As her husband gets busier at work and their sex life becomes less frequent, Aika, the son's wife, notices her father-in-law's lewd gaze and enjoys it. One night when her husband is away on a business trip, she finally makes a move. She changes into casual clothes that accentuate her voluptuous bust and the curves of her round ass, and seduces her father-in-law. Unable to resist Aika's lascivious sex appeal, the father-in-law embraces his son's wife passionately and passionately. He becomes captivated by Aika's body and desires her again and again, which leads to a change in his son's wife's body...