Madame Marissa knew that she had to head home and trample her slave. So she had to prepare as adequately as she could. She did this with her high heels after she had walked in them and made them a little dirty because she wanted the soles to be licked before she used the heels to trample the guy. He got the message she was telling him and he never did it again.
Madame Marissa did not want this guy to think that it was ok to do what he had done. She chose to make him lick her feet and especially her toes so that he learned his lesson and that he never angered her again. The mistress warned him that if he did not change, he would have himself to blame for what she would do to him and how she would punish him.
Madame Marissa needed to ass smother this guy and she did it with her hot ass. She had to make sure that she tortured the guy and that she humiliated him as much as she could. He never thought it could go down that way but it did and she was unforgiving to him. He cried and begged her to stop but she did not stop. He had to learn his lesson and he did.