At first, Guy thought his mind must be playing tricks on him. He had already grown bigger than any bodybuilder in history... 600 pounds of sheer, massive muscle. Mr. Yuan had said that he would get the body he wanted - really wanted, not consciously, but deep down in his guts. But the growth had stopped at 600 pounds. Why were his muscles swelling bigger again now?
Then, suddenly, he knew the answer. After getting back home, barely able to squeeze his hulking body through the door of his apartment, he had daydreamed about how he would have looked if he had grown even bigger... and this had, apparently, triggered a new wave of growth!
"Fuck, I can't grow another 300 pounds of muscle, that's insane!" But it was pointless to fight it. Guy could feel the magic power flooding his body, forcing his muscles to swell bigger and bigger: lats widening, traps rising higher, neck thickening and pecs pushing outward. Once more he had to adjust his stance as his already humongous quads pumped themselves up, throbbing and growing, already beginning to put some strain on the new clothes Mr. Yuan had given him after the last round of growth had subsided.
Guy could feel himself getting hard, confirming that - whatever his conscious mind wanted him to feel - a deeper, more powerful part of his psyche relished the feeling of sheer masculinity caused by the growth. The vast expanse of his back was becoming even wider; his already massive neck thickening further. He could feel his lats inflate with size and power, pushing against his growing, bulging arms, the muscles competing for space, throbbing, pumping, broadening further. Guy could feel his weight increasing as pound after pound of raw muscular mass was forced into his body, the muscles swelling underneath his skin: biceps rising higher, growing fuller; his calves and muscle butt pushing outward while his mountainous pecs kept bulging, heaving, far beyond what he could have imagined.
Once again his clothes were becoming too tight, too small for his relentlessly growing body. His shorts looked as if they were painted onto his thighs, and every bulge on his upper body was outlined clearly through his shirt. Guy couldn't help but moan as his biceps tore through the fabric of his sleeves, and his cock grew even harder as the seams of his shirts were ripped apart by his massive, growing, thickening quads.
Bigger and bigger his muscles grew. Guy was aware of all the changes, could feel his abs throbbing and swelling, increasing in size and pushing outward just like his pecs, rising higher like his traps and biceps, thickening like his forearms and neck and calves, bulging, pumping, stronger and stronger... Guy roared in ecstasy as his back and shoulders finally tore his shirt to shreds, revealing the body of a true Hulk underneath, massive, symmetrical, with perfect proportions and still growing bigger, thicker, harder.
The growth stopped just as Guy came, shooting a load commensurate with his size, a seemingly endless orgasm that didn't leave him drained, however, as if his stamina had increased as well. He gather his thoughts and turned around to take a look at himself in the mirror.
"Holy shit!" was all he could say as he examined his 900-pound body - or rather, as much of it as was possible; he was much broader now than the mirror on the wall, and he had to move his hulking frame here and there to get a proper look at all of his muscles. Guy couldn't help but grin as he flexed and posed, admiring his newly augmented self.