Dragons over Snakes (джен)

A Forward by the Scholar Zuyen:
It has been a long upheld truth of our great nation that after the twin falls of the disgraced Fire Lord Ozai and Princess Azula, and their subsequent imprisonments, neither of the two ever regained contact with our well-respected Fire Lord Zuko. While Fire Lord Zuko ensured the humane holding conditions of his estranged father and sister immediately after his ascension to the throne, he reportedly never saw a need to continue communications with them. Before writing this book, my answer to such an obvious statement would have been, "Blasting flames—well of course he didn't!" Now, though, my answer would be quite different. But best leave that til later.
Fire Lord Zuko, when questioned about such matters, only ever gave one answer in response, saying: “A true leader has no need for snakes and scoundrels. Dragons are far superior.”
Given his far more professional reply, it is no wonder that he was the fire lord and I am a less-than-humble scholar.
OR
Two siblings learning how to be siblings for the first time via letters. And the scholar from a century later who found them.