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I am a teacher. After school, when the students went home, they went to the classroom to pick up something they had left behind, and found Yui, the class representative, fidgeting with something at the boy's desk. When I looked at her, she was rubbing her crotch against the corner of the desk with a sublime expression on her face. Yui is supposed to be a quiet and shy student who wears glasses... After being surprised, Yui bumps into the door and decides to talk to Yui. I confessed that I was worried that my sexual desire could not be subsided...