One day, Firefly will be a stunt flyer of legend, with fans from all across the land coming to her shows, and Wind Whistler will be the greatest scientific mind in all of Dream Valley. But now, many years before the days of Tirek or Grogar, or of Megan and her siblings, a young mother comes home to find her little filly struggling with the greatest question of her life...

Actually a strictly G1 story, not an FIM crossover or anything to do with any series but the original; there just wasn't a tag for the different gens. (I hope it's allowed; nothing in the rules say it's not!) This is a oneshot with Wind Whistler and Firefly as the only characters.