Mike looked at the boy for a moment, bewildered by the matter-of-fact attitude he seemd to have about changing a centaur into a normal animal. Then it struck him that this was all just a silly game, anyway. It wasn't like he was really a centaur, either. Grinning, he thought over the choices - the one he wanted was obvious. "Go ahead and make me a stallion, please."
The boy nodded and put three of the brushes away. Then he moved next to Mike and started grooming him. The sensation was very pleasant, like a gentle massage combined with some tingling warmth. Mike twisted around and watched in growing amazement as his coat turned golden brown and glossy, and muscles began to build. As the boy continued, his legs lengthened and grew sthicker, and long white feathering spread down to cover massive hooves.
The kid paid special attention to his sexual equipment, and Mike found himself pounding erect. His penis, already that of a horse, dropped out as it swelled larger, becoming a mottled pink and black shaft that felt heavy and pleasurable under him. His testicles swelled from oranges to the size of small grapefruit, hanging down in a thick black sack.
When his entire equine half was done, Mike felt incredible - more massive and powerful, strong and full of energy. Then the boy started running the brush over his chest. At first, the only difference was his skin changing to golden-furred hide. But then his whole human rtorso began to sink into the horse body. His arms got smaller, thinner. If this was for real, he would be scared, but since it was just a game, he went along with the sensations.
His shoulders drooped, then melted into what was now a horse's neck with his human head. The boy grinned as he began to run the bristels over Mike's face. "Never had anyone so calm about turning into an animal before. Once I'm done, I'll put you in with a brood mare. Mating seems to take care of whatever is left of your mind, and then you'll think and act like ther perfect Clydesdale Stallion you are."
As the bristles tickled his nose, Mike felt his face push out, and his skull delfate. It was a very odd sensation, like his whole head was made of taffy, and the boy was stretching out. Vision shifted and blurred slightly, and his field of view expanded almost 360 degrees. Scents got stronger, and he could pick up sounds with his horse's ears that he hadn't noticed before as a centaur.
But then he started having trouble concentrating. His muzzle seeemd to be fully formed. In fact, he seemed to be a total animal now. But the boy kept working on his head. Dimly, Mike realized that his mind was getting thicker, his memories getting confused. When the boy finally put the brush away, it was hard to remember what he had looked like as a human or a centaur. Being a Clydesdale felt comfortable, normal.
As he stood there calmly in his stall, Mike's mind suddenly cleared. Ty was standing in fornt of him! The boy grinned, and then shook his head. "Man, you really hosed up this time. Don't you remember, I told you this was going to be real?"
Mike whinnied in sudden fear. Real? Wait a minute! This was supposed to be a game. He just wanted to play at being a horse, not spend the rest of his life as one!
Ty laughed. "Don't worry. I'll fix things for you."