The Rainboom happens as it should, and a few certain fillies earn their cutie marks because of it. Except little Pinkamena Diane Pie, who went inside before she could witness it. Thus, she never left the rock farm.

That meant she wasn't in Ponyville to throw that party that inspired a runaway colt named Cheese Sandwich.

However, the two end up meeting in adulthood, and the broke wanderer Cheese takes a job at the rock farm, and works alongside the grumpy Pinkamena and her family.

My take on an AU, created upon realizing that Cheese Sandwich was indirectly affected by the Sonic Rainboom. And in case you're wondering, the whole eternal night thing goes the same way as the show (except a different mare--whoever you imagine--wields the Element of Laughter).

100% approved and has been featured by Twilight's Library! (6/2/14--6/9/14)
Also, here's a TV Tropes page.

Cover art by me.

This story is a sequel to Past Sins

Hearth's Warming is a time for friends and family to come together, celebrate harmony, and welcome the new year. Nyx is looking forward to just this as she rides the train to Canterlot with Spike and Twilight. She's going to meet her extended family for the first time and wants nothing more than to make a good impression. Yet, the sheen of the holidays can't hide the trouble caused by meddling grandparents, relentless reporters, and a paranoid uncle.

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?