The student and the teacher are in the hotel.

I am a high school teacher teaching mathematics. With a pleasing appearance, I am called a crush by quite a few female students. Among them is Shinonome Mirei, who impresses me because she always doesn't wear a bra when she meets me. One day after school, as I was packing my things to go home, Mirei stood in front of me. She said she wanted to have sex with me, which shocked me immensely because she was only 17 years old and so bold. I was going to refuse, but when Mirei took off her shirt to reveal her round breasts, I started to reconsider. And then...