Trapped In The Moon

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"SISTER!"

As Luna's ears twitched, she couldn't deny that her heart may have skipped a beat or two. Her eyes were immediately drawn down towards the noise--towards what sounded like her sister's voice. She felt her cheeks flush at the sight of a small, brown bug flying up from the toilet. Was that what was making her plot itch? Disgust and anger mixed in her mind as she gave the insect a steely glare, her magic unraveling a strip of toilet paper to catch the offending creature in and dispose of it like the filth it was!

But, as she moved to catch the bug mid flight with the tissue, something stopped her. Perhaps it was her own fried nerves, but it sounded like Tia had called for her... but that couldn't be, could it? Curiosity getting the best of her, Luna grasped the bug in her magic and levitated it closer to her face. Her muzzle scrunched as the faint whiff of horse apples tickled her senses, but her eyes widened at what she saw.

With a quick spell to make sure she wasn't just imagining things, Luna's suspicions were confirmed this wasn't just a bug that she accidentally shoved into her colon... it was Celestia.

"Tia...?"

While it would be a lie to say Luna wasn't overjoyed at finding Celestia relatively unharmed, that jubilation was tainted with embarrassment, horror, anger and sadness. The same could easily be said about Celestia; she was alive, and she was happy and relieved to the point of tears, but even as Luna was delicately washing her tiny form free of all the muck and filth it had accrued while inside her body, she couldn't help but feel anxious whenever she looked at--or even thought of--her younger sister.

In the end, Discord was the one who reversed the spell. After ignoring Luna's summoning the night of Celestia's disappearance in favor of swimming in the Milky Way--after turning it into real milk, of course--the Lunar Princess immediately assumed the Draconequus was behind their torment. After both restoring Celestia's size and spending several minutes trying to prove his innocence, Luna finally agreed it was a freak accident--one that both Princesses would look into to ensure it never happened to another pony again.

Luna remained awake to deal with the dealings of the Day Court as Celestia recuperated from her ordeal. It took several weeks before the sisters could really enjoy each others company again, and even to this day the two can never look at each other without remembering the night that the Princess of the Sun was trapped within the Princess of the Moon.