Reiko who is recently frustrated with sexless with her husband. Every time I see Takashi, my son-in-law, I have a burning sexual desire. Appearing in front of Takashi who is studying, urging lust with handjobs and lewd words attack, close contact foam attack in the bathroom, and sneak into the bedroom and carry out reverse night! Attracted by Reiko's obscene magic, Takashi finally opens the forbidden door...