I Was Reincarnated and Entrapped By the Duke that I Stan!

Nadia, a young noblewoman who had been reincarnated, daydreams about Rainald, a nobleman who just looks like her favorite character from her previous life. In this life, she continues to create fanwork, this time about Rainald. Despite the fact that she draws him in certain situations, she has no experience with men at all... yet he comes to her and begins to hold her. She ran into him in town! He finds her powers of observation and art skills that were both honed for her fan activities interesting, so he orders her to help him secretly gather intelligence. Then he proposes! She never expected that the hot nights where her fave would kiss her and announce that he'd make her feel good would ever come! Nadia feels like she's going to go crazy with true pleasure and passion that she'd never known just from creating fictional stories... Source: Renta!