Derpy explains her medical condition to her daughter.

After a mishap with Twilight's magic, Rainbow Dash finds herself split into seven different ponies.

A very fun story

Hey everypony! oppes, i mean, every'brony.' Heheh, how's it goin?

Good, you? I've been great! Just got some cider so i have spare time now. I want to talk to you guys!

No pony takes me seriously when i say that there are people watching us, yet you're allways there! Just over that glass wall...

(Really talk and reply to pinkie for the best effect-ie)
(Inspired to make this fic by the cover picture, made by this guy here http://misterbrony.deviantart.com/art/The-4th-Barrier-281796908)

An unfortunate event gives Princess Celestia a fresh view on her life by forcing her to see the world from a very different viewpoint. With Equestria changing around her, she is faced with a personal crisis... if she can ignore how cute a certain lavender unicorn suddenly looks to her.

Featured on Equestria Daily!
And some site about horse porn!
Liked this story? Read the sequel.
And the story this was a sort-of prequel to.