The Replacement Letters

Dear Celestia

I managed to make Rarity into a butterfly-winged pony, does that count as extra credit? Why is time travel easy, but giving a non-pegasus wings, and changing somepony's age hard? That seems rather weird; just like those three stooges who bullied Rainbow Dash back in the day claiming that the sonic rainboom doesn't exist when they saw it with their own eyes when they were colts.

Twilight Sparkle