Mistress Dula had given this guy some duties to perform but he failed in them. She did not want to encourage him to keep failing in his duties and that is why she had to do something she had never done to him. The mistress cruelly punished him in a way she had never done before. He was stripped naked and forced to endure pain as she used heels to crush his nuts.
When mistress Dula sought to dominate and humiliate this guy, she did it in a way he would never forget. The mistress kicked him in the balls and she ensured that he learned his lesson in a way he would not forget. To make it worse, the mistress had tied his hands behind his back. He feared her and knew she would not tolerate any nonsense from him or anyone else.