Sakura Kirishima married a man much older than her and has one son. Her stepson Futoshi can't help but be curious about Sakura, who does the housework every day in a defenseless state. Futoshi's eyes are glued to Sakura's nipples, which are visible because she's not wearing a bra, and her ample cleavage, which is visible through her clothes. Unable to hold back any longer, Futoshi gives in to his desires and has sex with Sakura, and together Sakura become immersed in a forbidden relationship...