Madame Marissa felt that she was dealing with a guy who was not serious. She was not going to let him get away with the things he did and that is why she had to torture him in a way he had never been tortured before. So she stripped him naked after which she whipped him painfully. She let the whips land indiscriminately on his body and he felt pain he had never felt before.
Madame Marissa felt that her slave was a sissy and he needed to be toughened up. That is what she did to him. She whipped him while he was naked and she made it a cruel and painful affair for both of them. The mistress made his body all red and full of blisters. He cried but her house was sound proofed so no one heard his scream as she whipped him.
When madame Marissa noticed that her slave had not been doing the kind of things she had asked him to do for her, she was pissed. She noticed he had been trying to manipulate her so that he could do only what he wanted to do. That was not ok with her and she punished him by whipping his bare back. She did it painfully and brutally until he changed.