Okay, I read this a long time ago. The uke and seme was sex friends for a couple of years. I think the seme wanted to try to do it with guys, so he was orginal straight and i think the seme was blond and the uke was dark haired. I also remember the uke breaking up with the seme because he though the seme only though of him as a sex friend.

Is it Shiranu wa Omae Bakari?

Yes it is, thank you 😀