Lady Stefanie found out that this guy was cruel and she did not like it. He was cruel to someone else and not her. But she took the chance to intervene and help the other guy. So she used her hot looks and naughtiness to disarm the guy and slowly work towards humiliating and dominating him. The mistress wanted to make sure he stopped his cruelty to others by making him feel what it was like to be on the receiving end.