This mistress was not ok with how horny her husband was. She was tired of having sex all the time as it left her exhausted since he was always in the mood day in day out. She had to make him get another hobby and that is why she spanked him when he went to her wanting sex. He was erect but she spanked his bottom to make him lose the erection.
Mistress Black Diamond will never fail in the torture department, because she is the queen. She is one of those mistress's that loves to inflict huge amounts of pain, because she doesn't give a fuck about her slaves. She also loves to get out her whip and beat some ass, or until her well trained slave is begging her to stop. However, it's up to her what happens.