Demon for the Win by Meghan Maslow

Dryad Tuli Cato has 3 rules he lives by: No relationships, no drama, no trouble.
When a gorgeous incubus offers a night of no-strings passion, Tuli readily agrees. Only that no-strings night sure feels like a lot more.
Okay, Tuli has 2 rules he lives by: No drama, no trouble.
Being the sous chef at the most exclusive restaurant in town makes no drama a challenge. Especially when the kitchen’s in an uproar after a staff member turns up dead. Murdered.
Um, Tuli has 1 rule he lives by: No trouble.
Surely, he can stick to this 1 simple rule. . . except it turns out, he might be the murderer’s next target.
Incubus Kem Balthasar has only 1 rule he lives by: Enjoy life.
It’s a lust demon’s nature, after all. Creatures either want to be him or do him. Or maybe a bit of both.
When Kem lays eyes on a slender dryad hottie across a crowded sex club, suddenly he’s thinking of another L-word and it’s not one he ever thought he’d feel.
Okay, Kem has 2 rules he lives by: Enjoy life, romance Tuli.
Convincing the skeptical dryad that Kem’s a worthy—and faithful—partner is hard enough. But it’s even harder to date a guy who might wind up dead.
Right. Kem has 3 rules he lives by: Enjoy life, romance Tuli, and keep the little dryad safe.
Easy, right?