I just recently started to write stories directly towards the FiM actively, though I have been writing for years, publishing numerous stories at Mibba and the eventual pony story, as far as to the MLP
Sweetie Belle is about to go on the educational experience of her lifetime at Hogwarts School for Witchcraft and Wizardry. In exchange, Theodore Nott is going to have a Seventh Year beyond any of his expectations. In Equestria.
Sweetie Belle is curious, just like any little filly her age should. Just that she just had to ask, and Rarity is the natural first Pony to go to. What the response and the answers will be, is why she asked in the first place.
Two foals arriving in Ponyville, the filly Lost and the colt Guard. Where they came from and how they came there is a mystery. Yet, one part of destiny is already known.