The Solstice Gift by Cari Z.

How long can a human survive in the treacherous court of the winter fae, when even his allies are fighting for their lives?

Dis is a changeling, a human stolen away from his own world as a child by the vicious winter fae. He’s survived to adulthood through a combination of luck and careful oversight by his only ally, a fairy lord named Marten, but his success might have finally reached its end.
It’s the winter solstice, and Oberon’s court is preparing for a hunt with a history of bloodshed, one that requires Dis to be an unwilling participant. Even if Dis lives through that, he’s being watched by the king of the fae himself, and no one can save him if Oberon has marked him for sacrifice.