Any books similar to 'Teeth' by Hannah Moskowitz? (YA)

[Maxie]

Teeth was an amazing read, dark and heavy, yet charming and full of character.
It's author, Hannah Moskowitz, is no doubt a wonderful writer with a lot of skill but due to the topics of her other books I just couldn't enjoy them that much...
Teeth was interesting because it had some fantasy elements, a 'fish-boy', a dark backstory and good dialogue.
I especially enjoyed the dialogue between Teeth and Rudy, and I'm not going to lie, I found myself wanting them to be together romantically, in a way. Turns out I'm not the only one, as on goodreads it has often been shelved as 'LGBT'.

For those who aren't familiar with this novel, I'll give you the blurb.
"Be careful what you believe in.

Rudy’s life is flipped upside-down when his family moves to a remote island in a last attempt to save his sick younger brother. With nothing to do but worry, Rudy sinks deeper and deeper into loneliness and lies awake at night listening to the screams of the ocean beneath his family’s rickety house.

Then he meets Diana, who makes him wonder what he even knows about love, and Teeth, who makes him question what he knows about anything. Rudy can’t remember the last time he felt so connected to someone, but being friends with Teeth is more than a little bit complicated. He soon learns that Teeth has terrible secrets. Violent secrets. Secrets that will force Rudy to choose between his own happiness and his brother’s life."

Are there any other books you can think of with similar themes, or that fans of this book might enjoy? (this question is mainly targeted at people who have read the book, but I'm open to other suggestions of course!)