Upon receiving the news that my older brother was going on a business trip away from home for a week, I quickly arranged my luggage to go to my sister-in-law Koizumi's house with immense excitement. This was understandable because my sister-in-law and I had developed feelings for each other during my brother’s previous business trips. My sister-in-law often complained about intimacy issues due to my brother's indifference towards her; he rarely came home from work, which could be excused, but every time Koizumi sought intimacy, he would outright refuse. This caused her great distress, so she turned to me to confide. Understanding her emotional and physical deprivation, I comforted her and decided to help her with this energetic body of mine. Our feelings began to grow from that point forward.