I once had a fantasy about Barbara Walters, for crying out loud. Desires can even change on a daily basis. I turned out almost clinically straight, but my secret fantasies, like yours, can go weird places even within my boundaries. And, probably, so are you. And there's not much we can do about it.
Psychology is less a set of sciences than monastic orders.
You are what you are. What we can control is what we do with our sexuality. We can do the squishy mambo with any agreeable primate, or we can nurture a friend and companion. We can masturbate on other people's organs, or we can spend our lives with one lover and learn each other's hearts. Or we can bond for a lifetime and work to build a family for another generation.