***
"Tia!" Luna rushed after her sister with murder in her eyes. Her hooves wheeled around one corner, then the other, chasing a white flank with a swishing, mutlicoloured tail. "Sister, get back here! It is our pie! You cannot..." As she gave half-hearted curses between breaths, it dawned upon Luna that sitting dormant inside of a magical construct of shadows and darkness in a dreamlike state in the middle of a giant space rock was a poor way to stay in shape.
Luna watched as her precious, delicious moonpie levitated across the hallway, and she raised her rump and lowered her chest in preparation for a bounce. As she jumped, a set of purple hooves claimed the pie and left Luna to collide with and embrace a nearby statue of Prince Blueblood. Stars swimming around her head, Luna shook herself and then glowered at the ceiling where the former Element of Magic was no doubt lurking. Her horn lit up, blue magic illuminating the entire roof. Twilight wasn't there. Luna gave a snarl of frustration, her wings beating as she flew circles around the hallway.
She called out into the dream mist, her telepathy searching for the signature of Twilight's dreamstuff--happy dreams of textbooks bigger than a mare's chest and nightmares of unmarked check boxes. She was rewarded with a visual of Discord in a speedo. Luna screamed. Hooves clutching her temple, she gave several undignified, strangled sounds more at home in the throat of a rather large turkey than the royalty of the proud equine race.
Her look of horror was enough to send a pair of mares into a fit of hysterics from behind a tapestry depicting the Hearth's Warming Eve founding. Luna lifted the tapestry with a stare that could make Fluttershy's look reasonable. "I hope thou art very proud of thineselves."
"Tia was teaching me how to prank." Twilight squeaked from behind a blush. Celestia, despite herself, cooed. If these were to be her final moments, they were to be spent admiring how adorable Twilight was, not begging for mercy she didn't deserve.
Luna merely scoffed. "The things I have gone through to get a pie We baked. Your merriment and folly hath made it spoiled with cold. Therefore, we decree a better punishment for thou and thine ilk. We shalt use this pastry..." She levitated the baked good between the guilty pair. "...As a teaching aid."
Luna promptly smashed the two faces through the pie, so that they were stuck in a gooey, sticky kiss. Celestia attempted to say something, but found the contents of the pie had stuck her tongue firmly against the roof of Twilight's mouth. The ferrymare of dreams left the pair locked together an attempting to pull their faces apart with a smirk on her face.