I don't really much about the yaoi manga except for the side story chapter. The side story has this high school student who's blond and has the pompadour hairstyle. He's an uke and unlike his image, was really nice. Anyways because of his hair, he was always mistaken for being a delinquent and was forced into fights. Since he's always forced into fights, he's pretty good at fighting. Oh! And he was best friends with the main couple

"Kimi Shika Minai" (Chapter 2) by Honjou Rie?

That's it!!!!!!!! I've been looking for that for almost a year now DX thank you so much!!