Mistress Medea felt that her slave was disgraceful and she was not going to let things go. She had to punish him because she felt that he was getting used to doing disgraceful things. That is why she opted to dominate him and teach him something he had never been taught before. He had to swallow her saliva as well as endure some choking from the mistress who also teased and denied him.
Mistress Medea has a hot ass and she gets a lot of compliments on a daily basis. It got to her head that she used it to humiliate some of those who were into her and her ass. The mistress turned this guy on with a little teasing and flirting. The guy took the bait hook line and sinker. By the time he realized that he was being humiliated, it was too late.
Mistress Medea was pissed at how her supervisor picked on her. She did everything right but he never failed to get a reason to humiliate her and find fault in her. She was fed up and she was ready to lose her job. But before she did, she hunted him down and she fucked him in the ass with a strapon to make him realize that she was not going to accept such treatment again.
This mistress wanted this slave to be punished and she did not bother to invite someone else to do it. She knew what was needed and how she wanted him to behave going forward so she used her smothering fetish to dominate him. He was in pain and he was humiliated and that is what pushed him to agree to do things the way the mistress wanted them to be done.
Mistress Medea knew this guy was not gullible but it was her intention to make him one. And she did it by teasing him with her hot body and the way she was seductively dressed. He could not resist her and that is how he fell for her trap. She managed to make him humiliate himself for her sake and she had a great time watching him do it without any clue that he was not turning her on but rather humiliating himself.