Long ago, her son no longer needed breast milk, yet he continued to seek out his mother Riko's breasts. Unable to suppress her lust at his fierce sucking, Riko would release her pent-up feelings through sex with her husband. Just then, her husband was assigned a solo business trip, and Riko lost her outlet for sexual frustration. Her son still sought her breasts every day. Even living alone together, this continued daily. The growing resentment could not be dispelled even by masturbation, and she began to indulge in lewd fantasies about her son…
