In the middle of the night, feeling extremely aroused, I crept into my sister-in-law's room to seek intimacy all night long. As soon as I learned that my brothers were on a business trip for a week, I quickly packed my bags and drove to my sister Koizumi's house with great excitement. It is known that my sister and I are in love because my brother is often away on business. His sister continuously complained about her husband ignoring her in bed. He rarely comes home from work, but whenever Koizumi asks, he always refuses. This makes him very uncomfortable and he came to explain to me. Understanding my sister's emotional and physical needs, I comforted her and decided to help her have a strong body. Our love for each other grew from there.