Mistress Dula found out that this guy was insensitive and she hated that. She did not want to deal with someone who was mean to others and she had to punish him for it. That is why she went out of her way to facesit him and to teach him a lesson no one else had ever taught him. He was shocked when she called her friends and they all ganged up on him and facesat him.
This guy was too condescending for mistress Dula and her friend to let him get away with it. The mistresses chose to use facesitting fetish to teach him a lesson and to make sure he learned never to piss them off. That is what they did when they tricked him and tied him up. He was then facesat on by both of them and he choked as they did so.