appledashed
Twilight and Luna are the least loved alicorns. But to get through their immortality all they need is eachother. Luna raises the moon one night while Twilight has lost control flying. She crashed into Luna and she accidently uses a spell to cast the moon up permanently. And the only way to get it down is 3 alicorns know how to shift the moon. Twilight and Luna study together and have some fun times. The rest of equestria is sound asleep.
Soon after the speak has been complete they fall in love with eachother. They tell Celestia but she disowns them. It is illegal to be homosexual while your an alicorn. So she takes Twilights horn away. But since she needs Luna she keeps her as an alicorn. Luna helps Twilight through the mess. And they don't need to be alicorns to love eachother. Twilight moves into the palace without Celestia knowledge and Luna casts a spell to have a child with Twilight.
(Really random I know but I promise it's good if your a Twiluna lover or just ship them. I like that ship but I'm writing this for the fans)