For the past six months, I've been receiving private tutoring once a week to prepare for my entrance exams. My tutor is a female college student who goes by Natsuki Rin, a kind and warm-hearted woman. She doesn't just guide me in my studies—on days when my parents aren't home, she watches over me like an older sister, becoming someone I deeply trust. One day, I accidentally told my mother about a girl I liked at school and felt deeply embarrassed. After that, I noticed a subtle change in Natsuki Rin's behavior. When we were alone in my room, she started the lesson as usual, but after a while, she whispered, "Want me to teach you something besides studying?"