Mistress Nica had made this guy eat shit for no reason other than she wanted to have fun and to try out scat fetish. But when she was done with him, she felt sorry for him and decided to make it up to him. The mistress did this with her sexy hands by jerking him off and helping him to get an orgasm. He loved what she did for him and even forgot what she had done earlier.
Mistress Nica noticed that this guy was incompetent and she did not want to deal with his incompetence. She felt that he had to change and that is why she had to use the cruelest method possible. The mistress used shit to do it and the guy was shocked by what the mistress did to him. He was turned into a human toilet and was made to eat shit for his incompetence.
Mistress Nica had a score to settle with her ex and she knew that there was no easy way to do so as she had tried many times before without much result. So she went out of her way to come up with a new way to do it. That new way involved shitting on the guy and she did so without any care in the world. It worked and the score was settled.
Mistress Nica used her pee and her shit to punish her slave and she made him regret what he had done to her. She was disappointed in him and that is why she made sure that he learned his lesson the hard way by making him a toilet slave. The poor guy had to drink pee and also eat shit. None of those things was negotiable. He had to do them all.
Mistress Nica and her friend wanted to humiliate this guy because he was a nuisance. They went ahead to caution him that they would not tolerate him continuing his nonsense and so they gave him a last warning. He did not adhere to it and had to be punished as a result. That is how he found himself eating their shit and drinking their pee. He never repeated his mistake after that.