Due to my work, I decided to stay at my brother's house for about a week. My brother's wife, Yuka, is very beautiful and kind. I haven't had much acquaintance with my sister-in-law since my brother's wedding. Such a sister-in-law had a strange habit. In an empty house, I'm always naked ... Yes, I was a naked tribe. I never thought that I and my sister-in-law would be like that when I knew it.