Mistress Jennifer knew this guy was not foolish and would not buy her scat fetish blindly. So the mistress resorted to playing with her pussy so as to turn him on and also make him less observant and have him lower his guard. After he had done that, she surprised him as she got him to eat her shit. He was shocked but he was powerless on what to do.
Mistress Jennifer was pissed by her slave and she wanted to turn him into a human toilet. The mistress did this by telling him what she wanted him to do. He had to follow her instructions to the letter and because of how stern she looked at him, he was forced to do what she wanted. The mistress enjoyed how he ate her shit and licked her asshole as well.
Mistress Jennifer took a shit on her slave for no reason. She did not have any reason to humiliate him and she did it purely because she felt she wanted to do it. The guy was shocked at what she did to him but he did not have the courage to even ask her why she had done such a thing to him. He just took the humiliation and kept quiet.
Mistress Jennifer wanted to solve an issue between mistress Helena and Peter. She found out that Peter was the one who had committed the mistake and he had to be punished. The mistake he had committed was so grave that it needed a special punishment. And she did not want to let miss Helena deal with him alone so the two mistresses joined efforts and they made the poor guy eat shit.