This guy wanted to cum but this mistress did not want to fuck him. What she knew was that she had to take advantage of him and get her hands on his money. So she turned his request into a jerk off instructions session where she helped him to cum. She also teased him with her hot body and he came. But he had to pay her for her time.
Mistress Cat was out to dominate and she did not hesitate to do it. The mistress knew that the best thing she could do to this guy was to make him humiliate himself. So she teased him with her ass and had him follow her instructions in order for him to humiliate himself. That was better than if she would have done it to him. And she told him so.