What goes around, comes around.
"Hello my little ponies! Yes i'm very happy to see you all. C'mon Luna, wave with me a little. You've got to show them that you're happy to see them." Celestia whispered into Luna's ear while they were in their royal carriage, being toured through their city of Canterlot.
"Y-Yes I do want some attention dear sister, it's just... kinda difficult for me. I'm just not used to having so many adoring subjects that're actually happy to see me." Said Luna as she looked on at her bigger sister. Apparently motherly qualities isn't all she's got working for her in her favor. She's also got a really big butt to boot. Luna couldn't help but notice how it would bounce and jiggle for every movement she made.
Celestia was also quick to notice her little sister gawking at her flanks and decided to have a little bit of fun right there and then. "Hey! Look at my flanks everypony! Gaze in awe and wonderment at the royal sunbutt everypony!" Said Celestia as she literally mooned them while they were on tour through Canterlot. Most if not all the stallions and a few mares were cheering for Celestia.
"T-Tia... stop it, it's embarrassing. Thine flanks are just too big." Stated Luna.
"Oh I see now Lulu, jealous aren't we? Well no need to be." Said Celestia. As she said this, she then reached over Luna's shoulders with her left forehoof, then slapped Luna's flanks which didn't really jiggle too much at all.
"EEP... TIA! That was very uncalled for! Why would you do that?" Asked Luna with an almost somewhat scowl adorning her face and blush.
"Because I love you so much Lulu. But you really do need to put some meat on your flanks, especially if you plan to woo any suitors." Stated Celestia.
"Thine flanks are just fine as they're dear sister." Luna replied dryly.
"Nonsense Luna! Tell you what, after today's events, i'll prepare for you something really special tonight, before it's your time for night court. What do you say?" Asked Celestia.
"If it has anything to do with my butt, then i'm not interested Tia." Luna replied back.
"HMPT Party pooper! You're such a stick in the mud sometimes you know that." Said Celestia.
Luna replied back in earnest by sticking out her tongue out at Celestia, giving her a raspberry. "GASP Why you little!" Celestia said back in mock anger. Then their tour was finally over and their carriage was headed back for their castle.
Celestia had a surprisingly devious idea bubbling in her brain. Luna might not be too happy about it at first but she'll eventually get over it, that much Celestia knew. So she used her extensive knowledge in magic to prime an enlargement spell for her dearest sister. A few weaves here, some incantation symbols there and perfect, a perfect scroll with an enlargement enchantment instilled into it. "Giggling Celestia you mad genius you. Even after thousands of years, you still haven't lost your touch." Celestia said to herself with a satisfied grin at her work.
Celestia took the enchanted scroll and then used an invisibility spell to hide it onto one of her best cushions she could find. Now all there was left to do was to call Luna over to sit on it. But Luna wasn't stupid and Celestia knew this perfectly well. But she'll figure things out as she goes.
"No Tia! I'm not taking a leave from night court tonight, it's my job to be there." Said Luna.
"But Lulu, I put alot of thought into tonight being a day for you to feel better and relax. Couldn't you just call it off, just for one day?" Begged Celestia.
"Yes and I suppose you'd want to call off one day from day court too wouldn't you?" Retorted Luna.
'Oh how I would love that greatly, but darnit she's right, i'll have to think of something else before she walks out of here... That's it! I know what to do.' Thought Celestia as she looked to Luna and said. "Alright Luna! I'll sweeten the pot for you then, I even went through all the trouble to obtain one the finest Saddle Arabian silk pillows, just for you." Celestia was seriously hoping that Luna would go for the bait.
"But I... Well that does look rather inviting. Fine dear sister, you win. I'll take a leave. BUT... for one night only." Said Luna as she prepared to sit down on the massive cushion. The cushion itself looked to be at least three times her size. And true to Celestia's word, it was so incredibly soft, like a cloud, maybe even better.
"Oh my Tia, you're right, this was a good idea after all." Said Luna as she then readjusted herself so that her small flanks would sink into the cushions center. "Gentle Sigh It's so soft and comfy, it's almost like a bed, but better." Luna said in blissful content.
"Only the best for my dearest sister you know." Said Celestia awaiting for what's soon to happen to Luna.
Then suddenly, Luna felt a growing sensation all over her butt and then got suspicious. "You're not up to anything funny are you Tia?" Asked Luna as the feeling became more and more pronounced every second that went by.
"Nothing whatsoever dear sister! It's all inside of your head." Said Celestia with a slight snicker to her voice.
"I knew it! You really were up to something weren't you?" Said Luna as she figured out Celestia's prank. "What have you done to me this time?" Asked Luna.
"You'll see Lulu, you might not agree to this at first, but i'm sure you'll come around to it eventually. Give it a chance and you may end up just liking it." Quipped Celestia.
"Please tell me that pun wasn't intentional. You never really did have a good sense of humor you know." Luna replied dryly.
"Ok Luna; First off, rude. Secondly, I feel like i've done you a favor, and getting a little chuckle out of it is just a bonus at this point." Celestia said.
Then luna's ass began to expand more wider and bigger, jiggling and bouncing more and more as it grew. "Oh no... It's getting bigger Tia! Please do something to shrink it back down. I cannot go around looking like this!" Said Luna.
Just then her ass got so big, bouncy and heavy that it completely flattened the soft cushion that Luna was resting on, much to her obvious dismay. "Tia I swear, if you don't do something to restore my flanks back to normal. I'll do... stuff to you! I don't know what yet, but know that none of it will be pleasant for you!" Threatened Luna as her as continued to expand and take up more room. Any guards passing by looked on and then immediately had nosebleeds before they fainted on the spot.
"What? I thought you wanted more attention? This is the best way for that." Stated Celestia as she pressed her hoof into her sister's massive flank and saw that some of her hoof was sinking into it. When she pulled her hoof out, it bounced back like jello.
"TIA! This is your last warning, cease this now or else..." Luna threatened with a heavy blush adorned on her face.
"Or else what Lulu, you'll sit on me?" Celestia asked jokingly while she chuckled a bit.
"TIA! Don't push my buttons! You'll regret it dearly!" Snapped Luna. If Celestia were focusing enough, you could swear that there was steam billowing out from Luna's nostrils, she wasn't pleased with her sister at all. "Don't make me get angry!" Said Luna.
"Oh no! My larger than life sister is going to squish me! What ever shall I do?" Celestia asked mockingly.
"THAT'S IT YOU WRETCH, I'M DONE BEING NICE NOW!" Luna yelled out in her royal voice as she pressed down on her massive flanks and then bounced up into the air as if her ass were a trampoline of sorts, her massive shadow aimed right for her sister. "WHAT GOES UP, SHALL COME DOWN HARD!" Luna bellowed as she was about to flatten her sister under her ass.
Celestia couldn't move, mostly out of fear of the situation, she gulped, her eyes turned to pinpricks as they were glued to the bouncing blue mass that was Luna's asscheeks about to turn her body into a pancake. "W-WAIT L-LUNA NOO!!!" Celestia yelled as Luna was coming down fast.
CRUNCH!!! Luna's flanks have made their landing on Celestia. Squashing her body under her flanks, some of her body getting wedged in between Luna's asscrack. Celestia was screaming as her body was literally being flattened into a pancake under her sister. The only thing anyone else could see sticking out would be parts of Celestia's flowing mane and tail, the parts that didn't get covered up by Luna's ass.
"I HATH WARNED THEE OF THINE FATE! IT WAS YOUR OWN FOLLY TO PRESS ME SO!" Bellowed Luna. "NOW I SHALL PRESS YOU IN KIND DEAR SISTER!" Finished Luna as she then began to bounce all over Celestia's squashed and battered body!
BOUNCE!!! CRUNCH!!! "TAKE THIS DEAR SISTER!" Bellowed Luna as she continuously bounced on top of her sister, leaving no quarter to her punishment.
BOUNCE!!! CRUNCH!!! "AND SOME OF THIS!" Yelled Luna as she continued to put the crunch on Celestia's body. Celestia's was being further smothered deeper into Luna's sweaty flanks. At least they smelled nice, that was a relief for Celestia.
BOUNCE!!! CRUNCH!!! "WE'RE NOT FINISHED YET DEAR SISTER! HAVE SOME MORE OF MY GLORIOUS MOONBUTT!" Yelled Luna as she refused to let up on her sister's punishment.
Celestia was in tears now, she knew her little sister was sensitive, but never this sensitive. her limbs were twitching as she was writhing underneath Luna's powerful flanks. Celestia knew what she'd never do ever again was prank her sister. That will be one mistake that she'll never make ever again for sure.
But Luna still never let up on her painful bouncing on her sister. "YOU SAID THAT I'LL SIT ON YOU DEAR SISTER! I'D LIKE TO THINK THAT I HAVE DONE JUST THAT!" Yelled Luna as she kept up the torturous bouncing on her sister's defeated body.
LICK!!! KISS!!! Then something happened that Luna was never going to anticipate, her sister was starting to enjoy her punishment. "WHAT!?! YOU'RE ACTUALLY ENJOYING THIS PUNISHMENT? FINE THEN!" Yelled Luna as she went from bouncing, to rubbing and grinding her flanks and nethers into Celestia's face and body. Celestia strangely enough was actually trying to lick up into her folds.
"BUT WHY!?! Why are you liking this sister?" Luna asked calming down some as she lifted up her flanks to let Celestia speak.
"I'm going to be honest with you Lulu, at first I wasn't enjoying it but now, I'm loving it. Your flanks are just soo bouncy, soft and they smell really nice, almost like fresh blueberries. In truth, I was actually urging you out of your shell just so I could have some fun with you, i'm definitely not disappointed now." Said Celestia with a massive blush on her face.
"So now what?" Asked Luna as she didn't expect this outcome at all.
"Let's have some fun Lulu!" Said Celestia as she was licking her lips salaciously. Then Celestia dug back into her sister's moist honeypot, lapping up as much of her bittersweet nectar flowing out of her leaking marehood as she possibly could.
"Ooh... Keep t-that up Tia. T-That feels good!" Luna said as her sister continued to feast on her love tunnel. "A little to the left, that's just great. GASP! YES! That's my g-spot! K-Keep licking me there Tia!" Commanded Luna with sharp breaths.
Celestia was very talented at this, that much Luna knew for sure. Luna was getting close, she needed this release so badly that it hurt. "YES! YES! Keep going, i-i'm almost there T-Tia! DRINK MY JUICES UP!" Luna was on the verge of climax now, her orgasm was going to be big and powerful, she could feel it. "YES! YES! YES! AHHHH!!!" Luna screamed as the orgasm shook her body like lightning, coursing all though her body. Her sexual juices have exploded all over Celestia, absolutely drenching her face in her discharge. Once she recovered from her blissful high, she said. "What do you wish to do with my flanks now Tia?" She asked partially knowing the answer and wondering what she would do too.
"Give me a taste of that delicious pucker sister, I can only imagine how tasty it must be." Celestia begged totally in love with her sister's mighty flanks.
"As thou wishes, enjoy my ponut!" Luna said as she felt Celestia's tongue enter her spongy pucker, thrusting in and out, moaning in bliss at the slightly bitter taste. Celestia was in heaven now. Kissing and tongue-fucking her sister's ponut. She never wanted their night together to end. "Maybe taking a leave wasn't such a bad idea after all Tia! Thank you for this night!" Luna said as celestia continued to make out with Luna's butt.