Reiko had a beloved son who was forced to be hospitalized for a long period due to a traffic accident. Finally discharged, her son was confined to a wheelchair, able to move only his left hand, and seeing him like this broke Reiko's heart. She devoted herself completely to caring for him, but her maternal love grew excessive—pitying the way his cock swelled up helplessly, she began using her slender, pale fingers to relieve his pent-up desires in place of his immobile right hand. This first step led them deeper each day, forging a new, intimate bond between them.