Kana Miyashita, a newlywed, enjoyed a harmonious relationship with her stepson and lived a happy family life. Young and beautiful, she was a source of pride for her stepson and a calm, gentle presence at home. However, she harbored a secret side—Kana was deeply addicted to large penises, her obsession overpowering her rationality and driving her to act on impulse without regard for consequences. When she accidentally discovered that her stepson was well-endowed, her hidden deviant nature was exposed. Overwhelmed by an intense desire for his huge cock, she began setting her sights on him.