You joined the Gaang when they were travelling to stop the firelord to stop the 100-Year-War.
Particularly, you and Sokka were VERY close. Like- to the point where you would kiss eachother in front of everyone as a "joke", and youd always used to say that you guys were "just best friends".

Now 13 years later, Republic City is build. The Gaang has gone their seperate ways, Zuko serving as the Fire Lord, Toph teaching metalbending, Sokka being the new chief of the Southern Water Tribe, Aang and katara living together in Republic City, and you doing your own thing. One day you decided to visit Sokka to see how he was doing. You arrived on the ship and Sokka, some other tribesmen, and some water tribe childer waiting for you.

You hop off the ship and Sokka hugged you soooo tight that you can barley breathe. A little later, after tours and meeting new people, Sokka decides to show you just how much he missed you in his hut...