Maybe someday that will change. Maybe I'll get bored with you, be less and less inclined to let you out and play. Maybe I'll stop caring so much about your frustration. Would it stop it from growing?
Maybe I'll take other lovers, other slaves. Would you love me the less for it?
It's an interesting thought. As long as I have the keys to your sex life, I can barely help but give you what you want. And I'm keeping those keys. There's no way I'd let my control over you slip, not when you've given so much to make it happen.