This guy was so unproductive that these mistresses felt that the best thing to do to him was to trample him as well as humiliate him to teach him a lesson in productivity. They did not want to pay someone who did not give them value for money. So they trampled him with their high heels as well as got him to drink their pee and lick their smelly assholes.
Mistress Zhao and mistress Yan are very particular in the way they want things done at their house. This slave did not know that but he found out about it the hard way. He was punished and degraded by the mistresses as he was forced to lick their asses and he trampled and farted on. They basically did whatever they wanted to him to make him learn to follow their orders.