This story is a sequel to Detente
Discord takes Fluttershy to see something chaotic he's made that he thinks will be considered harmless and beautiful -- rain made out of light. Fluttershy agrees, but fears that ponies won't accept it anyway. They discuss friendship, and Fluttershy comes to some unwanted conclusions regarding her own feelings. One-sided, mild Fluttercord.
This story is the bridge between Princess Twilight Sparkle Endcaps and Elements of Opposition. To those who have not read the story before, and who like happy endings: don't read the second chapter. It leads directly into Elements of Opposition, and is the main reason the story has a "Sad" tag.
Edited to add cover art. Woo-hoo! The artwork for the cover comes from the wonderful C-Puff, goddess of adorable Fluttershy & Discord friendshipping. :-)