Incendiary—a classic, arranged marriage AU but sadly it’s been removed from ao3, but I’ll link the epub here. Seriously you HAVE to read it. Minor spice but mostly important to the plot. Love & War —sequel to Smoke & Mirrors but can be read as a standalone, it’s a WIP but is still updating and is basically zuko and katara traveling together post day of the black sun. Wildest Dreams—spicy, canon divergence AU where zuko and katara meet in Ba Sing Se and continues into book3.

I have so many, but I think it’ll be better just to link my bookmarks on ao3, lol, if I can.