The boy hesitated a moment, but then stripped quickly and moved in front of Mike. "The stuff won't affect you, cause it came from you. But if I tried to apply it myself, my hands would be hooves.." He held up the straw.
Mike scooped as much of the thick semen from the straw as he could, getting a respectable amount. "So, what do you want?"
The boy grinned. "You choose. The more control you have, the more you can do."
The first step was obvious. He learned over a smeared some of the semen on the boy's genitals. Then he coated each ear, the nose, and rubbed some into the base of the boy's spine. With each application, he imagined what he wanted. A more equine penis and balls, horse's ears and a broader nose with flared nostrils, and a flowing tail. But even after that he still had most of the thick spunk left. Grinning, Mike spread it over the boy's chest and arms, then his back and legs. When he was done, the boy's entire body glistened with an even coating, and he wiped his hands off in the boy's hair.
The boy was panting, obviously aroused and flushed with excitement. Nothing seemed different, and Mike suspected Liam had been pulling the boy's leg. Still, he did feel a strong bond.
"Father won't come back out here tonight. And he is going to town tomorrow with another farmer, so he'll be gone all day. That should be long enough."
It was getting dark out, and Mike lay down carefully in the straw. The boy came to sit between his forelegs, and Mike hugged him and massaged his head and shoulders gently until they both drifted off to sleep.