Russia somehow finds himself in the universe, where he is America's slave. He is obviously not happy with this, while AU!America's even more unhappy with his long time loyal slave starts to show too mach character. Cue some torture, rape and power struggling.
Bonus: Russia is very much attracted to Prime!America (and that's mutual, sorta), but they're not in relationship, due to, uh, their complicated political background.
Bonus 2: When AU!America demands sex/actually rapes Russia, Russia tries to imagine that he is Prime!America, to make sex more tolerable. It doesn't work, and makes it even worse.
Alternative Universe!America/Russia - Slave AU
Bonus: Russia is very much attracted to Prime!America (and that's mutual, sorta), but they're not in relationship, due to, uh, their complicated political background.
Bonus 2: When AU!America demands sex/actually rapes Russia, Russia tries to imagine that he is Prime!America, to make sex more tolerable. It doesn't work, and makes it even worse.
Silly 3'd bonus: AU!America has long hair.