2(Yu-Gi-Oh)

An Au where Jaden and Syrus knew each other since childhood but for job reasons(or because of Syrus' brother), Syrus and his parents had to move away but they promised to one day meet again.

Which happened when they both entered the Duel Academy, at first they hadn't recognized each other but once they did, Jaden hugged Syrus and told him about how much he missed him.

They soon acted just as they did as kids and were always glued to each other to the point their roommates and others from their dorm, started to assume they were dating and soon people from other dorms(even teachers) started to think or believe the same.

Chazz didn't antagonize Jaden because of his crush as Asuka while finding Jaden attractive, everyone believed him and Syrus to be together.

But the truth of them not being actually dating, was revealed when Johan appeared as he openly flirted with Jaden in his first meeting which was waved away by him being friendly by Jaden before Syrus pointed out that Johan was flirting to which Jaden blushed.

This encouraged Johan to flirt more with Jaden but getting to know Jaden also included getting to know Syrus and soon Johan had a crush on both of them and flirted openly and often with them.

Anything else is up to the writer but I just love Syrus and need more with him and also ship him with both Jaden and Johan.