In a lot of stories, especially in the yaoi/shounen-ai genre I have found that a lot of times there is some promiscuous or rival esq character who ultimately bring the main character's together--that or a side character reveals to have secret feelings for one of the main couple, but their love ends up unrequited for *their* happiness. Which is why I really love side stories for these characters! (๑•ㅂ•)و✧
I mean they can break from standard romantic plots and can really delve into some awesome material (or kinks lol) and provide an interesting angle of the main couple (which are normally lovey dopey and wonderful but they can't stand them!) Everyone should get their story <3
Sorry, rant over! ╮( ̄▽ ̄)╭
After all we need someone like Sakura to make Hasegawa feel jealous and realize his own feelings towards Yoshinaga (︶︿︶)