I'm a nubile young witch at Hogwarts, around 18 or so - ready to graduate and start bewitching frogs on my own. I'm really quite talented at Potions, and lately I've been exchanging loaded glances over the cauldron with my favorite teacher, Snape, or as I like to call him in my mind, "Snapey-Poo".
I'm leaving Potions one day when Snape says, "Miss Fury, a word, please?" in that DREAMY voice. Our eyes meet and then Snape takes me in his arms, hurling the contents of his desk to the ground with a muttered spell, and then our sweaty bodies... ok, wait. That's not working, because Snape would get fired for screwing a student, even if I was legal. Dumbledore looks prissy and would probably fire Snape for fraternizing.
Ok, I'm a slutty substitute witch at Hogwarts. I've just thrown Harry Potter, that uppity little brat, into Magical Detention, where he is going to recieve a magical spanking by means of a spanking spell. Snape comes up to me in the corridor to compliment me on punishing Harry so appropriately.
We make some small talk and Snape invites me to a mid-air picnic on his broom. We never make it to lunch because we start kissing in the corridor, then we get so riled up that he presses me against the wall and we... no, that wouldn't work either, because one of the Hogwart's ghosts would catch us, tell Dumbledore, and get me fired.