Flurry Heart is able to leap through Time, Space, and Dimensions at will. But there's a little more than just 'leaping through'. She can alter them, either by messing with historic events, or by magically merging Dimensions together.
She's merged several together, giving her a small flock of little cousins. But Twilight wants her to stop. How can she stop when she's just trying to fix things?
Obviously, in the future. Probably around 17 years in the future.
Part of the Cornerverse Continuity
Rated Teen for minor swearing and some dark ideas
Chapters (1)
This is good. I like this.
This story is very interesting, but I don't think it needs the dark tag.
8481151
It's certainly not the darkest, but Flurry discusses the fact that she watched Twilight die over and over again and the whole point is that AU Twilights are dead and she's hiding that fact from small children to make them happy again. That's pretty dark, but it's like a 'dark if you stop and think about it' dark.
8481290
Got it.
Wow, the ending was unexpected, but really funny
A nice counterweight to the more serious and heartwrenching atmosphere of the rest of the story. It may be short, but it is very powerful. Except some occasional typo or little shaky punctuation in direct speech, I can’t say anything against this story 
I think I shall check out more stories from your verse.