Its called "Faith" it talks about fluttershy and her secret of being a diffent species combined with a pony. and yet her love for a special pony. that would

be twilight sparkle. they get stuck in a forest and no way out. will they find a way or die trying? or will her friends be okay? will they capture the evil species also pretending to be her friends? link : http://www.fimfiction.net/story/95925/faith