Dragon Lord by Dana Marton

Until Einin was tossed into his dragon cave, Draknart never had a virgin sacrifice punch him in the face. Draknart is the scourge of the countryside, but when the villagers toss another maiden into his cave, he finds Einin fierce, unafraid, and armed for battle. Determined to slay the dragon, Einin doesn’t know that he is under a fairy queen’s curse, doomed to transform to man from midnight until dawn. When Draknart offers her a bargain to save her village, Einin has no choice but to make a deal with a dragon…