There are two sins a country can make... Everyone knows them, and everyone has to abide them... No exceptions.
The first Sin states: "A country must not fall in love with another country." This sin clearly tells of the misery and depression that Countries forever shall go into if broken.
The second Sin states: "A country will not and shall not fall in love with their King or Queen." This sin is much more strict and has many boundaries.
But, to tie it all together in one sin, a country is forbidden to fall in love. Even Hungary, who shows quite a bit of affection towards Austria knows better and never goes outside the boundary lines. All countries know and obey these laws put in place by the Continents of the World. There are no exceptions and no loops holes out of these sins... And if they're broken, consequences will happen.
Prussia knows all this. When he was born and all through his life he remembered Europe telling him these sins. So... Why did he find himself breaking not one but both sins? The guilt claws at him, but he'll never admit to loving not only his king, but a fellow nation as well.
He'll always walk with his head held high and a smile on his face, but if you look, his eyes will tell you another story thats hidden behind lies. v_v