"You do?" Cheerilee's face fills with giddy delight, "Well that's great, you can help keep an eye on the kids during free reading time for me while I grade their tests! After all, that's all there is left for the school day."
She takes your hoof and leads you into the schoolhouse, where several of the younger ponies have already spread out their mats and taken out their books to start their quiet reading time. It doesn't seem like it's going to be too hard of a task, just have to watch them while Cheerilee does her work and then you get to spend some time afterschool with teacher. Sounds delightful.
So you sit, waiting. They're probably going to read for an hour or so, so you'll have to keep yourself busy. At first you try watching the kids while they're reading, but a reading foal is one of the dullest things you've ever seen in your life. You skim some of their books, like "The Three Little Diamond Dogs" and "The Cockatrice's Woods", but you read these things back in elementary school, so it's a moot point. Eventually you just settle back into your chair, eating some graham crackers you swipped from a chubby colt's lunchbox and watching the clock.
"Sigh." This is gonna be a looooong hour...
Psst
Your eyes snap open and you turn towards the noise; it's Cheeriliee, staring right and you and chewing on the end of her pencil. She raises one hoof, plants a kiss on it, then blows it to you. You blush and turn towards the foals.
They're still reading, none the wiser.
Your eyes lead back to Cheerilee, still giving you the bedroom eyes from across the room. She licks her pencil, then her hoof, and slowly brings it down under her desk. She bites her lower lip, sweating. She's... She's clopping! Mother of Celestia! Your eyes nervously dart to the kids and back to Cheerilee, but they still have no idea and you can't pull your eyes away from her even if you try.
She starts making little coos, testing the luck that's gotten her this far, moaning almost to mock you and the whole class of naive little ponies. She strokes her sex as slowly as she can, making sure you feel every little slick touch. You feel yourself start to moisten, and very quickly cover your bits with a copy of "The Three Little Diamond Dogs." Against every bit of shame you have, you start to rub the soft leather cover of the book against your cooter.
You feel like Cheerilee's about to blow, her face red and contorted. You won't last much longer, but before either of you can taste the bliss of orgasm, something pulls your attention away from her. It's...