These mistresses had caught this guy doing things he was not supposed to do and they were not happy about it. They had to make sure that things worked out the way they wanted. The mistresses slapped the shit out of him and when he thought that that was all, he was shocked when they turned him into a human horse and he was ride and made to endure a lot of pain.
These mistresses wanted to distract and dominate this guy so they did it and they did it with their facesitting fetish. The mistresses were of the opinion that they needed to crush as well as humiliate the guy and they did it with their hot asses after they had turned him into a human pony. He was shocked and pained but there was little he could do about it. He learned his lesson.