Life is full of ups and downs. It is like this for everypony and Scootaloo is no exception.
After one very bad "down", something particularly horrible, Scootaloo is in dire need of comfort and aid.
And just as she wishes for it, this comfort comes through Rainbow Dash, her big sister and idol. The pony she can always count on and who will always help her, even in her darkest hour.
To cheer her little sister up and give her new confidence, Rainbow Dash teaches Scootaloo one important lesson, the most important lesson a pony can learn:

No matter how dark it is around you, the sun always shines.

Initial idea (Rainbow Dash comforting Scootaloo) and the title came from Vanilla Mocha, whom I've taken this fic over from. Cover picture belongs to LinksLove.