A beautiful aunt with family

My aunt, as a man, ends up looking at my nephew in the boarding house. Rena is getting frustrated because of her husband who is on a business trip, but one day, a demon tempts her nephew Jun. However, while he was still in school, Jun promised to devote himself to his studies without being part-time or romance-free, and stubbornly follows this and refuses. Although attracted to Jun's attitude, Rena is left feeling numb, and takes bold action...