Shadebound: A Dark Academia, Enemies To Lovers, Slow Burn Romance, Fantasy Academy Series (Dark Fantasy) by Tierney Storer

Every killer needs a muse, and she happens to be his. Jinx Draconis was sentenced to Mors Academy for a string of violent crimes she doesn’t regret. Her only mistake? Not killing the right person. Oh, and accidentally getting her magicless younger brother locked up with her. Now she’s trapped in a brutal cliffside military prison disguised as a school. Where magic is weaponized, students are wicked. And each of them is being forged into a killer to fight the plague of monsters destroying their home world. Jinx doesn’t want redemption. She doesn’t even care about surviving her sentence. All she wants is revenge, and to protect the only sibling she has left. And when students start turning up dead—murdered just like her twin sister—Jinx suspects the killer she meant to destroy might be trapped inside with her. As if she didn’t have enough on her plate, some of the men haunting the halls come with baggage she swore she doesn't feel: like her childhood sweetheart who told her he loved her, then disappeared without a word, or the enemy born of a centuries-old blood feud who would rather bleed than smile, and the masked man who watches her from the shadows and leaves her wanting more. Read more