"Mom, I can't hold back anymore," those words marked the beginning of Rin's affair with her stepson Yuya. It was supposed to be just once, but Yuya, caught in the throes of adolescence, became addicted to the pleasure of sex and began craving Rin every single day. Fearing the collapse of her family, Rin tries desperately to resist, but her efforts are in vain. The moment her husband leaves the house, Yuya's body instinctively becomes aroused, and Rin's own body gradually succumbs to the overwhelming pleasure. This forbidden relationship goes far beyond mere lust, leaving deep emotional scars on both of their souls.