And sexuality changes. Horny kids can later become faithful partners. Divorced adult singles sometimes become promiscuous. Lifelong heterosexuals occasionally have unexpected homoerotic impulses and vice versa. 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.