Mistress Denise used her jeans to facesit on her brother. He had pissed her off by chasing away her boyfriend. He did not want anyone to date her and he was always sabotaging her relationships. She was fed up with it and she had to do something. She chose to send a strong message to him that she would not tolerate him doing so. And she facesat on him to drive the point home.
Mistress Serena did not anticipate what this loser had done. She found out that he had been giving information behind her back. She was so pissed that she had to do something about it. She cruelly tortured the guy in order to make sure he never did it and that he also told her what sort of information he had given out so that she would know how to counter that.