Mistress Samantha had girls who needed to learn how to shit on slaves and she agreed to show them how it was done. It turned out to be more fun than they had anticipated it to be. The mistress liked how fast they learned and how they paid attention to everything. They all had a great time but the guy who had to eat their shit did not have fun.
Mistress Samantha wanted to shit on this guy and she did it because she found him to be disrespectful. She felt that it was up to her to teach him a lesson and that is why she did it using her shit and with her pee. The mistress ignored his pleas for mercy and concentrated on doing what she wanted to him and she was sure at the end of it that he would change.
Mistress Samantha felt that this slave was not bold and that he needed to be. So she had to do things in a way that they had not been done in a while. That is why she resorted to dominating and humiliating him in a cruel way. The mistress turned him into a shit slave to send a message that he had to be bold or he would always remain a shit slave.
Mistress Samantha has no issue with anyone being proud of themselves. But she has a problem with negative pride, which is what she felt that this guy had. So she had to cut him down to size and she did it with her shit as well as with her pee. He had to eat her poo and it was not optional. He was degraded but he got the message from her.