Theirs

I am sex.
I have built my image, client by client. I call myself successful because they call me mistress.
It doesn't matter who I am involved with. My arrangements always start with a contract. No exceptions.
Until them. The sweet couple walked into my class and shook everything up.
Luke wants to be dominated. His wife, Camila wants to dominate. Who am I to say no to a couple who is eager to learn?
Except contracts aren't made to protect feelings, especially the ones I never saw coming. They have what I want—what I've been missing. But I'm what they want.
Can I let them in? Or will I always be on the outside looking in?
This is an FFM romance for mature listeners.