Twilight Sparkle wakes up one morning to a harsh dose of unreality. She is stranded, without her friends, on an island which matches no known locale on Equestria. Surrounded and harried on all sides by the alien and the dangerous, she will find her mettle sorely tested, and find perhaps that the best friends you will ever have in your life are the ones you make when your back is to the wall...

Thanks to CedricBale and noobie56xx for tracking down the name of the artist so I could give them credit.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

This story is a sequel to Honey Pie

Pinkie Pie and Sweetcake ought to be able to live happily ever after. After all, he helped save Ponyville, and Celestia herself publicly acknowledged him as her subject, despite the fact that he's a changeling. The ponies of Ponyville should welcome him with open arms. It turns out, however, that the fact that some of them don't is going to be the least of his problems.

Cover art by dreamingnoctis.