Mistress Luna does not like people who are lazy and when she noticed that this guy was, she had to torture him and she did so with her chastity humiliation fetish. That is why she did what she had to do and she made sure that the guy learned his lesson the hard way and he never messed up again after that. He became hardworking after what she did to him.
Mistress Luna wanted to make sure that this guy would never be a spy again. He had been spying on her and she did not want to let him get away with it. She had to know who he worked for and what he had collected so far. She had to torture him for him to give her the info. So she used a strapon to fuck him in the ass until she got what she wanted.