Mistress BlackDiamoond wanted to try something different. Being an adventurous mistress, she is easily bored by routine. So she decided to have two slaves. She made one slave humiliate the other by inserting a dildo in the other's asshole. When he was done, she made the other slave do what was done to him. When they finished, she humiliated both of them. It was the best humiliation she had ever done.