Cathy instructed her slave girl to dominate her slave for her. So its a double humiliating situation for him to be enslaved and dominated by another slave. First she makes him worship and kiss her feet. After that she sits on the back of her slave and rides him like a pony. She put a leash around his neck while she sits on him and he keeps carrying her around the room. Next he is used as human carpet. She stands on his body with her entire weight and makes him suffer under her bare feet. In the meantime Cathy is watching everything and laughing her ass off. She commands her remote mistress and makes her punish the slave like she wants.
