Girls in high school these days have great physical development! The smarter and more serious the girl, the better her sexual knowledge. They prioritize studying, so they can't date and their daily pent-up sexual desire builds up. To release all that built-up sexual desire, who would have thought it would be at a cram school? Instead of studying, they end up handling sex. It must have been really built up, huh? Fear the exam takers! They twist and turn nipples and clitorises instead of pens.
