Perhaps "a few" is a bit of an overstatement, but I've come across at least a couple with that general premise. Maybe it was on ff.net or one of the few times I browsed the kink meme or something--unfortunately I can't remember exactly.

Liech, Italy, Austria, and Hungary all together in the same house?

Oh, man. For some reason that makes me crave some Italy/Liechtenstein fics. XD Switzerland would not approve.

And by all means, I hope you enjoy the rest of the arc, if/when you get around to checking it out. It's getting fleshed out, slowly but surely. ^^'