Because I had to interview in Tokyo, my brother let me stay at his house for three days. While looking for the toilet, I accidentally saw my sister-in-law's beautiful buttocks. That image kept appearing in my mind. The next day after the interview, my sister-in-law was kneeling down to clean the house, making those beautiful buttocks seem to burn in my mind. When I saw her sleeping on the couch, my endurance exceeded the limit, I rushed towards her, took her body, and ejaculated inside her... And our secret relationship lasted for three days... until I moved to Tokyo, near his house to start working...