You think back to your childhood days, looking through school textbooks and finding pictures of the mythical centaur. What fun it would be if you could turn this youth into such a creature. You decide its worth a try and focus on remembering just what it looked like. Turning back you see the boys upper head and body return, stretching out from the equine shoulders. The hair on his head cascades down his back into a long redish mane that matches his coat. His body frame swells with muscles, becoming the perfect centaur stud you wish him to be. His hind quarters now completely equine he pulls out of you, slightly startled that he is taller. But he hasn't seen all of himself yet.