Night Fae by Silvana Falcon

Zevran vel Nacht was trained to be the Night Court’s deadliest assassin. But after they tore his first mate from him, he swore never to serve them again.
Then they capture Malik.
Zev should leave the human to his fate. Fragile. Mortal. Far too easy for the Court to break. But Malik is also an ally—and Zev has never abandoned an ally. To keep him alive, Zev must kill whomever his family commands.
Malik never wanted to be anyone’s weakness, least of all Zev’s. He refuses to watch him be dragged back into the life he fought to escape. He knows Zev is more than a cold-blooded killer. He sees his loyalty, his defiance, his heart still struggling to be free.
Yet every choice Zev makes to protect Malik pulls him deeper into the Court’s games, closer to becoming the monster they trained him to be. Zev warns him to be afraid, to run while he still can.
But Malik isn’t afraid. If Zev can’t believe in himself, Malik will believe for him.