Alex's penis hung down covered in fur. Pulling back on the outer skin he found out it could be pulled back all the way to the base, slowly releasing his slick pinkish member. It was still kinda human shaped, but the tip looked to be growing to a slight point.
Unable to hold his bladder anymore he released his holding tank into the toilet. Done, he let go of his dick and watched as the skin moved back down his cock hiding it from the world. He kinda had to laugh, it looked funny having a dog sheath that wasn't attached to his stomach yet.
Looking in the mirror again he was wondering what he would do about his beard and other body hair, it was too much not to notice on a 13 year old.