Aya married a man with an already-adult son, Yuya, and the three initially enjoyed a happy life together. Secretly, however, her husband’s lack of passion left her lonely and sexually frustrated. When he departed on a long business assignment, she unexpectedly began living alone with Yuya. His constant touching and increasingly intimate behavior made her uneasy, so she tried to keep her distance—but Yuya only became bolder, determined to impregnate her with repeated creampies.