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 enlargened. 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.