The son-in-law, who lives with his wife's parents, is immediately attracted to the big breasts of his mother-in-law 'Aoi'. She didn't know about it and was kind to her son-in-law, but one day she was violently sought by her son-in-law who couldn't stand her obscene big tits, and eventually developed into sex. Aoi, who should have refused her, is lustful, and while her husband is drunk, she wears her erotic underwear and seduces her son-in-law.
