Ashfall by Delta James

He fell from the sky like a god of fire. She was sent to expose him.

When wildfire expert Ember Vale arrives at the edge of an inferno in Arizona, the flames aren’t the only thing acting strange. Suspicious fire patterns. Inconsistent reports. And the Blackstrike Unit—an elite team of smokejumpers with eyes that burn a little too bright.

Especially their leader, Dax Fane.
Dax is everything Ember doesn’t trust: powerful, controlled, magnetic. But when he drops from the sky to lead his crew into hell, she sees something inhuman in him… something that calls to her. She was sent to investigate. She never expected to be hunted by fire or claimed by fate.
Dax knows Ember is his mate the moment their eyes meet. But he’s cursed, bound to a dragon side that grows more unstable by the day. Claiming her might save him. It might also doom her. Especially when a rogue dragon rises from the ashes, bent on revenge, and targeting Ember to get it.
With a wildfire closing in and secrets igniting around them, Dax and Ember will have to choose, duty or desire, survival or surrender. Because the only thing more dangerous than this fire… is the way she makes him burn.

Welcome to Firebound. Where the smokejumpers are dragons—and the only way to tame the flames is to fall in love.