The Dilemma at 40: A Taboo Fantasy Comes True

I've always had these fantasies about my younger brother's best friend, ever since I was young but just as a kid would think. Recently, after too much wine and alone time, the desire hit me again, this time with real potential. We ended up talking it out one night when he visited, both of us adults who agreed this could be a one-off thing without expectations or complications for our regular lives. I'm in my forties, married to someone else, but that night was a reminder that there's more out there than meets the eye. No regrets, just a weird turn in an otherwise stable life.