Goddess Kiffa needed to trample this guy and that is why she turned her high heels into a punishment tool and she had a great time using them to humiliate and degrade this guy. He cried as she crushed his nuts and he wished that he had never messed with her. He screamed as well but that did not make her stop what she was doing. He got the message loud and clear.
This slave thought that since he was well built, goddess Kiffa would be impressed and he would avoid doing anything to him. But he was wrong and she made sure he learned his lesson. The mistress cruelly tortured him and made sure he was not only in pain, but that he was also not going to take anything for granted. He had to behave the way she had asked him to.
Goddess Kiffa wanted this guy to learn to mind his own business. He had tried to do things she did not like and since she was not going to let him get away with not minding his business, she used her high heels to trample him. The pain he felt as she dominated him taught him never to mess with her and to learn that minding his business was of paramount importance.