Mistress Maryan wanted to make sure that her client did not try any nonsense. He had tried to go back on his word and to mess her up and she was not going to allow that as they had allocated a lot of time and resources on the project for it to be abandoned midway. That is why she chose to make him eat her shit and to drink her pee.
Mistress Samantha wanted to find a new tool to humiliate this loser and she had to ensure that she used it to get what she wanted. The mistress had to go out of her way to get the guy to eat her shit as well as drink her pee. The cruel punishment worked out the way she wanted and she managed to degrade the guy in the way she wanted.
It does not matter what a loser does. As long as this mistress feels that she needs to punish them, she does it in a cruel manner. The mistress chose to shit on this guy when she felt that he was boring. The mistress had a great time doing it but the loser was humiliated and he never wanted to feel or experience what happened to him again. It was terrible for him.
When this mistress chose to dominate this loser, she had to use a potent weapon. She wanted to take the guy by surprise and that is why she chose to dominate as well as torture him with her shit. He had to eat it all after he had watched her take a shit. It was humiliating as well as degrading for him but he had no say in the matter.