There was one on the kink meme that I've been following but it hasn't updated in over a year, so it's likely the author has abandoned it. Link: http://hetalia-kink.livejournal.com/21382.html?thread=87554182#t87554182

I like magical fics a lot even in other fandoms. And I would write the fic that would incorporate those magic-type headcanons but it's the type of fic that's going to be huge and epic and it would be long with a complex plot, and I don't have the confidence that I could write it well or finish such a fic. D:

Maybe he was cursed with it! Or every time he cooks, a mischievous demon makes things turn out bad. Or etc. Hmm, not sure. It hasn't been stated yet, so for now, maybe no. Parallel to Norway and Iceland, the little bro isn't necessarily magical like his older brother.