Miss Jessy and her slave were in the house when she decided to humiliate him a little. She even told him she did not want to abuse him like she used to. She just made him lie down and she lightly used her high heels to trample him on the cock and on the face. When she was done with him, they watched a movie together. That is how they are nowadays.
Madame Marissa wanted to prove that she still had it. She took her slave to the kitchen where she did all sorts of things to him. She made him lie down and she used her high heels to trample him and make him feel lots of pain. She did not care about his wellbeing. Just wanted to prove to herself that she could still do it better than anyone else.
Aga wanted to have this loser of a guy stop trying to seduce her. She did not want to see him ever again. He was not responding to her polite refusals. So she decided to do it in a language he would understand better. She trampled him with her high heels and left him in a lot of pain. After she was done with him, he never bothered her again.
Stella loves her high heels because they make her look gorgeous but at the same time they are a tool for punishing or humiliating her slaves.