Mistress Rada wanted to have her ass licked and that is why she chose to dominate as well as humiliate this loser. She was out to make sure that the guy never messed up with her again. All that she wanted was to have fun and that she made sure was achieved by the time she was done with the girl. She had never known that she could have that much fun with ass licking and heavy facesitting.
This mistress was bored and since she was a sadist, she chose to have fun at the expense of this guy. She flirted with him and got him to think that she was interested in him but instead of having fun with her, he had to endure her facesitting. She had a great time at his expense and he was not sure whether she wanted him or she was humiliating him.