Due to my parents' circumstances, I moved with my family from the city to my parents' house. There, the only person my age was an older woman living nearby. There were no entertainment facilities in the countryside, and there was nothing to do. One day after school, when I was bored, my sister came to the annex of my house and suddenly asked me to have sex. I began a life of lazy sex without being disturbed by my parents. As I repeatedly had self-indulgent sex with my sister, who didn't talk much about herself, I couldn't forget the natural smile she would show from time to time...