Mike couldn't belie that he had just taken a dump like that but the evidence was right in front of him. He knew he should feel ashamed at this but instead it just felt natural. In fact, now that he thought about it, it was kinda of silly to hold your bowls like that till you could find a secluded spot. It was much more practical this way. The Stable boy grinned and said, "I hope you aren't tired because we are just starting."
He bends down and picks up another brush from the bag and starts to brush Mikes Centaur cock. Mike hummed with pleasure as the bristles went over his dick, seeming to penetrate deep into his pleasure sensors. When it was over, Mike looked down at the stable boy not feeling any different. He just smiled and said, "You'll probably enjoy that one, it will make you unbelievably horny whenever you see a mare. I haven't yet to see one of your kind resist the urges after this brush."
Mike just looked at him confused and said, "But I'm not horny at all, least not for a Mare."
"You really are a dumb one aren't you? Didn't I just say it would only make you horny if there was a mare near you? But if you need a demonstration, we already have one prepared in the town square now come on."
And with that, the Stable boy began to lead Mike out of the barn. For a moment Mike thought he was setting him free but the saddle on his back kept him from going more then a few feet from him. It had been bad enough to be led around like that in the barn, now he was being lead through the streets. the towns folk openly pointed and laughed at him, especially when he had to take another dump right in the middle of the road. This continued until they reached the center of town were Mike saw that They had tethered a young Mare who from the smell that Mike had never noticed before, was ready to be mounted.