Mistress Liza had to control her slave. He was too horny and she wanted to punish him, humiliate him and at the same time give him the release that he wanted and that he needed. That is exactly what she did to him by trampling his dick with her boots and letting him fuck her leather boots. He had to cum before she let him go. He got the message.
This mistress had beef with her neighbor and she felt that she had to humiliate him for him to learn his lesson and stop being a shitty neighbor. So she stripped him naked and she forced him to fuck her high heel boots. Thereafter, she used the used the same boots to trample him and to also crush his balls and his dick before she felt that he had learned his lesson.