Yuu Asagiri plays a big-breasted married woman striving to maintain her dignity as a devoted mother and wife. However, her life takes a turn when her teenage son, with whom she lives alone, begins groping her large breasts daily. What starts as seemingly innocent affection soon reveals clear sexual undertones. Though shocked and conflicted, she gently tries to discourage him, but her son pays no heed—her ample breasts becoming an everyday object of his desire. As the act becomes routine, she struggles with how to respond, torn between maternal love and growing arousal, unable to sever the bond they share. This emotional turmoil and inner conflict are deeply explored throughout the story.