Completely subjective sexual activity with my sister-in-law

My name is Ryoichi. 22 years old, a fourth year university student. One day, I suddenly ended up living together with my sister-in-law, Arare-san, for 10 days alone. But in fact, I feel a bittersweet about my sister-in-law... When I was a student, when I was in a senior and junior high school in the track and field club at the same school, I fell in love with my sister-in-law, so I confessed to him and was rejected beautifully. That happened, but... I'm definitely not able to hold back from living with a woman I fell in love with at least once!