Mistress Vivian wanted to make her slave know the kind of person she was. This is because she did not want anyone to mess with her least of all her slave. So she made him sit down and watch as she took a shit. And she wanted him to write an essay of all he saw. He had 3 hours to do it and she would grade it. If he passed, she would not punish him further.
Mistress Tulip wanted a roommate who was clean and she found out that her current roommate was not it. He was not clean and she feared that she would get sick with him in the house. She tried to talk to him to do things better but he did not change and so she did not have a choice but to shit on him to demonstrate how dirty he was and why he needed to change.
Mistress Vivian was pissed at how ill prepared this guy for the mission she had for him. She had told him that she was not going to let him get away with the mistakes he had made and he had to learn his lesson. So the mistress made him eat her shit and drink her urine as punishment besides turning him into a sissy and having him wear female clothes.
This mistress enjoys to dominate and it comes naturally to her. She does it in many different ways and today she wanted to try something she had never done before. So the mistress used her shit to do it and in not time, she had managed to degrade and dominate the guy to the point that she felt sorry for him, something that had not happened in a long time.