"My god, this is amazing, this just gets better and better." Adam begins to stroke his blood engorged dick faster as pre cum coats the shaft in a slick sheen.
"Adam! Slow down! I don't even know if I can ever reverse the effects!"
"Reverse? No way little buddy, I don't want to reverse this...oh god... I think i'm going to..." Adam lurches backwards as his entire body tightens and flexes while is fat purple head unleashes its slime. Cum sprays a good 5' and even hits Mario. Even before the orgasm ends, which seems to last for minutes, Adams muscles begin to swell again.
His chest, already huge, rises outward like a pair of inflating balloons, lifting up so they rest just under his chin. His nipples, streching with the tissue, dialate to the size of silver dollars and hang low on the bulbous lower pecs. His shoulders follow suit, stretching wider as each muscle seperates and inflates, leaving deep grooves between them. They swell huge, at least as thick as one of his schoolmates chest.
It becomes increasingly more difficult for Adam to hold his arms down, as his arms plump to over 30", and his huge disproportionate lats swell outward pushing his arms away from his body.
His dick and balls continue to grow, his still rigid shaft now 16" in length, his nuts, the sizes of oranges hanging heavy and full from his body. His legs are now massive enough, Adam has to take a less conservative stance, as his thighs press heavily into each other. His calves too have blown up, fat with muscle, and almost as big as his arms.
"Oh my god...that was unbelievable...and I don't feel spent or anything..."
"My god Adam, you must weigh about 350 now, your huge!" Mario has his hand on his own dick, still sliding it up and down his 7" shaft, slick with his own cum.
"Looks like you enjoyed the show...oh god Mario, I don't think I can...hold it back, i'm so horny!"