Captured By the Cthulhu by Ivy Sparks

You’d think my biggest problem as a lighthouse keeper would be the drunk tourists. Yeah, no. It’s actually the infuriatingly hot cthulhu who’s decided I belong to him.
Cape Tempest has a history written in sea monster blood. So when I discover a wounded cthulhu in my boathouse, I know I should run.
Instead, I tend to his injuries.
I didn’t realize helping Roark would earn me his eternal devotion and protection. And I especially didn’t expect him to thank me with sensual worshipping…
Letting him stay risks my place in this town. But the thing about cthulhus?
Once they get their arms around something they want, they never let go…