The humiliation of the punishment, the fact that she was punished for not reason, instead of being bound by restraints his sheer will had kept her there, restraints will not allow you to leave, but the fact that she was not held but rather held herself it will be all the more humiliating, words are stronger than bonds.
The fact that he did not take her sexually just laughed at her making her feel worse, she was not even worth being taken, and when she wanted the relief of the orgasm. The fact that she wants to go back, that she is longing in her mind and body to be back there punished again and taken, as his toy makes her blush with self contempt. just a few ideas, hope they help, Im not really good at thiis. Good luck can't wait to read.