We spent one summer (pre-internet and pre-driver’s licenses) mailing letters to each other from our own kingdoms, stealing all the good bits from Tortall and making ourselves queens.
This sounds magical. I would absolutely watch the whimsical Taika Waitit movie mingling your adventures as queens with your everyday lives and letters.

It's fascinating how almost everyone (or absolutely everyone?) I know who writes fic was always writing fic. The internet just formalized how we do it.