Big Celly's Day Off

~ IX ~

And the Best Princess Goes to...

Celestia flogged herself against a building and held onto it for support, so drained in all regards, mentally and physically, that standing was trouble. Holding onto the corner of the building in regaining her breath, she looked at the center of the intersection, seeing waters, sloshing, into the road's drainage.

It looks as though somepony will have a better time walking down there today.

She continued to pant, now, for reasons beyond exertion.

Whatever... came of me there? I-I don't even want to think of the last time that I acted like such a teenager. Her breathing started to slow, and composure flooded throughout her once more. To think I had all of that inside me. So much wrong, and, yet, so much fun! And the ponies! How are they?

Her eyes swept over the tops of buildings, seeing the dots of her subjects, laid back in lawn chairs. Those on the street were sitting. Not mad or glad. Stunned it seemed. Even in lowering her muzzle to one, so gigantically before him, the pony could not seem to be broken from his daze.

It... doesn't appear any of them are raising a fuss. Is that really the way of the world? Cute mares doing cute things can please themselves however they wish? Maybe not all the time—but right now, certainly.

Celestia looked off into the distance, seeing her sister, in the middle of four towering sky rises, on her back legs, forelegs together, massaging a cloth up and down the sheet of glass. She giggled. Maybe a part of her did pull this stunt to clean up after her mess.

That's how we used to be, back when, in less responsible days. I would act as I pleased, and you would clean up the mess. You were the younger sister, yet, you were always sorting out my troubles. Even now, a touch of that hasn't gone away.

That conversation with Castaway flashed to mind. The closeness she once shared with her sister. Watching the sky, silently, tea for one, coffee for the other, able to enjoy it. But there was a time even before that. When the mares were teens and fillies. The games of tag, or hide and seek, of the foolish things they used to dream up on the spot.

When's the last time you and I had some fun together, little sister of mine?

Celestia bounced off from the building with a return to her hooves. Knocking around the world a little to the cracks of stone in the air. She strolled with a gait toward Luna, not without looking to her side, a fantastic cap, a sailor's, left on a building.

In putting it on, with a pull over her mane and covered eye, she walked to a taller building of glass and liked her reflection. Certainty a strange maid to be—but Celestia made it work. In looking out to those buildings, though, another idea arose.

She walked toward, with revenge, and a touch more, set on the mind.

Luna cursed underneath her breath in finding a hardened texture on the glass that, no matter how powerfully she concentrated her wiping on it, the material, the near crust, would not break. She was clueless to its texture beyond its odd smell. Biological. Yet unknown to her.

She pulled the rag away for a smidge of it to still be there. Those on the other side of the glass as though it were a screen to the cosmos. Luna's face was like a planet, the lifting of her hoof, a moon, as its edge was licked.

It came forward with a titanic sound and squeaked throughout the building on its contact. The wiping of glass caused many to fall, sealing hooves over their ears, as the dome, sealed over the spread of the window, cast the place in the darkness for a moment.

On the other side, and with the hoof removed, Luna brought back the rag, scratching at the spot again. Harder and harder but not so hard as to crack the sheet. Once she was done, all was pulled away to reveal the stain still there.

Luna huffed.

Until being tackled from the side.

It was a running blur of white that quaked the world and shook the buildings and was like a nuke fired like a bullet. White followed by the cosmos as the haze bolted into the sitting sister. Luna scarcely realized what happened until she was pinned onto her side, a much larger mare laid across her.

Celestia straddled her with ease.

"C-Celly! I mean, Celestia!" Luna rolled on the ground but could only shift between the ivory density of legs. "G-Get off me this instant! We still have a city to clean! What do you think you're doing?! Are you trying to create more of a mess to—"

Luna was interrupted by a lick across her cheek. It traced around the curve of her eyes and dropped at the start of her ear. Warm breath tickled into that place. As did a hushed whisper of glee. "C'mon, Lulu." Her heart shrank at her hearing her childish name said in a childlike voice. "Come play with me."

Luna huffed and rolled still, her muzzle laid on its side, eyes looking into some parking garage. Her snout, in unleashing its gales, blew through the various levels—blasting everything over and sweeping ponies, momentarily, into the air.

"What are we?! Fillies?" Luna rose the side of her barrel by an inch but, in so doing, the other had dropped her massive rear again. Rubbing back and forth like a little kid demanding play. "We're princesses, Tia. We cannot simply take a day off because the mood dictates it!"

"But Luuuuluuuu! The city's already a mess! The ponies don't seem to mind! And we always clean up afterward." Celestia's muzzle dipped behind that of her sister's, at the collar of her outfit, starting to tug at it. "Besiiiides. I know a few games that we can play that you will like."

"I'm not a filly anymore—and neither are you!"

"Because we don't let ourselves fool around every once in a while." Celestia's teeth found the zipper of the outfit and, although Luna should have struggled at this—she didn't. The past became the present in an instant. After firing off every reason for why something shouldn't happen, if persevered through, would see to the other mare, reluctantly, joining on the regrettable adventure. "Think of this new playground we get to have some fun in! Couldn't you see it?"

"What? Hide and seek, in which, you lay down on the roads—with me set to find you?" Luna barked off and, even though her tone was supposed to be insulting... its edges caught with the enthusiasm of fun. "Or running around these buildings, catching the other, in a game of tag all throughout the city?"

"Exactly yeah!"

"That's not the purpose of a city!"

The zipper went all the way down to over the crotch of the little sister, where the fabric spread to reveal the striped underwear beneath. Nothing fancy as it clung to the midnight crotch, squeezing the flanks, lazily, behind.

"Mhmm... how about a bet?"

Luna froze at that. All fights, struggles, and words—called off.

"Go on."

Celestia rolled her eyes at the logic of her sister as, what had worked in the past, once again, worked in the present. She brought her muzzle away from the joined thighs of Luna, starting to pull at the corner of her outfit. "It's always been your opinion, since before the moon, and after it, that you have a better rump than me."

Grumbles. "Quality over quantity, Tia." Then a groan. "We've been over this a thousand times."

"A thousand times not recently," Celestia continued in pulling the outfit over Luna's foreleg and then dipping to do the same with the other side. "We don't talk anymore. Much less tease or anything. Too formal to be sisters anymore."

"I'll always be your sister at heart, Tia," Luna responded. "You know this."

"But knowing isn't enough! I want to experienceit now, again.” Celestia pulled the other side of the outfit, although it would be up to Luna to take it off. She continued to sit on her, if only to be safe, but lessened the pressure. "When's the last time you let the utilitarian in you become petty?"

"That's... not how that line of logic works, sister." Luna played around the subject with her lips, becoming submissive, little rolls of the eyes in following through on the request. "And I only allow myself to become that petty around you. Though, that..."

She went silent.

Celestia smiled.

“So here's the deal.” Celestia rolled off her sister and sat to the side of her, as the latter then rose, sombrely, coming to dust herself off a little. "I think it's about time we put this ageless question to rest. My rump or yours. Which one is truly better?"

Luna scrunched her snout, a blush around it, as she dipped her head. "The ponies of this era are not qualified to possess the needed depth on this subject."

"The subject of butts?"

"The subjects of derrieres and posteriors, Tia!" Luna slapped a hoof into her face and wiggled into it. "For the goodness of the morning and the night, Tia, please watch your phrasing! You're a princess! Although, sometimes, I think it's just a teenager underneath the tiara."

"Prisoner beneath that tiara."

"Tia! Watch your tongue! Subjects can't ever hear you say that!" Luna was starting to lose it as her voice developed into a whine. "Much less butt or even rump! What if Cadance were to hear of you to speak of the one with an 'A'?"

"Ass?"

"Tia!"

"But she's already gone." Celestia looked over her shoulder to the expanse of the city behind, able to see its outskirts, the start of woods, a paved, crushed lane across it. "As is that plan you had against me. Easy to crush that, by the way."

"Ugh." Luna with a muzzle drowning in two hooves now. "If beggars can't be choosers, then there's little point in begging." Her eye lifted over the edge of her hoof. "What did you do? Where did you send her off to?"

"Teased her a little and sent her on her way." Celestia tilted her head and tapped her chin. "Probably rutting a mountain by now as little Shiny watches on."

"Aaaaaah!"

Sometimes Luna could fulfill her role of the little sister, that was, to drop back on the ground, rolling, a spasm of kicks to her legs. Celestia merely sat there, still tapping her chin, as the rest of the world watched on to the eccentric sisters being sisters.

"Naaaagh! Alright already! Just lock me up will you?" Luna stopped on her side, pouting, a mass of dough that melted onto the street. "Return me to the moon for jest or imprison me in your articles. I have been defeated. The day is, once more, yours.”

Celestia didn't like that. Not one bit. The shake of her head reflected that.

"I much prefer to think of the day, at least for now, as ours." Celestia held out a hoof to the little sister, who did not move, still sulking, with the hoof needing to be shaken before her snout. "And there's still a way for that plan of yours to work. Might I return us to the matter of our bet?"

Luna huffed. "Proceed."

"Throughout this little ploy of yours, I'm sure, you've taken a notice to all the ponies enjoying a fancy of you." Celestia grinned as Luna's ears flopped down. "Maybe you're not used to that kind of attention, but, after a while, it started to feel good, did it not?"

Luna frowned.

"C'moooon." Celesta's muzzle nuzzled into the coating of Luna's neck. "Tell your big sister the truth."

Luna rolled her eyes. "Fine. 'Tis nice... to be appreciated on the most lowly of matters."

"Don't give me thaaaat! You wanted to give your tush a shake at feeling all the eyes staring."

"Did not!"

"Did so!'

"Did not!'

"Did so!"

"Did not!"

"Did not!" Celestia said. "Did not! Did not! Did not!"

"Did so! Did so! Did so!" Luna barked back with a glare from the street. "Who are you to tell me on the matters of my rump? I wanted to knock over a building and let it harmlessly rain on all of them! Did so! Did so! Did OH NO!"

Another slap to her muzzle. "Gaaaah! How do you always get me with that?”

Celestia stuck out her tongue, looked aside, and posed innocently. "Bigger sisters always knooow beeest!"

Luna fumed. Cold body becoming warm. Furs brushed, now puffed, like a kitten purring. Slowly, she rose, clambering on her hooves, seating her own doughy behind on the opposite sidewalk. In the opposing buildings that were behind, those in the lower floors, looking on, enjoying the view of the sitting mares.

And how their rumps elevated them levels from the ground.

Then Luna spoke. "I still have the better rump."

Celestia barely looked back. "Mine's bigger."

“Mine's firmer.”

"I have more density."

"You're an overflowing marshmallow!"

"And you're only slightly less narrow than Cadance."

Luna glanced down and, although she fought it, a smile cracked on her lips. "Okay. We both know that one is not true."

Celestia broke into laughter, to which, she spread a wing around her muzzle to hide. The sisters couldn't help but laugh in their superiority to all in some issues. And then, once the laughter died down, the wing was pulled back.

"Seems as though I've gotten you into the fighting spirit," Celestia remarked with a nod. "And tell me. What point is there in having a good rump than to show it off? So let us place a bet to the ponies of this city."

Luna's muzzle was dipped with a hoof supporting her chin. "Let them decide? But you have always been the most popular of us both." She gestured out a foreleg. "You will win on that fact alone. I have close to no support on this."

"Is that so? Luna, dear, have you, perhaps, glanced behind you at all?"

Luna's snout wrinkled. But she did as she was told. Inside the buildings, stacked against the glass, the ponies looked up the crawl of the giantess's back in time to see her muzzle turned over her shoulder. How she looked and saw them all. The masses piling in, not away from the glass—but right against the danger.

All for no greater reason than to stare at her.

She blushed in a way she thought unknown in turning back, adjusting herself in place, more so for show.

"You... probably have more in your building."

"About the same."

"...really?"

"And we can switch if you wish it." Celestia lifted an eyebrow. "Both of us have an equal playing field here. So how about it? Do you agree to let the ponies, here and in this moment, to put this game of ours to rest?"

Luna thought about it for a second. "What are the terms?"

In the vast roundabout in the middle of the four buildings, where a few ponies stood, they looked out, one side to the other, into the expanse between the giants' legs. How the mares sat like fillies in a cramped sandbox, talking, and playing childish games.

How they both, if only a little, leaned back into the building, to a squeak of glass, a boom of sound, and sealing of darkness as their lower backs rubbed into the places. Forelegs crossed as they waited for the conditions to be set.

Celestia looked down and undid the rest of her outfit until it parted at the underside of her barrel, its end resting on her thighs, teasing to the underside of her belly. She then glared forward at her sister. "Should I win the vote of greatest rump, you agree to shrink back down and leave the rest of the day to me—joining me, of course, wherever you may please."

Luna tucked in her lips and glanced aside with a demure expression. "Not the worst terms." She looked back. "And what of my victory?"

"Well," Celestia began with a bit of a slur, a muzzle lowered, an eye raise, its brightness a luminescent pink. "That depends on how much you'd be willing to go back to our... adolescence days. The times, barred, from other mares and stallions."

Luna's eyes exploded open, and her blush rose with it as everything on her puffed at that moment. Her forelegs crossed between her thighs as the giantess could not hide her sudden panting. She wanted to speak, to deny it all, and yet, she did not.

"Instead, you would get to keep your size, and to have your big sister become your little sister." Celestia was blushing too, unashamed of it, as it only added to her attraction. It was a genuine tool and it was being used. "You could store me in any place, have me tend to anything, for the day. Be it you lying on your back as I explored your tummy... or travelled to the jungle lower than that."

Luna's face squeezed as her hooves dove into her special place. Rubbing there to keep it under control—like an itch that shouldn't have been scratched in public. Her eyes opened in the realization of her shame. At once, she stood, ready to assume battle. "How do we do this!"

Celestia smiled to one cheek as she rose, looking down as her outfit hung, starting to pull it off her; Luna copied her sister, with her teeth to pull out her forelegs. None of them cared for privacy. Undressing before thousands as the many were lost to the amazement.

Each mare tossed their article to the opposite side without care for it to land. Those in the parking garage were found in darkness, a weird, draped texture outside. A pleasant odour wafted throughout the place.

Across the street, the other outfit caught on a corner of a building and hung from there. Both mares had to wiggle their rumps to squeeze out from the rest of the clothing. Once they were done, they stood, facing the other, each wearing a pair of underwear.

Luna did not flinch in the strolling of her sister behind her. Celestia towered above, sure, although her mask of confidence could fool the world—but not her. Luna stood still, proud, and always facing forward. She spoke without looking to the oncoming force.

"And just how do you propose we settle this to them, sis?"

"Easy!" Celesta exclaimed from behind her and, because Luna did not turn, it all went to the other's place. Within seconds, the bigger sister flipped, turning around raising a leg over Luna's backside—starting to straddle her. "Like this!"

Luna endured the immense force atop her plot as hind legs slid over the sides of her barrel. Locked between the older sister's thighs, she was forced to stumble back as Celestia drove them backward.

Those inside the building had been watching the giantess clamber onto the other and, at once, drove them back. Everyone watching as the collection of booties were hurtling toward them. Growing and bringing shadows of peaches with them.

Rumps became larger before they struck the glass, a bend to the substance, as the lofty sheet endured the softest of immense pressures. The backside of the flanks had flattened into the windows, the suction casting darkness over the cheeks.

Every butt needed multiple levels of flooring to be adequately seen.

However, far away and to the right of the pressing booties loomed the faces of the sisters. Luna's head pushed down as Celestia's laid her muzzle across the former's scalp. Celestia looked back with a tongue suck out, which she let lay on the curve of Luna's horn.

While Luna, glaring up at her sister, couldn't help but blush with a mouth open in a smile.

And then Celestia spoke.

"Citizens! My sister claims that she has the prettiest plot in the family. Tell her that mine is far more spectacular!"

Luna gasped in faux rejection.

"Nay, loyal subjects!" The little sister giggled in this childish game she was all too happy to play. "It is the princess of the night who has the superior posterior! Tell my sister that she may raise the sun, but it does not shine from her backside!"

What these sisters were asking, of course, was an impossible choice; the stacks of bottoms pressed into the glass, a rub in circles, the sound, somehow pleasant. The muscles in Luna's rump had flexed in supporting her sister's weight to show how firm they were.

Much like before, the two were together, like posing for a photo, sticking out their backsides with the total knowledge of how much each was worth. Sometimes thrusting, together, back and forth, to send trembles throughout the floors.

Luna's rump was a lot more condensed. Her underwear clung to the sides of her flanks, squishing it, to the production of more curves. She was more full, thicker, details able to be pointed out.

Celestia, however, was just enormous. So large and impossibly full that not one particular thing could be pointed out about it—beyond the immensity of the item. It dominated one's vision. Sprawling beyond any possible frame. It was something that teased for how much further it went on.

And her golden panties curved with those cheeks, as powerful as the sun itself, to the same effect of staring at them for too long. Those who were blinded due to the brightness were so because of the image.

Soon the cheers started to break out. The masses of little shadows, jumping and shouting, the waving of forelegs. None of it could reach the sisters. Beyond the touch of a whisper that was wiped out by the winds. Celestia clicked her teeth and glanced down at her sister's face.

"Dear me, sis." Celestia laughed and nuzzled into her sister's mane. "It seems as though we've run into a problem."

Luna smirked. "Indeed. They all seem to be cheering."

"But whoever for?"

"Me."

"You mean me?"

"I would have said you instead of me."

"Hmm."

Celestia took a second to enjoy this. Nuzzled across the back of her sister and applying the faintest weight to her barrel. Being close, snug like this, acting like the teens they were never allowed to be—this was a glimpse, a one-time event, into a different way of life they could have enjoyed."

"Say, dear sister, I have another idea."

"Do proceed."

"It seems we have a cheering crowd with none finding dissatisfaction with none of us." Celestia giggled in plumping their rumps into the building, hearing a near crack, as both of their butts squished even more into the windows. "How about we call this a draw for now, and instead, come to entertain our subjects—together."

Luna didn't even need to think about it. "I would like to do that with you, Tia." She smiled. "Like to do it a lot." Then that smile transitioned into a smirk. "But don't you think I'll be letting that idea of you being my little sister go anytime soon!"

"Wouldn't plan on it." Celestia grinned as she took them away from the glass, the smudges from their rears on the glass. She rose herself a little from her sister's plot, still keeping it between her legs—which she then spread. "I'm too spontaneous for that."

Luna ducked a bit beneath her as she nuzzled into the underside of Celestia's jaw. "Which leaves me confused, sis, as to what we're to do here."

"Easy! What's the thing you and I have never done together before strangers?"

Luna thought about it, and then, thinking about it like her stranger, couldn't help but laugh with a roll of the eyes. "Shake our... asses before strangers?"

Celestia winked with a click of her teeth. "Shake our asses at strangers."

Luna ducked her muzzle to the left, and Celestia did her own to the right, looking back at the building, at the roads to the sides of it, all of it filled with streams of ponies. They smiled and laughed and then started to do their things.

Celestia would swing her hips left, and Luna would do hers right, the bottoms waving in reverse directions from each other, teasing to how the flanks beneath were shifting beneath the underwear. The two kept this on with a laugh, in strutting their stuff, to a cheering city.

The evening had passed quicker than either sister would have liked as, after their show, they decided to play like the fillies they were. Ponies were instructed to not be on the sidewalks and streets as, at any second, a sprinting, bolting mare, could tear through it in quicker than a second.

The rumbling and rattling throughout the ground as the booms of immensity neared.

There came times where, in returning to those skyscrapers, one would cling to the corner of it, shifting around it, as the other sister slowly approached. Each circling around it, keeping away from the other, waiting for one to make the first move.

And one did, the other ran, far away.

Hide and seek was a bit harder to play. One could lie flat in the street, but could easily see them over the tops of buildings if the other rose onto their hind leg. In needing to cool off, both returned to the port, with Celestia running, jumping, and doing a cannonball into the waters.

And Luna, slowly slipping herself inside, barking at her for the torrents of water that splashed onto the land. That bickering ceased at the first splash of water from her sister. Luna returned this by shoving her hooves into the water and doing the same. The two played while, between them, passing ships attempted to survive the rocky waters and sail around the towering mares.

With the closure of the day and the darkening of the sky, this left the two, in pulling back onto the port, each laid back onto a lane, to rest for a while. Sunbathing and relaxing. Clouds of grey formed above. Out in the sea, waters started to swirl.

Celestia groaned.

Luna glanced over from over the block of water that separated the two piers. "Something the matter?"

Celestia looked back. “He'll be here soon.”

"He?"

Celestia squinted an eye. “More so it.”

Luna frowned. "Are we scheduled for a monster today? Don't we usually leave that to Twilight?"

"We do." Celestia laid her head back, looking over her mane, seeing how the shipping containers draped over and locked in knots to it. "But I wanted to have the full experience of a full day. Its arrival is partly the reason for the growth in size."

"Ahh."

"But now I'm tired, pooped, and don't want to fight him anymore."

"Think you could ask him to leave or to reschedule?"

"Not that kind of monster."

"Think you could shake your posterior at it for it to leave?"

"Would probably try to eat it."

"Isn't that what all the mares and stallions are raving about these days?"

"Not that kind of eat, Lulu."

Luna thought on it for a while as, in the distance, thunder roared, lightning struck, and winds threatened a tornado's approach. The perfect beach day, ruined, as the two arrived in the sunbathing part. "Do you think I could take him? Been a while since I was allowed to play the hero."

"Most likely not and of no fault of your own—I could hardly take him alone." Celestia went to sit up with a struggle to do so. Feeling like someone who knew they had to go to work... but were still wishing the pros and cons of missing a day. "I have a battle outfit that's composed of sections of functional ships. Few planes in tune to the frequency of it."

"And could I not wear it?"

"The dress, sadly, would not fit."

"Ahhh."

Silence.

"But... maybe the fight would be easier... if I had a captain abroad?"

"Consider me yours, Tia."