Wildfire Sea Dragon by Zoe Chant

Wildfires and demons? No sweat.
His bodyguard? She’s the real danger…
Noble. Dutiful. Serious. All words that no one would ever use to describe sea dragon shifter Joe, the Crown Prince of Atlantis.
As the Heir to the Pearl Throne, he’s supposed to be preparing to rule a vast underwater empire…which is exactly why he’s on a fire crew in the ass-end of Montana. Battling raging infernos with his bros is infinitely preferable to wearing a crown. Even with the demons and weird monsters.
Okay, so the forces of evil are getting a little personal. He can handle it on his own, like he always has. The last thing he needs is a bodyguard. Especially her.
The woman of his dreams…
Her only name is Seventh Novice. Everything else, she left behind long ago. If she’s to achieve her dream of becoming a Knight of Atlantis—the first and only one who isn’t a sea dragon—she has to be perfect. Perfectly honorable. Perfectly dutiful. Perfectly in control of the mindless monster who shares her soul.
Which would be a lot easier if she hadn’t been assigned to protect a man with the honor of an alley cat and the common sense of a stunned herring…and a body that drives her beast into a blind frenzy of desire at first sniff.
He’s her fated mate. But Joe’s good at thwarting fate. After all, he’s had a lot of practice…
Because the man that everyone thinks is carefree and careless has a secret.
Joe can see the future.
And if he claims his mate, she’ll die…