This was an idea I had in my head for the longest time. Read the story before this as it kinda spoils the whole tale but I always liked to imagine Discord using the most extravagant and over the top ways to write to Fluttershy. He seems the type to want to impress, and the idea of Fluttershy sending cozy, laced letters in fine writing and getting these magical lands within paper from Discord just seemed to exotic and strangely heartwarming not to make a short story about it.
This is probably a oneshot, unless people really want more letters.