Princess of the night and Nightmare Moon; two names used interchangeably in the Canterlot castle.

There was always a piece missing in Luna's life since her return from banishment; a sense of belonging, of acceptance into the modern society. She could never tell her sister of such feelings, but she aslo couldn't keep them to herself. In a series of letters sent into Oblivion soon after completion, Luna spoke of her true feelings, of her true fears, aspirations and worries. But what if these letters weren't sent into Oblivion? What if they were sent to place where she had a reader?

What if this reader were to write back?

Boring life. Boring job. Boring friends. Would I trade it all away for a new life in a new world?

Hell no.

Do I get a choice in the matter?

Fat chance.
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Not HiE per se; more like (Insert creature here)iE. No Mary-Sue, no self-insert; just a regular, cynical guy whose life became a bit more...Chaotic.
Not a 'Human in Equestria turned pony' story.