From the TV Tropes: Axis Powers Hetalis recommendations page (http://tvtropes.org/pmwiki/pmwiki.php/FanficRecs/AxisPowersHetalia) (the usual warnings about visiting TV tropes and Recommendations pages apply to that link):
Title: Copenhagen (Extended) Author: Surelyyoujest Synopsis: Opera, quantum mechanics and politics, all filtered through the mind of a severely irritated Dane - or as summed up by the author: "1941. Germany and some of his friends turn up on Denmark's lawn one day and Denmark is Not Amused."
Linkies!
Title: Copenhagen (Extended)
Author: Surelyyoujest
Synopsis: Opera, quantum mechanics and politics, all filtered through the mind of a severely irritated Dane - or as summed up by the author:
"1941. Germany and some of his friends turn up on Denmark's lawn one day and Denmark is Not Amused."
http://hetalia.livejournal.com/4337047.html