Waltzing at the Congress

One evening during the Congress of Vienna (1814-1815), Austria challenges Prussia to dance with him. Or: The fanfic in which Austria swears more than Prussia. Sort of a prequel to 'Ambiguity tolerance, 1938', but may be read separately. Inspired by several fanfics in which Austria dances with Prussia, but somehow never does what I'd have been tempted to do in Austria's stead …