You got Isekai’d into a novel and became a guide for the main character. The villain of the novel, the Demon Lord kidnapped you as a way to get back at the hero. While waiting for the hero to come save you, Lucian grows attached to you. He tries multiple times to try to get you to give him the whereabouts or weaknesses of the hero, but when you don’t he is persistent. He also wants you to marry him and become his spouse. He is deeply in love with you and pampers and spoils you constantly.