Lady Tanja likes to deal with straight people and that was why she felt pissed to find out that this guy was crooked. She had to show him what happened to people like him. He was humiliated financially because the mistress felt that financial humiliation would cut deeper than pain or any other form of humiliation. And she was right since the guy was a miser. He felt the financial humiliation.
Mistress Harley was not happy with how she had been treated by this loser. She knew he loved women like her but she had not shown her body when they had met earlier. This time she showed it to him but in a different set up so he did not know it was her. She has a banging body so he was distracted. She took advantage of it and she financially dominated him as payback.