Mistress BlackDiamoond loves to humiliate slow slaves and she did that with her spit fetish. She chose to dominate him because she had tried to make him improve but he did not seem to make any improvements. She had to come up with a different way to deal with him and she chose to do it with her spit fetish. He cried as she spat on him but she warned him that she had worse things she could do to him if she wanted to.