Because I had to go to Tokyo for an interview, my brother let me stay at his house for three days. While looking for a toilet, I accidentally saw my sister-in-law's beautiful butt. That image kept appearing in my mind. The next day when I came back from the interview, she was kneeling down to mop the floor, making that beautiful butt burn in my mind. When I saw her sleeping on the couch, my endurance exceeded its limit, I rushed to her, took her body and ejaculated inside her... And our secret relationship lasted for three days... until I moved to Tokyo, near my brother's house to start work...