Lady Victoria wanted to use her chastity humiliation to dominate as well as humiliate this guy for being mouthy. She had to send a message that he was not willing to hear from her and that is why she did what she had to do. He was not ok with it but she did not care. She had to ensure that he learned his lesson the hard way and that things worked out the way she wanted.
This guy was nonsensical and lady Victoria did not have the time to entertain him or any of his nonsense. She had to make sure that she dominated him and he was humiliated in the way she felt that he deserved. So she tricked him into wearing a chastity device and she had fun controlling his dick and what he did with it. She even teased him with her pussy but in a thong and he got hurt as his dick expanded and got hurt by the device.