Lady Betty and Bertie are cruel mistresses and they like to humiliate and punish people sometimes for nothing. They met this guy outside their apartment and accused him of walking in a funny manner. They took him inside and crushed him and trampled him painfully. They just wanted an excuse to humiliate and torture him and they used the lamest excuse they could come up with. They even jumped on him.
This mistress and her friend have sexy legs and they wanted to make them even sexier by toning them. They hence decided to do some exercises but not the kind that you think. Instead of going to the gym, they decided to trample their slave as a way to exercise. It was fun for them, painful and humiliating for the slave and it was a great in their opinion because it killed many birds with one stone.