As children, the brothers lost their mother and never knew her warmth. Then they discovered a service called "Busty Delivery Mama." When they made a reservation, a kind, nurturing woman named Mama Yukari would arrive—voluptuous, big-breasted, and radiating comfort. With her lush body, she embraced the brothers, passionately rocking them to heal both their hearts and bodies. For these longing brothers, the maternal presence of Mama Yukari became an irreplaceable part of their lives.