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Aaron regained consciousness groggily, his senses returning one by one.

First came the coldness of steel, pressing against various regions of his body, matting the fur down uncomfortably. Next, he became aware of sounds and scents, which provided a brief foreshadowing of his surroundings -- the environment smelled almost too clean, overly sanitized, much like a doctor's office. The lack of sound was unnerving. Despite his best efforts, the German shepherd's acute hearing was unable to register any noise besides the minute shuffling of his limbs as he struggled to determine where he was.

Most alarming of all was the sudden realization that his body was completely devoid of clothing. His fur felt bare in the slightly chilled air, with nothing making contact with his body besides the steel. Aaron's eyes snapped open, but they were unprepared for what they were about to behold. He blinked, struggling to banish the blurriness from his eyesight as he became accustomed to his surroundings.

He was sealed in a relatively small room with blank, white walls. At least, they appeared blank before further inspection; Aaron suddenly noticed that the wall directly in front of him consisted entirely of a massive TV, its screen displaying nothing but a blank background. "How much did something like that cost?" he wondered. Then it struck him that he had much more dire matters to be concerned about.

He was situated upon a flat, white table located in the direct center of the room, which was just large enough to accommodate his body on all fours. That was exactly the position he was in, despite having been unconscious and limp, because he was restrained in place by several mechanical devices. All four paws were shackled to the table, while his torso, thighs, and upper arms were encircled by large metal rings, each of which were attached to robotic arms that extended down from small openings in the ceiling. Another of these rings was clamped around the base of his tail, lifting it high in the air so that his rear end was entirely exposed to the chilly environment.

Aaron was locked into place on a table, in a foreign room, completely vulnerable and unable to move much more than a finger. Which would be justifiable cause to panic for nearly anyone, and so... Aaron panicked.

First came the screaming and thrashing, but it was utterly unsuccessful. The German shepherd attempted to break the steely restraints of the metal rings by throwing his body in various directions, but he couldn't get enough leverage to budge so much as an inch. After a few weak endeavors, he transitioned to yelling frantically, in the hopes that some friendly individual was nearby and would come to the rescue. Unfortunately, this was not the case. Aaron screamed himself hoarse, shouting profanities and cursing the very souls of the bastards who had brought him here, and yet nothing happened. He remained shackled to the table.

Panting, Aaron halted his resistance. His limbs were already sore from chafing against the unforgiving metal, and the room appeared to be sound-proofed enough that no one outside it could hear his cries. He couldn't hear any noises from outside of the room; it was utterly silent, save for his ragged breathing.

The thought occurred to him, How the hell did I end up here? The last incidence that Aaron could recall was downing a beer at the bar with a couple of his buddies. He'd only had two drinks, not nearly enough to knock him out. Had one of his drinks been drugged? If so, who did it? And what had happened to his friends? One of them, a husky named Chad, had acted a bit strange all night, but he trusted Chad without a doubt. He'd known these friends since he was a small pup, they never would've betrayed him to... to whoever was currently holding him captive.

The anonymity of the individuals responsible for this was beginning to irritate the German shepherd. Couldn't they at least reveal themselves to him, or give him some information? Perhaps the most terrifying aspect of his predicament was that so many details remained unknown. He was unquestionably at his captors' mercy, and he had absolutely no idea how or why he'd been brought to this eerie room.

Aaron wasn't to be kept in the dark for much longer, however. After a few suspenseful moments of pondering his fate, a voice abruptly resonated from what appeared to be a hidden intercom. The German shepherd's sensitive ears snapped up in surprise and he strained to determine the location of the device, but there was no obvious source. The sound appeared to have no origin; it simply sprang into existence and echoed about the room.

"Good evening, Aaron," the voice stated cordially. It was male, and so calm and lacking any semblance of feeling that Aaron instantly wanted to strangle the individual to whom it belonged. It was all business for this person. So it's evening? Aaron wondered. That means it's been almost a full day since I was at the bar... And it suddenly, with a pang of fear, it occurred to him that they knew his name. This wasn't a random abduction. It had been premeditated. He had been targeted, and he was here for a reason.

"I'm sure you have a plethora of questions," the anonymous voice continued flatly. "Unfortunately, it is not our responsibility to address your concerns. You are here to partake in our experiment, which shall commence in approximately one minute."

Aaron was so stunned that it took his brain a moment to process what he had just heard. Experiment... His head was swimming. Judging by his nudity and the fact that he was restrained in place, he could only assume that this "experiment" involved something sexual. Furthermore, he couldn't imagine a busty female suddenly strolling into the room with the intention of getting him off as pleasurably as possible. No, something unpleasant was going to occur, and Aaron felt absolutely terrified.

He resisted the urge to thrash against the metal rings once again, if only so he could discern what the voice informed him of next. "We are an independent laboratory heavily invested in developing sexual products. Currently, we are testing a potent pheromone that appeals exclusively to male canines. We believe that this drug has incredible capabilities in its present form, which is why patients are required on which to experiment. That is your purpose." ...Pheromones? Purpose?

"You will be supplied with pornographic material," the voice stated. "If all goes as planned, you will be released after the conclusion of the experiment." It mumbled something away from the intercom, as if speaking to an associate. It addressed Aaron once more, sounding more like the operator of an amusement park ride than a scientist: "The experiment will now commence. Please remain calm and relaxed for your own safety."

As if in response, the TV-wall suddenly blinked into existence, its immense size dominating the entirely of Aaron's vision. Upon the screen, a video clip of an animal mating display began playing; however, rather than one male and one female, as one typically observes in the animal kingdom, this participants of this video were both quite obviously male. A feral wolf strolled up to his companion, the red tip of his shaft protruding from its protective sheath, and brushed up again him in a romantic gesture. The other male responded by placing his muzzle underneath the first male's tail, breathing in his scent and licking at his hindquarters.

Aaron was puzzled. He'd never felt much of an attraction toward other males, and though he'd entertained the possibility of experimenting with another guy during college, he'd never actually done it. Why were they showing him videos of homosexual animals? Did they really think that it would get him aroused? Sex was far from the German shepherd's priority at the moment, as his heart was pounding like a jackhammer and he wished fervently for some sort of escape route to appear.

A faint hissing became evident in the background, barely audible due to the wolves' excited yipping in the video. Aaron struggled to shift the mating scene to the back burner as he searched for the source of the disturbance. Much like the intercom, he could discern no obvious origin, but... Is it getting hazy in here? A translucent cloud of what appeared to be white vapor was accumulating near the ceiling, slowly drifting down to Aaron's level. It spread out and dissolved as it extended to the far corners of the room, so that once the hissing finally ceased, the room appeared just as it had. If Aaron hadn't witnessed the introduction of the haze, he'd have no idea it was ever present.

His eyes bulged in alarm as he was suddenly struck by the truth: It's the pheromone! It had permeated everything in the room, and he'd breathed it in. He was already participating in their experiment, despite being terrified and unwilling. The German shepherd made a silent resolution that he wouldn't allow himself to be affected by the drug they'd surrounded him with; he wouldn't give these bastards the satisfaction of knowing their experiment was successful. If he remained focused, he could ignore the animals mating on the TV wall. He'd be impervious to the wolves yipping excitedly as they engaged in a frenzy of sexual activity... The dominant male now mounting his fellow male, his ruby-red cock glistening in the light... The bottom wolf whining eagerly as his tailhole was stretched, penetrated thoroughly by the tapered length that was now sliding slowly into his sensitive orifice...

Huh? A hint of arousal had crept its way into Aaron's mind. He shook his head, willed himself to ignore the wolves' frisky activities... but he couldn't deny that he was beginning to feel faintly attracted to the pornographic display that currently enveloped his entire field of vision. The top male had now hilted in the bottom's rear, the full length of his thick shaft buried in warm flesh. Without even realizing it, Aaron's tip had begun to protrude from his sheath, hanging limply above the smooth, white surface of the table. A drop of pre formed at its apex as Aaron's concentration remained devoted to the video, spurred on by the rhythmic thrusting that the wolves had now engaged in.

Why does this feel so... alluring? Aaron wondered as he observed the two males mating vigorously. I was never attracted to this before... I've always liked women. Why... His thoughts trailed off as the wolves began thrusting faster, both of them clearly enraptured in the throes of their sexual forays. The bottom male's shaft was hanging almost completely out now, with a slight bulge present at its base as his knot began to swell while still concealed in its sheath. The top male closed his eyes, simply enjoying the rhythmic slapping of his thighs against his partner's furry backside, their balls touching occasionally and they swung back and forth with the momentum of the wolves' movements.

Aaron's head was swimming now. He had forgotten about the pheromone. He had forgotten why he was here, in this foreign laboratory, observing animals mating on an enormous TV. He'd stopped paying attention to the fact that he was restrained on a tabletop, completely nude, for all that mattered was the fact that his shaft was free and lengthening rapidly as he became more and more absorbed in the pornographic display on the wall. He was almost oblivious to the faint grinding noise as two panels on the ceiling slid aside, revealing twin mechanical arms that quickly extended downwards to the restrained German shepherd.

He didn't even realize that something was different until he was suddenly presented with a cock. But wait, no... it wasn't a cock. It was a dildo, a makeshift penis; it appeared to be fashioned out of some sort of rubbery material, and it smelled much like the mist that had permeated the room. Aaron glanced upwards and noticed that it was connected to a mechanical arm, which had adjusted itself so that the cock was aligned perfectly with Aaron's muzzle. Hmm... interesting, was the only thought that Aaron's drugged mind could muster. It didn't even occur to him that the dildo was coated in the same pheromone that was currently amplifying his libido.

A faint noise behind him made Aaron glance toward his exposed rear. Another cock was located there, hovering a few inches from his exposed tailhole. Typically, Aaron would have been incredibly alarmed even if the cock was attached to another person, but something about these rubber toys seemed... okay. There was nothing sinister about this situation; he was feeling rather aroused after all, and his predicament was becoming increasingly more pleasurable. All of Aaron's worries were swiftly evaporating.

His attention shifted back to the TV screen. The wolves were really getting into it now, with the top male applying more precise, labored thrusts to his partner's tailhole. Both canines squinted their eyes as they allowed their tongues to loll out, and judging by the fully-swollen knot of the bottom wolf and the amount of pre dripping everywhere, both of them were immensely enjoying the action. Aaron's cock was almost fully-hard now as well, and the urge to engage in sexual activity was overwhelming.

The cock in front of his muzzle began edging forward, approaching his nose slowly; likewise, the cock behind him crept toward his vulnerable tailhole. Aaron kept his eyes focused on the TV screen, observing the progress of the rubber cock in front of him through his peripheral vision. As the cock reached the tip of his muzzle, his lips parted immediately, as if they had a mind of their own. He clamped down upon the rubber cock, nearly its entire length concealed with his muzzle, his tongue resting along its bottom side and the pointed tip just barely grazing the back of his throat. Instantly, he felt an increase in arousal as the sweet, musky scent of the pheromones assailed his sinuses. A slight pressure accumulated at the base of his tail as something pressed lightly against the sensitive flesh. It felt as if it had been coated in something sticky, possibly lubricant.

Aaron was still captivated by the video. The wolves were close now, he could tell. The top wolf plunged his shaft into the bottom male once more, and then again, deeper this time... The German shepherd watched with bated breath as the top male slowly extracted his shaft from his partner once more, hesitated for a brief moment, as if delicately positioning himself... then shoved his entire length in, knot and all. The bottom wolf's tailhole stretched immensely as the bulbous intruder forced its way through the abused orifice, ribbons of pre gushing out onto his backside. The bottom male gasped in shock, releasing a strangled yelp, his cock twitching and spraying the ground beneath with wave after wave of cum as he rode out the ethereal throes of his orgasm.

Right at that moment, the cock at Aaron's tailhole made its move. Slowly, delicately, it inched forward, parting the layers of flesh as it sought entrance to the German shepherd's rectum. Aaron flinched as a sharp pain lanced through his midsection, emanating from the virgin muscles of his anal passage. He realized that he'd just bitten down on the cock in his mouth, and although his teeth hadn't caused ay damage, he felt slightly guilty with the realization that he could have caused some serious carnage had the cock been attached to an actual person. The agonizing pain of penetration slowly faded into the background as the rubber cock slid further into Aaron's previously unexplored ass, aided by the lubrication present along its length. Aaron's cock was now fully-hard, bobbing up and down beneath his torso as a stream of pre dangled from its tip.

Aaron released the breath that he didn't even realize he'd been holding and turned his attention to the cock in his mouth, which, as if on cue, began slowly pistoning itself in and out of his muzzle. Simultaneously, the cock in his rear initiated its escape from the confines of his rectum, still traveling at the painstakingly slow speed at which it had penetrated him. The German shepherd had no qualms about sucking on a shaft, nor being skewered by one; the pheromones had completely released his inhibitions and transformed him into a sexual deviant. His own shaft was throbbing mercilessly, demanding attention almost as if it felt left out of the action.

His tongue explored the shaft in his muzzle, which he noticed remarkably resembled a legitimate canine penis; the shape was accurate, he could discern a tiny bulge were he assumed the knot would swell later, and it even featured a few realistic veins that wrapped about its length. He suckled on the tip, fantasizing that the cock was attached to another canine, a sentient being whom he could use his mouth to please. As the cock behind him began pushing back into his rear, a little faster this time, he focused once more on the video.

To Aaron's surprise, the mating scene had now altered to something completely different. Now, a Dalmatian and a border collie, both anthropomorphic males like himself, were depicted undressing in what appeared to be their bedroom. The Dalmatian's boxers slid to his ankles, arriving at the floor in a crumpled heap while simultaneously revealing a marvelous, glistening shaft, already fully-erect. The border collie was sprawled across the bed, his boxers wrapped around his ankles, devoid of any other clothing with his own throbbing erection resting against the soft fur of his belly. As Aaron observed, the Dalmatian leaned over the bed and gripped the border collie's boxers in his teeth, pulling them off and releasing them over the side of the bed. He clambered onto the bed and leaned over his partner, his cock dangling just above the border collie's erect member.

At this point, Aaron had completely given in to the sexual impulses that were overriding his thought processes. The cock presented before him was steadily gaining appeal, and he focused upon it with increased vigor, allowing the mechanical arm to thrust the rubber phallus all the way to the back of his throat before he withdrew his muzzle, slurping lustily along its entire length. The taste produced sensations which aroused him inexplicably; it resembled the unique flavor of his own cum, which he'd never been particularly interested in consuming, but he'd tasted it once or twice after a masturbating session left his fingers rather sticky.

More startling was the fact that the anal stimulation incurred by the other dildo felt great. The German shepherd had never imagined that penetration would invoke anything other than discomfort, but now he realized that his assumptions had been terribly incorrect. Despite the pheromone-induced stupor currently beleaguering his brain, he perceived the sensations coming from his stretched tailhole quite well, and it was evident that the rubber toy was doing its job. Every time it plunged into his tight rear, accelerating slightly with each thrust, a delightful twinge racked his abdomen. Aaron had heard tales of prostate stimulation, but he'd never imagined how intensely pleasurable the experience could be.

Panting around a mouthful of cock, Aaron released a muffled "Mmrf!" as his sweet spot was once more assaulted by the thick shaft in his rectum. His attention returned to the screen, where it was evident that the two canines had accomplished quite a bit in the few moments Aaron had been preoccupied with his own situation. Having just given his partner's shaft a coating of saliva, the Dalmatian clambered onto the border collie's lap, pausing to apply a swift lick to his lover's cheek before focusing on the main event; he began lowering himself down upon the border collie's rigid cock, his own member protruding magnificently from the short, white fur surrounding his crotch. The Dalmatian hovered a mere hairsbreadth from the point of impact, inhaled in preparation, and impaled himself upon the thick rod beneath him.

Aaron observed the Dalmatian's muzzle contort into an "O" as his tailhole was stretched wide by the meaty intruder, his shaft reacting to the stimulation by spurting a jet of pre across the border collie's furry chest. The Dalmatian sank down further upon his partner's cock, his buttocks resting gently against the other canine's thighs as the cock hilted inside his rectum. Meanwhile, Aaron's arousal had accumulated to the point of frustration. He was receiving the full brunt of the rear cock's power, which had begun pistoning in and out of his stretched orifice at a significant velocity now. Not only could he feel a slight bulge beginning to swell at its base, but the swelling was also visibly apparent on the cock before him.

However, the impending appearance of the prosthetic knots didn't disturb the German shepherd in the least. In fact, in his entranced state, he welcomed the opportunity to have his various bodily openings stuffed full of as many thick, canine cocks as he could possibly fit inside them. No, what frustrated him was his inability to pleasure himself personally. His throbbing shaft hung magnificently beneath him, stiff as a flagpole and leaking everywhere like a broken faucet, but there was nothing he could do about it. Both of Aaron's hands remained shackled to the table, denying him any opportunity of bringing himself to orgasm. As intensely aroused as he was, a hint of disappointment surfaced as he recognized that there was no guarantee that he'd be able to get off during this experience. Perhaps that was even his captors' intention -- drive him mad with pheromones and deny him a happy ending at the last second.

Aaron wasn't able to dwell on this unfortunate circumstance for long. The repetitive motion of the cocks thrusting into him kept him preoccupied, constantly distracting him from the injustice of his situation. The pornographic material on the enormous TV screen also succeeded in capturing the German shepherd's attention quite regularly. Each time his thoughts began to stray toward getting himself off, he was suddenly distracted by the passionate canines in the video, the rubber cocks that plowed his virgin orifices with increasing intensity, or a combination of the two.

The Dalmatian's orgasm was swiftly approaching, as was apparent in the manner with which he carefully speared himself on the border collie's cock, riding it up and down as if he were an exotic dancer working a pole. He hesitated momentarily, his expression contorting into a rapturous expression of euphoria... then slammed himself down upon the bulbous knot beneath him. Aaron witnessed, captivated, as the knot forced its way through the Dalmatian's tailhole, which stretched wide to accommodate the enormous intruder, then enclosed around the border collie's thick flesh, completely enveloping it within the depths of the spotted dog's rectum. Simultaneously, the Dalmatian's shaft erupted in heated convulsions, spraying rope after rope of warm seed across his partner's upper body. The border collie closed his eyes and stretched his maw wide, catching several drops of cum on his tongue while riding out his own orgasm, pumping his seed deep into the Dalmatian's bowels.

Aaron whined, feeling his own shaft throbbing imploringly as if it ached to join in the fun. He couldn't withstand much more anal stimulation without his cock receiving its fair share. He'd begun thrusting in accordance with the rubber cocks' movements, jerking his body back and forth as much as the steel restraints would allow, in hopes that the repetitive motions might provoke an orgasm to occur. He closed his eyes, focusing solely on the slurping motions of his tongue as he caressed the thick shaft before him, burying it to the tip in his muzzle before withdrawing and dragging his tongue across the various crevices along its length. He was fairly sure that, had this cock belonged to a real canine, he would have induced an explosive orgasm by now.

A change in the sounds emitted by the TV screen convinced Aaron to open his eyes, and he observed that the content of the video had changed once more. Now it appeared that his captors were selecting shorter videos, possibly with the intent of displaying a larger array of material in a shorter time period. The video currently playing was already in progress, featuring a young anthropomorphic wolf, who appeared barely a day over eighteen years old. Aaron assumed they wouldn't display pornography of anyone below the consenting age, but considering the fact he was currently strapped to a table, being forcefully penetrated by mechanically-controlled rubber cocks... it didn't appear that his captors operated within the limits of the law.

The wolf on the screen was positioned on all fours on his bed, fully nude, ass elevated in the air; however, his tailhole wasn't visible to Aaron, as the space beneath his tail was currently occupied by the large, knotted dildo that he was sliding in and out of his ass. A throbbing erection was portrayed beneath him, spurting a veritable river of pre onto the bedsheets as each successive thrust of the toy prodded the young male's sensitive prostate. This was a feeling that the German shepherd could easily identify with, as his own prostate was receiving its fair share of attention from the rubber cock.

Aaron watched enviously as the wolf reached a paw beneath his torso and gripped his shaft, wrapping a paw around the fully-developed knot and jerking his entire length forward with violent, swift movements. The other paw remained in control of the dildo, which continued its rough assault of the wolf's tailhole. Aaron longed to envelop his own throbbing member in his grasp, to grab that knot and squeeze until he launched ribbons of cum across the table... The mere thought resulted in a spurt of pre shooting from the tip of his cock and joining the rapidly accumulating puddle of the clear liquid on the flat surface below.

The wolf was truly enraptured in his self-inflicted pleasure now, shoving the dildo in all the way to the beginning of the knot before extracting it and repeating the lustful action. One more thrust, a labored gasp... and the swollen bulb parted the layers of flesh, sinking into the wolf's receptive rear until only the very base of the toy was visible. The wolf reared back and howled as he clutched his knot with both paws, the pressure finally driving him over the edge; ribbons of cum sprayed forth from his tapered tip, soaking the bedsheets in his warm seed.

Aaron had begun steadily releasing moans with each additional thrust of the cock in his rectum, for it continued to hit that sweet spot inside of him, the little nub that triggered such an intense physical response that it felt as if his entire body was reverberating. It was obvious that the fake knot had swollen to its full girth now, for he felt a distinct pressure against the base of his tail each time that the shaft hilted inside him, marking the presence of a larger intruder that sought entry. He gasped around the shaft in his mouth, his pupils still attached to the TV screen as it once again shifted scenes.

The clips he was being subject to were definitely getting shorter; a scene abruptly flashed across the screen in which a nude, anthropomorphic husky leaned down before an enormous, feral horse, the horse's massive erection tucked firmly into the crevice between the husky's furry cheeks. As Aaron observed in awe, the horse pushed forward, spearing the smaller canine on its length without apparent regard for the husky's safety. No way he can take that thing, Aaron thought, but he continued watching in aroused fascination. Despite the husky's grunt of pain, he allowed the horse to sink nearly three-quarters of its immense girth into his rectum before pulling out slowly, his ruby-red erection bouncing stiffly beneath him.

It only took three more thrusts from the horse to send the husky into paroxysms of ecstasy, splashing a barrage of his milky white cum into the grass below as he rode the enormous girth buried in his rear. Likewise, the horse whinnied cheerfully, driving his shaft a little further into the husky's rectum before pumping gallons of warm seed into the anthro's bowels. A furious dribble of opaque, glistening semen poured forth from the husky's rear in spite of the thick cock filling it, leaking down his taint and balls and splattering the ground in a veritable ocean of cum.

Aaron nearly yelped at the sight, for he had become so furiously aroused that witnessing the husky being speared on the horse's shaft had almost been too exciting to withstand. His shaft throbbed mercilessly, hovering rigidly beneath him and spurting thick globs of pre onto the table on a regular basis. A new video flashed onto the screen, this time portraying two feral foxes engaged in a passionate display of mating. The top male's knot appeared moments away from slipping into his partner's rectum, a feeling which Aaron shared, as the cock in his rear had begun to apply pressure to his tailhole now, threatening to force its swollen knot through his abused opening with each thrust. The German shepherd fervently wished he had a free paw so he could finally finish himself off.

And just like that, as if in response to his deepest desires... the shackles on his front paws popped open with a resounding click! Aaron paused sucking on the shaft in front of him, staring dumbfounded at his paws for a brief moment, barely able to comprehend that they had been released from their restraints. He probably could have attempted an escape right then and there, but he didn't even consider it. Why should he? He had everything he needed --everything he wanted-- right here. He craved these rubber cocks, despite the fact that they were controlled mechanically by his anonymous captors. He desperately wanted to be fucked, bred, knotted, and filled with seed. Escape wasn't an option anymore.

One paw grasped the base of the makeshift shaft in front of him as he slurped along its length with renewed vigor, while the other paw flew eagerly to his aching shaft, gripping it fiercely and applying the pressure with his pawpads that he had sought for what had seemed like decades. It felt so incredible that he nearly came instantaneously. The foxes on the TV screen had already released a messy explosion of seed and been replaced with a new video clip, but Aaron didn't even pay attention to it anymore. He was focused solely on his own pleasure now, everything else be damned.

Aaron felt the cock behind him slowly withdraw, breaking the breathtaking pace that it had previously been operating at. He exhaled abruptly as he recognized what was about to happen, unclenching his muscles to prepared for the impending penetration. He wasn't left waiting long; the shaft slid through the German shepherd's stretched orifice effortlessly, burying itself up to the knot, then progressing more slowly as the knot began forcing its way through the thick layers of muscle and flesh. Aaron gasped in shock as a jolt of pain lanced through his abdomen, but it was quickly replaced by the wonderful sensation of his tailhole being stretched wider than it ever had before. The experience caused an explosion of pleasure within his brain, and he felt himself going limp, overwhelmed by the onslaught of sensations.

Aaron's tailhole put up a good fight, but ultimately, the knot won. As the bulbous girth applied more and more pressure, the beleaguered muscles finally gave way, stretching outwards and wrapping themselves around the enormous intruder, enveloping the entire knot. Simultaneously, the shaft before him pistoned itself roughly into his muzzle, forcing its entire length forward so that the knot rested halfway into Aaron's maw and its tip grazed the back of his throat. And then something occurred that Aaron had not been expecting: A warm liquid began squirting from the tips of both prosthetic penises.

Apparently, his captors had designed these cocks with accuracy in mind, for they both featured a channel through which a cum-like liquid could be pumped into the person using them. Though it wasn't truly cum, Aaron was beyond the point of caring. As the creamy liquid spurted into the back of his throat, the German shepherd greedily swallowed, milking the thick member of all the cum it had to give. A warm sensation began spreading throughout his bowels as the cock buried in his ass pumped him full of the sticky substance. A trickle of cum leaked from Aaron's stretched orifice, streaming down his taint and dripping to the table.

It was all the stimulation Aaron needed to finally push him over the edge. With a muffled grunt, he grasped his swollen knot with his palm and applied pressure, jerking his entire member back and forth forcefully. That familiar pressure accumulated in his loins, indicating the arrival of an incredible orgasm, the likes of which the German shepherd had never experienced. His entire body tensed, his muscles clenched, his eyes snapped shut, his balls drew up against his body, and he bit down on the cock in his muzzle without even the slightest hint of remorse.

One more powerful jerk, and the dam burst. Thick ropes of seed exploded forth from the tip of Aaron's throbbing cock in rapid succession, soaking the table beneath him in layer after layer of warm seed. It felt as if the knot lodged deep in his rectum ground directly against his prostrate each time he released a sticky load, sending him into a delirious state of bliss. His tailhole involuntarily clenched around the enormous intruder as his shaft convulsed, racking the lower half of his body with twinges of pleasure. It felt as if he rode out the powerful orgasm for ages, and the cum kept spurting forth, his balls being milked thoroughly by the intense stimulation he had received.

Aaron gasped around the shaft in his muzzle, which was still pumping rivulets of seed down his throat. By the time his orgasm abated, he was shaking from the sheer intensity, his fur matted with sweat and stained with artificial cum. Another squeeze of his bulging knot produced one last spurt of cum, which dribbled to the table and melded into the large puddle that had accumulated there. It was evident that the pheromone was still in effect, as it felt as if his body was humming, and his head was swimming in a drunken stupor.

The German shepherd allowed a moment to savor the afterglow, panting as the shaft in his muzzle withdrew and began its ascent toward the opening in the ceiling. The other cock remained buried in the confines of his rear; Aaron figured that his captors could probably reduce the swelling of the knot if they so wished, but he was perfectly satisfied with remaining tied to the device for now. So this is what it feels like to be bred, he pondered drowsily. He wouldn't have traded the experience for a billion dollars. Having sex with a female, which he had accomplished dozens of times in the past, was incomparable to this. He could never go back.

Aaron glanced at the TV just in time to see the pornographic display disappear, replaced with a live feed; plastered across the enormous screen was a camera shot of his own ass, skewered deeply on the thick, mechanically-controlled shaft. His own cock, now hanging limply beneath him, was barely visible between his legs. He marveled at the way his tailhole stretched around the toy's circular girth, doing its best to accommodate the bulky intruder despite the harsh physical demands forced upon it.

The voice crackled to life on the intercom. "You see, Aaron, this is the reward of your cooperation. This is your purpose." Despite the metal ring clamped around the base of his tail, the German shepherd couldn't help but attempt to wag excitedly. How appealing it sounded, phrased that way! "My purpose..." he repeated, entranced.

"This experiment was successful," the voice continued. "But we require further evaluation. We will provide you with a drug that induces a powerful stupor and, eventually, unconsciousness. Next time you go drinking, slip it into your friend Tyler's beverage, much like your predecessor, Chad, did to yours. Once he is under the drug's influence, make an excuse to leave and accompany him outside. He will be captured and brought here."

Aaron nodded in response, the sweet scent of the pheromones still wafting through his nostrils. What a fantastic idea! He'd be doing his friends a favor by involving them in this wonderful experience. "Wh-what about me?" he asked groggily, directing his question nowhere in particular, as he still couldn't discern where the intercom was located. "Do I get to return? How do I find this place?"

"Don't worry about finding us, Aaron," the voice replied in the same emotionless monotone. "When the time comes, we will find you."

The shackles around his limbs and torso snapped free.