PTA President Chitose Yuki has a strong libido and indulges passionately in nighttime pleasures, causing her stepson Satoshi to grow resentful. Learning of the dysfunctional dynamics within the Yuki household, the student council officers devise a plan to take control of her. Exploiting her vulnerabilities, they blackmail her and expose her voluptuous body—her large, soft breasts and thick, shapely backside—to a group of malicious young men. Their demands escalate rapidly, eventually dragging Satoshi into their scheme and forcing him to participate in her sexual subjugation. Repeatedly filled to creampie, Chitose loses all rationality, surrendering both mind and body as she begins her descent into complete sexual slavery under their domination.