The Prince Is A Girl: The Slave In A Princess Disguise

Emeriel hides her true identity by posing as a male servant in order to shield her younger sister. The source premise is clipped, so the story is set up through a single protective act: a young woman who must keep her gender concealed while living under a disguise that could cost her everything. Her determination to safeguard the one person she loves drives the conflict in a western fantasy world where status and servitude shape every choice.