Mistress Medea was angry at the way this guy was ungrateful. She had done a lot for him but he did not see it. All he wanted was for her to do him more favors. She felt used and she had to put an end to that nonsense. She did so by dominating him. The mistress lured him with her sexy ass and teasing before she humiliated him, teased and denied him then trampled him.
Mistress Medea had tried to talk to her slave to have him change his ways but he did not seem to listen to her. He thought she would not do anything to him and he was mistaken in that. The mistress had to change tact and that is why she went for a strapon and she used it to ass fuck him. He changed immediately as he did not want a repeat of that.
Mistress Medea was fed up talking to her slave as he was stupid so she turned his head into her human seat and she sat on him for fun. The mistress enjoyed dominating him as she thought of the best way to deal with him. If the situation persisted, she knew she would have no choice but to let him go. But in the meantime, she enjoyed dominating him for fun.