Married, but fantasized about fucking a friend [MF]

(My first story, please be nice ?)

A little back story: I have a friend, who I’d always fantasized about fucking. We’ve known each other a long time, but hadn’t seen each other in person in years. Online flirting, exchanging dirty pictures and stories happened, but we never got the chance to hook up. Over the years, we dated other people, and I eventually got married. After a few years married, my sex life had gotten bland and boring, so I began looking for other avenues. I never dreamed of cheating on my husband, but fingered myself frequently to porn and erotic stories.
My friend and I recently reconnected and again, I shamelessly flirted even though I was married, careful to behave just enough. But I had always fantasized about fucking him. As time progressed, we talked more in depth about our pasts and fantasies. It got to a point where he knew more about my past sexual adventures than my husband. I almost always ended up fingering my pussy during and after our conversations. I was always afraid of crossing the line, but the fantasizing about fucking him got more and more frequent.