The price of insulting the royal sunbutt.

"Come now, dear sister. It's not that bad to look at. It isn't!" Luna said as she stared at her sister's massive and bouncy backside and lightly blushed at some of the admittedly lewd thoughts trying to claw their way into her mind. Luna didn't want to give off the feeling that she was being rude to her sister. And she didn't like to receive the sunbutt treatment, either.

"Are you sure, Lulu? Some of the things that my subjects were around me saying were very hurtful. I'm not fat. I'm pleasantly plump! Isn't that right, Luna?" Celestia asked with a hopeful answer. Celestia was just one of those ponies who were self-conscious about their weight and how others reacted. The long story said short; it was a very touchy subject for Celestia. Luna had to tread lightly on this subject. One mistake could be her last, especially regarding remarks about her older sister's weight.

"I promise you, Tia, there's nothing you need to worry about. Ponies will say natural things; you must take everything in stride and use it partially as room for improvement and as sticks and stones. They may break my bones, but names will never hurt me!" Stated Luna. "Now, let's go and get you something to drink. Maybe some herbal green tea might help you to feel better." Said Luna as she gestured for Celestia to leave her royal bedchambers while Luna followed suit.

"Yes, Lulu, I would like that very much. Thank you!" Said Celestia cheerfully as she began to walk to the front door of her bedchambers. That massive jiggly ass, though. It's unbelievably large at such a close range. Luna couldn't take her eyes off it. Every step Celestia made created a jiggle, a wobble, and a bounce. Her cheeks could easily weigh at least two hundred pounds together. All that cake she ate knew precisely where to go, that's for sure. Luna couldn't stop staring at her sister's massive plot.

"Something wrong, Lulu?" Celestia looked back at her and asked a trite concern for her sister. Luna either wasn't paying attention to where she was going or was deep in thought. But just then, she accidentally bumped into her sister's left asscheek, some of her snout and face getting pushed into the fat of her sister's asscheek before it bounced her body back as she sprawled across the carpeted marble floor.

"Oof Woah there! Wha- What happened? Gasp Oh no! I'm so sorry, Tia; I wasn't watching where I was going." Said Luna in a bid to defend herself, but deep down, she felt in the pit of her stomach that she knew she was now in a lot of trouble. Celestia's expression was anything but amused, and she glared very sternly at Luna.

"You're sorry, huh? You're just trying to butter me up, then hurt me just like everypony else did. How could you, Luna?" Asked Celestia, clearly upset that her sister had bounced off her flanks as if they were made of jello. Slowly taking steps towards Luna's sprawled out and slightly dazed form began to send chills down Luna's back. She knew very well that an angry Celestia was never a happy Celestia. And indeed, never one to be underestimated.

"No, wait, dear sister! Let me explain. It was an accident. I never meant to..." That was all she could say before Celestia spoke up.

"That's quite enough out of you, Luna. Being wounded by my loyal subjects was one thing, but my blood was. This cannot continue. I will see to it that you're punished." Said an angry Celestia. Luna knew that at this point, her sister was too angry to be reasoned with now, but she still tried to say something to defuse the situation.

"No, Tia, you're not thinking clearly! I never had the intention of insulting you. I swear this is all a huge misunderstanding. If you'd hear me out..." Luna said before she was cut off again by her livid sister.

"No! I'm not in the mood to hear excuses, Luna, and I think the most appropriate punishment for you to receive would be the royal sunbutt treatment. I'm sorry, Lulu, sniff, but you've left me with no other choice now." Celestia has had enough of other ponies hurting her. As far as she's concerned, any remarks, snide or otherwise, will be dealt with accordingly. Luna was about to be the first of many in a very long time to receive the sunbutt treatment. And Luna knew just how bad it was before when she witnessed it happen to somepony over three centuries ago. All because that pony had stolen her cake, smashing it right before her and calling her a white blubbery whale.

"T-Tia... Please don't do this to me. I-I said I was sorry." Luna was nearly on the verge of tears now. Celestia was getting closer to Luna's body. From where Luna was lying, she saw Celestia's great shadow swallow her up. Celestia turned around so that her massive flanks were facing Luna. "I'm serious, Tia. I never meant to cause you any harm. I implore that you please cease this." Pleaded Luna. But Celestia wasn't having any of it today.

"No, Luna! No, I won't cease this. I'm sick and tired of other ponies complaining about my weight. If ponies have such an odd fascination with my flanks, I suppose I should indulge them properly. Starting with you, Lulu!" Celestia declared as she began to lower her backside down onto Luna's upper body, pinning her to the ground and preventing her from escaping. "Everypony who dare insults my weight shall be punished! No ifs, ands or buts, no exceptions."

Luna tried in the last-ditch effort to raise her forelegs to hold out against Celestia's mighty asscheeks. This had about as much effect as expected from such intense weight. Luna was sweating from her struggle to keep her sister's flanks from squishing her into a pancake. Celestia's flanks were as wide and heavy as Luna had imagined. "P-Please dear sister, grunting I never meant any of w-what I have said to you! I beg of you, T-Tia, please have mercy on me." Cried Luna as she felt herself getting weaker due to the weight of Celestia's ass pressing her further into the ground.

"I did show some mercy at one point, but then I was called a white blubbery whale! Well, no more will I be tolerating this blatant disrespect towards me. I think it would be best to get your punishment over quickly so we can leave this room and into the lounge room for a relaxing cup of tea." Stated Celestia, dead set on what she wanted to do. "The more you resist, the more you'll draw this out, Lulu. You're merely delaying the inevitable here!" Stated Celestia.

"N-No! I will not fall prey to your f-fat flanks, Tia! I-I refuse to surrender to you!" It was as if time itself had slowed to a crawl for Luna. She would regret what she said.

"Gasp Luna!?! That is it! I'll give you a reason to call my flanks fat!" Celestia spat out angrily. Suddenly, Celestia's horn began to glow, and Celestis put a ring on Luna's horn. "Just for a little bit of insurance!" Added Celestia.

"Stomach grumbling Ooh... what I ate last night is not agreeing with me. Things might get a little breezy for you down there, Luna. I just thought it would be fair to let you know that!" Said Celestia as her ass was ready to swallow Luna's muzzle and face into its soft, warm, and soon-to-be stinky darkness.

"N-NO T-TIA NOOO!!! CRUNCH" Just like that, Celestia's ass squashed poor Luna's upper body. All that was heard was Luna's muffled screaming from underneath Celestia's massive flanks. Then Celestia decided to re-adjust herself so that Luna's head would sink deeper into her asscrack, and it did, agonizingly slow. Luna still struggled to lift her sister's ass off her face, but it was no use; Celestia was too heavy for Luna to lift.

Luna then resorted to bashing her hooves against her sister's asscheeks. But sadly, she may as well be pounding jello at that point. All that did for Luna besides make Celestia's ass jiggle all over her face was stir up the gurgling from within Celestia's bowels, which did not help Luna feel better.

"You're getting desperate for my flanks, huh? Do you want to smell my farts that badly, Lulu? You're an extraordinary sister sometimes, I swear." Celestia said as she grunted and blasted Luna with a ten-second, silent but deadly, ending with a hiss. The pungent smell of baked beans, broccoli, and rotten cheese forced Luna to redouble her efforts at escaping from her smelly tormentor.

This was, however, easier said than done as Celestia has had no intention of letting up on Luna's punishment yet. "So, Lulu, how do they smell? I bet that you can tell what I had to eat last night. It must be great down there, admiring your big sister in such a supportive way." Luna was now flailing her hindlegs helplessly as Celestia began to rub and grind her flanks on Luna's head more, rubbing her sweaty flank stink into Luna's face to remind her of this horrible night forever.

"Grunting and farting Ahh... That feels nice, letting out all that pressure. You're helping me out, Lulu. I can't thank you enough for this good deed. I was feeling itchy in my asscrack as of late. Mmm.... yeah, scratch that itches for me, Lulu." Celestia then began to lightly bounce on Luna's smothered and skunked head and face, making it even worse for the poor night Princess to endure much longer. Several nasty farts were ripped in rapid succession, assaulting Luna's nose. Celestia was forcing Luna to whine in defeat at the atrocious odor swamping her sense of smell, probably forever.

To Luna's absolute horror, her muzzle began to prod at something tight, spongy, and rotten. Her pucker? Oh no, this isn't going to end well at all for Luna. She felt the rumbling from being wedged so deep into Celestia's asscrack. Luna even felt her sister's pucker retract outwards every time she grunted, which only served to assault Luna's senses with more warm and stinky air. It was getting harder to breathe inside Celestia's disgusting ass. Her flanks completely covered Luna's entire head, face, and most of her mane.

"Ooh-oh my, My farts do smell bad. Don't worry, Luna. Your punishment is almost finished. Just a wee bit more." Stated Celestia. Celestia continued her butt barrage on Luna's poor nose. It was now making Luna's nose burn and go numb. Luna's struggles were getting weaker by the second. Luna knew what she would never do ever again was to insult her sister's weight.

"Hey there, Lulu, I can't feel your struggles anymore. It looks like you're finished with your punishment. I'd be lying if I said that I never enjoyed this." Celestia said as she slowly got up off of Luna's head, creating a disgusting Schlicking noise as she did this. Luna lay motionless, lightly breathing but otherwise knocked out cold from the torture. Her once bright and beautiful coat is now ruined with a thin layer of brown over her face. "Maybe this'll make you think next time before you insult me. Well, have a nice nap, Luna. See you when you wake up!" Celestia finished as she left her bedchambers to have that cup of tea.