The gym locker rooms.

Making her way through the hallways that littered the school, Karen decided to begin her exhibitionism adventure by picking the most convenient spot; the locker rooms at the gym! Not only did she have gym class later on, but there were also shower rooms, meaning she could change in the privacy of a lone stall before she began!

Heading down the main staircase that connected each floor of the building, she arrived at the ground floor, before making her way to the gymnasium, careful to ensure she wouldn't meet anybody else along the way.

And entering the gym, she rushed across the floor, making her way into the female locker room, as she looked for a locker she could use.