PONYVILLE, GOLDEN OAK LIBRARY...
"Twilight, would you go to sleep already? All your pacing is keeping me up!"
"I'm sorry Spike, but I can't sleep. I'm a little... a little..."
"Homesick?"
"Worried."
"Worried about what?"
"That I can't do more for Princess Luna. That I have to be here when I want to be there."
"Hey, you read the letter, right? Your bro's got that covered no problem!"
"That's not the point, Spike! I'm worried B.B.B.F.F. is in over his head with this! There's all those ponies that hate him because of me and Cadance. And what's going to happen when Cadance comes back? The only alicorns Luna knows about are her and Celestia, there aren't supposed to be any others!"
"You think there's going to be a fight?"
"I know there's going to be a fight. Remember the time I accidentally spun up one of the mixers in the kitchens too fast with my magic?"
"Wasn't there a big bang and stuff flying everywhere?"
"Exactly!"
"... So, what's your point?"
"My point is that not every guard is like B.B.B.F.F. You're too young to understand it yet, Spike, but you can see it in their eyes. They want him gone. They're jealous. They want what he has but can't have it themselves. So they will trick, they will lie and they will hurt other ponies by spinning up that metaphorical mixer on purpose just so that they get what they want. And they don't care - don't truly care - what damage they inflict in the process."
"Even to Princess Luna?"
"Even to Princess Luna. And there's nothing I can do here, in Ponyville, to stop that from happening."
"Don't you trust your brother, though?"
"He's only one pony! Celestia's support is no guarantee things will go smoothly! In fact, it might even invite trouble."
"You can write letters, can't you? Princess Celestia didn't say anything about letters beside the once-a-week friendship letter. At least it's something..."
"You're right. I guess that's all I can do from here."
"Good. Now will you please go to sleep? It's too late already..."
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Twilight Sparkle looks back at Spike curled up in his basket as she walks over to an open window. A moon undimmed by the profile of the monster once contained within it shines down on Ponyville and the towers of Canterlot in the distance.
Forelegs go up on the window's sill, Twilight standing on her hind legs to observe out the window. Twilight looks out plaintively into the night, and a tear trickles down her cheek as she sings softly into the night air:
"One colt I cared for
Was always there for me
Can you do the same for Luna?
Please oh please let it be
Big brother best friend forever
Like two peas in a pod we did everything together
We shared our hopes
We shared our dreams
All in danger now it seems
Celestia trusts you true
This is only something you can do
Can you teach how to fly a kite?
Can you stop this coming fight?
Though oh so far away
Strong you must stay
In order to save the day
My big brother best friend
Forever..."