You feel your butt start to grow, as your tail got longer, and found that more of the beige fur around you was growing, while at the same time you masturbated your erection off. It was now so long, that you felt your own testicles move to where your butthole was puckering, in between your own legs.
Speaking of legs, your toes start to harden, as you try to stand, but to no avail, they become a pair of back hooves, while white fur was growing on them, covering them up. You hear the knock again. "Ben, are you in there?" the voice of your uncle came from behind the door, as you sat there, struggling to get up. However, Uncle Hank could hear your struggling as you try to get up on your now solid hoof feet, and fall failing to whenever you do, and your boner was still sticking up.