Mistress Tulip was pissed off at how untrustworthy this guy was and she wanted to sort him out. He had to change that trait about him and so she used her poo to punish him and to teach him a lesson that he had never been taught before. It was fun as she dominated him and she also loved that she got him to do what she wanted. It was a double benefit for her.
Goddess Nemesi is a punctual mistress and she loves everyone she is dealing with to also be. But when this guy did not, she was pissed and she had to teach him a lesson and that is why she used her shit to do it. She felt that he had to learn his lesson the hard way and that is why she did what she had to do to him.