A mistress is a woman that won't take no for an answer. When she tells her slave to clean all her shoes and he doesn't, she is happy to punish him. She brings him into the punishment room and binds him. She brings him to his knees and puts her shoe to his mouth. He is to lick it clean or he will get kicked in the balls with her high heels.
Miss Sierra knows how to trample her slave's egos and feelings. She doesn't care how they feel because once they become her's, she will tell them how to feel. She shows a new slave this concept when she orders him to lick the soles of her shoes. She talks ugly to him while he licks her soles and gets his balls kicked repeatedly. He learns she knows best and what his feelings are.