven. Suddenly, she pulled off, and opened a cabinet.

"Of course, if this procedure were a simple handjob we wouldn't be paying you so much.", she smirked. She returned with a strange looking contraption. The device had a series of thin tubes trailing from the end of what was clearly an onahole of some kind, and Cohen had never seen anything like it.

"Now that you're fully aroused, I'll be threading these through your prostate to your bladder and vas deferens", she explained. "This may feel like a foreign sensation at first, but bear with me and try to enjoy it - I promise you'll love the final result."

She lined a thin tube up with the head of his member, and slid the end a centimeter inside. At first it stung, but Cohen quickly adjusted to the feeling, the waves of pleasure from his prostate easing his concern as the doe carefully threaded more of the tube in. Inch after inch of tubing pressed through his throbbing tip, adding an alien sensation of being filled that traveled down his urethra and inside him.

"And... we've reached your prostate", she remarked, and he felt something inside him give way in a not-un-pleasurable way. "Now, I'm going to dilate you slightly and thread the next stage through."

She pressed something on the contraption, and to Cohen's fascination, he felt the tube growing slightly wider. He watched in fascination as the tip of his member opened slightly, and the doe threaded three smaller tubes down the length of the first. Soon, he felt the ends of these at the end of the first tube deep inside him. One tube pressed inwards and he felt a sensation of urinating as it breached into his bladder.

"For this next part, I'll be adding the remaining tubes to your vas deferens. Normally, the prostate maintains a seal to keep your semen separate from your urine, but with a little of the right stimulation..." She pressed something on the side of the base of the probe, and Cohen felt a tingle deep within.

"I'm using a targeted electrical pulse to manipulate your prostate into opening up for me in just the right way", she explained. The he felt it. It was almost like the sensation of ejaculating but backwards. A feeling of fullness deep within that normally accompanied orgasm, except it didn't pulse or go away, just stayed there as the tingling sensation of the probe turned off.

"And it's in! You now have a direct line in your vas deferens.".

The sensations were so strange, but it felt incredible in a way. The wolf panted as the deer pulled her hand back, smiling at him and giving his member a light stroke for good measure. The wolf noticed that the end of the tubes were stoppered, and the deer noticed him noticing.

"Now, I'm going to drain you of your urine first. Relax and clench your bladder for me.". The wolf did as he was told and a second later he felt the sensation of relief in his bladder as the doe unstopped the first tube and directed the flow into a container. She let it flow, and returned her gaze to him.

"And now I'm going to drain you of your semen", she explained nonchalantly, placing the end of another tube in a smaller container and opening a valve on the side. To the wolf's amazement, a new sensation deep inside blossomed as he watched a thin line of white make its way into the container.

"You're probably wondering why we aren't having you ejaculate that normally.", she continued. She reached down to tweak a button on the device connected to the anal probe, and with her other hand, gave his member a few strokes.

He watched dumbstruck, as the drip drip drip of semen from the tube turned into a more steadily flow, feeling a little like he was coming but without the pleasurable rush of an ejaculation, just a draining while being stroked and stimulated. It felt really good, but an orgasm it was not.

She finally placed a hand on his pelvis and pressed down, earning a final squirt from both tubes before both stopped producing liquid entirely. He was dry. He felt the emptiness of having come, but none of the ache of doing so and no subsidence of arousal.

She glanced down at the container of semen, and noted the level. "Not bad. Your ejaculatory volume after repeated intensive milking the traditional way today would have been 15ml. Needless to say, you're probably wondering when you get to come. That's coming next!"

The wolf cocked his head to one side. How was he going to come if he had been emptied out? The doe did not immediately answer his question, but instead turned to fetch another container from a cabinet. She returned, with a green liquid in hand.

"This gel simulates the viscosity of wolf semen and will allow us to artificially change the volume of ejaculate you can process. In short, you're going to come this today!". The deer smile at him and he gasped. This was NOT what he was expecting, but as she reached forward to continue stroking his member, her fingers trailing down to his sloooowly expanding knot, he offered no complaints.

"I'm going to start by measuring your maximum capacity, then dial it down to a manageable level and take you through a series of ejaculations." She detached the tube that Cohen's cum had traveled through from the collection container and attached it to the new container, placing it in a nearby IV stand. Cohen watched as the line of green traveled down the tube and into his cock, and then felt the stange sensation of his vas deferens filling back up. It was like coming in reverse and without the usual spasms, and after a few seconds he began to feel pent up. The sensation grew and grew, until finally it felt as if he had gone months without ejaculating and he was in rut.

She gently squeezed the container while stroking him softly, alternating between stimulating his rock-hard member and comforting him with strokes across his pelvis.

"You're doing such a good job. Looks like your max seminal capacity is about 12ml. You can hold so much!". The fullness was maddening, but it only lasted for a few seconds before she unhooked the container and brought it level with his member. Immediately some of the pressure leveled off as she allowed a little fluid to escape, then turned a valve on the side of the tube to hold the rest in. She transferred the tube to another machine, this one with a gauge on the side, and threaded the tip in before undoing the valve. Nothing escaped.

"This machine is going to measure the force of your ejaculations today", she explained. "In a moment, I'm going to stimulate you to orgasm, and then we're going to refill you. The process will continue for some time - try to enjoy it!".

She reached forward and stroked his member again before bringing the milking sleeve at the base of the tubes threaded into the wolf's member forwards, easing it over his tip and down to his half-inflated knot. She toggled a switch on the side of one device and the sleeve began to rhythmically contract.

Cohen was in a state of bliss. This beautiful nurse was working on him so dominantly, bringing him shattering pleasure, and he knew he was going to get close soon.

"I'll be monitoring the electrical signals in your prostate for each orgasm, as well as your ejaculatory pressure in response to a series of stimuli. I'm going to place some goggles over your eyes and show you some images while I do so."

She picked up what could only be described as a VR helmet and placed it over his face. For a moment, all he saw was blackness, before some text appeared.

"Beginning physical calibration."

He felt the device on his member squeeze down tightly, then loosen, then squeeze again, and heard the nurse typing away at a keyboard. Next, he felt the device loosen slightly and a vibration hit his prostate, pulsing again and again at various intervals. The vibration stopped, and he felt an electrical tingle there instead, his cock twitching furiously as his nerves were directly stimulated.

The typing stopped, and he felt the doe placing something tight around the root of his cock, almost like a blood pressure cuff, to simulate a tie for his growing knot. Then, the simulation stopped.

"Beginning visual calibration."

Images blossomed to life in the blackness. The first was of a female wolf standing naked before a camera, slowly raising one leg and reaching down to spread a dripping spade for all to see. The next was of a male wolf at full erection, throbbing before ejaculating. Every image brought a little pulse to his member as his desperate body responded to the arousing sights, and every response was recorded. Soon, different species were presented. A horse, a mare, a dragon, a dragoness, a stag, and a doe. On that last one, he throbbed especially hard, remembering the cute nurse in the room.

"Calibration complete, beginning orgasmic sequence" flashed on the screen, and vivid pornographic scenes appeared before him in 3D as he felt the devices go to town on his member. The milker pulsed and rubbed, the knot root cuff inflated, and the prostate massager whirred. The whole time, the nurse typed away, engrossed in monitoring his state.

After a few minutes of this he felt his orgasm approaching, finally, his internals tightening. He hit his peak, his insides clenching and spasming around the tubes and forcing the gel outwards into the machine rapidly, the sensation of ejaculating and tying the milker overwhelming him. He came and came, his knot inflating fully and pulsing as the sensations continued, until finally the heavy stimulation stopped and the cuff around his knot pulsed slowly, simulating a tie as he came down from his peak.

"That was very good. You ejected 8ml of simulated semen. Now we're going to measure the pressure of your post-ejaculatory cycle for 20 minutes, reload you, and go again.".

He felt the sensation of a warm blanket being placed over him and the images in his vision turned down from downright climactic to more intimate, first person shots of smiling partners and deep kisses. It was bliss. Every few seconds, his prostate clenched, pumping a little more of the gel outwards through his throbbing member. His knot was fully inflated and tied to the cuff, so being a wolf, he remained tied and continued coming weakly. A hand reached under him and gently bent his member backwards and away from him, simulating the back to back pose his ancestors would typically take after mating.

Fifteen minutes later, his pulses died down and he felt the pleasant ache of emptiness inside. His knot deflated, and the nurse lowered the pressure of the cuff at it's route and allowed his member to soften, still impaled by the tube.

"How are you feeling Cohen?", Rayna asked.

"That was great, I haven't come that hard in some time! Is the procedure finished?"

"Nope!", she replied, pulling the blanket from his body and adjusting some of the equipment. "Now, we're going to refill you and start again. We'll start with light arousal as your refractory period finishes up, and help you through a few more orgasms until you are tired out. Speaking of...",

The wolf felt a pressure deep within growing as liquid rushed back through the tube, turning the physical feeling of being spent into a feeling of being pent up again. The sensation was odd - feeling part of himself ready to go again while still experiencing the gentle ache of a recently exercised prostate - but not unpleasant.

Rayna finished adjusting the equipment, and brought a hand to his member, sliding the weakly-gripping milker off of him and running a finger around the tube in his urethra. "We aren't collecting your pre with this machine, and it's leaking out and lubricating the assembly nicely", she commented.

"We're going to start with calibrated visual imagery this time, and then introduce some gentle stimulation as your arousal increases."

The imagery in the visor changed, starting to play back a scene of a dragon male entering a female deer. She was gasping as his ridged member slowly spread her waiting slit, pressing inwards and slowly dragging back out as the camera alternated between their faces and lewdly displayed genitals.

"I see the system has decided you like deer. I wonder why that would be?", Rayna smirked. "I wonder, do you find me arousing? Does my voice make you harder?"

He throbbed, really getting into it. "You know, I think it does."

"Great, in that case I'm going to try talking you through this next part. You know, you really are a fine specimen of your species. Just relax and let me take care of you".

He felt her gripping the base of his member, squeezing slightly and using her other hand to run up and down the shaft.

"You're going to be such a productive wolf for me. A big predator, strapped down and dominated. The equipment doesn't lie, you like being dominated, don't you? I wonder if the response would be different if..."

She adjusted a some of the equipment before returning her hand to his member. "Do you like being called a big wolf, of a little wolfy? Ooh, you just reacted to that, good boy.".

"You're being a such a good boy. That's the reaction I'm looking for. A good buy who loves getting milked of all his pent up cum."

She switched back to her console and typed a few commands. Cohen felt the probe buzz to life gently, and the visor switched to displaying a deer in a nurse's uniform not unlike Rayna.

"Now I can't break my professionalism, but the AI controlling your visual stimulation can look like me. Let's see what she can do to help you be a productive little wolf for me. Ooh, you liked that, I can see the readouts from your prostate clenching, and your cute wolfie dick throbbing. You're a good boy, aren't you?"

Cohen was overcome with arousal, his member throbbing harshly again as he felt her gently tease a finger up and down his impaled shaft. It felt so good, and the sensation of the oanhole returning to his tip felt even better. The machine pumped him as Rayna talked him through his buildup. His visor alternated between showing lewd shots of deer milking various males and riding them. A male dolphin clenched and shot an arcing blast of semen as a deer shoved a purple dildo into him. A doe was impaled on a throbbing canine member, then a horse's. It never stopped, flashing from scene to scene as it honed in on what aroused him the most.

"You're getting close again, so let me walk you through this next part. I'm going to cause you to ejaculate again, and them I'm going to pump it all back in and replay the signals recorded by your prostate through the probe. You're going to feel an orgasm, but afterwards you'll keep contracting and the physical sensations will not let up as I replace your post-orgasmic cycle with subsequent ejaculations at variable resistance. Get ready now..."

His knot was swelling, and she cuffed the base again, giving his balls a gentle squeeze before turning the stimulation up to 11. He felt white hot pleasure as his insides contracted, launching the gel back down the tube and into the waiting machine. After the 5th shot his body tried to switch over to rhythmic pulses every 10 seconds or so, but instead of letting him push more cum out, the machine pushed it all back inside and held it there. The sensation was a little unexpected but not painful.

Then, all hell broke loose inside him as he *clenched*, feeling himself throb and shoot it out again as a sharp tinging entered his insides. She had manually triggered his muscles with the probe, forcing him to shoot again, and even though his pleasurable bliss was ending he noted the continued ache and pulse of ejaculation.

Again and again, he emptied himself, only to be filled up again immediately, his knot being rhythmically clamped as mating couples swam across his vision and she called him a good wolf. It was the longest climactic experience he'd ever had. After *minutes* of this, she finally let him relax, his abused prostate weakly trickling the remainder of the gel out and the machine no longer forcing it back in. He ached inside in a way he never had before, but in a good way.

She kept him tied with the cuff and rotated his member back downwards, putting the warm blanket back on him and removing the VR helmet. His vision swam as he looked up at her approving face, with such pretty eyes.

"You did a great job hun", she complemented. "I got a lot of good data today, and your prostate got a lot of good exercise. Did you know that if you come back, we can make your ejaculations stronger over time?"

He had not known that, but now he kind of wanted to experience that.

She gently stroked his chest through the blanket for a few minutes as he fully emptied his tubes into the now gently pulsing machine. He was blissed out and silent, enjoying the afterglow.

She took the blanket off and unhooked the cuff compressing his slowly deflating knot, and slid the onahole off of his member. Then, she adjusted a few dials on a nearby machine, and began to slowly pull the tube assembly from his spread urethra. The sensation of the tubes leaving his bladder and vas deferens was oddly pleasurable, like urinating and coming at once, and he felt the tips trailing out before he watched them leave the tip of his pointed red cock, trailing a thick string of precum. He felt her gently slide the anal probe out, and finally he sat up as she undid the straps holding his arms and legs down.

He wanted to hug her, to experience some physical intimacy after being so deeply fulfilled, but she was moving too fast, explaining that he had ejaculated 10 times and that the collected data indicated this or that. Honestly he was too exhausted to really get what she was getting at, and he dressed in a blur.

He walked behind her as they exited the room. She lead him back down the entrance hallway, and they passed a male dolphin leading a trepidatious looking male orca back the other way.

She left him in the lobby, giving him an approving smile and wave. The mare at the desk helped him set up his payment, and he left.

He would have to return, he decided.