My only hetero pairing in Hetalia. I don't know if Elizaveta identifies as a boy though but I don't mind if she does. But I'm not sure if Eliz does identify currently but she seems to identify as a girl with what Roderich has done.
Hetalia ~~~ Japanese New Years Tradition enacted by Pochi, America, China, England and Japan. ::: From PASH Magazine in not entirely sure what's going on, but America looks a little too hammer-happy to me XD Who gave him that and told him he could smash?