A Japanese family lives in a one-room apartment and the son often finds his hot step-mom on all fours cleaning the room when he comes home. Her panties are peeking out from under her skirt, which makes the boy's dick start beating in his jeans. Mommy notices this, gets embarrassed, and runs out of the room, realizing that her son's boner makes her panties wet. And so, as night falls, the father of the family falls soundly asleep on the floor, and mother and son settle down on the bed, where the sexual lesson begins. The lad gets attached to his mother's tempting buns with his cock and starts rubbing against them. She wakes up, sits on top of him, lets him paw her tits and fondle her pussy not only with his fingers but also with his stiff pecker.