Locked In

by Incandesca

Rating: mature
Tags: Anthro, Rarity (EqG), Porn, Fetish, Non-consensual, Equestria Girls, Sex, Sonata Dusk
Length: 3145

Nopony gives Sonata the predator's credit she deserves. She's a siren too, and Rarity's about to learn that lesson the long, hard way.

Nopony seems to give Sonata the predator's credit she deserves, but that's okay! She's a siren like her sisters. If she can't lure, she hunts.

And the next fishy on her little fuck list? None other than Canterlot High's resident primadonna.

Tags: Futa/Female, Non-con, Blackmail, Stalking, Photography/Video, Intercrural, Rough Sex, Humiliation, Impregnation, Incest (implied)

This was a story written for Tailsic. If you enjoy the read, consider getting a commission!

Published 2024-11-23 21:20:01 UTC
Last updated 2024-11-23 21:20:01 UTC

Flared Out

Her hands passed over the clothes, one after the other. "No. No. No. No. Too small, too flowy, too many buttons and... eugh! What is that positively dreadful collar seam! I never would have picked this one out if I'd noticed that... Ugh!"

Rarity grumbled. Putting the dress shirt back onto its hanger, she stacked it with the rest. Seven tops she'd gone through, three left, and with her luck she doubted those would be any more suitable.

Partly, she'd done this to herself. Fashionable sensibilities demanded a discerning palette - not to mention a discerning wallet. Unfortunately, she couldn't get a tailor every time she needed a new piece, and while she could do it herself...

Well, sometimes a girl got lazy. That was the nature of things.

Partly, however, her own body was to blame. Standing in the mirror, she cocked her head at her reflection, glowering down at her obscene breasts.

They bounced with every breath. They strained every top she squeezed it into. Blouses, sweaters, gowns, dresses, even that occasional t-shirt or sports bra when she felt in the mood for leisure or yoga. Her fat nips protruded like spigots, a wealth of milky white titflesh behind them and cleavage deep enough she'd lost things inside on more occasions than she'd be comfortable admitting.

The one day her sewing needles got lost was a day - and discomfort - she'd not soon forget.

She couldn't wait until the day her body stopped growing. Coming in for measurement adjustments every other month simply was not sustainable. Applejack had suggested she might look into binders, but ick. The fashion faux pas! Absolutely dreadful.

"Oh Rarity..." With an exhaustive exhale, she shut her eyes. Her ears twitched, hearing something slide and shuffle behind her, but she thought nothing of it. The click that followed was easily explainable, given the other patrons at this fine establishment. "Why couldn't you have been born with a normal chest? Like Twilight, or Rainbow Dash."

Okay, nix that last one, perhaps. Rainbow had a finely shaped bottom, but her bosoms were scarcely larger than A-cups. It wasn't that she had anything against flat chests, certainly ponies were into that, but she did want at least a little heft.

She hauled them up, the leaden weight pressing down on her fingers. Ready to try and continue the search, she opened her eyes with a sigh.

And screamed.

Or she might have, if a slender, powder blue arm hadn't wrapped around her throat.

"Hi Rarity!" Sonata's airy, giggly voice invaded her mind. "And I know why you were born with big fat bazongas! It's the same reason Ari has huge titties, too~"

Lilting, Sonata used her free hand to paw at Rarity's right breast. Only a thin, lacy red bra concealed her full bounty from view, and Sonata plucked it with tapered fingers and pointed nails, like she was threatening to cut it open. Rarity's muffled angry, fearful protests went unheard, then became a sharp gasp as Sonata found and tweaked a nipple.

"It's for me to molest! It makes Little 'Nata reaaaally happy~ Do you wanna see her?" Sonata leaned in, whispering daggers in her ear that made Rarity's heart falter. "I have a secret to tell you. She's already getting hard~"

Fight and flight kicked in at the same moment. She tried yanking herself from Sonata's grip, but the pressure on her porecelain throat was insane. She'd been grappled by AJ once or twice, tackled by Rainbow in Gym, or held back by Sunset before she did something stupid. For all their athleticism, it couldn't beat the ex-siren's frankly supernatural strength.

With strain and effort, Rarity managed to hiss out a reply. "Wh-what... are... you... doing?"

"Fucking you! Or, uhm, not fucking you yet, but I'm like, warming up to it! Want me to help you with those tops?" Raspberry eyes flicked to the remaining three.

Through a clenched throat, Rarity managed to spit her reply. "No."

"Awww." Rarity saw Sonata's face pout in the mirror. Her smile returned quickly enough, wider and toothier than before. "But that's okay! Ari likes to fight it too, but I always win in the end. And remember - if you scream?"

Sonata's eyes flashed wickedly. Releasing Rarity's tit, she slid a sleek black phone from her own generous bosom. Moments of tapping and swiping later, she brought up the screen to show her.

Rarity's eyes bulged.

She'd never seen herself naked before, in anything but a mirror or her own selfies. Now, she saw herself from so many angles, so many vantage points, in so many places.

Peeling sweaty nylon off after gym, from a hidden camera in her locker. Undressing in her room after school, through the blinds. Singing, washing in the shower through a cracked open door.

She even saw herself in bed. Dressed in lingerie, arching her back, moaning and thrusting her hips against her own palm as delicate pink petals throbbed sore and needy.

"How?" was all she could think to ask, the syllable slipping from her throat with a dry, rasping horror.

Sonata giggled, a sound like sharp, tinkling windchimes that chilled Rarity's blood. Of all the Dazzlings, she never expected the dumbest to be the most wicked.

"You're pretty hot, so I thought, like, hmmm. What if I stalk her, until I learn all her intricate, intimate behaviors and patterns before cornering her somewhere private and pounding her brains out! You're not the first though, teehee~"

Sonata zoomed and backed out of the gallery, oh so politely titled 'Fashion Bitch'. A wealth of similar such galleries laid out before her as Sonata scrolled, until she landed on one that made Rarity's jaw drop. Or might have, if Sonata's arm wasn't blocking her airway.

'Sunslut'.

Rarity recognized Sunset's distinctive colors in the thumbnail, before her mind processed it in detail. Tapping it, Sonata gleefully opened up the latest video and hit play.

The sound was turned down, but Rarity heard clear as diamonds Sunset moaning, crying out for more. Sonata's blue hips and asscheeks collided with Sunset's orange-yellow, dusky blue nuts leaving behind inflamed, angry imprints on her friend's wealth of generous, jiggling ass.

"This position is called a mating press! It's my favorite position 'cause I get to see their stupid faces when I'm putting babies in them! We're expecting twins~" Sonata pouted. "But there's not enough room for that in here, so I gotta figure out something else."

"You... m-monster."

Sonata's expression morphed into mock hurt. Placing her phone-holding hand to her buxom chest, she scoffed. "Monster? How am I a monster? You guys always act the same way. Noooo, Sonata, don't put your big hot maredick in me and make me pregnant. Ooooh, yes Sonata, please fuck me harder, I want your babies! Just wait and see, I'll be right again!"

"Never," Rarity growled.

Clucking her tongue, Sonata easily deposited her phone back between her breasts. Her black tie and striped fuschia tube top held it in place from falling any further.

"Silly. You'll get it before long, and then we can have even more fun together! Sunny's gonna be like, soooo happy when she finds out I broke you too, ohmigosh I'm just so excited!"

Choking her for emphasis, Sonata ground her pelvis against Rarity's panty-clad ass. Something large, hot, and hard pulsed with need, and Rarity's struggle renewed.

"Don't be shy. Little 'Nata loves to meet new pussies. Isn't that right?" Snickering maliciously, Sonata tugged down her ass-hugging princess pink miniskirt. Without panties or even a thong in sight, her long, flared and veinless mass slapped against Rarity's back, already drooling and staining her white fur with pre. It sank in, warm and wet, and Rarity offered a muffled growl in response.

"Nuh uh, none of that~" Sonata chirped.

Withdrawing her arm from Rarity's throat, she used her hand to push her face against the mirror. Cheek flush against the glass, Rarity had little way to speak or make noise. As Sonata roved the plentiful expanse of Rarity's buxom body, groping and squeezing every wobbly deposit, she ground her shaft between Rarity's asscheeks, smearing it from underwear to bra with slime and steam.

"You're... mmmmf!" She squealed as Sonata's flared tip spat a wad into her mane. "A positively repugnant creature."

"Aww... Now that's just mean. Come on, it'll be fuuuun~ Lemme show you and you'll like it like every other mare I've done this to."

"Doubt it," Rarity mouthed through a sneer. It did nothing to deter the blue devil masturbating on her ass.

"Huff. If you're gonna be like that, I'll just have to get you warmed up first!" Sonata's impatience and disappointment vanished, much to Rarity's terror. Reeling back her hips, her cock stood in the air, curved upwards and aimed at her panties.

"Don't you dare you, you... ruffiiAAAN!"

Rarity squealed, eyes blinking wide. Through a mixture of excess pre and Rarity's stress-induced sweat, it provided all the slickness Sonata would need to penetrate. She didn't go straight for her cootch, aiming lower and sliding apart the fluffy gates of creamy marshmallow thighs.

Sonata sank as deep as she could. Her low-hanging balls slapped Rarity's flesh. She couldn't see them, either through the mirror or glancing behind, but she could feel them. Twin orbs, heavy and full, each one big as two closed fists. Heat and liquid broiled beyond the sack and flesh, burbling and popping with steamy, needy, greedy swimmers.

That would be bad enough, in and of itself. Worse, was the harsh, insistent, dominant throb that made Sonata's firm mast twitch every couple seconds. The echoes of it traveled around in a wave, carrying heat and musky moisture that gathered in her panties, turning the cloth hot and sodden.

More hot and sodden than before. Not that she'd admit such a thing to anypony. Let alone this bubble-brained bimbo predator.

Another throb, another thrust, in and out, the flesh grinding against Rarity's swollen cameltoe.

She shuddered, trying to ignore any positive sensations. She wouldn't let them show, couldn't let Sonata get the satisfaction.

For as long as she could, anyway. It wasn't as though she had a choice.

"I bet your titties look real hot pressed up against the mirror. I should totally test that!"

Rarity didn't legitimize the vulgarity with a response. Instead, she observed helplessly on as Sonata rocked herself back and forth, bumping the mirror with her cockhead, and reached over to undo the clasp of Rarity's bra. With a couple yanks, tugs, and annoyed grunts from the bluenette it came down, then fell the rest of the way to expose her bare bust and puffy purple nips.

"D'awwww, that's so cuuuute." Her dick apparently agreed, splashing a small explosion of prespunk onto the mirror. "Ari has purple ones too, though hers a little more pink! Dagi's are kinda like a creamsicle."

Rarity did want to bite back with some barb, some insult to Sonata's intelligence. She knew it was a terrible idea, ultimately. Either Sonata was fortunate not to have been caught thus far, or she really was that cunning. In either case, she couldn't risk insulting the mare with a dick currently inside her thighs.

Squish, squish, squish, squelsh.

Said mare used her thighs like a personal fleshlight, giddily sawing herself back and forth. Sometimes she'd wait to bottom out, cockhead bumping the mirror. Other times she'd pump her hips in small, rapid jerks.

In both cases, she made a mess of things. Those heavy nuts weren't for show; spurts and globs of copious pre gorged freely from her tip, staining alabaster coat shiny matted gray. The heat of it all turned the space between Rarity's legs into a warm, wet, slime-slick environment tailor-made for fat futa flare, and it both terrified and aroused her at the concept of the same happening to her womb.

She pushed the thought out of her mind, as at the same time Sonata's pace grew frantic. Thrusts turned erratic, giggling became manic, and her short, gasping breaths suggested only one thing. Sonata's grip tightened, especially the hand on her hip.

Rarity glared with all her authority, sapphire eyes narrowed to icy slits. "Do it, and I'll use a letter opener on your throat."

"Heehee." Sonata withdrew, a nasty, dripping klschlop sound filling the room as her cock popped free. "Dagi says the same thing. I wasn't gonna cum in there anyway. I got way better places to do it than that!"

Rarity didn't ask where she meant. They both knew.

In one motion, Sonata gripped Rarity's panties and yanked them down. Rarity yelped, the cooler air brushing her inflamed pinkish petals. Sonata had no such qualms, and before Rarity could hope to try getting a word in-

SCHLIP! Plap~

Sonata sank her tool down to the root. Rairty's body spasmed, limbs seizured, fists banged against the mirror. She saw stars in her eyes, and a belly bulge in her waist.

Hoofsteps approached from far off, sounding as underwater as the coaxing push and pull of cock in her cunt. Somepony knocked.

"Is everything okay in there? I heard a shout."

Sonata kept fucking. "Everything's fine! Just squeezed something in a bit too tight, heehee."

The mare behind the door laughed. "I know that feeling." Like that, she went, leaving Rarity to her fate.

"Okie dokie. I think that's, like, enough warming up for now. I really wanna knock you up already."

Rarity's heart thundered. She knew that was this sea devil's intention. Somehow it hadn't been 'til now the reality of it struck her fully.

"G-g-get off me," she whined. Planting both hands on the mirror, she pushed, pushed, pushed some more.

She didn't budge. Her hooves slipped in the process, body falling and knees thunking against the changing room seat.

"Oooh, that's a great idea! Gosh, you're smart. I shoulda thought of that." Still lodged inside, Sonata repositioned herself over Rarity, half-squatting on the seat with her. "I can like, breed you soooo much better this way. I wonder if Aria'll know what this position's called. She's a kinky bitch."

She lowered her snout to Rarity's ear, growling, "So am I."

WHAP WHAP WHAP WHAP!

With her new vantage, Sonata's thrusts came down at an angle, hammering Rarity with heavy blows. Dusky aqua jizztanks swung back and flung forward, smacking Rarity's ass with each violent thrust. The impacts stung, making Rarity yip or squeal from the mix of pain and pleasure.

She wrenched her eyes shut. Tears flowed freely down her cheeks, stained black with mascara, thin inky lines that crawled along her cheeks and chin. She hated the humiliation, but worse?

She hated how good it felt.

And Sonata didn't let up from there. Not only did Sonata fuck hard, she fucked fast. Too fast. Fast enough and hard enough that Rarity's head and horn banged against the mirror, somehow just the right volume not to alert anypony.

Sonata was certainly experienced in the art of stealth-fucking. She'd give her that.

And her womb. And eggs. And babies.

Sonata sighed, maintaining her casual bimbo demeanor even as Rarity devolved into a groaning, guttural mess. "It's too bad I can't fuck you at home. I could make you scream as louuuuud as I want." She perked, beaming. "But that's okay!"

SLAP SLAP SLAP PLAP PLAP!

"I'll do that anyway."

WHAP SLAP PLAP!

"And after this?"

PLAP PLAP SLAP SLAP PLAP!

"You'll, nnnnf. Come, hnnngh. C-crawling, hhhh, baaaack!~"

Sonata moaned. Rarity, to her shame and defeat, moaned with her.

Hilting inside, Sonata's flare fully bloomed. She kept the gargantuan beast planted square in her passage, unmoving beyond the rise and fall of her buxom chest and rapid clenching of her dangling hangers.

Rarity felt a throb before the first cumshot.

She passed out by the tenth.

"Oooo, that was good."

Cackling behind her hand, Sonata extracted Little 'Nata from Rarity's puffy pony puss. It was all bubblegum pink and red, like Aria's ass when she spanked it.

She wiped her hands off, a few last errant streams streaking out her flare. Batter disgorged from the stretched, creampied hole that now belonged to her.

It was a job well done. Silly slut passed out which was no fun, but that also kinda had its own appeal when you really thought about it! Wasn't like she hadn't plowed her sisters in their sleep before~

Though, mm. Usually by the time she came they'd been awake for a while.

Clenching her kegals, Sonata aimed her cock more to Rarity's level. Whatever dregs of spunk remained in her kegs' backlog spewed out, slapping like hot sticky white streamers across Rarity's ass, thighs, back, even a couple on her hair and face. Sonata hoped she'd appreciate the present, once she woke up.

"Now, gotta make sure you know where to find me~"

Whistling, she skipped over to Rarity's clothes, hung up on temporary hangers. The pants were a pretty shade of purple, close but a bit lighter than Rarity's mane. She dug around for the phone, and tucked the pants under her arm to give Adagio as a present. Rarity didn't swing around a big fat booty like her big sis, but when Adagio liked clothes, she found a way to make them fit.

Kinda like Sonata and her dick, now that she thought about it!

"Let's seeeeeee." With a chirpy hum, she swiped through the phone. No password protection luckily, kinda like its owner's womb. She added herself to Rarity's contacts, downloaded some background apps to track and control the device, and DM'd Sunset to let her know Rarity would be joining them soon. "Just oooone more thing."

Setting Rarity's phone aside - wherever, she really didn't care - Sonata pulled out her own. She snapped several pics from multiple angles, some further away and some closer up, like getting a frontal view of Rarity's gaping, seed-stuffed spermsleeve. After, she recorded a video selfie of herself wanking off onto Rarity's unconscious body.

She sent them all to her numerous pets. They'd get jealous, but getting jealous just meant a line of hot baddies wrapped around her block. Then she could throw an orgy rave. Vinyl would be so down for that, and she was even kinkier than Aria!

At last, she was finished. She turned to leave, starting to open the door when it bumped against her semi-flaccid marecock.

"Whoops! Silly me~" She stuffed her dick inside, rearranging the family jewels and skirt to better fit.

Skipping away from the changing room, Sonata felt a pep in her step she hadn't quite possessed that morning. It had been a good day for Dusky. It was gonna get a whole lot better when she got home.

Author's Note

This was a story written for Tailsic. If you enjoyed the read, consider getting a commission!