Mistress Samantha and her friends had beef with this guy and it was due to the fact that the guy had humiliated them when they had hosted a function. He had to be punished for it and the mistresses did so using their shit. He had to be punished for the nonsense he did and so they made sure that he ate shit and that he drank pee before he was warned never to do that again.
Mistress Samantha needed to make sure that this slave stopped being evasive and that is why she did what she did to him. He had to eat her shit and to drink her pee. She did not wait for him to start eating it on his own. She smeared the shit on his face and she had fun torturing him for it. He got the lesson and he changed by stopping being evasive.
Mistress Samantha felt that her business partner did not want to put in the work that was needed to make their business a success. He left the heavy lifting to her and that was not ok with her. He had to learn his lesson and she fed him poo in an effort to teach him the lesson she wanted him to learn. He ate the poo and he changed for the better.
Mistress Samantha wanted her friend to learn how to shit on a slave especially one who was troublesome. That is why she concentrated on doing it while her friend watched and learned. When she was done, she let her friend have a go at the slave and she did. It was cruel for the slave was it was double torture for him. He could not believe that he had to eat shit from two mistresses.
Mistress Samantha had asked her student to do certain things for her but he did not do them as well as she had wanted them to be done. She had to punish him because she felt that he was messing up on purpose and she did not like that as he had a bright future. So she turned him into a toilet slave and degraded him to make him learn a lesson.
Mistress Samantha wanted to work with someone who was flexible to the ever changing demands of the job and the landscape. This guy was not and he inconvenienced her a great deal. She was not about to have that and she had to punish him for it. She did it with her shit as she made him eat the poo and drink her pee too. He stopped being an inconvenience to her.