What's the Name of That Book??? discussion

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Revel
SOLVED: Children's/YA
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SOLVED. YA Paranormal Romance about a girl moving to a gloomy seaside town full of secrets. Love triangle, fish people, lots of dramatic reveals. [s]
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Girl's family dies, she moves to a small beach town with very gloomy rundown vibes. She finds out there are fish people who once a year come out of the ocean for like a dance/party/ceremony thing where they also choose a woman to mate with. Also, a few dudes from the town have to undergo the yearish transformation into a fish person in exchange for their families being comfortable.
There's a love triangle between Nice Dude Sean/Shawn/Shaun who is a fisherman apprentice and chooses to become a fish person to support his family and some fish guy named Jax/Jaxon/Jace/something with an X maybe?
There's a scene where the main girl asks if she's going to see Fish Guy at the dance at later it turns out she was accidentally asking him to pick her at the dance ceremony.
I think the cover was like a light blue, with white text. The name should only be one or two words.
It was all very generic YA love triangle stuff, but I want to find it because I'm 80% sure it's based on a Lovecraft story and I want to see if I'm crazy.