A floating bra female teacher unconsciously seduces me

With only one year left in the school, I finally got my dream teacher, Terabayashi-sensei. The most popular teacher on the school is kind and beautiful, and is my ideal teacher. However, recently my grades have declined for a certain reason. This is because the teacher's chest is so defenseless that he can't study at all. Even though it makes me excited just seeing my bra, I can even see my nipples... Then I ended up staying alone with my teacher, who was worried about my grades, and I ended up going to class...