The Nightmare that helped Princess Luna to become Nightmare Moon didn't just appear from nowhere. This is the story of where it came from and just how it entered Luna's mind.
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One hour speed writing story for a music prompt contest in the Quills and Sofas group.
Prompt was this: https://www.youtube.com/watch?v=ewvWoDGKm0U
Unedited.
Coverart by Omni87 with permission. Look them up on deviantart.com, it's worth it!

Twilight and her friends have tried to befriend the returned Princess of the Night for years now. Still the Dark Princess seems to prefer a secluded life, barely speaks to other ponies or takes part in social life.
Twilight is growing desperate. Why can't she, the Princess of Friendship, make the royal sibling a happy part of the society?
So she does, what she had always done in the past. She asks her mentor...

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AU for safety reasons.
Picture was free on unsplash.com

This is my first time posting anything I wrote. Comments are welcome, just, please, be kind.