Naughty Nurses. Nao Nakao.

Housewife Nanao lives while taking care of her husband and father-in-law. Lately, her father-in-law's dementia has worsened, to the point where he mistakes her for his deceased wife... But the kind Nanao goes so far as to play the role of his late wife, devotedly caring for him. However, Nanao's kindness backfires, and one day her father-in-law persistently seeks her body! Understanding her father-in-law's feelings, and also driven by her own sexual frustration, Nanao ends up having a relationship with him... The acts between Nanao, neglected by her husband, and her father-in-law escalate, and the two passionately grope each other's bodies, becoming deeply absorbed in intense sex as if they were husband and wife...