This guy took it for granted when these mistresses asked him to do stuff. He thought that he could do whatever he wanted and get away with it, but he realized that that was not the case. The mistresses chose to use him as an armpit licker. He had to lick their armpits, and they ensured that he did it all as per their instructions, despite their armpits being sweaty.
Lady Nora felt that this guy was unprepared and she did not like that. She did not want someone who just passed through life without any care or preparation whatsoever. That is why she had to do whatever she could to make sure that she dominated as well as humiliated the guy. He had no choice but to do whatever it was that she to do to make him never repeat that mistake.