This mistress was enjoying herself when this guy came out of nowhere and disturbed her peace. She tried to ask him to go away and leave her alone but he did not listen. So she had no choice but to punish him and she did it with her facesitting. He felt pain as she did it and he choked a little before the mistress was able to let him go.
These mistresses did not like how their male colleague acted. He was perverted and he made them uncomfortable. They felt like he needed to be punished so that he would stop. That is why the mistresses chose to facesit on him with their jeans. He was in a lot of pain and he was also humiliated but he could do nothing about it. He had to endure the humiliation and promise to change.