Sōta sees his wife off at the train station for her trip. Back at home, he's struggling with housework after being alone for a while, when his wife's sister, Yurika, comes to help out. While enjoying her home-cooked meal, he can't help but be distracted by her ample breasts, making it hard to focus on eating. He manages to get through dinner and rushes to the bathroom for a break, but Yurika follows him in right after. Now face-to-face with her bare breasts, which he's been trying to resist looking at, Sōta's cock swells to the point of bursting...
