When lady Karame saw this guy, she saw someone at who's expense she could have fun. That is why the mistress chose to turn him on and make him lick her bare feet and her stockings. The mistress made sure her feet were smelly before she had him do that. He thought he would get lucky but that did not happen. She had fun at his expense and then chased him away.
Lady Karame did not want to physically punish this guy. He was an abhorrent person and she felt that to tame him permanently, she had to do something that would have long term effects. That is why she chose to destroy his ego and make him doubt himself. She made fun of him and made sure he cried and felt like a small person especially because of his tiny penis.
Lady Karame wanted to do the kind of things that she has never done before. She is not a cruel person but this time, she had to be. And she did it by using her high heels to trample and dominate this guy. She did it because she was being taken advantage of by people and she had to grow a pair and teach them a lesson when they did so.
Lady Karame wanted this loser to learn a lesson he would never forget. She caged him so that he would get cramped. The mistress then got him to lick her boots while inside the cage. She sat on it while he struggled to find a suitable angle in the small cage to lick her boots until they were as clean as she wanted them to be. He learned his lesson when she finally let him go.