Mike watched the stallion with a wary eye. He wasn't sure how to react, he hadn't exactly been a horse for a long time. The stallion kept circling around him, sniffing. It occured to Mike that the stallion might be setting up a challenge, and maybe he should start responding.
Even as those thoughts went though his head, he felt the shock of weight on his back! The stallion was on him, and in him, faster than he could possibly have imagined. Mike tried to break free, at least mentally, but found that his body was rooted to that spot, changing even as the stallion thrust in over and over.
When the stallion was done, he slid off the new filly. Mike felt control return to his muscles, but found quickly that he was now a she. the human part of her felt repulsed by what happened, but a growing feeling of contentment was forming deep in her mind. Later, when the huge stallion mounted her again, she felt even more complete.
Mike knew that this was what Ty had warned about, her soul was turning equine. But the more that happened, the harder it was getting to pull away. At the rate it was going, Mike feared she would be nothing but a huge broodmare in just a few weeks!