When mistress BlackDiamoond makes up her mind to punish and torture a slave, she does it to her best ability. When she was punishing this slave, she clamped his nipples painfully before whipping his naked body. She did it slowly so that she could allow the pain to sink in before doing something else or whipping him again. She had a lot of time on her hands and she used it to torture her slave.
Mistress BlackDiamoond wanted to show this slave the consequences of his actions. She first of all made sure he was naked before she started her punishment. She invited her friend and asked him to sit on his back as he went down on all fours. Then she whipped him painfully all over his body. When she was tired, she asked her friend to take over and whip him as she deemed fit.