Breath of Fire- Amanda Bouchet

When Catalia "Cat" Fisa’s carefully guarded identity is revealed, her life is turned violently upside down. Griffin is stunned, and their passionate vow to live together or die trying is put to a new kind of test as they fight to reunite the three realms. With Cat’s past surfacing in unexpected ways and neighboring royals out for blood, Cat and Griffin must strike soon if there’s any hope of achieving their goal without full-scale war. When they’re forced to enter a deadly competition, Cat and Griffin will emerge side-by-side in the heart of their future kingdom...or not at all.