Adam stood in front of the mirror in his boxer briefs, admiring himself. He flexed his right arm, and loved the way his biceps rose higher and higher, how it kept swelling as he flexed harder. He then bounced his pecs, and it was incredibly hot to see these huge mounds of muscle on his chest move up and down, up and down. He was almost sorry the growth had already stopped.
Suddenly, Adam turned around and looked in the direction of his chair, at the little pile of white powder that was still left. Without thinking, he went over to the little pile, bent down, and inhaled it. Instantly, the strange tingling sensation returned, only much stronger this time.
Adam groaned as his muscles resumed their growth. He could feel his weight increasing with every passing second as pound after pound of muscle was added to his already incredibly muscular physique. He felt his calves pulsing with muscles, and he was aware that his muscle butt was becoming more and more pronounced, threatening to tear through his increasingly tight boxer briefs any time soon. He looked into the mirror and watched himself grow, watched how his pecs swelled larger, protruding further and further from his chest and pressing his nipples downward against his abs. He struck a double biceps pose, and while his lats spread like wings beyond his wildest dreams of what a v-shape might look, his triceps bulged insanely, and his biceps rose higher and higher, fighting for space with his thickening forearms and growing shoulders. The increasing size of his quads forced him to adjust his stance, and his cock rubbed against his inflating pecs, lengthening and thickening, protruding obscenely from his boxer briefs, and throbbing with excitement. Adam must have weighed at least 450 pounds by now, and there was no sign that his growth would stop anytime soon.