Lady Karame wanted to welcome this new guy with some humiliation. She did not want him to think that everything was ok when it was not and that is why she chose to deal with things in the way in which she saw fit. One of those was to humiliate him to get him to learn that he needed to be careful as he could get punished for messing up.
Lady Karame does not like paranoid people and when she noticed that this guy was, she had to punish him and teach him a lesson than he had never been taught before. The mistress stripped him naked and thereafter, she forced him to lick her pantyhose as well as to suck her toes. He was shocked at the things she did to him and that is how he learned his lesson.