Marked for Life (фемслэш)

Aang vanquishes Ozai, but Azula wins the Agni Kai. With their mission failed, Zuko, Aang, and the others have no option but to flee – but Katara is captured. While the rest of the free world continues their war against the Fire Nation, Katara suffers brutal mistreatment at the hands of Azula, who in turn finds her dream of being Fire Lord is not all she wanted, and that Ozai's legacy might be too much for her to live up to. Both Katara and Azula compromise their ideals and goals as circumstances force them to get accustomed to each other.
Heed the tags! The M rating isn't there for no reason. Also please read the opening author's note.
Not a fix-it or a redemption fic. More of a corruption fic, a break-it, but not a dark fic either. This story exists in the grey area between Good and Evil.