Just continue

You don't even bother to ask for her name or her consent, just flip that skirt up and thrust your cock into her slit. You usually aren't so rude, but again you're in an especially horny mood today, and are just looking for a tight warm twat.

Which you get. Her pussy feels like pure bliss. You can feel her body trembling underneath your weight, but you grab her tits to stabilize yourself, firm C-cups that you squeeze and knead beneath your palms. You brush a hand over her nipples through the pinafore, eliciting a string of loud moans.

Your hips are rubbing against her engorged clit, stimulating her to new heights of pleasure as she moans and groans into your palm. You feel her saliva coating your hand as you gag her. The disciplinarian in you dislikes a noisy class.

You continue to plunder the noisy little minx, as she trembles faster and faster in your gasp. You feel the first orgasm right as the five minutes end, a torrent of her sticky juices gushing out to coat your crotch.

Regretfully, you push yourself off her, and walk out of the locker room into the sports hall, leaving the still trembling nineteen year old behind.