When this mistress got fed up with her boyfriend, she did not care whether they broke up or not as he was gambling and she did not want such a person in her life. She chose to pee on him and then shit on him as she was done talking to him. It did not help and she had to do something else to see if it would work better.
Mistress Zephy was not ok with this guy. She had told him what to do and how to do it but he went ahead and did his own things. He pissed her off so badly that she had to piss on him. She turned him into a human toilet. As such, he had to drink her pee. But before he did, she trampled him first to make him realize she was not messing around.
Mistress Zephy wanted to dominate this guy and she knew that if she did not come out strongly, she would not be able to dominate him. And that is why she chose to use her shit to do it. She turned him into a pee and shit slave and he had to drink and eat them respectively. He had never been through such degradation before and he learned his lesson.