Kazmyr: Molten for Her by Zoey Indiana

I investigated arson. I knew how to read fire.

But nothing could have prepared me for Kazmyr—an alien warrior who was fire, scarred and dangerous, with eyes that burned hotter than any flame I’d ever chased.
The Intergalactic Dating Agency said we were DNA-matched. I said they were insane. I wanted nothing to do with a man who radiated the very thing that haunted my nightmares.
Except pirates were hunting me, conspiracies were closing in, and the only safe place was in his molten-hot arms. Kazmyr was my enemy, my protector, my obsession. He promised to guard me, but his touch scorched me until I couldn’t tell if I was burning up from fear… or desire.
And the worst part?
The longer I stayed with him, the more I wanted to play with fire.

A scarred hero. An enemies-to-lovers bond. High-heat instalove with fire that won’t be contained.