Mistress Dula and her friend knew that this guy had a thing for their asses and he wanted to fuck them. But they were not into him and they did not want him to smash them. However, they knew that he was a prime target for their humiliation and that is why they did what they had to do. The mistresses made sure that they cruelly teased and denied him as well as humiliated him with their asses.
Mistress Dula needed to teach this guy a lesson and she wanted it to be done without touching him. That is why she had him do things to himself but under her instructions. The mistress laughed at him as he did what she asked. She even recorded him as he did it. In addition to that, she made fun of him in the process and it was all fun for her. But it was humiliating for him.