its a oneshot where the seme gets drunk and next morning wakes up naked and only remembers that he had sex with a man but cant remember who.. so he starts looking for him and its actually his close friend(the uke) but the uke doesnt tell him. So the seme thought it was someone else and agreed to go out with him and then the uke told the truth.
Seme rejected the uke before graduation and after some years they meet at the same school where seme says he always loved the uke. There was a second couple too. read it a little while ago cant find it anymore ;-;
Ff
Following
http://www.mangago.zone/read-manga/miraiken_de_ai_o_tsumugeba/ maybe? sounds similar
Sorry following. Idk but I feel like I've read that kinda story long ago