Mai, a married woman, invites her friend's mother and son to her house. But that was the beginning of a life of carnal desire! Mai didn't realize that her friend's son Yuta was staring at her big breasts... Every day, Yuta pampers Mai and fondles her breasts. And when Mai sees Yuta's erect penis, her reason collapses! She accepts the night-time visit, shakes her big breasts, and indulges in sex! And the two of them sneak away from the family's eyes...