Mistress Iside had talked to this guy and they had agreed that he was to do certain things for her. But he ended up betraying her and she did not like it. She had to torture the guy and do it in a way he would never forget. That is why she chose to tie him upside down while naked and then slap the shit out of him to make sure he fixed what he had done and that it would never happen again.
Mistress Iside felt that she needed to punish this guy and stop him from being perverted. The mistress felt that the best thing for her to do to this guy was to punish him so as to ensure that he learned his lesson. And he had to learn it the hard way which he did as the mistress slapped the shit out of him while he was naked. He was never perverted again.
Mistress Iside was shocked to learn that this guy had disobeyed her direct orders and she knew that if she was not careful, she would find herself not being respected by anyone and so she came up with a drastic was to make sure she was obeyed by all. She slapped the guy as painfully as she could since she knew that he would not do anything about it and that he was tied and helpless.
Mistress Iside did not want someone who did not know how to handle pain. So she had to make sure that the guy was hardened and she did it with her slaps. She slapped him repeatedly and she did it despite his cries of pain. She told him that if he braved them for a few days, then the rest would be easier and he would not feel a thing.