The next day, aside from Rarity, Twilight and the girls were all gathered at Sunset’s house getting ready for a bachelorette party for Rarity. While Pinkie baked, the rest decorated the room with heart-shaped balloons and pictures of each of their rumps on the walls, along with setting up the long table.

“I still can't believe we're doing this.” The sun themed girl admitted while putting up a banner labeled “Butts 4 Life”.

“Well, this is what Rarity wanted to do before getting hitched to her own behind, which ain't the weirdest sentence I ever said.” Applejack replied while putting out some party favors and setting the plates.

“True but this is Rarity's idea, and who are we to judge someone's affection to their own butt?” The science girl commented as put up pictures of Rarity's butt.

“She's got you there AJ.” Rainbow Dash added while Fluttershy painted her butt. She then sat on a canvas, making a print of her butt.

“But it is a bit… odd, marrying your own butt and all.” Fluttershy commented while she glanced down at her rear.

“Yeah, but like Twilight said, who are we to judge on who, and what people marry?” Sunset pointed out.

The girls all voiced their agreements after hearing what Sunset said.

“Fair enough although I think we should all thank a certain rainbow haired gal for helping Rarity fall for all things rear related.” Applejack agreed while looking at Rainbow Dash along with the others.

“Hey, it surprised me too! I always thought she’d be into boring stuff like fashion and all that junk. Now she’s butt obsessed perv?” Rainbow remarked. She chuckled to herself. “Then again, who am I to talk?”

Twilight adjusted her glasses again. “It is a rather fascinating change in personality.”

“Maybe that part of her was always there, it just needed a spark to light the flame.” Sunset theorized.

“That could be, I have heard that even girls like Rarity have a lustful side to them without even knowing they have one.” Twilight added, as she looked at her own butt. She then smacked it, creating a nice sound and making Twilight moan with pleasure.

Sunset giggles. “Techie girls too, it would seem,” she commented.

“Hey, what about me? I was the one who got Rarity to be into butt stuff.” Rainbow reminded them.

“Good point, you were the one who started it, all by mooning some people.” Twilight said.

“Do you think the same thing would have happened if one of us did it instead of Rainbow Dash? Would it still have the same effect?” Fluttershy wondered.

”It could be a possibility, shame we can’t test that theory.” Twilight said.

Pinkie slid over, flour in her hair, and hip bumped Fluttershy. “Well, you know what I think? I think Rarity’s really to have a butt that loves her so much! That’s a really lucky butt!”

“Hmm, yeah, she is lucky. Her and her butt both.” Sci-Twi agreed.

“Yeah, I’m happy for ‘em, both of ‘em.” Applejack added, while she caressed her butt. “And I know her rump’s happy too.”

The other girls all reach around and start rubbing the round orbs that were their derrière’s affectionately. Even if they were all technically balls of flesh, it was like they could feel warm and happy emotions radiating from them, almost like they were alive. The girls all smiled at their asses warmly before Pinkie’s eyes widened.

“Hey, I just realized something, we never got our butts measured after the first time, should we get them measured!” Pinkie said.

“Oh yeah…!” Applejack realized.

“I suppose we can measure them again, I never got a chance to measure Sunset's butt.” Sci-Twi replied.

“Well, you’re free to try if you want.” Sunset offered as she fiddled with and dropped her skirt and panties. She bent over and looked back towards Twilight. “You got any measuring tape?”

“I got some!” Pinkie said as she pulled a measuring tape from her hair and gave it to Twilight.

“Thanks now let's begin.” Twilight declared. She eyed Sunset's butt and saw how large it was, though it was not as large as Rarity's own caboose.

“Well if we're all going skirt-less…” Rainbow started as she tugged on her skirt and let it fall to her ankles before stepping out of them.

“Oh yeah, I almost forgot about the ‘dress code’.” Applejack chuckled before stripping off her bottom clothes.

“Yay! Half-nakie time!” Pinkie cheered as she practically ripped her lower garments off in one quick motion. Fluttershy did the same too and blushed as she tried hard not to cover herself.

“Well, I don’t want to be the only one…” Twilight admitted before reaching around to drop her skirt, exposing her bare behind while she wraps the measuring tape around Sunset’s hips and gets her face close to her cheeks.

"So Twi, what's the verdict? How big is the junk in my trunk?" Sunset asked as she fidgeted a little.

“Hmm, well… while we know Rainbow Dash’s is thirty-three inches and Rarity’s is thirty-six, or rather eighty-three and ninety centimeters, Sunset’s hips and butt are thirty-one and a half inches/eighty centimeters.” Twilight declared.

"Wowie, that's four inches smaller than Rarity's booty!” Pinkie remarked while she jiggled her own booty while juggling some eggs.

“Fluttershy’s next.” Twilight said as she quickly wrote down Sunset’s measurements into her notebook before going over to the shy girl.

“Um… me?” Fluttershy spoke up, surprised and nervous. She let out a yelp as Twilight forced her to bend over while she wrapped measuring tape around her hips.

“Seventy centimeters and twenty-seven inches on the mark.” The sciency girl announced before writing it down.

“Woah, Fluttershy's ass shrunk?” Rainbow commented.

“I… have been dieting a lot recently…” Fluttershy sheepishly admitted. “Though I didn’t think it would get that smaller…”

“Don’t worry Fluttershy! My super sweet and fat filled cupcakes will add some extra fat to those yellow cheeks in no time!” Pinkie promised her before she goes over, rapidly mixes the cupcake batter, then pours it into a container and uses cookie cutters on them before quickly putting the tray they’re on in the oven. “Just as soon as they’re out of the oven! I’m hoping they’ll be as butt-shaped as I wanted. You know, because it’s a butt-themed bachelor party for a girl and her butt! Ooh, so romantic! An even better romance than that tragic vampire romance book series that I can’t remember!”

“Now hang on, while sweets and cupcakes can make a butt big, I find that exercise, eating right, and occasionally carb loading, can make a rear look big and look good.” Rainbow replied as she smacked her own butt making the fat on it jiggle like jello.

“Got that right, RD. Working hard outdoors has made my glutes hard as rocks!” Applejack stated proudly as she patted her solid butt cheeks, which Twilight quickly started to measure.

“Applejack measures in at about eighty-three centimeters and thirty-two inches.” Twilight informed them. “I think you also have good genes to thank for these as well.”

“Yep, we apples do show our rear ends some good old lovin’.” The farm girl once again said with pride.

“Hey! You can’t take credit for having good genes!” Rainbow Dash argued with red cheeks.

Twilight then quickly measured Pinkie’s rump next, the measuring tape sunk into Pinkie’s dough sacks a little and made her giggle the whole time. “And Pinkie comes the closest to Rarity’s butt size, measuring in at thirty-three inches as well.” The science girl commented as she wrote down the measurements.

“Yay!” Pinkie cheered as she waved her rear in everybody’s face. “Told you sweets are the best for good buns!”

“Now let’s see how big Twilight is.” Sunset smirked as she took the measuring tape from the bespectacled girl.

“Wha…? Me?” Twilight commented in surprise before squealing as Sunset measured her next.

“Our world’s Twilight measures in at eighty-two centimeters and thirty-two inches, very nice.” The fiery haired girl complemented.

“And how big is the junk that the other Twilight has in her trunk?” Applejack asked.

“Well since they are the same, they could have the same sized butts.” Sunset theorized.

“P-Probably.” Twilight agreed.

“So um, when is Rarity showing up?” Fluttershy asked as started snacking on some treats that Pinkie gave her, ones that were high in fat.

“She said she’d be here soon.” Twilight answered.

“That gal’s probably gonna make some sort of grand entrance.” Applejack commented.

"You think so?" Rainbow asked.

“Of course she is, remember the slumber party we had at Trixie's place?” Applejack asked.

Everyone looked up as they started to have a flashback.

---

The girls, except Rarity, were all in Trixie's room having bottomless fun with Pinkie and Twilight pressing their butts against each other, trying to push the other one off the bed when the door slammed open after Rarity bumped it real hard with her bum as. She looked back and raised her arms with a smile.

“Tada!” she announced.

The farm girl clicked tongue. “Hey, Rarity." Applejack replied. “Hey, Rarity’s butt.”

“Hello to you too, Applejack.” The fashionista said while her bum vibrated. “And my butt says ‘hello’ as well.”

“You can tell what it’s saying? Cool!” Pinkie Pie commented before being butt bumped off the bed by Twilight.

“But of course, it is my butt after all.” Rarity pointed out as she rubbed it affectionately.

"Do you need some ice for your butt?" Fluttershy asked in concern, noticing a faint redness in the cheeks.

“Nope, my derriere is as strong as they come!” Rarity declared dynamically.

"You do, don't you?” Rainbow flatly asked.

“....Maybe some.” Rarity meekly replied, wincing as she held both her cheeks.

---

Shortly after everyone returns to the present, they hear a knocking at the door.

“Well, well, well, I wonder who that could be?” Applejack asked, knowingly.

“I'll check.” Fluttershy said as she went over and looked through the mail slot, only to see a certain white derriere pointed in her direction. Fluttershy squealed as she fell back on her bare booty.

“Who is it?” Rainbow asked.

“B-b-b-b-butt…” Fluttershy stuttered blushing red.

“Butt? What does that mean?” Rainbow asked, as Applejack went over to see the derriere.

“Woah nelly!” She cried in surprise as Rainbow opened the door to reveal a bottomless Rarity and Trixie both giggling impishly.

“Tada!” They both said.

Applejack sighed. “I knew they’d make a dramatic entrance…”

“Wow! Rarity’s butt answered the door! It’s becoming more alive every day!” Pinkie exclaimed in amazement.

“Just be glad it didn't fart or burp.” Rainbow Dash remarked.

“Rainbow Dash! I may be a butt connoisseur, but even I draw the line at passing gas in public.” Rarity replied.

“Oh relax Rares, farting is natural but yeah I don't do it in public, maybe in private, or in the pool.” The farm girl admitted.

“Applejack! TMI!” Rarity exclaimed, red faced.

“Sorry.” Applejack apologized.

“I don't get it, you're into so much butt stuff but why is farting a big deal?” Rainbow asked.

"Well if you must know I for one am not a fan of… passing gas, sure I may like spanking, mooning, pressing my rear on windows, but farting is where I cross the line!" Rarity exclaimed.

“Really? That's where you draw the line?” The country girl asked.

“Everyone has their limits.” Sunset reasoned.

“Exactly.” Twilight nodded as Trixie closed the door.

"Well, with that said, let's get this bachelorette party started!" Trixie declared while everyone cheered in response.

---

Later on, the girls are all having bottomless fun inside Sunset’s house, with Rainbow over Applejack's lap and getting spanked by her, Trixie and Rarity pressing their butts together as they try to push each other over, Twilight and Sunset hip bumping as they dance to a stuffy old song about buttocks, Pinkie watching her butt shaped cupcakes get heated up in the oven, and Fluttershy shaking her own butt impishly.

“Yay…” Fluttershy exclaimed softly.

*Smack*

*Smack*

*Smack*

“Ooh! Yeah! That’s it! Harder AJ!” Rainbow Dash exclaimed.

“Yes, ma’am!” Applejack responded while increasing the speed and power of her spanks. Rainbow whooped and yelled with pleasure.

Trixie and Rarity pushed against each other as hard as they could, toughening and softening their butt cheeks as they tried to knock each other over with their bottoms. It was almost like they were two sumo wrestlers going at it.

“You realize that you can’t win, right?” Trixie questioned her bottom heavy rival/friend.

“I prefer to think that I can’t lose!” Rarity boasted, sweating just as much as Trixie was. Both of them grunted and groaned with effort as they pushed against each other, as well as bump butts repeatedly.

“You know at first I didn’t know what mooning was until I got to this world but now I do, and it is so- Oh!” Sunset started to say before she was cut off by something wet licking her butt cheek. She turned, looked down and saw it was Sci-Twi kneeling in front of her booty, kissing it.

“Hehehe, sorry, my bad I always wanted to kiss this booty ever since that group twerk we did back at Rarity’s place.” Sci-Twi replied as she nuzzled Sunset's ass.

“Heh, no worries Twi, if you wanna kiss these buns, then by all means, show them some love.” Sunset replied back as she shook her ass in front of the science girl enticing her even more as she began kissing Sunset’s booty.

Eventually, as Trixie thrusted her butt towards her, hard and fast, Rarity promptly moved her hips to the side and dodged it. Just as Trixie started to realize that she had missed, Rarity responded by hip bumping Trixie so hard that she fell right over.

Rarity smiled as she flipped her hair. “And that’s how it’s done,” she stated before rubbing her tush. “Such a good bottom. Yes, you are. Yes, you are.”

Trixie groaned as she raised her head. “Just be grateful that today’s your bachelorette party, otherwise the Great and Bootiful Trixie wouldn’t have been so easy on you,” she boasted.

“Oh, of course, darling. Of course.” Rarity nodded. She knew Trixie wanted to keep at least some of her dignity intact and felt she deserved that much. Besides, she had other things to do then argue about how and who won. After taking a cup and spoon, she gets everyone’s attention by tapping the cup with said spoon. “Ahem. Attention everyone! Before we all take a bite of the delicious butt cupcakes that Pinkie Pie has made, I’d like to say a few words before giving my beautiful derriere some, shall we say… recognition.”

“Recognition?” Sunset repeated in confusion.

Pinkie rapidly waved her raised her. “Ooh! Ooh! Ooh! Ooh! Can we all say some things too!”

“But of course, dear.” Rarity confirmed. “First of all, I just want to thank all of you for being here today to celebrate my last day as a free woman!”

“Of course.” Sunset nodded.

“We wouldn’t miss it.” Fluttershy added.

“Yeah, it ain’t every day we get to see our friend get married, especially when it’s to her own heinie.” Applejack remarked.

“Which is a bit unusual…” Twilight admitted.

“But also really cool!” Pinkie Pie piped up.

Rarity giggled. “Indeed. And I’d also like to especially thank you, Rainbow Dash,” she said to the naked rainbow haired girl now getting off Applejack’s lap.

“Me?” she responded in surprise.

“Yes! For opening my eyes to the beauty of buttocks, as well as unlocking my own perversions.” Rarity said while blushing.

Rainbow smirks with her hands on her hips. “My pleasure, Rares. Although I do have one question.”

“What’s that, dear?” Rarity inquired.

“When the whole ceremony thing starts, how are you gonna ‘kiss the bride’ when one of us gives the word?” Rainbow Dash questioned, which made the others start to wonder as well. Even Rarity began to realize that such a moment could be… tricky, to say the least. It made her wish she could stretch her neck out so that she can go around and give her rump a smooch, which she would happily do whenever.

“Hmm… well… I’m not sure…” Rarity confessed. “Oh, I wish there was a way…”

“I think I might have an idea.” Sci-Twi spoke up, making everyone turn to her.

“You do?” They all asked.

“I have been working on plans to create a portal generator. No big deal, just something to move things across my lab quicker.” Sci-Twi shrugged, treating the whole thing like it wasn’t a big deal. “It can’t open portals to other dimensions, but it can make a portal that Rarity could stick her rear into before another portal opens in front of her…”
“And my derriere would emerge from the other side?!” Rarity asked in excitement.

“In theory, yes.” Twilight confirmed.

“How soon can you build it?!” Rarity inquired, even more eagerly.

“It’ll take some time… maybe a week or two?” Sci-Twi shrugged.

“Then when it’s finished, that is the day we’ll have our wedding.” Rarity declared before rubbing her bottom. “You hear that, my sweet? Only a week or two to wait before we’re wed.”

Rarity’s butt seemed to vibrate on it’s own again, which made Rarity giggle before she turned to Twilight with eyes of adoration. “Oh, Twilight, I can’t thank you enough!”

Twilight adjusted her glasses with a smirk. “I can think of one way,” she said before turning around and sticking her bare ass out. “How about giving me a bump from the rump for old times sake, Rarity?”

“Ooh! Gladly!” Rarity practically squealed as she hurried closer to Twilight, spun around and began to bump rumps repeatedly. The two giggled while the flesh on their butts rippled with each bump.

Everyone was enraptured by the spectacle they were watching, until Pinkie’s eyes widened when he heard the sound of the oven buzzing.

“Ooh! The butt cupcakes are done!” she announced excitedly before zipping over and zipping back with a tray filled with butt shaped cupcakes in her oven mitt covered hands. “Dig in!”

“Ooh! Dibs on the biggest! Only the biggest for the Great and Bootiful Trixie!” The performer declared.

“It is still my bachelorette party, you know.” Rarity reminded her.

“Well, what if I have one after you? One even bigger and bootifuler.”

“You wouldn’t dare!”

“I just might!”

“Girls, girls, let’s not fight, this is a time for celebration, remember?” Twilight gently reminded them.

“Also, ‘bootifuler’ ain’t a word.” Applejack added.

“Fine…” The two half-naked girls sighed before they and each of the others took one of the butt cupcakes, which they all happily enjoyed. Hearts practically appeared in Pinkie’s eyes as she ate two at once.

“Um, Pinkie? How did you get these cupcakes to come out… butt shaped anyway?” Fluttershy inquired.

“Easy! I just used a heart shaped cookie cutter and gave the heart butt cheeks!” Pinkie confessed with a cute giggle.

“Funny that you’d say that, because in actuality the iconic Valentine’s heart shape isn’t actually based on the shape of a human heart, it’s actually the shape of a girl’s buttocks as she bends over.” Sci-Twi revealed, which stunned everyone.

“Wow… I’ve actually been dotting my I’s with little tushies!” Pinkie realized with joy.

“M-Me too…” Fluttershy added with rosy cheeks.

“As have I!” Rarity admitted proudly.

“Me three.” Sunset nodded.

“Guess I’d better start doing that.” Applejack remarked to herself.

“Totally!” Rainbow agreed.

Sunset looked around with a smile. “Guess it’s a good thing we put up a lot of hearts, huh?” she commented as she gazed at all the heart shaped balloons and the hearts on the “Butts 4 Life” banner before laughing along with the others.

And so the party continued on, with Pinkie even planning on baking cookies that represented their rumps with frosting that matched their skin colors, plus a wedding cake that would look exactly like Rarity’s derriere, right down to the last detail.

Next Chapter: Chapter 26 Estimated time remaining: 1 Hour, 39 Minutes