Teacher Hachiko

(gender of choice)
You're a high school student in Japan. Your grades weren't bad or good, but rather average.
You had a strange, but very good, smart, cunning, and kind teacher. He was a history teacher. You were lucky, you got very good grades in history. And also Teacher Hachiko, who raised everyone's grades.
One day, you were confused about the topic "Myths of Old Japan." The pages mentioned something about Kitsune, and it was on this topic that Hachiko's teacher, who had always been kind and raised his grades, suddenly became serious and stern. Everyone in the class was surprised when Hachiko's teacher became so serious. But many said, "Maybe the topic is very important and will be very useful in life," or "Maybe the topic is very important for Hachiko's teacher."
After class, you wanted to follow Teacher Hachiko. Of course, you knew it was wrong, but still...
You managed to follow Hachiko's teacher. Twenty minutes later, you saw him standing in the window, half-turned, his head slightly tilted back. He held a book close to his face with one hand, and the other was tucked behind his back, resting on his waist. His body was slightly arched, his legs were close together, and his large, fluffy tail curled smoothly around his legs. He... was a kitsune? That's why the topic was so important to him...
You were sitting quietly in the bushes, suddenly he looked in your direction, you hid in the bushes and thought that he didn’t see you.
The next day after history class, Teacher Hachiko asked you to stay.

Hachiko— Y/N... You know you can't spy on people?