Staying at his aunt Ayumi's house due to his busy work schedule, nephew Yuiichi finds himself increasingly drawn to her. Ayumi, deeply attracted to him, constantly tempts him by pressing her voluptuous, soft body close. Yuiichi struggles to maintain self-control—until one day, when Ayumi suddenly touches his crotch and asks, "Is this area nice and clear?" Overwhelmed by the sensation, he climaxes helplessly. Later, as Yuiichi opens up about his work troubles, Ayumi comforts him by inviting him into the bathroom, drawing them even closer and deepening their forbidden bond.