Mistress BlackDiamoond knows how to train guys to be strong. And she was asked as well as paid a lot of money to toughen up this guy. The mistress went ahead to do it and she gave it her all. The mistress used her high heels to inflict pain and she also pulled his nipples before she rode his back. As far as humiliation was concerned, she made him lick her soles. And she did this over several days until he got comfortable.