Dylan set the now empty vial down on the dresser, not sure what to do next. He could still hear Evan in the shower. Dylan figured that if Evan was half has horny as he was, then Evan would be jacking off in the shower, so he had some time. It didn't make sense to go get new clothes now, not with the impending growth.
Dylan undressed himself, again and stood naked in Evan's room, his massive cock swinging between his muscular thighs. Despite the growing taking some time to start last time, it didn't take more than a couple of minutes for Dylan to feel the changes. His body tingled with anticipation and with the beginning effects of the potion. Dylan tried to figure out how much he was going to grow. Evan had grown significantly, but Evan wasn't blessed with the same genetics as Dylan. Without the potion, Dylan's beard would have been better than Evan's any day of the week and he was already on track to be taller than Evan too. Now with the potion on top of his genes, Dylan wasn't sure what to expect.
Suddenly he lost control of his body, collapsing to the floor. His body writhed in complete ecstasy as his body began to grow more. Dylan grunted, noticing his voice had dropped from a baritone to a bass. It was definitely beginning. His legs and torso began to lengthen, forcing Dylan into a state of perpetual orgasm. He stretched more and more and more, until it finally stopped. Dylan laid on his back and bent his knees to start to stand up when suddenly his feet shot outwards, knocking him back down. His now size 16 feet began to become harrier. Hair filled in the rest of his body, working its way up. It filled in the rest of his legs, working up to his pubes, which became a truly unmanageable forest of hair. The hair on his abs and chest filled out even more, until it worked its way up to Dylan's already perfect beard. It grew longer, fuller, manlier, until it was so perfect, Viking men would have been jealous of his teenage beard.
The hair finished, but before Dylan could react, more muscle exploded all over his body. His calves shot out going from toned to massive in seconds. His thighs did the same before the muscle worked its way up to his abs and pecs, which became so massive and ripped that despite all the hair, Dylan's now 8-pack was visible and perfect. Dylan's shoulders widened as the muscle traveled down his arms, filling out his biceps and triceps until they were the size of watermelons.
Dylan, still on the floor, looked down at his hard cock and watched in awe as it grew thicker and thicker and longer and longer. His cock was definitely bigger than Evan's now, in fact it was definitely bigger than any man's now. Watching his own cock grow so big made Dylan shoot a load so powerful it hit the ceiling.
Dylan worked his way to his feet, laughing in his new much deeper voice. He turned to the mirror to get a look at himself. He had to be 6'8". Dylan couldn't wait to literally look down at Evan. He examined himself further and came to the conclusion that he had to be the absolute specimen of alpha male perfection. Dylan felt confident and powerful. Not just physically powerful, although he was likely the strongest man alive now, but emotionally powerful. Dylan didn't realize that thanks to his genes and the potion, he had one more thing that Evan didn't. Dylan's body now produced an alpha pheromone that would make all lesser men incapable of resisting him, as well as the added effect that those who spent time around him would continue to grow too.
Dylan wrapped one hand around his massive cock and the other reached up to massage his pecs, oblivious to the fact that the water had shut off. Lost in the effects of the potion, Dylan didn't notice Evan open the bathroom door, and come into the room naked.
"What the fuck?" Evan said, looking up at Dylan.
Dylan turned around just has his new alpha pheromones hit Evan, but before either of them could say anything, Evan. . .