An element of long term domination and ownership that has always turned me on, almost as much as the financial domination, has been the aspect of humiliation and deprivation. Withholding sexual pleasure from your slave while they endure and watch/listen to you enjoy your own sexual freedom. And that is a part of the relationship I want.
To be able to sit back at the end of the day, call you up and go over every detail of my most recent fuck or sexual encounter while you remain celibate for me. Hearing the details of my encounters, or even going as far to pay for those dates knowing you we be restricted from that same pleasure, all in my name and for my own pleasure.