A human, bit of a pudge, waking up strapped to a rack in a smallish and otherwise empty room, maybe a story and a half tall, but the cieling is dark and shadowy, there's one door, but some cameras facing the table from different directions

Try to struggle, but the restraints allow only a limited amount of motion. Looking around, you see a door, sized for large cargo, with a soft red light above it. There'd be a click, then a soft whrring hum as the cameras seem to activate, then orient themselves on the human, although one camera is pointed at the door, now a pulsing red before suddeny switching to green, the mechanism of the doors grinding and the two halves of the door sliding out and open. 

The light brightens, then  reveals an overly muscled and oversexed red husky carrying a very large drum cannister, effortlessly holding what would have to be a heavy weight when it's just empty, before placing it gently next to the rack - but even then, a loud thud ressonates in the mostly quiet room, revealing the mass of the mysterious cannister. 

After the clanging noise does down, there is only the the faint soft hum of some electronics and the lights, and the breathy panting of the husky, his simple-minded gaze on the human, staring in intense and desperate focused lust.

"Master said I was a Good Boy, and that if I do a," he pauses, his crystal blue eyes staring off to the side a moment as he sounds out the difficult words, "si and tiffic ex spear mint, I can cum." The humans gaze drifts downwards - the husky's cock was a red and veiny 12 inches long and nearly six around, the bulbous knot already fully inflated, with a faintly glowing ring underneath the knot, then his sack, slowly swinging as two basketball sized nuts fought for space with each other and the husky's massive thighs, nesseccating the canine to take a very wide stance.

The husky tilts his head to the side a moment, as if listening to something the human can't hear, before his tail starts to wag rapidly, "Master says it's time to start!" he shouds excitedly, before literally ripping the top of the cannister off with a loud pop and shreak of metal, a bit of milky viscous goo sloshing out and splattering on the ground. The big canine scoops up a big doublepawful of the slimey goop from the canister, then quickly splatters it all over the human's chest, eliciting a gasp from the naked man.

The liquid felt slightly cool at first, but then rapidly warmed up and then seemingly evaporated. A slight tingling sensation grew on the skin where the goop had spread. The human barely had time to process before the husky splattered more goop, this time on his stomach, the warmth and tingling spreading down there as well. The husky repeated the process, now using his paws to spread goop up and down the human's arms and legs, then reaching behind to rub it into the bare skin of the back and sides. He paused for a moment, letting out a soft moan as he rubbed it into the man's buttocks, but eventually moved onward to rub it deeply into the human's feet and toes, leaving only the human's head and crotch untouched by the fluid.

The tingling sensation grew to feeling almost electric, but in a pleasant way, the warmth being relaxing but also somehow tensing. The husky once again took a double handful of the goop - now reaching further and further into the cannister, and instead of splattering it, started gently applying it to the humans shoulders and neck, sliding upwards around the back of the skull. The tingling sensation quickly spread there as well, then following the husky's paws as he trailed over the humans jaw, forehead. 

The canine wiped it over the human's lips, then growled as the man made to bite down on the husky's big blunt finger as it intruded into his mouth, "You be good boy for me or else". The growl sent a shock through the pleasured warmth the human was feeling and he let the husky rub the fluid inside his mouth, having a surprisingly tart flavor before also evaporating and leaving the warm and tingly sensation.

Taking another handful, the husky just placed a big splatter on the human's nose, then forced the human to breath it in. Coughing and sputtering, the human gasped as the tingling sensation invaded his sinuses, the overpowering scent temporarily stunning his mind, then recovered as the scent slowly faded, the liquid again disappeared, leaving only the warmth and tingling. The human's eyes stung sharply as the husky applied it to his eyes, but the human was still dazed from the smell and inhaling the liquid to notice.

Head still spinning, the human didn't noticed the husky taking the largest amount of goop yet, but he certainly felt the impact of the cool gel on his crotch, the husky's broad paws rubbing it in, one meaty paw on the man's balls, the other on the man's cock, both dwarfing the human's average sized equipment. The liquid evaporated again, leaving the warm tingling sensation that was building up like a static charge inside the bound human's body.

While the human was dealing with the building sensations inside him, the husky waited patiently. Three hoses dropped from the shadows in the cieling, and the soft whrring sound of a pump activated from above. The husky took the thicker of the three tubes and dipped the open end into the cannister, then took both of the other smaller tubes in paw. With ease, the husky flipped - rotated, really - the rack, temporarily leaving the dazzed human upsidedown. A small spurt of fluid hits the human's rump, the only warning before the rubbery nozzle of the hose was slid in, the shock of entry eliciting a cry of violation, followed swiftly by a confused moan of pleasure as the tip pressed against his prostate, a small pressure growing as the nozzle both spewed liquid into the human's rump, and inflated slightly to act as a plug.

The husky rotated the rack again, bringing the human right side up. The humans chest heaved, breathing and panting heavily, his eyelids fluttering as the growing sensations in his body began to overwhelm his concious mind. Taking advantage of this, the red husky rudely shoved the third nozzle into the man's mouth. The intrusion gave the man a temporary moment of lucidity, but the nozzle was already pointing down his throat, the back end inflatining to keep him from being able to spit it out. The man's gag reflex started to kick in, only to seemingly disolve as the hose in his mouth joined the one in his rump, spurting the goo down his throat, the warm tingling sensation overriding the automatic instinct.

With this done, the Husky pulled back, and waited. The human's thoughts were muddled as he observed the husky, distracted by the phallic objects in his mouth and rump, the warmth from his skin meeting the growing warmth from inside his body, the static, electrical feeling growing and building. The scent of the liquid was still all over him, and seemed to grow stronger with every passing breath. He noticed that he was starting to moan with pleasure with every exhale, and confused, looked over at the husky, then looked at what the red canine was intently staring at: his own cock.

Without realizing it, the human's cock had grown to full mast, engorged and pulling with blood, twitching a bit here and there. The human moaned again, this time with his hips bucking as the growing warmth and electrical sensation in his cock turned to pleasure, building up. Stars invaded the human's sight as the pleasure built higher and higher, reaching points he never thought possible, and still not coming.

Panting quickly and heavily, writhing in his restraints, the powerful pleasure from his cock overrode all higher thought. Pressure and tightness filled the human's body, deep grunts and loud moans of pleasure reverbing in the room. The husky never had his gaze leave the pleasure-wracked human, but his big meaty paws began to rub up and down his turgid member, exciting himself for what was to come.

Then the dam broke, and the human nearly screamed in pleasure as his cock spasmed once, then a second time, his balls pulling up, his rump clenching the plug in his ass tightly as he came, a large jet of milky white seed spurting from his tip, then a second, then a third, then even more as a seemingly endless mass of semen ejaculated from the human's cock, dribbling all over his face, chest, and the rest of his body, the fluid spraying all around the rack as well, a particularly strong shot hitting the muscular husky in the arm, who then strained with his limited flexibility to lick it off.

With each shot of jizz, the human's body subtly altered. The pudge on his belly and frame slowly dwindled away. The flab on his arms shrank down, the biceps and triceps showing their definition as the human's orgasm-fueled writhing pulled against the restrains. His slight moobs faded away as his chest flattened, the slight love handles receeded into his sides. The most noticable change was in his belly, which slowly shrank down like a deflating balloon, soon leaving his stomach smooth and flat. The changes in all were minor, but left the former medium-shirt wearing human now more fitted for a small.

But the man kept cumming, and the process continued as his body began to bulk up with muscle, his now flat stomach firming and hardening to be a visible six pack, his once flabby and now flat chest rising as his pectorals bulked up, giving him a noticable rise above his ribcage, which expanded slightly outward, barreling his chest and making the man's moans deeper in pitch. The man's straining arms and legs, already bulging from pulling at the restraints, swelled further, twitching as they grew larger. The muscle building in the human's arms and chest met at his shoulders, the growing fibers forcing his shoulders slightly wider, then rolled down his back as it bubbled with new definition.

As the human continued to come, semen dribbling slower from his cock, the changes continued as his hands and feet twitched and spasmed, then swelled slightly larger to match his new frame, fingers and toes becoming thicker. The rack itself creaked, as the man's legs, arms, and torso grew slightly longer, stretching a bit here and here, adding another six inches of height to the man's body.

As the last jet of seed dribbled from the human's cock, his body became slightly thicker overall, more heavyset, and more of the type to need large shirts to accomodate the width of his shoulders and bulk of his muscluature. Eventually the orgasm rolling through his body died down, leaving a more subdued version of the warmth and electrical feeling in the human's body, limply hanging in the restraints from the force of the orgasm before slowly coming to, a small, low gasp escaping as he looked down on his changed body.

The husky walked forward and removed the nozzle from the man's mouth, who hoarsely asked, exhaustion tinging his voice, "What... what did you do to me..." The husky let out a soft bark of approval as his paws and nose explored the human's changed form, then answered, "Making you better and a good boy for master."

There'd be a short "'taking stock' scene where Kenzo (the human) marvels his new size, then a speaker will drop down, Master will have a short conversation with Kenzo - Kenzo demands to know what happened, Master will tauntingly explain "Because in a few minutes, you wouldn't understand anyhow." Jason would pull the nozzle out of Kenzo's rump, then dump the remaining goop on top of him, the electric feeling quickly returning to what it was right before the orgasm, then building up even higher.

Kenzo's form would being to swell and bulk in size, the rack creaking until the restrains open and he falls to the floor, onto his hands and knees - but the electrical sensation and the feeling of growth keep him from getting up, panting in place as his body continues to increase in size.

Staring at his hands, he notices his skin look off-color as they swell and stretch, his fingernails shifting, growing, sharpening and darkening into claws. The skin of his thick baseball glove sized hands itches and tingles as red and white fur grows out of them, but a pressure in his lower back suddenly appears, leaving him gasping.

His hips creak and groan, feeling like a vice tightening on them even as they swelled larger on his frame, the muscles of his rump inflating and firming. The pressure continues as something starts to poke through the itching skin at the base of his spine, the pain of something forcing it's way out mixing with an oddly erotic feeling jutting down from his skull, down his spine to the new protrusion, his hair growing out and along that path in a surprisingly pleasant feeling that matched, then exceeded the pain of the growth. 

The itching feeling spread over Kenzo's body as red and white fur spread along his back, sides, and limbs, but an odd toughening sensation along his underbelly grew as his skin dried out and formed into bright red scales, the lack of fur accentuating his meaty pectorals and thick cobblestone abs. 

The speaker would sound, but Kenzo would be too lost in the mixed sensations his body was undergoing to catch that the Master told Jason to "stimulate the test subject. If you're a Good Boy about it, I'll turn off the inhibitor."

Jason would gladly take it up, and all of the sudden Kenzo would feel something very large and hot poking at his changing rump, letting out a squawk of surprise that quickly turns into a moan of pleasure as the husky sinks half his cock six inches deep into the changing human, the pain of the growth suddenly gone as his tail pokes out, at first three inches, then growing to four, then five, then ten as the muscular red husky continues to sink in, a full foot of maned tail sticking out of Kenzo's rump as Jason's full 12 inches of turgid husky cock was buried inside of him, the transforming man's innards screaming with pleasure from the stimulation.

Jason pulls out a bit, then slams back in, his oversized nuts swinging forward and hitting Kenzo's own, and another burst of pleasure washes over the man as his tail surges in size again, another three inches, barely recovering before Jason repeated the process, picking up steam as the pleasure changed from jolts to waves to a constant pressure.

The pressure surged from Kenzo's hips and rump down his legs to his feet, the hairs on his legs falling out as the skin itched, then fur exploding across his massive quads and rapidly spreading across his legs, his feet thickening and growing wide, to better carry his weight. His legs ache for a moment as they stretch longer, the diamond shape of his calves swelling as his thighs thicken. His hips pop and widen in a great sudden moment as Jason hilts the changing man again, giving room for his thighs to coexist but they soon start rubbing against each other again. 

Soon everything from the waist-down is covered in fur and transformed, feeling off and alien to Kenzo, but the oddness is balanced out by the electrical feeling of raw strength, feeding the pleasure from the chemicals in his system and the pounding the still more massive husky was giving the changed man.

The feeling of change suddenly spread outward from Kenzo's spine, across his back, the muscles pulsing as they grew and defined further, hunching the man forward a little at first until the change wrapped around to the front and evened out the growth. The moans coming from Kenzo deepened alongside his chest as his lungs expanded, his breaths becoming deeper but still just as quickly paced.

Kenzo's chest heaved from the panting, each breath causing his chest to rise, but only fall a little bit back as his torso began to swell, his chest barrelling out further, pectorals thickening and his stomach developing the deep cobblestones of an eightpack. His shoulders popped as they widened, his neck thickening to match.

Kenzo's arms would lengthen and swell to match the new frame, hands are already changed, scalp would tingle as the hair on the head grows out wilder, a strange and different pressure - almost a headache - building up as the skull shifts and molds, the ears pulling back and widening, and two horns swelling up, then bursting out, causing Kenzo to see stars, the sensation causing his arms to become like jelly and stop supporting the nearly changed man, his torso hitting the ground with a large thud as Jason continues to pound, the knot pressing harder and harder against Kenzo's rump each time.

Kenzo's face would feel like a bad sinus headache as pressure mounts, his face being pushed out by changing and expanding bone and muscle as his muzzle forms. A feeling like blinding light hits Kenzo, his eyes shifting in shape as the blue overtakes the white and the pupils become slits, the light fading as the sensation of change fades from Kenzo's head, but leaves a weird metaphysical pressure in his mind, his new ears twisting to hear a faint static coming from the speakers.

Master's voice comes on, "You're nearly complete, doesn't this new body feel good", bit of introspection again, attempts to deny but its broken my a loud cry of pleasure as Jason's knot finally gets in, and the large husky switches to short rapid strokes, jackhammering away.

The voice continues, "Oh, I bet you're starting to feel a bit excited, yes? Mmm, I think I'll just let your cock speak for you," as the electric feeling would build up in Kenzo's still human cock, blood rushing in as it rapidly grows to full length, then feels like it's being overfilled as it swells, larger and larger, longer and longer. As it swells larger, it darkens in color, twitching as it grows to a full thirteen inches of jet black ebony cock.

A flushed feeling would come over the transformed dragon's face, his large cock hard and throbbing with need, panting heavily as the tingling entered his sack, and a weighty feeling grew as his balls expanded. They'll go from grapes to kiwis to apples, pan back to feelings from Kenzo, then to grapefruits, then cantaloupes, then watermelons, the testosterone pumping out from his balls swelling his frame a bit more, the black fuzz of his hair extending down the squaring jawline of his muzzle to form a beard, two extra sensitive nubs swelling on his nose.

The feelings from Kenzo's cock would intensify, slowly drowning out nearly everything. The Master's voice would continue, as Kenzo groggily listened "Now this is the fun part - as soon as you orgasm, your past life will be gone. Wiped out from your head! Big beefy dragons don't need human thoughts after all." A small shot of panic hit Kenzo's brain, temporarily holding back the encroaching feeling of the world consisting solely of his cock and balls, as the Master continued, "If you manage to not cum, then you'd keep yourself..."

Kenzo would desperately try to hold on, but the jackhammering of his rump and the pressure on his mind would be too much, and with a mighty final thrust, Jason would let out a loud howl, his cock spasming as it unloaded into Kenzo's middle. The hot fluids building up and putting more pressure on Kenzo's prostate would be too much, and with a loud grunt, he came.

The orgasm washes over him like a tsunami. The nubs on his muzzle swell, then shoot out, becoming long whiskers, as the tip of his tail grows more black fuzz, a few tufts growing further in all over his body. With each mighty jet of musky draconic seed, his memories started to fade one by one, forgetting his job, school, friends, then his family, then eventually his own name escaped him as his balls shrank down in size, while his middle swelled with the copious husky cum flowing into his gut.

Shaking, he felt the pleasure wash over him. The pleasure felt good, a voice told him. Certainly felt good to be what he was, his body felt good, and being where he was felt good. Master would be by soon, the voice told him, and he wanted to be good for Master.