Sunny Side Up

by The Great Derpsby

Rating: mature
Tags: Twilight Sparkle, Anthro, My Little Pony: Friendship is Magic, Fetish, Romance, Porn, Sex, Princess Celestia
Length: 4524

Princesses Twilight Sparkle and Celestia of Equestria engage in a little butt-fun on the beach.

Twilight Sparkle and Princess Celestia haven't been an item for very long, but during a trip to Saddle Lake with only the two of them, Twilight finally gives in to the temptation. Celestia's body proves too alluring to resist, in particular, the royal backside. Not that the other princess actually minds...

Written for Nagiman, as part of the Summer Sin Celebration 2021. Art by ea657.

Contains Anthro, butt-worship, rimming, anal, alliterations, and gross misuse of a bottle of sunblock.

Published 2021-07-21 04:00:01 UTC
Last updated 2021-07-21 04:00:01 UTC

Scary Butt-Fun!

It wasn’t always that Princess Twilight Sparkle found herself visiting the beach with only one other companion, the two of them having the entire lovely Saddle Lake to themselves on a warm summer’s day. Usually, she would have a full set of six friends with her, sometimes more, sometimes only some of them, but going only with one other pony was unusual.

As she peered out to the gentle blue waves stretching out before her—or rather, the one currently gliding through them—she found that she didn’t mind. Not at the moment. Not with an occasion like this. Twilight Sparkle pulled her legs close to her until her chin rested on her knees and concentrated on her fellow princess. Her former mentor. Princess Celestia of Equestria, Sol Invictus, Keeper of the Sun. And hottest mare around, in her own, unbiased opinion.

Their mutual confession of romantic attraction, secret from anypony else, just a few weeks before, had nothing to do with it either.

“You’re sure you don’t want to join me?” called Celestia to her with a small wave. “The water is just right. Come right in!”

Twilight shook her head wordlessly. She was just fine where she was, thank you very much. The view was plenty enjoyable to her. Then she saw the slightest frown on the other Alicorn’s face and knew she should have said something instead.

Celestia swam the last little bit until she could stand properly, getting to her hooves to rise out from the water. Twilight experienced a flash of regret, because that came with the perfect curve of the older princess’ backside submerging. Of course, it also meant the rest of her came into proper view again, so things evened out. Celestia lashed her rainbow tail as she walked onto the beach, shaking the water from it, and Twilight’s own tail twitched like it felt an echo. Wet as it was, Celestia’s mane hung straight instead of flowing in ethereal breezes of unseen power, giving it a look like one of Cloudsdale’s rainbow fontains. It clung to her, even as she unceremoniously wrung it out between two hands in a move that would’ve probably sent her Canterlot advisors into paroxysms. Below that mane…

Well. It wasn’t any surprise why Celestia’s full, feminine form established itself as the epitome of equine beauty. The bright red bikini she’d chosen for the occasion did very little to hide her body, parts of the princess bouncing with every step she took. There was a lot of her to bounce, too, despite her carrying hardly an ounce of fat anywhere on her where it wasn’t appreciated. Her own bathing suit, a magenta one-piece affair, couldn’t compare in the slightest, but that was okay. Twilight hurried to tear her eyes up to meet the slightly disappointed pink orbs of her mentor, only one of which was visible, as per usual. There was a note of reproach in Celestia’s words as she spoke.

“Twilight. When I invited you to this, I’d hoped you would come a little bit out of your shell. We have the entire beach just for us.. Yet you haven’t even opened up a book to read, let alone swam a bit. All you’ve been doing is sit there.” Celestia lowered herself into a squat, probably to bring herself close to eye-level with the younger princess, but only managing to push her sizable bosom more or less in her face. Twilight found herself face to face with two white-coated mounds barely held in place by a thin covering of fabric, stretched to its utmost in a valiant attempt to contain the royal bust. “Is something the matter? Are you not feeling well?”

“No, everything’s okay, princess,” Twilight answered. “Thank you for inviting me.” She managed a smile, too. A smile the older Alicorn joined in with a small laugh and a shake of her head.

“You don’t need to call me that anymore, Twilight. I’ve told you this. I’ve told you this a lot, I believe.” She paused for a moment, apparently thinking. Then Celestia stretched her arms up, torturing her top even more, before she lay down on her belly, next to Twilight, on the beach towels they’d prepared just for that. Her tail lazily swung about once, twice, and Twilight had the sudden impression of an immense white cat. The movement did draw Twilight’s eyes to what was right beneath that tail next.

She swallowed. Celestia’s bikini bottom had ridden up. The thin red lines were barely an excuse for a cover, and nowhere capable of keeping Equestria’s Diarch decent. They vanished right into the clefts of Celestia’s asscheeks, leaving absolutely nothing to the imagination. The last red shimmer of sunset over the snow-covered mountains of Yakyakistan.

Twilight was pulled from her reverie when a bottle of sunblock floated into her line of sight, carried in Celestia’s golden magic. “Would you be a dear,” Celestia said, face turned away from her, “and rub some of it on my back?”

Twilight took the bottle, but frowned. “You need sunblock?” she couldn’t help blurting out.

Celestia seemed to think for a moment, shrugged pristine shoulders, and answered in her motherly melodious way: “I do not, but I like the way it feels. It’s quite refreshing. And it helps get into the proper mood. Isn’t this what friends do at the beach, Princess Twilight?” The last few words held a tone of amusement.

“I… I suppose so.” Yet Twilight didn’t move. She leaned a little to the side to regain a better view of the glory that was Celestia’s behind. She wondered if her foreponies had written odes to these wondrous twin globes. She had her own little collection of poems dedicated to Celestia’s derriere. Nevermind the ring of muscle nestled at the base of her tail… the outlines of which were, due to how the fabric of bottom-turned-string bunched up, clearly visible.

“Twilight?”

Again, that voice. Beckoning her, though not as much as that ass before her was. Like in a trance, Twilight Sparkle lit up her horn, using her magic to pull down on the crimson barrier keeping her fully from her prize. She trusted her magic enough to rid herself of that obstacle, but touching the princess—the other princess, she corrected herself—she wanted to do that with her own hands. Even if they trembled the closer they came to making contact with those glorious royal cheeks. As she slowly pulled down Celestia’s bikini, the other Alicorn tensed momentarily. She could see that when that white-coated ass clenched for just a moment, soon to quiver slightly and relax again. Celestia had not said a word yet.

Finally, Twilight’s fingers brushed the fine hairs of Celestia’s behind. As she suspected, the sensation was velvety-soft; she increased the pressure ever so slightly, and those buttocks proved to be giving as well, feeling absolutely flawless in her hands with even a tiny squeeze. Twilight’s thumbs sought to go further in. She stroked and rubbed a backside that could only be called divine, then gently parted the heavenly mounds to fully reveal what probably no other living pony had seen. Twilight stared, breathing deeply and making note of how miniscule shudders rippled across the meat and flesh in her hands. Celestia’s pucked stared back at her, still glistening a little from her swim, oh-so invitingly. She was like in a dream. It didn’t seem real. Twilight’s body moved before she could think. Bringing her muzzle in close. Very close. Very, very close. Before long, she realised what she was about to do, her lips pursing a little. The kiss was gentle, loving, Twilight’s eyes falling halfway closed. She let her mouth love the ring of muscles; ethereal rainbow hairs tickled her nose. When she broke the kiss after what felt like a lifetime, it was with a wet smacking sound. And as she did, she felt more than she heard Celestia’s breath hitch.

The elder princess was looking over her shoulder now. She’d turned her swan-like neck around to peer at Twilight Sparkle’s face out of a wide, pink eye. She looked surprised. She hadn’t moved otherwise. Her mouth opened, closed, then opened again. “Twilight..?”

Twilight’s throat felt dry, despite the moist kiss she’d just landed on her sovereign’s anal ring. She worked to swallow. She forced her muzzle open to give the princess, the other princess, an answer. Words tumbled out without passing any significant filter in her brain. “Er, u-um… I—I was just following protocol! It’s said in Marechiavelli’s The Princess that upon a royal audience the noble of lesser standing is required to kiss the ring of her liege lord! So… so I did. Kiss your ring.”

She plastered a fake smile on her face.

There was a tense moment of silence. Twilight felt a singular drop of sweat run down the side of her face. It tickled her coat. She barely resisted the urge to flick her ear in irritation.

Then, Celestia’s mouth scrunched up. A snort escaped from her. And then she broke into a full-bodied laughter that sent her shoulders shaking. Twilight wanted to relax but her body was strangely frozen. So she sat there with her rictus grin while Celestia chortled.

“Oh my stars, Twilight! That,” Celestia said between peals of laughter and gasps for air, “that was horrible! Oh, oh I wish Luna had been here! I would have loved to see her face!” As she settled down, Celestia shook her head but she still grinned with mirth. “She probably wouldn’t know whether to kiss you or smack you upside the head for that. She knew Marechiavelli much better than I. Though, all things considered, she probably would be more inclined to go with a good smack, seeing as just how close you come to making mouth-love to her big sister’s asshole…”

Twilight twitched at hearing such vulgarity from Celestia. She also shrank into herself, unable to meet Celestia’s gaze. “S-sorry. It... was just too tempting...”

“The kiss, or the wordplay?” Celestia asked, rolling onto her side. Which sadly meant she’d turned her ass away from Twilight.

“Um, y-yes?”

Another snort. Celestia leaned her head against a raised palm, looking overall quite amused. “Well! Now I feel bad for reprimanding those students of mine who called you an ‘asskisser’ behind your back.”

“Sorry,” Twilight repeated her apology. When the rest of Celestia’s words hit her, she frowned hard. “Wait. Who called me what now?”

But Celestia waved it off. “No, don’t apologise again. It’s fine. As for those comments, it was a long time ago. And it was still unfair back then. Please don’t hold it against anypony, just let an old mare have some fun with it for now.”

Celestia paused. Twilight felt herself studied, and she involuntarily tried to straighten her back and fix her pose under the scrutiny. It was an old reflex, one hard to shake. “Speaking of having fun, Twilight. I didn’t mind what you did. It was just a little… sudden. I’m not used to having such intimate attention directed at my tail-hole.”

“And here I thought you had to deal with lots of ass-kissers,” Twilight mumbled before she could stop herself. Celestia absorbed her comment with a raised brow, followed by a graceful shrug.

“There’s more decorum involved in that particular kind, I’m afraid. More formality. I can always assume it’s more personal with you, Twilight Sparkle. So if you want… you can go for it again. It was actually quite pleasant.”

With that, she rolled onto her stomach again. Celestia’s long, wavy tail flagged right up this time, a raunchy display if Twilight had ever seen one. Her own pulse quickened, while her inner self whined with need. The object of her desires, subject of many long, sleepless nights, was so close. All for the taking. Her longing gaze inexorably dropped right down to that perfect ring of muscle, now a tiny bit shinier from Twilight’s own lips’ embrace. She couldn’t resist.

She was almost worshipful when she took hold of Celestia's buttocks once more. They were far too—what did the colts call it these days? Thicc?—to fit into her hands at all. Her purple fingers, as soon as she pressed down on all that pristine ass-flesh, very nearly vanished as Celestia’s cheeks spilled out in between them. In pure awe, Twilight pressed a reverent kiss to the right one. And a kiss to the left one. She was rewarded with a quiet sigh of contentment from the other princess, on top of her own pleasure. It just seemed so… so right, to praise these pictures of pony posterior perfection with her pursed, puckered lips. And oh, the center, of course. She could not forget about that…

Twilight brought her muzzle in close once again. She could feel her breath play over Celestia’s tail hair. The tip of her nose nearly touched that pucker, not much more than an inch or so of air between them. That would soon change, she thought. Twilight licked her lips, they’d become a little dry again. Now that she was ready, she took aim, moved in for the kill, so to speak, slowly but surely. And when she made full mouth-on-anus contact for the second time, she slowly, carefully, let her tongue roam out from her maw. Right inside the white Alicorn’s asshole, the owner of which reacted with a breathy gasp and a shudder.

Other ponies might have thought what Twilight was currently doing would be icky, or taste horrible, or any number of things. But, no. She had nothing to worry about. Celestia was well clean. Her bath had seen to that, nevermind an impeccable sense of personal hygiene coupled enough ambient magic in her, suffusing her, that an entire squad of Unicorn beauticians could’ve used to work on hundreds of customers. No, the only thing Twilight had to fear was to put up a disappointing performance.

Her tongue found itself engulfed by the warm, wet folds of Celestia’s anus. An irrational thought came to Twilight’s mind, how part of her expected the Day Princess’ asshole to be scorching hot, but it wasn’t. It was comfortably warm. Remarkably so, in fact. Something Twilight’s studious mind filed away for later reflection. Perhaps another side-effect of Celestia’s inherent Alicorn magic..? It was like her tongue was made to go up Celestia’s bum… and now that that thought had popped up, Twilight was fairly certain she would never get rid of it.

Twilight concentrated on the taste of it. It was—slightly bitter, but also spicy, in a good way. She curled her tongue upwards inside Celestia’s insides, well teasing the older mare. The effect was apparent when Celestia gasped again and moaned and moved her legs to spread them more, giving Twilight more access. Emboldened, Twilight wiggled her tongue next, curled it the other way, moved away from the anus in front of her enough so she could trace the outer layer with the very tip to give it another moist sheen. Meanwhile, Celestia had gripped the towel beneath her, hard enough to let her knuckles stand out from her fur.

“T-Twilight!” the other princess groaned. “Twilight, please!”

“D’yough wan me t’stoph?” Twilight asked. Her words came out muffled from in between Celestia’s cleft.

“No! Keep—keep going!”

So she did. Her wet tongue graced Celestia’s anal ring more in a series of sweet caresses. She was giving her little touches on her anus with the tip, once around the entire ring. When she’d arrived back at the start, she gave this asshole a long, slurping lick from top to bottom, thoroughly pleased with the weird little choking sound her mentor made. Twilight took the opportunity to plunge her tongue right back into the princess’s pucker. It went in deep and straight, before Twilight retracted it, counted to three, and thrust it back inside. She fell into a short pattern then and there, tongue-fucking Celestia’s anus while the bigger, older, more dignified and overall more incredible in every way Alicorn writhed and bit into the towel to keep from crying out. Twilight pulled back, panting, watching Celestia’s big, round ass wobble right in her face.

She was close, Twilight could tell. Or thought she could tell. She at least had a hunch. She hoped her hunch proved correct. She looked for something more, something to add, something to push Celestia over the edge properly. Her gaze swept over their little camping site; they hadn’t brought much with them, not planning on staying there for the night. Was there something she could use?! Then she found the answer to her conundrum: The abandoned bottle of sunblock. Twilight’s magic picked it up, she gave it a quick wipe, inspected it. It was smooth and just a little curved. Yes… it would do nicely.

“Princess Celestia?” she rasped. Twilight Sparkle’s voice was raw. She’d worked her mouth and tongue hard just now, and the cocktail of lust and sheer perversion of it all didn’t help. “Do you… trust me?” She sought Celestia’s eyes. Celestia in turn peered to her, and in that pink orb, Twilight saw a reflection of her own desires.

“Yes, Twilight. I do. I want to try it.”

Without another thought, Twilight brought the bottle to her muzzle. She licked its surface, getting it wet and slippery; no doubt she’d left Celestia’s backside plenty lubricated with spittle already, and Alicorn toughness would do its part, but it still wouldn’t hurt to make sure. And it was sexy too, she noted to herself, wrapping her lips around it lovingly, swirling her tongue about it, feeling her own tail twitch as Celestia watched her play with and tease this lifeless item so. Knowing it would be going up her ass very soon!

When she was sure the thing was slippery enough, Twilight lined it up with her prize. The tip of the bottle bumped against Celestia’s asshole. Celestia inhaled sharply, Twilight could see her forcing herself to relax, her shoulders smoothing out, nods of her head, whether to Twilight, to herself, or both. Twilight took it to mean she was ready. Exerting a little more pressure, allowed the slick surface of the bottle to glide in between the ring of muscle. There was a little resistance, but it smoothed out soon. Celestia was breathing deeply and evenly now. More of the bottle vanished up Celestia arse, Twilight pushing now with both a finger and the aid of some magic. A grunt made her ears prick up.

“Oh, oh g-gosh!”

Twilight halted her advance. “What is it, Princess Celestia?”

Celestia’s head dropped on one cheek. Her nostrils were flaring with her breath. “I’ve never felt anything like this, Twilight. I’ve never tried anything… back there. I feel so full.”

“Do you want me to stop?”

“No.”

Twilight’s heart hammered away in her chest. This was so much more than she’d imagined they would be doing today! She was bold! She was insane! She really, really wanted to see that bottle go up Celestia’s ass to the hilt!

So she kept pushing.

Celestia’s back suddenly arched. Almost like she was about to get up, but she only briefly lifted her upper body off of the ground, legs still spread wide, and Twilight saw her grope her own breast with one hand, pawing at her own nipple before she dropped back down bonelessly. Celestia even let out a small whinny! There wasn’t much more bottle to go. It seemed to move in Twilight’s shaking fingers; Celestia’s anal muscles working around the unrelenting, solid object making its way inside her ass.

“Twilight,” Celestia panted. “Twilight! Twilight!”

“Yes?”

“Please pump it!” White ears swiveled in Twilight’s direction. “Please fuck my ass with it!”

Just the right call, Twilight thought, because only a tiny bit of the bottle still protruded from the princess pony’s plot. Twilight fingered the now almost room temperature rim of the bottle, but it was with magic that she decided to pull on it again. Her starfield took hold of it once more, and with torturously slow motion, she reversed the bottle’s descend down Celestia’s anal cavern. There was another moment of resistance, another harsh shudder from the other princess, another moan from Celestia that made Twilight’s throat dry and her heart flutter and her own pussy embarrassingly moist. And even though Celestia was wordlessly egging her on, Twilight kept the same steady tempo, quite literally drawing the sensation out for her sovereign. That feeling of the thick, hard phallic shape slowly vacating her ass, outside of Celestia’s direct control. Moving at a snail’s pace. Celestia grunted hard and pressed down and her buttocks flexed under Twilight’s ministations, but still the purple princess kept on pulling, silently relishing the lewd little squelching sounds coming from the royal asshole.

Halfway out, she changed direction again. A bit faster this time. It wasn’t quite hurried but it was decisive! A loooong, drawn-out thrust of the bottle brought Celestia’s back up like a cat’s once more, soon to plop back to the ground. She did raise her ass to meet Twilight’s intrusion, however, and that very nearly made the younger princess come on the spot. Those creamy-white asscheeks bobbed enticingly and Celestia’s multicoloured tail wrapped loosely around Twilight Sparkle’s wrist, almost as if Celestia was trying to pull her right in. Was that a silent request to do it harder? Twilight would oblige!

So she sped up more. Pushing the bottle nearly to the hilt in between Celestia’s buttocks, marvelling at the way it parted those two rounds and the princess’s anus, making wet little sounds from the moisture keeping everything slippery. Twilight built up a steady rhythm in her anal conquest of Princess Celestia. And by Princess Celestia, she meant Princess Celestia’s amazing ass. Who seemed to try to crawl backwards, in an attempt to get more of the steadily assfucking phallic shape up her bum, while also not actually moving. The result was lots of tiny movements where muscles worked without any discernible result.

“I’m, ah! I’m close! I’m close!” A low moan, a squeeze down on the bottle and a flick of Celestia’s tail on Twilight’s wrist. Another thrust in, and she was tapping the ground almost like one of those weird wrestling shows Fluttershy would never admit to loving. Was Celestia tapping out?!

“Please, Twilight! P-HMM-please, please, let me c-c-come!”

Oh. Yeah, she could do that. Twilight Sparkle’s feverish attention returned to the makeshift buttplug. A dozen spells whirled through her mind. Eventually, her choice fell on a rather simple one. Very simple, in fact. There had been a time when Twilight had wondered why this spell was in so many books but seldom openly talked about. Twilight waited until the next thrust brought their impromptu sex toy once more as deep as it would go, then she kept it there. She concentrated until a mote of magic danced in the air before her eyes and, with a casual flick of her horn, launched it at her target.

The bottle immediately began vibrating. It also made a rather lewd buzzing sound, a muted ‘vvvrrrrrrrr’. Muted by Celestia’s generous hindquarters. The effect of this new development on said princess was also immediate.

Celestia’s head shot up. Her mouth gaped open, but no words came out, only a series of grunts and panting. Her entire body seized up, her eyes rolled back in her head, her wings flared out like she was about to take off—there was a wet splash further down. A squirt of royal Alicorn pussyjuice. And then… she crumpled.

Twilight saw Celestia just flop down. It was like she didn’t have a bone in her body anymore. Not an ounce of strength. Her majestic, aetherial mane stuck to her head, slick with sweat. It was still moving, but now the effect looked more like some invisible buttler trying to wipe her face. She was breathing deeply, judging from the rise and fall of her shoulders. Twilight let all of her magics fade. And that in turn meant Twilight could watch the well-used bottle of sunblock slowly but surely slide out of Celestia asshole in a manner most undignified. It made a little ‘pop’ when it came free.

Twilight swallowed down her apprehension. It took a little courage, but she managed. “Princess Celestia? Are… you okay?”

“I am most okay, Twilight Sparkle,” said the Sun Monarch. Without turning her head. Her chin still rested on the ground, in fact. “Most satisfied, even. I’ve always known you were a very resourceful student of magic. I hadn’t seen that spell in action before… or felt it.”

“Ah, um, thank you, Princess Celestia! First time I used it.” On anypony else, Twilight quietly added. With a groan of effort, the other Alicorn raised her neck and faced Twilight out of one eye. Her smile was not the regular beatific affair, but something altogether more… personal.

“And now that you’ve done this for me, it would only be fair if I returned the favour somehow. This day shouldn’t just be about me, Twilight. Let me do something for you in return. What would you like?”

Twilight felt strangely modest, all of a sudden. With the older, greater, wiser, more powerful, and in every conceivable way more prettierer—she was sure Rainbow Dash told her that was a word at some point—Alicorn’s ailment all anally alleviated, Twilight Sparkle felt that she had accomplished everything she desired, and more. To ask anything of Celestia in return, other than her affection, seemed almost blasphemous to her. No, Twilight was content!

“There’s no need for any, um, any of that, princess,” Twilight said. She knew she sounded bashful. She also knew she must’ve had a blush on her. She smiled at both, serenely, and at the silly image she must have made for her audience of one. Looking out at the sparkling blue lake, a warm breeze in her mane, she decided the day was perfect as it was. “I’m just happy I could give you what you wanted. That’s more than enough for me. I don’t need anymooAAAH!”

One moment to the next, Twilight had the ground in her face. She spat out sand, briefly wondering what had happened. She was lying down? She looked back over her shoulder. Princess Celestia’s horn was glowing. She probably had used her magic to pull Twilight’s legs away from under her. She, Twilight, had a very good view of that horn, because the head it was attached to sat embedded in between Twilight’s bathing suit-covered crack, which also kept her tail pinned down to her. A predatory smile flashed across Princess Celestia’s long white face, two rows of teeth equally perfectly pristine.

“Oh, I don’t think so, Twilight Sparkle,” Celestia purr-growled in a way that made Twilight’s ears snap to her skull and her knees weak. “I do think I should repay you for your efforts. I think I already have a few ideas how I could do so. I think I will enjoy testing those ideas. And I know, for the next few hours, this cute, purple, star-covered butt belongs to me.”

Twilight could only whimper.