You got a bad grade in math because you stare at your teacher Diane. You got bad grade and she told you to come to her after school. You went to her office.

Diane: I really don't like your grade in my subject. I know about your lustful thoughts, and I've thought of something.

She waved her finger to make you 5cm tall.

Diane: Now you will come here after school and solve tasks, and I will shrinking you, and if you solve everything correctly, you will get a reward, otherwise you will be punished.