Dan took one more swig from the bottle and almost swooned from it's effect. He felt a weight between his legs and realized it was his penis banging against his thighs.
"Banging against my thighs...!!!"
He looked down as he still ran and saw his stride was getting longer. His legs were actually lengthening. The muscles in his thighs and calves thickened with each step. So much so that his pant legs started to tear. As they hardened with muscle, they lengthed. He could also see that he was growing hair on them.
The heat from his crotch seemed to be spreading to his other extremities as well.
His shirt got tight. His chest muscles pushed out in front like they were racing ahead of him. He looked down and saw his nipples leading the way though his shirt. His pecs became big and round and bounced as he continue to run.
Another wave of heat drove through him, radiating from his balls. He suddenly felt the need to rub his crotch and feel how big it was becoming; just like a man's crotch.
"Awwww, yeah!", he moaned as he rubbed himself. "Bring it on!"
He finished the bottle off and was slammed with a jolt of power so strong it stopped him in his tracks.
His back and shoulders exploded with the width of a power lifter. Thick, man muscles grew out from his, now, growing body. And he was not just becoming thicker, but taller.
He couldn't help but flex his biceps as they burst out of his shirt. His forearms blew up like balloons and were quickly covered by a light covering of dark hair. As he grew, his shirt lifted out of his waist and he could see hair growing up his stomach. As a matter of fact, he could tell that his chest was also becoming dusted with a man's pelt.
Dan rubbed his hand over his new, thick, muscled, hairy chest and touched his now prominent nipple. He threw his head back as he was filled with ecstacy. Throwing down the bottle, he grabbed his swelling dick. His mind was suddenly filled with the need to fuck. He needed to feel what this man meat could do.
With that, Donnie M. ran by him, barely giving a glance at the huge man in tattered clothing.
Dan smiled. He was about to get his revenge.