...more than you expected. MUCH more. YOUR penis has not disappeared; it has become inhumanly large, malformed and discolored... or, from another perspective, perfectly formed and colored. Perfect, that is, for a jackass.
You look up and catch your reflection in the mirror, and realize that if you didn't know it was you, you would not recognize yourself. Your beard is growing out, not just where it normally is, but all over your face and down your neck. And your ears are getting pointed and hairy as well.
And you can feel something growing behind you, and you think you might be more comfortable if you stood up. As you try to stand up, you feel -something- freed to hang behind you. You try to turn around to see what it is, but you can't. But you can feel it twitching behind you, and you know what it must be.
And you can't stand up; not all the way, at least. You can sit on the edge of the bed and lean forward for comfort, or you can stand leaning forward on your hands, on all fours. You look at the part-jenny across the room; she is looking at you as well. "What's happening to us?" you cry out. "Help me! Help me! Help me-haw! Eehaw! EEhaw!" But you know all too well what is happening to you. What you don't know is what comes next, or what you can do about it...