I could totally see this with Belarus. Like: this is what brother did. I'm getting closer to him. (Whether such things actually happened is questionable.)

Also because seme!Belarus is possibly the hottest thing ever. Esp. with uke!America...

I might fill this. Maybe.

Come to think of it, I can picture is with Hungary, too. Does OP have a preference? (Although I can't guarantee I'll do it.)