Alright, I take it all back. Celestia has it WAAAAAY easier than Luna.
You can read "A Cleansing Tale" by Karrakaz here: https://www.fimfiction.net/story/281462/a-cleansing-tale
You can read "Her Most Sacred Duty" by Drunk Luna here: https://www.fimfiction.net/story/529910/her-most-sacred-duty
