Looking for a bl

Hii I'm looking for a bl, I don't remember the name but it's like the uke ships these two guys in his class but the 'uke" of his ship ends up liking him and the "seme " of the ship gets mad when those two start to date. I completely forget the name and I only remember bits and pieces, like the uke just wanted to be a fly on the wall and watch them and how the "seme " of the ship threatens him and everything, if you could help me find it pls let me know