Time traveling from five thousand years in the future, Twilight Sparkle—or as she prefers, Glitter-Flanks—has one mission: to establish the closed time loop that sets her and Celestia up as a couple, by flirting as aggressively as possible.
Each time Twilight tries to stop Starlight, she fails and is flung to a new, twisted Equestria, each one worse than the one before, until she lands in one that isn't worse. The only real difference is that her castle isn't there. But the library is.
Fashion goes fast-forward for Rarity when her four future selves, each carrying a magical time amulet, show up in her studio! But her destiny – and the future for all Equestria for that matter - will be irrevocably changed by what they tell he
Princess Celestia, in her infinite wisdom, comes to the conclusion that she doesn't have nearly enough time to do everything on her busy schedule. Not a problem for her, though. The solution to having no time is obvious: just make some more.
Twilight Sparkle definitely learned her lesson from her last time-travel experience. This one's not her fault. Really. Sometimes nature can be... annoying.