This mistress had a sneaky assistant and she did not want to let the assistant continue with the behavior she had. She had to take care of her and she did so painfully. She used her hard trampling fetish to do so and it was super fun for her but the same could not be said of the assistant who had to endure all the pain and humiliation of it.
Madame Marissa was not pleased with how insensitive this guy was to her. She felt that he had crossed a boundary and she had to punish him for it. The mistress did not want someone else to do that for her so she took matters into her own hands and she used her boots to hard trample him and make him realize that he needed to exercise some sensitivity. He got the message.