Twilight is quite the supporter of reliability and efficiency. As such, she has developed a spell to help her maintain her wings, but her marefriend Luna doesn't think efficient is the best option when it comes to preening. And she's decided to argue her case.

** I recently completed a significant rewrite and the story is now a little under twice its original length. It's still basically the same story, but hopefully a bit improved.

This is set in the future of the All for One - One for Luna timeline.