The North American bros and the Goblet of Fire

Pottertalia (Harry Potter and Hetalia crossover)
England and Harry share the Voldemort dream and England sends Matthew (only Matthew-Alfred would draw too much attention. Well, only Matthew at the start) to Hogwarts to watch him, before taking a teaching position on his own. Unfortunately, Matthew is sorted into Hufflepuf, and Arthur's job is Muggle Studies. Good luck with life, guys.

No ships, except for canon. But think of it as you want

I adopted this book from @grizzlyeagleshark