Mistress BlackDiamoond was paid by Lady Chanel to show her to humiliate and torture a slave properly. She agreed to it and got a slave. She showed lady Chanel how to use high heels to trample all the painful parts of the slave's body. Lady Chanel was excited at what she learned even though she was an experienced mistress herself and she applied that knowledge. The slave cried in pain but they ignored him.
Mistress BlackDiamoond did not take it kindly when this guy made fun of her at the gym. She pretended not to be offended and even befriended him. She is one mistress who keeps a grudge so she lured him to her house where she turned him into her human treadmill. She trampled him using her high heels and did it on his naked body. She told him never to make fun of anyone again.