The shift in his pants was unmistakable, and, startled by this, Brian stepped back and undid his jeans letting them fall. His cock had changed, in it's place a furry sheath, and sticking out was an enormous, bright pink, throbbing erection. At the base was an enormous bulge, a knot the size of a grapefruit, and that was when the male reused that he had a wolf's dick. Jacob had been watching the entire time, and the smell of a wolf's horny pheromones reached his nose. Surprised by what he was seeing, it didn't stop him from stepping forward, licking his lips. He fell to his knees, wrapping one hand around the foot long wolf cock, stroking it, feeling all around. The changes around Brian's crotch slowly spread, his balls dropping into a furry sack, growing slightly larger. The fur spread out, down his legs, up his stomach.