The Bone Flower Queen by TL Morganfield

Having defeated the sorcerer god Smoking Mirror and reclaimed her throne, Quetzalpetlatl and her brother Topiltzin set out to found Quetzalcoatl’s new holy city and end human sacrifice throughout the Toltec world.

But Smoking Mirror hasn’t abandoned his own ambitions for power; with his allies–mortal and divine–threatening war among the gods, he’s shifted his focus to Quetzalpetlatl and her budding magical powers. Along with her deep, personal connection to his hated enemy Quetzalcoatl, she would be the perfect addition to his ranks, if only he can convince her that she’s working for the wrong side in this conflict.

And he knows the one secret that will tear apart everything she thinks she knows about her beloved god... and herself.