Ultimagirl. And he says so.

“Your daughter was so much better. Not just another hole to fuck, but a willing, hell, eager partner. In fact, I bet if I were to join her in the bedroom we could have quite a lot of fun and given that you came so many times, without any sort of permission, just from getting your ass and pussy punished as they deserve, I think your mistress deserves some fun too, don’t you?” He asked, placing her in a rather impossible position. If she disagreed, Shelby would punish her, if she agreed, she would have failed her mistress.