Mistress Dula did not want to let this guy spank her and she was fed up with the way in which she humiliated him. She was not ok with how he did not want to acknowledge that he had done wrong. So she made sure that he ate her shit and that he drank her pee before she was done with him. He never spanked anyone else after what she did to him.
This guy was a coward and madame Ellen did not like cowardice. She had to deal with him the way she knew how. That is why she opted to cruelly torture him and she did not hesitate to do it. It was degrading as she made the guy eat her shit and lick her asshole clean. He never saw it coming but he had no choice other than to stop his cowardice.
Mistress Wael likes being cruel to people who mess with her. She did not like what this guy had done and so she had to show him what the punishment for his crimes was. That is why the mistress chose to shit on him and she ensured that he ate her poop and drank her pee before she let him go. The guy never forgot what she did to him.