Adam ripped off the remains of his torn clothing so that he could be more comfortable and get a better look at his new body. He grabbed his dick and stroked it a few times, then looked at Mario who was starting at Adam's exposed crotch. Adam was feeling massively horny, no doubt a side effect of the powder/his growth. "You gonna give me a hand with this python?" he asked. Mario didn't need any additional invitation as he dropped to his knees and started to help Adam get off. He wanted to see this beast in action! Adam turned his attention to his bulging biceps, flexing his arm open and closed.
As Adam indulged in his growing muscles, and Mario indulged in Adam's cock, neither noticed as hair started to sprout across Adam's body. First in the crevice between his expanding pecs, then it spread like a tiny stream down to his belly button before connecting with his pubes. Soon that tiny stream widened into a dark red river covering his whole chest and abs. The hair on his legs and forearms, which had always been sparse, thickened as more hair sprouted on his appendages. The top of Adam's feet and the back of his hands gained patches of man fur. In his arm pits, the hair thickened such that, what used to be barely visible, now stuck out prominently from his underarms. Even his face, which normally took several days before any significant facial hair to grow, quickly developed a short, coarse beard. And his normal haircut soon grew out into a scruffy, shaggy mop of hair to top it all off with.
While this was happening, Mario was doing his best to stimulate Adam's enlarged member using talents accumulated from years of practice. He was doing an excellent job too since the stimulation had been enough for Adam to become distracted from the growth of his body, closing his eyes and thus missing his hirsute transformation. Mario too was so focused on his task that he never ventured a gaze beyond the mammoth cock of Adam.