And here begins the cliche. Because there's just not enough modern highschool setting fics out there.

Three years after the war, the work still isn't quite done and the Gaang is scattered across the continents in their efforts to help the world recover. When Aang and Katara pay visit to the Fire Nation where Zuko is Fire Lord and Sokka acts as Ambassador for the Water Tribe, sparks fly between the siblings over Sokka's life choices.

On a shopping excursion, Zuko discovers a little secret about Sokka and a dress provides a unique bonding experience.

Zuko doesn’t have time to deal with pressure for an arranged marriage, especially since he isn’t even sure he likes women that way. (A realisation that has absolutely nothing to do with Ambassador Sokka - shut up, Suki.) Katara and Aang have broken up again, and the Northern Water Tribe are pushing for a match between the North and South. Which leads Zuko and Katara to develop a genius, foolproof, only slightly drunken plan: they can pretend to date for the length of Katara’s stay in the palace, giving them both a brief reprieve from political pressures on their love lives. What could go wrong?

‘…H-how am I still alive?’ Zuko thinks. Sokka flinches back. Whoaaa, how in Spirits name did Zuko project his voice like that? Sokka didn’t even see him move his lips. As if he can hear Sokka’s thoughts, Zuko turns his head to look directly at him, eyes bewildered. And this is where Sokka realises something is very, very wrong. Two minutes later: “No way!” Sokka shakes his head wildly, just as prince jerkbender across him curses. “I’m soul bonded- To him?! No way! That’s just spirit mumbo-jumbo!!!” -or, through some freak Spirit accident involving Zhao, the Avatar, and the continuous joke that is both their existence, Sokka and Zuko have been soul-bonded and mentally linked. Neither of them are particularly happy with this.