My Knight Chose My Sister

Betrayed by her knight, who chooses her sister, Sera escapes her cruel family by agreeing to wed Cassius, a crown prince feared as a monster. As his devotion heals her wounds and her magic calms his torment, they fall in love. But when her former knight learns she was his true savior, his regret turns to obsession, forcing Sera to fight for her chosen love and freedom.