This mistress did not feel the vibe of this guy as he hit on her. She tried to politely hint that she did not like him that way but he did not want to take the hint. So she had to make him see it by being more explicit. This was done though facesitting him and farting on him. He choked and that scared him to the extent that he dropped his interest in her.
This guy needed to be humiliated and this mistress did not hesitate to do it. She humiliated him with her farts and he was shocked that she could be so cruel. He had forgotten what he had done to her until she punished him and that is when he realized how he had wronged her and he promised herself that he would not do it again to her or to anyone else.