Goddess Nika realized that she had stiff competition for a contract from this organization and she knew that she had to find a way to deal with it and be the eventual winner. She knew that she had something others did not have and that was a super gorgeous ass which she used to her advantage. She used it to entice and tease the guy with the final say and long story short, she got it.
Goddess Nika wanted to degrade this slave and she knew that the best way to do it was to use her sneakers. They were old and they were dirty. So she had him lick the soles and do other disgusting things that she asked him to. She had threatened him that if he did not, she would find worse ways to humiliate as well as dominate him. He got scared and he did what she asked.