[Excerpt from that contest's rules thread:]
[Q:] I have a question. Are love triangles allowed?
...
[A:] I think that’s perfectly acceptable

Sequel: Left Behind: Sunny Disposition
Apparently it was scouted and is on EqD too

Nightmare Moon was meant to be released after a thousand years. A momentous occasion for her but terrifying for all the ponies on her day of freedom. She would get revenge on her sister and cover the world in darkness and shape everything to fit it.

That was the plan, at least. Instead, something went awry with the spell and she wasn't released when she was supposed to be. The mare-in-the-moon is brought into a world with stagnated technology, giant cities, and no sign of her sister or any of the other immortals. In fact, ponies don't seem terrified of her at all, and the stay within the core of her powers infused and changed the alicorn's body drastically.

The alicorn had no obstacles left! But...she was also a relic of the past. A past everyone seemed to have forgotten. A past she could no longer look upon.

Artwork by ElkaArt. Link in source.
Big thanks to Kryostase for helping spot errors I've missed.

After being framed for something she didn't do, Sunset Shimmer is is bullied, shunned, and alone. She meets three people who will almost certainly be bullied, shunned, and isolated because of something they didn't do.

Their names are Adagio Dazzle, Aria Blaze, and Sonata Dusk. They are human teenagers who don't know magic is real, this is their first time in Canterlot, and they're transferring to CHS. They have no idea what they're getting into.

At another time, Sunset might have been the one person who could convince the student body that these three were not the Dazzlings. Right now, no one will listen to her.

The four of them have each other, but being associated with Sunset marks Adagio, Aria, and Sonata as suspected cyberbullies, and being associated with them marks Sunset as an evil monster (again.)

No idea what you should expect regarding updates.

It's like this: I realized that, if I set out to write the beginning of this, I probably could. Given that my depression has been generally stopping me from writing anything, it took that opening and started writing. I wrote for five and a half hours straight. That sort of thing isn't likely to happen twice, not until my depression is under better control at least. Also, I have no plan.

Updating doesn't require a marathon writing session (or a plan), though, so it could be that I'll have an update soon. Or it could be that I stall out and it's stuck sitting where it is for ages before I manage to update.

Why This Exists OR Credit Is Given

At some point after Cojo5536 suggested that Sunset meet the human Dazzlings in a forum post, I mentioned that River Road once commented on how much Dazzling Doubles by icecreammac resembles an AaM fic and referred to Cojo's idea as "crossing the streams".

(I haven't read _Dazzling Doubles_ myself.)

After about three hours of that marinating in my head, I decided to start writing. Mostly, as noted above, because times when I can write tend to be rare.

For those who might wonder, the cover art is my own creation based on a screen capture from Rainbow Rocks,

Anon-A-Miss, a mysterious internet user who corrupted Canterlot High School. Everyone have accused Sunset Shimmer of this betrayal, even her friends have abandoned her.
Now Sunset is alone, as she once was, and depends only on herself to start again, among shadows ... New faces, and not so new ones, will come to her life.
Will Sunset be happy again? Canterlot will ever know the truth? What will happen to the magic of friendship?

- "dark" label due to psychological conflicts and a certain degree of physical aggression -

- All chapters have been editing and correcting by icecreammac-

After being abandoned by her friends after a Mystable user by the name of Anon-a-Miss starts spreading rumors and personal secrets. Sunset is left alone in her darkest moment, left with nowhere else to turn to she decides to end everything. until a certain trio decide to step in.
Can friendships be saved or are they meant to stay Broken?
------------
Heavily inspired by the holiday special 2014 and the stories by the talented Small Muffin and Dainn
Anon-a-Miss By Dainn
In a time of need by Small Muffin

This story is a sequel to Last Light

"You probably thought the pain would disappear with you, but it didn't. It just passed on to someone else."

Twilight Sparkle returns to the human world following her conversation with Sunset. She's not sure what she's looking for.