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Pavel wandered down the corridor, the scent of hospital in his nose. Room B213, B215, B217. All the doors were closed and displayed a red "occupied" sign except the one he'd been told to find. He paused at the entrance to room B219 and peeked in. No-one home. Against the wall there were some chairs and a small table with magazines on it. He could see no further than a large, curtained-off area a little way into the room.

He was about to pad in when he caught a faint sound from next door. Looking about and finding the corridor clear, he leant his ear closer. There was the murmur of voices, and was that..? Yes, it was. The sound sent a shiver up his neck; it was heavy breathing. His large ear almost touched the door as he strained to hear more, eyes widening.

A sudden noise from the end of the corridor sent the fox's tail rigid, and he dodged into B219 and fished around for a magazine. He crossed his leg and pretended to read. Shortly afterwards a portly lynx clutching a clipboard appeared at the door. "Pavel Voss?"

"Yes?"

She smiled and bustled in. "You forgot to sign this bit." She tapped her claw next to a paragraph, which Pavel scanned. It said something about permission for the presence of research personnel. Not in the mood to argue, he signed it and held out the clipboard.

"Thank you. The doctor should be in to see you any min - oh. And here he is!" She flashed the form at a tall, white-coated lemur, who nodded, watched her disappear and then swished the door closed behind him, his long tail well-rehearsed in dodging the danger.

He plonked himself in a desk chair and rolled over to Pavel, holding out a long, slender paw. "Pavel, hi. I'm Thomas. Nice to meet you. Thank you helping us out with our research project."

"Sure...well - I kind of need the money," Pavel replied, shaking the doctor's paw.

"Yes, the money is quite reasonable for just an hour of your time, isn't?" Thomas chuckled. "Well, I see you've signed all the forms so you should know what's going to happen. I will ask you to remove all your clothing in a minute, but before that, if you have any questions or concerns, just ask."

Pavel scratched his whiskers, ears askew. The sounds from next door still echoed in his mind, but all he could think of to ask was: "Um, will anything hurt?"

"Some volunteers experience mild discomfort at first. That disappears rather quickly."

"OK," he replied, suddenly feeling a little more nervous.

The doctor watched him for a moment, then stood purposefully. "So, if you could get undressed while I set a few things up." He drew the curtains back to reveal a big, black padded chair, lined down the middle with paper, over which hung a large medical lamp. Near the middle of the chair was a short break in the material, and then the chair continued straight on divided into two parts, matching where the fox guessed his legs would rest.

As the doctor rattled around with a tray, Pavel turned away and pulled off his t-shirt first, revealing a firm chest covered in thick, white fur, which shortened as it approached his tight belly. He slipped off his jeans next and paused, thumbs hooked into his briefs. He looked over his shoulder at the doctor, who caught his glance and nodded faintly. Pavel turned away and pulled them down, stepping out of them gingerly and dropping them on the chair with the rest of his clothes. His tail tucked itself under him instinctively. Pavel wondered if the doctor had noticed. He reached out for his tail and drew it up between his legs, over his crotch, pretending to have noticed something caught in his fur. He turned around and wandered over to Dr Thomas, who surprised him by letting out a loud laugh.

"Pavel, don't look so horrified. It'll be over before you know it. Now," the lemur patted the seat, "Please take a seat."

Pavel settled into the chair, and sat forward, hugging his knees and tail to his chest. The doctor turned and leant on the edge of a table that supported a keyboard and a number of computer monitors, all off except for one. He adjusted his glasses.

"As you should already know, in this test we will require some feedback from you. You don't have to say much; just let me know if you have reached a stage you would describe as...orgasmic." Thomas smirked kindly. "And of course, you will not experience ejaculation during this procedure, but you will get an erection. And that's pretty much it. All you have to do is lie back and answer the occasional question. Happy with all that?"

"I guess so," Pavel replied, fiddling with his tail tip.

The doctor moved to the foot of the chair and held out his paws. "OK, give me one foot at a time then."

Ears flat back, Pavel extended his right footpaw. He was self-conscious about his footpaws because they were rather large. His ex had loved them, referring to them as generous, but that only made him feel more aware of them. What made it worse was that the doctor was cute. There was something about those brown eyes, that smile. His face started to feel warm.

The doctor fastened a padded belt around his ankle, and then clipped it onto a loop on the chair.

"Next," the lemur said.

"This is so I...don't go anywhere?" Pavel asked as his second footpaw was strapped up.

"Just standard procedure. Same for your wrists now, OK?" The doctor fastened them to the arm rests on the chair. "Fine. Now...where have they got to I wonder? I don't want to start without them."

The fox perked his ears. "What? Who?"

"The research students." He tapped his watch. "They should have been here five minutes ago. Let's give them a minute more."

Pavel sat upright. "Research students?"

"Yes," said Thomas slowly. "You're not getting cold feet are you?"

"They're coming in here? Now?"

"Look, there's really no need to be embarrassed -"

"Hold on. I'd rather they didn't watch me if it's all the same to you."

"They need to. You signed the form. Look, don't worry, you'll be fine."

Pavel tugged at his wrist restraints. "I'm just not sure I want them watching. I'd rather do it without an audience."

The doctor sighed. "Well, if they can't watch, we can't pay you I'm afraid."

There was a knock at the door. "Wait!" Thomas called out, and aimed an enquiring look at his patient. The fox paused for a good few seconds. He'd thought this would be a quick thing. Informal, easy money. And yes, he'd fantasised about it a little too. He liked the idea of being paid to feel good. But bound to the chair, it suddenly seemed a bit too real. And an audience? But no - he couldn't back out now. He really needed that money. Blowing out through his lips, he flopped back into the chair. "Alright, fine. Let's get this over with."

Thomas patted his leg and smiled. "Don't worry, you'll be fine." He turned his head and called out, "Come in!" The door clacked open and in filed some rather young-looking students. Pavel glanced at them uneasily. A wolf, a rabbit, a kangaroo, all males...wait...now a female mouse, and a female fox. He looked away and felt his skin turn bright red under his cheek fur and inside his ears, even as he heard yet more sets of paws entering the room.

"OK everyone. This is Pavel, who's very kindly agreed to participate in our study. Let's get this out of the way first - this is naturally a situation that can cause some embarrassment, but there's no need. So, Pavel, these are my students..." He presented them with a flourish of his arms.

"Hello," Pavel managed, trying and failing to keep his ears up.

"And class, this is Pavel." The group gave him some generally cheery hellos.

The doctor addressed his students now. "Today we will be performing procedure 2c. As you can see, the subject is a red fox; aged 22, good state of fitness, no known complicating health issues. Now, pay careful attention to each step and make notes if you have to. Step 1."

Thomas sat at the desk and clicked a button. The chair jerked into life, and Pavel felt the backrest lowering until he was lying flat. Then the chair moved upwards and came to a halt. The leg rests started folding towards him, bending his knees and bunching them over his hips. Then in the final motion - Pavel knew it was coming - the leg rests rotated outwards, completely exposing his groin. They came to rest just as he felt a little stretch in his thighs. The fox stared up at the ceiling helplessly, and tried to concentrate on breathing slowly.

Thomas flicked on the light and aimed it between Pavel's legs. "Step 2. Red foxes have long tails that like to move around a lot. So -" His slender paws wound some bandaging tightly at the base of Pavel's tail, moving outwards until about a third of the tail was wrapped. Then a velcro strap went around his tail and got hooked onto a loop on the underside of the chair.

"Now, step 3, and warn your volunteer before you do it. Don some gloves, and then give his pink areas a clean, like so."

Think clean thoughts, thought Pavel, as warm, wet fabric brushed against his pucker, causing his tail to strain involuntarily against its ties.

"And now take another wipe, and pull his sheath open gently and clean thoroughly inside, especially around the urethral opening."

A warm, smooth cloth invaded his sheath and rubbed around. Pavel held his breath and curled his toes as it probed into every corner of his sheath, and felt a twinge at the base of his penis as it started to wake up. The cloth rubbed his tip, over and over, and he could feel himself swelling, but willing himself not to. Which was silly, Pavel realised, considering the nature of the experiment, but nonetheless he felt embarrassed to lose control of himself in front of strangers.

Thomas flung the cloth in a bin. "Now we're ready for step 4. We introduce an electro-stimulator to the subject's prostate via the rectum. And...this is what it looks like."

The doctor showed a blunt-tipped cylindrical probe to the students, about 8 inches long and an inch or two thick at its widest point in the middle. He turned to Pavel and showed it to him. "This is the device that does most of the work, Pavel. You may feel some mild discomfort as it goes in but this will soon fade, OK?"

Pavel nodded, and squirmed slightly as the doctor took a seat at his tail end. The size of that thing seemed to him like it would cause more than just mild discomfort. The doctor held his balls out of the way and squeezed some cool gel onto his hole, and worked it around and a little bit inside him. Then he felt firm pressure at his entrance.

"Bear down a little for me, Pavel. That's it, very good."

A warm pain started to grow under his tail, and he gritted his teeth as the device slipped in, further and further. He grunted a little.

"That's it, OK, very good," the doctor reassured, as he pushed the widest part inside. The fox's ring stretched taught, and then closed gratefully around the tapered end of the device. He felt very full and had an urge to push the device out.

"Now then, come over here - can everyone see the monitor? Good. So this is the initial setting. Just switch it on like so. There, done. The volunteers don't feel anything happening directly. The current is extremely weak. But what it will do is...well just watch."

Pavel could feel everyone's eyes on his privates, although he didn't look up to check. It was true, he couldn't feel anything physical, but his sheath was getting plumper and his pointed tip was beginning to poke out proudly. He blushed and hoped it was the device doing it and not his own mind. He stole a look at the group of students and met one of their gazes. Flattening his ears, he smiled pathetically and soon after opted to examine the ceiling again.

In the awkward silence that followed, he felt himself getting harder and harder. His pink tip pushed into his fur as it edged closer and closer to his belly button. He began to feel a bit uncomfortable as his knot started to stretch his sheath, and he couldn't reach down to help it out. The large device inside him was starting to feel good though, pressed bulkily against his prostate. He tensed around it experimentally and was rewarded with a small surge of pleasure. Yes, it was definitely the device that was doing the work.

"With canids," Thomas said, positioning himself between Pavel's legs, "you often have to help them out of their sheath." He teased the fox's sheath back, and his shiny, red knot popped out, instantly swelling even further. Pavel blew out a small sigh of relief as his cock flopped out heavily onto his belly.

"As this is experiment 2c we will be measuring the vasodilation of the penis as it varies with current. The apparatus is extremely accurate. Ordinarily we would use this one." Pavel tried to follow what the lemur was pointing to, but couldn't quite see. "But," continued the doctor, as he turned back, "in this case we are going to use the one that we usually use for horses, because as you can see, he's quite a big boy." He picked up Pavel's heavy meat and showed it to everyone, as if it needed further demonstrating. Pavel's ears flicked and flushed a little.

The lemur began squeezing his shaft, as if milking him. "What we are waiting for is the first emission of pre-ejaculate. Ah yes, here we are." Everyone watched as a glob of clear fluid formed at his tip and stretched down into his fur. "This serves as the lubricant for step 5."

The doctor pulled a wheeled tray closer to him with his footpaw and picked up a long, thin and flexible device. He flicked a switch on it and a tiny light came on at the tip. "It's a little wider than I'd like, but I don't think the other one has enough length to get to his prostate." Behind him, one of the monitors flickered into life and displayed a distorted view of the room.

Pavel pricked up his ears as the penny dropped. There was no time to object however, as the doctor swiftly lined up the tip of the device to his pee hole and pushed it inside.

The fox instinctively rocked his hips away as the tube slid in mercilessly, a centimetre at a time. He closed his eyes, let out a frustrated little whimper and scrunched his toes up as it got deeper and deeper, willing it to stop.

It did. He opened his eyes to find Thomas looking at him with some concern. "Are you alright, Pavel? Does it hurt?"

"Uhmm...not really, it's just...I wasn't expecting this."

"It's OK," the lemur smiled reassuringly. "We're almost there. You can watch the screen if you're not squeamish. That's what you look like inside."

Pavel glanced at the display, full of engorged veins, disappearing into a black hole in the centre. The camera started moving forward again and he whined quietly as it stretched its way down his length. After what seemed an age, it finally stopped, somewhere deep inside him. The doctor hung the device from a hook directly above his groin, and then clipped a padded ring around the base of his knot, which supported him and kept his dick pointing upwards. Pavel felt thoroughly invaded. Glancing down his belly, the sight of himself strapped up in such an undignified position sparked a flash of anger. How could he have let himself get humiliated like this?

"And that is how you prep a canid for 2c. Any questions?"

The vixen raised her paw. "What's that ring for?"

"The probe is flexible, but it can be uncomfortable at certain angles. Anything other questions? No? OK, then. So Vanessa, you can turn up the current. Go direct to 4. Yes, that's it."

A warm tingling engulfed Pavel's entire pelvis, and he felt his hackles rise. He tensed around the probe in his ass, and his dick tugged at the tube, making it sway from side to side. The warmth intensified and he squirmed slightly in pleasure.

Thomas pointed at a wolf. "Alex, can you move it up to 7."

Pavel gasped as the muscles inside him rippled, pumping him with a sensation that welled in the middle of his hips and seeped up into his belly. His cock gave a long, hard tense and suddenly his groin felt tight. His breath started whistling through his nose and he clutched at the arm rests, ears flat back in pleasure. His earlier discomfort faded from his mind as the delicious feeling grew. As the intensity reached a peak, he felt like he was somewhere close to coming, but not quite at the point of inevitability. The feeling never backed off, and he didn't want it to.

"Craig, could you try setting it to 9? I think that may be about right. Watch carefully. And Pavel, be sure to tell us if you experience what feels like an orgasm."

The fox gulped and nodded, not entirely focussed. His chest began to rise and fall faster as the student upped the current. A wave of pure erotic euphoria surged through him, and he arched his back helplessly. The muscles in his hips weren't responding to his own will any more as they clenched and held around the probe hard, oozing pleasure into him. How far a student moved a cursor...that was all it took to make him feel like he was in heaven. And all the while his classmates watched on, witnessing - no, scrutinising - his private feelings, his scent of arousal, his involuntary panting. But it felt so good, he didn't care. Muzzle drawn back in a snarl, he humped at the equipment, climbing higher and higher as floods of endorphins coursed around his captive body.

Then suddenly a dense tingling sensation gathered in his hips, built and built, and finally exploded. He spread his toes wide and failed to suppress a deep groan of pleasure through his nose as the familiar feeling of orgasm overtook his body.

"Yes," Pavel huffed, ears flat back. "Yes, now."

"Thank you Pavel." The doctor patted the fox's paw. "Please tell me when it drops off."

Warm pressure swam around at the base of his cock and then pushed its way up his spine, throwing him even higher into the clouds. "It's...not stopping..." he panted.

The doctor watched him for a long moment. "7 again please," he called to the students, finally.

The fox became limp as he descended from his peak of pleasure, pre streaming from his tip and pooling under his knot.

"Look at that data. Excellent, I think we should use a wider instrument more often. Great results."

"So is that the end?"

"Oh no, of course not. We'll bring him to 9.3 next. We need to study the effects at different currents. We need to know what's too little or...too much."

Pavel's afterglow was replaced by a wave of excitement as the device ramped up again. This time he willed it to take over his body, and very quickly, he got his wish. He moaned desperately, heart hammering, as euphoria twisted in ever-changing shapes around every corner of his body. It was unlike any orgasm he'd ever had. The endless bliss, flowing like light around his balls, his chest, his toes. It felt like he was in a different place. He gazed upwards. Everything seemed a little hazier and whiter. It was so...no there weren't any words. Just pleasure.

---

Pavel's eyes flicked open. He felt extremely relaxed, and for a moment didn't know where he was. He was brought to his senses by the feeling of something sliding out of his cock. He looked around; the students were gone. Thomas perked his ears. "Oh, hello there. You blinked out for a moment."

"Oh yes...mmm, sorry." The fox went to rub his eyes but the restraints were still in place.

"It happens quite often actually." A large volume of pre tumbled out and soaked into his belly fur as the long tube exited his member. The doctor next pulled at the probe in his butt. "OK, brace yourself, this may not be pleasant." Pavel gritted his teeth as the probe stretched its way out, and sighed in relief at the empty feeling left in it its place.

The doctor came to Pavel's side and wrapped a paw lightly around his still-rock-hard member. He slicked his smooth fingers up and down through the copious pre, sending tingles through the fox's loins.

"Now...one side effect of this test is that it can take a terribly long time for erections to go down. Unless..." He slid his wet paw down onto the glistening knot, and gave it a teasing squeeze, studying the fox's face.

Ordinarily, Pavel would have been creeped out by such an offer, but right at this moment, he could think of nothing he wanted more that this lemur's paws on him. He gave a little nod.

Thomas grinned wordlessly and wrapped his fingers around the throbbing knot, pulling at it and working his slick paw up and down. With his free paw, he spread his fingers through the fox's thick, white chest fur, tickling him with his claws and brushing delicately over his nipples. Pavel bared his fangs, already close, and let out a guttural growl as exquisite pressure started to build behind his knot.

"That's it, fox. Let it all out." Thomas worked his paw up and down the fox's engorged cock while his other paw cupped his balls and rolled them around gently, even as they started to tighten up. Both paws now moved onto his manhood, one holding his knot hard, the other slicking up and down over his over-stimulated flesh. It was too much for Pavel, and he pushed his hips up as far as he could, his tail restraint clacking against the table. Letting out a long, pent-up moan, he shot his seed high out onto his chest, shuddering and muscles rippling. Long strings of sticky white semen landed heavily on his chest and belly, aimed by a pair of tightly-gripping paws.

He could do nothing but pant as the doctor dabbed at the mess all over his torso with a paper towel. "I'm afraid," Thomas began with a shrug, "That there is only so much I can do to clean you up."

"I need a long shower," Pavel replied.

"Stat." He binned the sticky paper towel and rested his paw on the fox's tummy, smoothing his fur with his thumb.

Pavel quirked an unsettled eyebrow. "Were you...planning to let me go any time soon?"

The doctor chuckled. "I suppose so." Reluctantly, he freed Pavel's wrists, then moved between Pavel's legs and snipped the bandaging off his tail, which sprang into life immediately. Thomas took hold of it and held it up, then pressed a button that caused the chair to reset itself to its original position, the leg rests closing together. He moved to the fox's footpaws and gave them an indulgent feel, causing Pavel to wriggle ticklishly. "It's such a shame to release these. Oh well..." He unbuckled the fox's ankles and stood back, arms folded. "You can collect your money at the front desk. Thank you for your participation."

Pavel rubbed his wrists and stood. "My pleasure." He went to his clothes and pulled them back on, aware that Thomas was watching him. When he was dressed, he moved towards the door, paused, and raised a paw. "Well...goodbye then."

"Wait -" The lemur fished around in his desk and drew out a card. "For if you have any further questions." He gave Pavel a little grin.

Pavel took it and returned a rather similar smile. "Thanks. If I do, I'll call."