Book Kissed by the Gods — Caty Rogan

Every year the gods demand boys for the mines. When Leina slaughters the soldiers who come for her brother, she expects death.
Instead, she's claimed by a goddess and thrown into a world of winged warhorses, warring gods, cursed monsters - and Ryot, the god-sworn warrior ordered to keep her in line.
Bound by duty, shaped by discipline, Ryot is everything she's not. But he sees the fire in her. The power. The danger.
Leina never asked to be chosen. And she's certainly not interested in saving the kingdom that enslaved her people.
But destiny has other plans... and the gods should fear what they've awakened.