Austria and Spain are huge masochists. Prussia was shocked when he found out, though he doesn't mind, and Romano still doesn't know.

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Austria and Spain are huge masochists. Prussia was shocked when he found out, though he doesn't mind, and Romano still doesn't know.
Austria loves playing with Spain's hair.
Spain and Austria's marriage was, for the most part, very experimental. They were young and had no idea what being married was about, or being in love. They found out only a few years before their (rather forced) divorce what love was via each other.
Spain likes to throw pebbles at Austria's window in the middle of the night and serenade him.
When they were young, Spain carved into a tree "AFC + RE Forever" surrounded by a little heart. It's still there, and Austria was stunned speechless when Spain took him there. Spain claims "It's still true."
Austria and Spain's marriage was almost entirely political. For this reason it was a very open relationship; they had feelings for each other, but really weren't phased by the other being unfaithful.
Austria, Prussia, Spain, and France once had group sex. Austria was the middle man and never had been so pleased. They're now a thing, though Austria still calls them morons.
Spain once tried to seduce Austria by laying sexily on his piano.