It's been a week since his wife, a career woman, left on a long business trip. Daisuke, who was having trouble getting the housework done, was visited by his busty, sexy stepmother. Her heavy breasts that sway with every movement are irresistible. Wanting to squeeze her overly voluptuous breasts somehow, Daisuke sneaks up on his stepmother while she's taking a bath, but is caught just in time. However, instead of getting angry, his stepmother seduces him by showing him how to masturbate...