This slave was cunning and the mistress found it a little funny but it had gotten to a point that he was taking advantage of it to avoid doing certain things or to come up excuses for why he had messed up or why he did not do something. So she out an end to that by shitting on him and forcing him to stop using that to escape accountability.
This mistress likes people who keep their word. But this loser did not and he ended up pissing the mistress. He did not think there would be any consequences for his actions but there were plenty and he did not like any of it. The mistress turned him into a human toilet and she forced him to eat her shit. He also drank her pee before she was done with him.