You can find the story here: http://www.fimfiction.net/story/39849/rites-of-ascension
It’s in my queue to read, but essentially, a very different take on Twilight becoming an alicorn. The quick explanation: She has to EARN those wings.
This was a massive piece to do with 9 characters (only 3 full body, though) and a large background. These big things are an excellent and fun challenge, but probably not something I’ll take on again anytime soon. “