OMG, I've been wanting a story like this! I always found it so sad that Appa would be the last of his kind and that no other air bender would get a sky bison. And I love how you set up the discovery and Jan and Sejin felt like they were actual characters in the show and I like that you have Aang and the rest of the gang doing their own things to help with the aftermath, and still be close. And I loved how you wrote Aang, you could feel him growing up, but still being himself at the same time.

In short, this rocks.