Lady Nora needed to find a way to dominate this guy and that she did it in a way that he had never felt before. That is why she thought that the best way to deal with the guy was to turn him into a human credit card. He had to bankroll her and he did as she had control over him and she used that control to make him a paypig.
Lady Nora was out to dominate this guy and she did it without caring what the guy thought or felt. She was out to have her own fun and that is exactly what she did. The mistress did not just have fun, but she also made money from the paypig as she had fun at his expense. He was made to pay for what she did to him and he had to do it.
Lady Nora needed to pay back someone but she did not want to do it from her pocket. She had to come up with a way to do it and so she did it with her findom pov. She turned this guy into a pay slave and she got the money from him as he was her human atm. He could not do anything about it and had to do as she asked him to.