Lady Nataly wanted to use her ballbusting fetish to dominate as well as humiliate this guy and that is exactly what she did to the guy. She made sure that he cried and that he was in a lot of pain so that he would never piss her off. He got scared as she wanted him to be and he did his best to make sure he did not piss her off.
Lady Nataly felt that the best way to humiliate this guy was to trample him. He was out of shape and she felt that she would be doing him a favor by doing so. So she went ahead and did it and she laughed as he cried and tried to beg her to stop. He could not imagine it and he regretted what he had done to piss the mistress off.