A serious study session turned into a naughty study session. But I was bad. Before the test, I always had a study session with the girls in my class in my room and always taught them. However, because of the short skirt and always covered it, it looked like a panchira. Seeing this, I couldn't concentrate on studying and got an erection. I quickly hid it, but thinking about it made me feel uncomfortable, then a lesson for girls who are curious about erections began.