Surging Reef by Holly Day

One day, Kazimir is gonna live in a lighthouse, but until he can afford to buy one, he’ll simply have to satisfy his need by breaking into abandoned ones.

For years, Kazimir Wrenley’s dream has remained the same — to live in a lighthouse. He saves every penny he can to make it a reality, but lighthouses aren’t cheap, and they aren’t on the market all that often. Together with his trusty sidekick, Pharos the border terrier, he visits all the lighthouses within reasonable — and unreasonable — distance.
Ashby Kalen pissed off the wrong queen, namely the vampire queen, and now he’s chained up and starving in Surging Reef, an abandoned lighthouse. No one gets out of there alive, so when a human saunters in as if he owns the place, Ashby is sure he’s hallucinating.

Vampires don’t exist, Kazimir knows that, but he can’t explain what he’s seeing with any other word. Vampire or not, he’s not leaving a living being chained to a wall. Ashby can’t believe his luck when Kazimir is willing to help him escape, but will they make it out before the queen catches them?