When I returned to my wife's parents' house, my sister-in-law and her husband also returned home. In this short period of time, I had a secret that I couldn't tell my wife ... We love each other so much that we have sex every day, but my sister-in-law couple has only once a week. My sister-in-law's desires, which are frustrated, are struck by my relatives. The complicated incest that was taken down by my sister-in-law and my brother was immoral, but I felt the pleasure and excitement that I had never seen before.