This contractor was supposed to deliver the project in 4 months but it was the third month and he was only halfway. Mistress Iside did not want the additional costs of delay being passed on to her and she had to make sure he doubled his effort and finished the work as soon as he could. That is why she went out of her way to tie him up and slap the shit out of him.
Mistress Iside wanted to make this guy learn that he could not go around doing what he wanted while disregarding what he was told and how he was required to do things. So she used her faceslapping fetish to deal with him and it did not take her long to tame him and to degrade him. In addition to faceslapping him, she also ballbusted him to make it even more painful.
This guy wanted to date mistress Iside. She did not mind him but she wanted to test him to find out whether he was suitable for her. She wanted to find out whether he really wanted her and whether he was a sissy. This she did by slapping him hard and watching his reaction. She was shocked to realize that he braved it all and did not make a sound. She agreed to date him.
Mistress Iside wanted her slave to stop the nonsense she had told him to stop many times. She had noticed that he was not taking her advice seriously and she had to change tact. She did so and hard slapped him cruelly. He was tied up so he could not block the slaps. That was when he realized he had messed up and he had to change because he did not want to be slapped again.