Nation A and Nation B are in a pre-established relationship. Nation B is the one usually penetrated in their sex life (via the usual method or a strap-on, depending if it is a hetero, slash or femslash couple) and is also the one with a higher sex drive. But one night Nation B is very tired, and Nation A wonders if they shouldn't have sex because of this. However Nation B insists, despite being tired. So they start to have sex and everything goes fine... Until Nation B falls asleep in the middle of it.

Cue Nation A being unsure how to react. (They don't want to just keep going, but should they wake B up of just stop and let them sleep...)

Bonus: Nation A stops and wakes up Nation B who is like "why did you stop" and Nation A is like "because you fell asleep!" and B is like "what, I did?"