Bit of a rag-tag bag of stories but I highly recommend them all. Written in Dust is I think the first major story I read and is Human in Equestria done so right. Needs so much more love than it has received. Project: Sunflower is another great example of Human in Equestria done right and an amazing expansive story. An Affliction of the Heart is probably the best changeling story I have encountered on here and has 2 great sequels (1 in progress) Past Sins is a story of Nightmare Moon in a whole different way, if you haven't heard of it or read it click it now. Yes right now. Xenophilia is not for those opposed to clop as it is really quite heavy on the stuff, however the characters, emotions and their development makes it more than worth a read.