Mistress Tink and mistress Cassie are secretive people. But this guy was not and he ended up leaking their secrets. They were no happy about it and they had to dominate and punish him for it. That is why the mistresses had to dominate him and make sure he learned to respect other people's wishes and their secrets. As they facesat him and choked him, he learned his lesson the hard way.
Mistress Milah and her boyfriend argued. She was proven right and she could not let it go. She facesat on her boyfriend as punishment for arguing with her on something she knew she was right about. She humiliated him with her facesits and she got him to learn never to argue with her unless he was pretty sure he would win the argument. She stopped facesitting on him before he choked.