Yutaka came to visit his relative Saori's house. His uncle couldn't come home suddenly due to work, so Yutaka had to spend a few days under the same roof with his aunt, and he was flustered by her charms... That night, Saori was sleeping alone, and was unable to use her mature body, so she indulged in masturbation while imagining having sex with the young Yutaka... Yutaka happened to peek at her, and the next morning, taking advantage of the uncle's absence, he had sex with Saori. Yutaka's day off was a day where he enjoyed sex to his heart's content with his aunt, whom he hadn't seen in a long time.