Staying at a guesthouse together, the son becomes intensely aroused by his mother's pale, round buttocks when he sees her in the bathroom. Unable to suppress his desire, he sneaks into his mother's futon and presses his body against hers, embracing her tightly. Overwhelmed by her warmth, he grows increasingly attached to her body, eventually having his anus stimulated, triggering a strong urge to defecate. The shocking climax occurs when he ends up filling the futon with a huge pile of poop.