My sister-in-law has returned to the house where she lives with my wife and father-in-law. My wife is astonished, and my father-in-law is worried and angry. I don't understand the reason for their behavior... until I learn the true nature of this beautiful woman. My sister-in-law shows off her lewd body without hesitation and approaches me innocently. I feel confused by this sudden turn of events, but it doesn't take long for me to betray my wife... I find myself becoming more and more addicted to my sister-in-law's charms.