"Big brother," I heard a familiar voice. The voice belonged to Natsumi, a childhood friend who lived nearby. Natsumi, who was three years younger than me, was a friendly girl who was always smiling beside me. It wasn't that I was conceited, but she liked me. When I met her again on my first visit home in five years, she was much more mature and sexy than the Natsumi I remembered. It was the first time I thought of Natsumi as a member of the opposite sex. But Natsumi already had a boyfriend. So I...