Though their marriage is harmonious, Meguri, a voluptuous, big-bottomed housewife, grows increasingly frustrated as her husband no longer desires her physically. While her big tits usually steal the spotlight, her long-overlooked "first ass" finally takes center stage. When her brother-in-law moves in as a temporary resident, Meguri's suppressed libido explodes. Already possessing a dominant, aggressive nature, she becomes obsessed with face-sitting on the men around her. As this beautiful, lustful wife indulges in overwhelming pleasure, her desires swell in proportion to her ample backside, pushing her to cross thrilling new boundaries.