He’s My Real Brother, Duke Novel

Astel, the secretly held younger sister of the fantasy novel's protagonist, Astel, finds her life far from a fairytale. While her brother Cassian is driven by familial vengeance, Astel's own path is fraught with greater danger: uncovering the novel's ultimate, unrevealed antagonist. Her mission necessitates infiltrating the Northern Duke Castle, a den of familial betrayal. A turn of events, orchestrated by fate or the author, binds Astel through a "companion imprint" to Duke Anais. He is a formidable figure and a likely suspect for the villain she hunts. However, this bond imposes an unexpected and unsettling condition: daily physical intimacy. This requirement, absent from the original narrative, disrupts Astel's meticulous strategies. The Duke's possessive tendencies, amplified by this connection, rapidly escalate.