Copper Cold Steel by Sori Aryl

SPFBO10

After the facial-scarred Lucia's father died, she became Marquess Lucian to inherit the Borderland of Winterstride along with his debt. When her step-sisters are chosen for the Princess Tests, she becomes a guard for another Lady to make ends meet. The Duke of Coppersteel looks at her a little too closely with his prejudice of Borderlanders after he scarred Lucian's face during a duel. Can she keep her identity a secret while helping her sister's win the hearts of the Golden Princes? Also under Kindle Vella under the same name. 96k words CW: Sexual assault, sacrifice, harassment