Madame Marissa wanted her boots licked clean. That was because this loser had messed up and she wanted to teach him a lesson. She expected him to clean her boots when she came home in the evening so that they are ready in the morning when she wore them. He had not done so and her boots were still dirty when she wore them. So he had to lick them clean.
Madame Marissa used her smelly foot to dominate this loser. She did not care that he had not done anything to deserve the punishment. All that mattered to her was that she had fun at his expense and that is what she did. He cried but she turned a deaf ear to his cries and went on trampling him and making him lick the soles of her feet as well as those of her boots.