Mistresses Beverly and Stellina had tried all kinds of punishment methods for their slave. They were bored of doing them over and over again. Just before they were about to let their slave scot-free, mistress Beverly suggested they try riding their slave like a pony. They did and humiliated him a great deal. He had to endure the weight of the two mistresses as they humiliated and tortured him by turning him into a human pony.
This mistress loves ponies. Unfortunately, she lives in an apartment so she cannot afford to have one. Instead, she decided to turn her slave into her pony and she loves riding him all the time in her house. She loves to sit on his back and pull at his shirt or ears to direct him. She enjoys kicking his stomach to urge him to speed up and there is never a dull moment for her but not for her human pony.