In thirteen years the world is slowing healing. Restoration is possible with a lot of hard work and determination, but a problem arises that no one expected, forcing the Gaang to reunite and save the world before what progress they've made is obliterated.
Severus Snape has been the Potions Master at Hogwarts for three years and is still deep in mourning of unrequited love. The role of mentor is thrust upon him, meaning he has to deal with the girl who has a knack for reviving things. Including hearts.
When you're dead, there's not much you can do save for watch the living and reflect on the past, which is exactly what James Potter as been doing. DH Spoilers.
During the sixth and seventh books, Remus Lupin was rather...distracted. But why? What were his true motives in trying to distract himself with work? For charging headfirst into battle? The answer's simple. The raven. Snupin goodness. :D And DH spoilers.
It seems that whenever he turns around, Zuko finds out something new about his uncle. He constantly refers to him as a fool and after the last countless time, Iroh decides to tell Zuko the story of how he became such a silly old man.
Its a stormy night and our favorite Potions master has nothing better to do than think back to times now past. Especially the only real light he had in his life and where he stands in the battle of good and evil.