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// THAT Letter 
// Story: Luna's Librarian, Twilight's Moon 
// by TheLastBrunnenG 
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Dear Princess Celestia,

Since you sent me to Ponyville to learn the magic of friendship, I learned that there is a world outside my books. It’s a world worth sharing, and I have you to thank for showing it to me. I met ponies who would stand by me and by each other through every trial, and I am proud and honored to call them all my true and lifelong friends. I knew that my studies of friendship were far from over but it took somepony very special to show me the next step.

“Twilight?”

Over the past several months I learned that beyond the bonds of friendship lay new possibilities which could only be explored by two ponies who felt as one.

“Twilight Sparkle?”

“Just a moment, Luna. Let me finish the first chapter. Er, paragraph.”

“Thou art rambling.”

“This isn’t rambling, it’s…”

“Speaking much while saying little? I believe this is still the definition of ‘rambling’.”

“I am not rambling! This has to be said delicately, and getting to the point too quickly could ruin the suspense.”

“This is not the next Great Equestrian Novel, Twilight.  Perhaps I should assist in penning this letter, in thy voice? It does concern me rather intimately.”

“Maybe you’re right. Here, you give it a try.”

Dearest Sister,

“Luna!”

“Ah, apologies. Force of habit.”

Dear Princess Celestia,

Of late I have discovered that my bed is no longer cold, for thy Sister warms it for me.  I find her quite fetching, and we enjoy playing ‘Princess and Royal Vizier’ among other diversions.

“What are you writing? Why are you hiding the scroll? Let me see that!”

In addition I have declared Luna's kisses to be quite legendary - I believe my exact words were ‘I should pursue a Doctorate in Love, because I could write a dissertation about your lips’.

“Give me that quill! Hand it over! Give! Me! That! QUILL!”

Your Sister’s One-Time Royal Concubine,

Twilight Sparkle

P. S.  Please forward from the Royal Library a copy of the Kamare Sutra. Luna’s birthday is coming up.

“Let’s put that one on the kindling pile, okay? Please? I see that smirk! There, that’s better. Would you actually have sent that to your sister?”

“Once the scroll is sealed, my Twilight, it looks like any other. It would not be the first time Spike has unwittingly dispatched some truly fascinating reading material to Celestia.”

“Wait, what? Which? Oh, never mind. This is supposed to be a friendship report, after all, so maybe I should have written it as a report to begin with. Let me see, where are my notes?”

“You kept notes? Even during -”

“No, no, no. Afterwards. Two volumes, actually.”

Dear Princess Celestia,

I am pleased to report that my overall friendship level has increased by sixteen point six percent, though the aggrandized total is closer to a twenty four percent increase thanks to Luna’s stature. I first noticed that she meant more to me than merely a friend as I began to document an average fifteen beat per minute increase in my heart rate when I was around her, a phenomenon I did not observe in other typical friendship situations. The quotient of

“Luna, what are you doing?”

“Sleeping. Does it appear otherwise?”

“No, I mean the snoring.”

“Thy dryly clinical report hath drugged me. Indeed, I believe you have significantly improved on Starswirl’s own ‘Sleep of Ages’ spell.”

“Very funny. If you can do better, then by all means, by my guest.”

“So I shall.”

Dearest Sister,

It is my sworn duty to inform you that the Night Sovereign hath taken a mate. By Lunar Law the subject of which hath been ensconced with all appropriate titles and responsibilities, including Concubinage. We therefore request thy leave to pursue our duties both Heavenly and romantically in tandem with our mate, for her status as

“No. This is a friendship report, not a Royal Proclamation.”

“Do you not wish to announce our relationship? To have heralds carry our good news to all corners of Equestria?”

“I do, but not quite like that. Maybe something less formal?”

“I am a mare of formality, Twilight. For centuries, the comfort of ritual and formality were all that kept me whole.”

“Well… Could we write this together? You can make a formal announcement later, if you like. But let’s get this one to Celestia first, and then we’ll take it from there. She deserves to know.”

“You are correct as usual, love. Your scant few years do not betray the wisdom you possess.”

“Stop, you’re making me blush! Now, how do we start?”

Dear Celestia,

We are in love. We understand that only a Royal of equal or higher rank may perform a marriage of another Royal. We therefore ask if you would consent to perform a ceremony…