Rin took a long holiday to visit her parents' home with her husband, planning to spend time with her sister and brother-in-law. However, her husband had to leave early due to sudden work, leaving Rin alone at her parents' house. She got along well with her sister and was enjoying a relaxed stay, but her brother-in-law Jo kept his eyes fixed on her. He couldn't help but be drawn to Rin's big tits and her soft, voluptuous figure. One night, Rin returned from the bathroom without a bra. Seeing her like that, Jo was overwhelmed by desire and pinned her down.