Moonfire: Dark Shifter Romance. Wolf King Chronicles, #2

Every twenty-two years, the Red Fire Moon rises-and something ancient stirs beneath the Shroud. Ember Hale never asked to be the flame-born key to a prophecy written in blood. She didn't choose the alpha bound in chains, or the boy-next-door wolf whose quiet devotion burns just as fiercely. But choice was never part of the design. As Ember's power awakens, so does the force hunting her. The bond between them deepens-dangerous, consuming, impossible to ignore-and the prophecy carved into her bones begins to unravel.
Caught between two alphas, a rising power she cannot control, and a fate that demands sacrifice, Ember must decide what she's willing to become. Because fire doesn't belong to anyone. And some flames aren't meant to be tamed.