Mei, who works as a welfare worker with her husband, mainly visits the homes of elderly people who live alone. One day, while visiting the elderly Satomura at his house, she finds him injured and unable to move on the veranda, and Mei ends up taking care of him. One day, while she is wiping the stairs, Satomura suddenly hugs her. When he buries his face in her crotch, Mei resists, but she feels pleasure from the caresses of his lewd tongue. Satomura, noticing her, becomes even more bold and asks for cunnilingus in front of her husband...