PE

"And that is why we called for you" miss Edgewater explained as they entered the teachers locker room. It was small, a single old looking shower stall, an open toilet and just a bench for the clothes. Hardly luxury and much worse then the male students lockers! Being far to intimidated Arnold just nodded.
"I-I see, getting a student like me who wasn't that good at PE to teach it shows... even those who dislike it could do well?"
"Yes that's right dear" the headmistress said with a grin. "Now any minute the students will come down here to get changed so you get a quick shower in this staff locker and meet them in the hall to start the lesson" she explained as she gave him a pat on the shoulder for luck.

He looked back to the grimy, dimly light locker room... did he really want to change here? The mens locker room was state of the art when he had been their, much better kept and with a shower you could actual... well jerk off in. Miss Edgewater's teasing had quite the effect and he felt his little nub start to stand up. If he changed here there was no way he would get off in time.