Lady Scarlet and her friends had an issue with this guy and they chose to dominate as well as degrade him. They chose to do it with their boots and that is what ended up happening. The mistresses used their boots to stomp and humiliate him all over his body. He cried as he did not expect them to do that to him. But they did not care what happened to him.
Lady Scarlet does not like rude people and this guy was rude to her. She did not do anything to him and she was shocked that he dared to be rude to her. So she did what she does to people like him so as to send a message. The mistress forced the guy to lick her boots and also to endure her trampling and by the time she was done with him, she was sure he would not do it again.