In Love and War: A Sapphic Fantasy Romance (Fae Isles) by Lisette Marshall

A demon craving revenge. A fae looking to prove herself. When Naxi and Thysandra meet in the middle of a battlefield, neither expects a worthy opponent. But with dark pasts and desperate ambitions driving them, peace is not an option … so when Naxi is forced to flee, Thysandra gives chase, bringing them far from the clash of armies. Away from their allies, away from the war they were meant to fight, the true battle begins – one of wits and perilous bargains. Every step of their cat-and-mouse game reveals secrets neither intended to share, laying bare hidden scars and unspoken desires. The deeper they go, the more their bitter rivalry turns into something far more deadly: an undeniable, irresistible attraction. And soon demon and fae are no longer just fighting for their lives … but for their hearts. Read more