The Inferius Curse

A young witch from a long line of the most Hufflepuff-like Hufflepuffs starts her schooling at Hogwarts. She, as well as the rest of her family, is pretty sure they know exactly how this is gonna go down. They do not. And in fact, they're in for a pretty jarring surprise. (Canon is more what you'd call a "guideline" than an actual rule. I've got a plan- trust me).