A son has started living alone in a studio apartment in the city. To check on him, his parents travel from the countryside by train to Tokyo. Seeing the cluttered six-tatami room, the kind stepmother Rika smiles and says, "Let's tidy up a bit," and efficiently cleans the room. That night, the father suddenly has to return home, so the stepmother stays overnight at the son's apartment. As the stepmother sleeps peacefully on a futon laid out in the small room, the son's cock can't help but get erect at the sight of her curves...!
