Collision

It's been four years since Katara and Zuko last saw each other. Four years since they shared a drunk kiss before he left to save the world. And after a mutually traumatic run-in at the local tea shop, it would appear certain things remain to be resolved...

Modern-day AU - Zutara meet at university, then spend four years apart before dramatically reuniting for some fluff, angst and past-and-present narrative tense.