Lady Fatale did not like how this guy did things. She was pissed off at him because he was difficult and he did not like to be told anything. That made it hard to correct him and that is what this mistress had to do. The mistress chose to humiliate him with her shit and she ensured that he learned his lesson the hard as she asked her friend to help her shit on him.
Lady Fatale made this guy watch as she played with her own clit and her pussy. He was super turned on and he thought she would get horny and she would want his dick. But it did not go down that way. It was totally different and he could not have guessed it even if he had been given the chance to do it. She made him eat her shit and he could not believe it.
Lady Fatale shit on this guy without having any issue with him. She did not even know him and she had to make sure that she dominated him. The mistress used her shit to put the guy on notice that he had to change. He did know that it was a thing and he was shocked that it was done to him. He had to lick her asshole and could not say no.
Lady Fatale needed to convince this guy to do something for her but she did not want to use too much effort to do it. That is why she chose to use her shit fetish to do it. It was super funny for her and she chose to also do it for her own fun and entertainment. That is how the guy found himself eating her shit and licking her asshole.