Omg! Someone who understands the difference between sexual desire and sexual attraction! And, yes, I hate the biphobia and bi erasure that occurs far too frequently in this kind of story.
But that’s exactly the sort of story it is. It told you itself when the seme specifically mentioned he’s not into men and literally only slept with the uke out a combo of boredom, curiosity, and annoyance. He even almost phrased it that way out right in his monologue.
I hope he’s bi and this story isn’t a “I’m straight but ur an exception” type of thing