Goddess Kiffa felt that her slave was shortchanging her and she had to punish him. And her mode of doing it was to turn her into a socks licker. She had stinky socks after she got home from the gym and she used them to humiliate him. He could not refuse as he knew that would attract a worse or harsher punishment from him. So he did it and knew his days of misbehaving were numbered.