A survivor of a post-apocalyptic Earth discovers the magical land of Equestria. But he didn't come alone...
If there were a season four of MLP FIM.
Being a young pegasus growing up in ponyville is a lot of work, making friends, dealing with bullies, learning to fly, but if you factor in living alone on the edge of the everfree forest, things get tough. What could make this situation any worse? How about a hyperactive earth pony as your best friend.
Discord, you have competetion.
The Changelings are back, and this time, they came prepared. All of Equestria is now under the control of the Queen of the Changelings, save for a few brave souls that through their sheer wills to survive and a whole lot of luck, have managed to slip through the queen’s hooftips. None of them believed that this was more than chance of fate, but what if they were the only ones left that could stand up to the tyrant now. A mere weather pony, a family stallion, a simple musician, a soldier, an adequate magician, and hoof full of others make their way across the lands of Equestria in search of anything that will lead them to hopefully defeat the oppressive Changeling forces.
After her plans were ruined her hive now in destruction all shes has left are two young changeling. When she is saved by one of the ponies responsible for destroying her plans the great Changeling queen is forced to make certain choices. Will the choices she make now be for the better of her last remaining children or will she lose them for good?
This is meant as an alternate/speculative take on what Season 3 might be like, drawing heavy inspiration from the third season of ReBoot.
During Shining Armour and Cadance's wedding reception, Princess Luna speaks with Twilight in private, to warn her of an impending Changeling attack on Ponyville. She then assumes the role of Ponyville's military commander, with Derpy serving as her second in command.
Ponyville has become Equestria's first line of defence against the Changelings.
When Rarity wakes up to find she has become a changeling, she is mildly upset, but rapidly realizes that she'll never have to worry about a shortage of sex again... oh, and romance I guess.
Mostly sex, though.
Like really, a lot of it.
Her only problem; who should she seduce first? And in which order shall she shag everypony else?
The great Tobuscus decides to play a brand new game centered around the My Little Pony Universe, but something isn't quite right about this computer game. The AIs almost seem... real. Will he ever be able to focus long enough to beat it?