England is doesn't want to be the one who blushes all the time. France claims that he never blushes and England sets out on a quest to make France blush. I think it would be easier if they were already in an established relationship, but it's up to you.

Bonus 1: England succeeds unintentionally
Bonus 2: France blushes while everyone is watching (during a world meeting maybe?)
Bonus 3: America and Canada bet money