My wife went on a trip alone. As the relationship between the couple cools down, he can no longer resist the temptations of his wife's older sister, Miu... She can't believe she's being seduced by her sister-in-law, who is so perfect and beautiful... The more she thinks she's no good, the more her rationality is blown away... Day, night, and morning, while her wife was away, she had intense sex with Miu, causing her to cum over and over again.