Lady Stefanie is someone who is conscious of her time and she does not like how slow her slave is. She feels that it stems from his laziness and so she set out to change that. She painfully humiliated him by making him her foot slave. As he licked her socks and smelled her feet, she also trampled him and made him realize it was time to do things differently.
Lady Stefanie used her high heels to scare the shit out of this loser and then she told him that if she was to let him go, he would have to pay her. And that is why she made it a little bit painful so that he would want to pay her to end the misery he was feeling. He felt relieved when she let him go but he had to part with a tidy sum.