My Pet Derpy

by Vinyl_Wubs

Rating: mature
Tags: Sex, Derpy Hooves, Anthro, Trixie, My Little Pony: Friendship is Magic, Romance
Length: 6428

Trixie gets' a package in the mail that she has been waiting on for quite some time. The only problem: Derpy is the one delivering it!

Warning: Story contains domination, auto-fellatio, cum inflation, large insertion, size change, futa, and devious acts of Trixie. Reader discretion is advised.

Trixie orders a new toy, and invites Derpy in for a drink. Derpy however, loves boxes, and decides that she should check it out. It could be a bomb for all she knows! Technically she's not breaking the law by opening the package... She already delivered it, and was invited inside. It just happens that Trixie's guest saw a box in the corner and just couldn't help herself. Derpy logic away!

Co-written and edited by TheOnlyOneWhoCares.

Published 2015-04-21 01:40:02 UTC
Last updated 2015-04-21 01:40:02 UTC

Chapter 1: Doggy Hooves

Trixie’s heart skipped a beat at the sound of a knock at her door. She had eagerly been awaiting her ‘package’. She jumped to her feet and scurried to the door, throwing it open. In front of her was the usual delivery pegasus, Derpy Hooves. Only… she didn’t have a box in her hand.

“Hello!” Derpy said, a cheery smile on her face. Trixie narrowed her eyes, scanning the delivery pony.

“Where is it?” Trixie tapped her foot impatiently.

“Oh, you mean this?” Derpy hummed, bending over and revealing the package encompassed neatly with her wings. “Tada!”

Trixie rolled her eyes and cracked a smile. While she had been trying to get used to being ‘nice’, she couldn’t help but be genuinely amused by the silly pegasus on occasion. Trixie gave Derpy applause and shook her head.

“Thank you, thank you! I’ll be here all week!” Derpy said, bowing in a sarcastic manner. Trixie took the package and was about to close the door, only to stop at Derpy’s still smiling face, not moving an inch from in front of the door.

“I think your face is broken.” Trixie raised an eyebrow.

“What? How? I can still do all of the things I used to be able to do…” Derpy said, putting her hands on her face and moving them around, checking for anything wrong. Trixie’s smile grew and she couldn’t hold back a laugh at the innocent oaf.

“You wanna come in for a drink?” Trixie offered.

One hand over her eyes, and the other on her nose, Derpy said, “Sure! That was my last delivery anyway.”

Trixie let another laugh slip out before opening the door. “Are you always this… you?” Trixie asked.

“What?”

“Just get in here.” Trixie’s magic lifted Derpy into the room and threw her onto the couch.

With a *POMF*, Derpy landed on the cushions, her wings spread out to absorb the impact. Giggling, she said, “What’re we gonna do on the couch, Trixie?”

“Well, you’re going to sit there, and I’m going to get some refreshments. Whatever would you like, I probably have it.” Trixie asked.

“Hmm… what about a mug of hot chocolate? With the little marshmallows? And a peppermint stick?” Derpy asked.

“Water, gotcha.” Trixie nodded, disappearing into the kitchen. Derpy pouted, her ears drooping. “And don’t touch that box.” Trixie said, peeking out of the kitchen. “That box,” She stated, pointing to the new package. “That one right there, don’t touch it, whatsoever. I mean it. You are not allowed to touch THAT box.” She finished, returning to the kitchen again.

Derpy got up and went over to the box, opening it up immediately. Inside, she saw what looked like a belt, with a strap that went down the middle, making it look more like a pair of underwear than anything. On the front of it was a picture of a dog’s paw. Lifting it up in front of her, she looked at it from back to front, noting the little buckles and hinges on it that helped it to be secured in place. Out of nowhere, she got the impulse to try it on, and after a moment’s deliberation, went with it. Slipping it up her legs and around her waist, she made sure all of the buckles were tightened, snugly fitting around her hips. After she was done, she looked all over it, and noticed something strange: the dog’s paw on the front was glowing. Hesitantly, she brought her finger down, and poked it, wondering what was going on. Immediately, it starting giving her a wedgie of massive proportions, a soft *eep* escaping her mouth as she valiantly tried to take it off. The more she pulled, the more it resisted. The glow grew brighter as it started to slip through her fingers, and sinking into her pants. She started feeling the belt against her skin now, the strap beneath slipping between her lower cheeks, and lips.

“GAhh…” She grunted out, the noise quickly turning into a moan as she felt the belt start to vibrate.

“What’s wrong?” Trixie asked curiously, stepping into the room once more with two glasses of water.

Turning around quickly, Derpy blushed, saying, “N-Nothing! Uh, uh, I w-was just looking around, and I… tripped! Yeah, I tripped.. but uh, I’m fine now, y’see?” She asked, spreading her arms out. Under the facade, though, much more was happening. Her wings, overcome with pleasure from the vibration of the harness, began to unfold out, quivering, as it slowly began to sink even deeper between her lips and crack.

“Okay?” Trixie raised an eyebrow, taking a seat next to Derpy and handing her a glass. As she took it, Derpy felt something slipping into her snatch. However, whatever it was, was very small.

Quivering, she jumped up, and said, “Ehm, I’m g-gonna go now! Th-th-thanks for the offer, but I gotta go g-get...uh… muffins!”

“Non-sense. You said it was your last delivery, so I’ll fix you something. You’re my guest after all.” Trixie suggested.

“N-no! I wouldn’t w-w-w-want to impose, after aaaaall…” She said, moaning near the end of it as another small invader went onto her plothole, quickly going a few inches deep. Suddenly, the new ‘guest’ within her started to grow rapidly, stretching her hole open faster than she would have guessed. Trixie narrowed her eyes and stared suspiciously at Derpy.

“Derpy, where’s my package?” Trixie questioned.

Starting to sweat, Derpy said, “Ah… i-it’s over there! See, on the table you put it d-d-down on!”

Trixie turned to the box, which was closed and right where she left it. She stood up, lifting the box with her.. She noticed it was lighter than before, turning back to Derpy once more before wandering into the kitchen to inspect it. Derpy felt several sharp objects stab her insides as multiple tiny objects ejected from whatever the intruder was. The pain quickly turned to pleasure as the invader in her marehood stretched all the way to her cervix, even sending a thin strand inside so as to fill up her womb. Suddenly, a burning feeling hit her as the object poured something inside her, and she could feel it filling every nook and cranny of her inner sanctum. She swore she could feel it filling up her tubes, her ovaries, everything inside of her.

“What did you do!” Trixie’s voice sent a cold chill up Derpy’s spine. Trixie stormed into the room, glaring at Derpy’s sweat gleaming body.

“T-T-T-Trihihihiiiixieee…” Derpy groaned out, flopping onto her knees. Trixie’s expression slowly turned to surprise.

“Are you… alright?” Trixie asked slowly.

Falling over even further, Derpy’s rump ended up thrust into the air, her face grinding into the floor as she said, “It hurtssss… but… but it f-f-feels so goooood…”

Trixie’s face was bright red. “D-did you... put it on?” She stammered.

Derpy couldn’t even speak anymore, the feelings of everything happening down below overpowering even her movement. Looking at her plot, Trixie could see the faint outline of the belt, writhing and twisting, vibrating upon her skin. Trixie’s eyes widened as she saw Derpy’s pants slowly filling out in the crotchal region, a gigantic bulge beginning to run down her leg.

“M-make it stooop... “ Derpy pleaded. “It’s too muuuch, I-I can’t handle iiit…”

Trixie was about to say something, when Derpy went limp, panting and wheezing heavily as all the sensations came to a halt.

“Wh-what...what was all th-that?” Derpy breathed out.

“Why don’t you tell me!” Trixie snapped, throwing the empty box at Derpy, who barely even noticed as it bounced off of her head. “What one thing did I tell you?”

“N-not… to touch th-the booox…” Derpy moaned out.

“And what did you do?” Trixie questioned, crossing her arms.

“I… t-touched the bo-ho-hox…”

“You touched the box.” Trixie stated parallel to her. “Now take off your pants.”

“I… wha?” Derpy asked, cracking a single eye open to stare at Trixie in disbelief.

“I said, take. Your. Pants. Off.” Trixie emphasized.

“A-alright.” Derpy said, unbuckling her belt and slipping her work pants off, followed by her skin-colored panties. Immediately, a foot-and-a-half cock sprang up, hitting Derpy in the gut none too lightly from her position, which caused her to fall back onto her plot. Looking down, she saw that it was very red, with a tapered tip and a section near the base that seemed thicker than the rest of it, the whole thing nearly 3 inches thick at it’s thinnest part. The tip was continuously dripping precum, starting to drool down her new appendage and pool onto the other recent addition- a pair of large, canteloupe-sized testicles that had taken place of her marehood. Trixie’s mouth was hanging open slightly, snapping out of her trance moments later.

“They did say extra large…” Trixie said to herself. “Now since you have been a bad guest, I think it’s time for some punishment.” She stated.

“I… what? P-Punishment?” Derpy stuttered out. Trixie yanked Derpy over with her magic, the grey pony now bent over her knee.

“Punishment.” Trixie smirked, raising her hand and smacking her plump backside, letting the sound of jiggling flesh echo through the room.

“A-ah!” Derpy squeaked out.

“Count, now.” Trixie ordered, bringing her hand down on the reddening cheeks.

“O-one!” She whimpered, her wings beginning to spread out.

“Louder!” Trixie stated, bringing her hand down harder, the force of the spank sending ripples down to her new appendage.

“ONE!” Derpy screamed out.

“Good mutt.” Trixie complimented.

“Thanks y- SOOOOUWW!” Derpy squealed as she was spanked once more.

“Did I say you could speak out of line?” Trixie questioned, reaching down and gripping Derpy’s sack tightly. “You do not speak unless I allow it, do you understand?”

“Ye-hes, M-Mistress…” Derpy cried out.

“That’s a good little bitch, do you hear that? You’re my bitch.” Trixie added, gently squeezing the tender red hand print on her butt.

Panting from the pleasure, Derpy shakily nodded, almost speaking, before she remembered her Mistress’s commands. Trixie pushed Derpy off her knee and to the ground. Thudding down, she barely caught her self, the sudden motion catching her by surprise. “Dogs walk on all fours, so walk, bitch.” Trixie ordered.

Shakily holding herself up, Derpy began to shuffle forward on her hands and knees. However, the new additions to her crotch threw off her balance, causing her to tip over onto her side. Trixie’s character slipped and she couldn’t hold back a giggle, covering her mouth immediately.

Glancing back at her, Derpy got back up onto her knees, once again trying to shuffle about the room. The biggest problem (heh) was her new cock, which, being hard as it was, continuously rubbed and shifted against her skin, getting harder and harder with every step. “Alright, come to Mistress.” Trixie said, motioning Derpy over with a finger.

Immediately, Derpy shambled over to Trixie, a confused look on her face. “Mmm, lets’ see.” Trixie pondered aloud as she grabbed the box from earlier, digging around inside and pulling out a slip of paper that read ‘Instructions’. Trixie’s face grew slightly red as she read the paper to herself. “Wow… It can do all that…” She mumbled. Trixie looked down at Derpy for a few moments. “I think you deserve a treat for all your obedience.” Trixie suggested, her smug grin returning. “Pleasure.” Trixie stated aloud. Derpy’s eyes snapped open wider as waves of pleasure started coursing through her genitals.

Groaning out, Derpy looked down at her cock, seeing the length throb and pulse, the knot near the bottom starting to expand. “Wh-wh-what… M-Mistress?” Derpy asked, looking back up at Trixie.

“Did I allow you could speak? Dogs can’t speak, now bark for me.” Trixie ordered. She took a glance down at the instructions for a moment. “Cease.” She stated, the pleasure immediately stopping, leaving her with painful blue-balls.

“Ah, wh-... b-bark… woof, woof, r-ruff…” Derpy said in a pained voice.

“Now, beg for your treat.” Trixie cooed softly, kneeling down in front of Derpy.

“Tuh… Trixie, p-please…” Derpy pleaded.

“Wrong.” Trixie snapped. Derpy’s balls immediately started to feel heavier, begging for release as the pain started to fill her entire body. “Beg like a dog!” She commanded.

Derpy leaped up onto her knees, her arms out in front of her like paws, her tongue hanging out, saying, “Woof! Woof, woof! Bark, ruff ruff!”

“Good mut. Collar.” Trixie stated. A gentle hum emanated from Derpy’s crotch as a solid black collar appeared around her neck. “Now, cum for me, bitch.” Trixie ordered. Derpy’s entire body quaked as pleasure rocked her, the knot at the base of her shaft swelling up immediately as a thick white liquid bubbled from the tip. Moaning out, Derpy’s wings shot out to her sides, quivering, as a long, thick, sticky string of spunk shot up from her cock, up onto the underside of her jaw, splattering all over her. “Cease.” Trixie ordered. Derpy’s cock bulged out painfully, as her orgasm was cut short and forced to stop, her balls swelling once more with denial.

“Aaaahh!” She screamed out, the pain washing through her body. “Wh-aaah!”

“Roll over.” Trixie commanded.

Derpy fell onto her back, trying to roll. “I-I caaaaan’t! M-m-my wings, they’re too haaaard!” She shrieked out.

“What a shame.” Trixie hummed. The pain of her gurgling and churning sack only grew worse over time.

“Maaahaake it st-stoop, Mistress, puhlease!” Derpy cried out, the pain only getting worse as her urethra began to fill up with cum, swelling out from her cock forcefully.

“Maybe it’ll stop if you suck it out.” Trixie suggested. “Grow.” She announced. Derpy’s cock started to lengthen slowly up her body, inching towards her head.

Pushing up her chest, the cock spread her teats apart, the large mounds squishing out around it as it reached up towards her mouth. Finally, it began to push up against her lips, the cock pressing against it harder and harder with every second, until she opened her lips, accepting it into her maw. But it didn’t stop there. It kept growing, the tip going deeper and deeper until it butted against her throat, forcing it’s way into Derpy’s esophagus. Her eyes snapped open, the feeling of it bulging out her neck washing over her body. Trixie felt her nethers wetten at the sight alone. She stood up and slipped her shirt off slowly.

But it still wouldn’t stop. Derpy felt her cock reach down her throat, going past her collarbone, starting to disappear into the area below where the bulge could be seen. “Cease.” Trixie announced. The cock immediately stopped growing, now firmly lodged inside Derpy with no way of escaping. “If you’re wondering how you’re breathing, you can thank the collar.” She mused.

Derpy couldn’t even hear her, didn’t notice anything beyond the throbbing of her cock. The pain, the pleasure, all of it, it just wouldn’t stop. She picked her hands up off of the floor, wrapping them around her length and stroking it, trying valiantly to make herself cum. “Did I say you could touch yourself?” Trixie’s voice boomed, making Derpy’s body tense up nervously.

Derpy took her hands off of her length, her fingers twitching and shaking. “Mistress gets to have fun first. Now, if you manage to last until I’m done, I’ll give you your treat… But if you don’t, you’ll have to wait even longer.” Trixie instructed, unhooking her own bra. As her light blue breasts bounced free, Derpy’s shaft throbbed harder at the sight. She nodded as best she could, given she was deepthroating herself. Trixie slipped her pants off, slowly and teasingly shaking her ass in front of the pegasus, whose cock twitched violently at the sight. Trixie slipped her panties down, giving Derpy the first view of Trixie’s pussy she’d ever seen, along with a nice, tight hole that looked great for stuffing a cock into.

“Mmmh…” Derpy moaned out, reaching a hand out to Trixie.

“Oh? Do you want this?” Trixie asked, using two fingers to spread her pussy open. “Do ya, do ya?” She teased.

Derpy nodded again, stretching her hand even closer to Trixie. “Well, if you last through this, I’ll let you do whatever you want to me.” Trixie said dismissively as she started fingering herself slowly.

Groaning, Derpy laid her hands back down. Every few seconds her mouth let out a *gulp* sound, as her throat involuntarily swallowed around her cock, the muscles closing around it up and down, over and over. Trixie was only turned on further by the sight, her juices leaking down onto the floor and letting a quiet moan escape her mouth. Derpy closed her eyes, trying to ward off her orgasm, but all she could see was Trixie’s plush, wet ass, the bouncing cheeks spreading to give Derpy a view of her marehood. A louder moan rang through Derpy’s ears as Trixie’s pleasure rose. The dominance must have excited her, seeming that her Mistress’ orgasm wasn’t far away. Trying her hardest to outlast her mistress, Derpy tensed up her stomach and began taking long, deep breaths, doing whatever she could to dull the feeling of intense pleasure. “Ohhh yes… That’s right, fuck me silly.” Trixie moaned, obviously lost in a fantasy of her own design.

Shivering, Derpy shut her eyes tighter at the sound of Trixie, the knot on her cock once again swelling to an even larger size. “Nnaaahh!” Trixie groaned loudly. Derpy’s eyes opened and she saw Trixie’s toes curled, her ass in the air and her whole body frozen, her orgasm obviously in progress. She then reached a hand back out to Trixie, brushing against her arm in a questioning manner. Trixie however, seemed lost in her own afterglow. Derpy’s shaft started to shrink until it was dislodged from her throat. She was confused at the this, but before she could question it, her eyes were once again locked on Trixie’s bent over figure, practically offering herself to be mounted and bred.

Panting, Derpy pulled her head back, releasing the last of her cock from her mouth as she stood up, walking behind Trixie. Putting her hands on top of her cock, she roughly slapped it down onto Trixie’s back, the length stretching from the crack of her ass to the base of her mane. Leaning down, she wrapped her arms around Trixie’s body, whispering in her ear, “Now… now I get to do whatever I want to you… and you know what I’m gonna do?”

Trixie’s heart skipped a beat. “H- huh?” Trixie’s eyes widened.

“I am going to WRECK your ass…” She hissed. Trixie’s chest was still heaving from her orgasm. Her magic flared to life and attempted to push Derpy back. The collar around Derpy’s neck let off a dim glow and cancelled out Trixie’s magic. “What’s wrong? You can’t dominate me anymore, hmm? Don’t you remember what you said, Mistress?”

Trixie’s hand shot forward for the instructions, only for Derpy to yank Trixie off the couch and onto her hands and knees. “Just… just wait a m-minute!” Trixie stammered.

“Let me think… no.” Derpy said, reaching her hips back. The wet tip of her cock brushed up against Trixie’s asshole, gently pushing on her the barrier to her rectum. “Any last words?”

“Um… d-do I get one phone call?” Trixie mumbled.

“Nope.” Derpy stated, beginning to push forward into Trixie’s ass.

“Nnnggaah!” Trixie groaned deeply, pressing her face into the couch cushions.

“Mmm… y-you’re so tight… Trixie, are you… a v-virgin?” Derpy asked, the tightness nearly stopping her in her tracks.

“Y- yeah…” Trixie answered shakily, her nails digging into the cushion almost painfully.

Derpy halted, her grin falling, and said, “Oh… oh shit. Trixie, I… I didn’t know…”

Trixie didn’t respond, she had her face firmly in the cushion and wasn’t moving.

“T-Trixie?”

“Just… keep going, if you want…” Trixie squeaked out.

“I… alright.” Derpy hesitantly said, as she continued to push her yard-long cock into Trixie’s ass. Trixie whimpered quietly, her body starting to shake again. Leaning down, Derpy grabbed Trixie’s tits, roughly squishing her soft mounds in her hands. A cute, almost out of character moan escaped Trixie’s mouth, her body relaxing slightly.

A few moments later, Derpy felt her knot bump up against Trixie’s ass, the overly-thick portion of her cock having nowhere near enough force to stretch Trixie’s ass wide enough. Trixie tightened around her and shivered. “Shhph…” Trixie groaned.

“Shhh…” Derpy whispered. “Just relax, and then it’ll hurt less.”

Trixie shakily nodded and attempted to relax, and Derpy felt the tunnel that was wrapped around her loosen slightly. Bringing a hand up to Trixie’s head, Derpy stroked through her hair, making soft coos at the mare in an attempt to get her to relax further. Trixie went limp, her eyes growing almost lazily so as she awaited Derpy’s next move.

Pulling her hands back down to Trixie’s hips, Derpy began to push into her, trying to force her five-inch knot into Trixie’s virgin plot hole. “GUH!” Trixie practically screamed, her legs gaining new life as they kicked back. Ignoring the feelings of pain in her lower limbs, Derpy shifted her hands and gripped Trixie with an iron hold, determined to force herself inside of the mare. Looking down, she screwed up her face and pulled out slightly, spitting onto her knot in an attempt to make it easier as she once again pushed into Trixie. “Well? G-gnnh… Get it in!” Trixie commanded half-strained.

“I’m s-sorry, it’s not exactly easy, y’know?!” Derpy retorted.

“You’re just doing it wrong!” Trixie stated, kicking off the couch and into Derpy.

Growling, Derpy said, “You want me to force it in? FINE!” As she pulled her hips back and mightily forced herself in, the knot disappearing into Trixie’s ass in an instant. The two of them shouted a pleasured and pained moan.

“This should be hurting, but nnnooh, it’s great!” Trixie gasped. The moment the knot was lodged inside, it started to vibrate pleasantly for both participants.

“Gods, Trixie, wh-where did you even get this f-from?” Derpy asked.

“Magazine… got from Twilaaaaiiigh...t.” Trixie trailed off into pleasured babbling.

“S-since when does… does Twilight have things l-like that?” Derpy questioned, making small hip movements into Trixie. She turned back to Derpy with a smirk on her face.

“Maybe we should… pay her a visit after.” Trixie giggled and moaned.

“Nnnf… maybe… show her how well it works?”

“Ohhh great idea… powerful idea.” Trixie shuddered with more waves of pleasure emanating from the more-than-just-a-toy toy.

“Mmm… why a… D-diamond Dog-shaped one, though?” Derpy asked, feeling her thrusts start to become erratic.

“Would you… prefer a normal one?” Trixie raised an eyebrow, gritting her teeth behind her closed lips. “Have you… ever had sex?”

“Trixie… I do have a daughter, y’know…” Derpy flatly said.

“Then you know why it might… interest me. Variety, curiosity…” Trixie added.

Derpy was silent for a moment. “While… I’ve never had a regular c-cock, I can definitely say that this one is a-an experience, at least.”

“H-hey… hand me the instructions.” Trixie motioned to the box. Taking her hand off of Trixie for a second, Derpy handed her the slip of paper, resuming her buttfucking. Trixie groaned quietly as she read through the paper. “Oh, this looks interesting.” She hummed pleasantly.

“Whaaat is it?”

“Heat.” Trixie stated. The two let out a sharp gasp as Derpy’s cock started to grow hotter, and hotter still… the burning mixing with each vibration of the knot, driving the two absolutely insane.

“G-gah… what else can th-this thing do?” Derpy asked. Trixie’s quivering hand handed the sheet back to Derpy. She took the paper and read it for a moment, a silly smile sweeping over her face. “Collar!” She said aloud. The collar around Derpy’s neck teleported onto Trixie’s.

“Ohohohoooh… get ready for fun, Trixie…” Derpy said, a sinister smile on her face. Trixie blinked a few times, tugging on the collar. Surprise surprise, it didn’t budge.

“Let’s see, first: Derpy: Numb toy.” Derpy said, preparing herself. Immediately, she felt(or rather, didn’t feel) the nerves on her cock deaden, making sure she didn’t cum during her playing with Trixie. “Now, Trixie: expand ass.”

“Whaaa!” Trixie shook as her fleshy mounds started to swell with an audible gelatinous jiggling, folding neatly around the cock she was still impaled on.

“Heh, cease.” Derpy said, after about a minute of slow growing. Trixie shivered and reached back, asking for the paper, which Derpy handed to her with ease. Trixie stared at one part of the paper that seemed to boggle her mind, and Derpy could see the confusion on her face. “What is it?”

“I just… lemme test something.” Trixie said. “Derpy: Split.” There was a lod *POP* behind her, and she heard Derpy gasp. “What happened?” Trixie asked, not wanting to even turn around from the constant pleasure that was sapping her strength away.

“There’s… two of me!” Derpy shouted out, from two places at once. Trixie’s eyes widened, her head snapping back and seeing the identical copies staring side-by-side at each other.

“Woah…” The first Derpy said.

“Hey, I have a cock, too!” The second Derpy said. Trixie grinned widely.

“Maybe we should get you a different name so we don’t get confused.” Trixie suggested.

“Hmm… what about...Muffin!” Derpy said.

“Oh my gosh, I love it!” Muffin said, squealing in joy. Trixie rolled her eyes and started to laugh.

“Couldn’t have done better myselffffphhaaah!” Trixie caught the two off guard as her orgasm rocked her body, spasming around the invading member inside her tight ass.

“Trixie: Cease.” Muffin commanded. Trixie started to shake as her pleasure was suddenly cut off.

“Wh… huh?” Trixie mumbled.

“Trixie: Deny further orgasm.” Derpy added on. “C’mere, Muffin.”

Walking forward, Muffin held onto Trixie and Derpy’s shoulders, kneeling down onto her knees in front of Trixie, staring into her eyes. “Why…” Trixie whimpered quietly.

A soft smile on her face, Muffin said, “So we can make it even better… if that’s what you want, that is. Do you want me, too?”

“If… if you want…” Trixie mumbled, shaking even more.

Placing her hands on Trixie’s face, Muffin asked, “No, Trixie, the question is: Do you want to?”

“Can we just… take a break?” Trixie suggested.

“Whatever you want.” Derpy and Muffin said at the same time. Derpy mumbled a few words, making sure to numb Trixie’s ass, before she pulled herself out, leaving a rather noticeable gape in her plot. Trixie went limp, breathing heavily on the couch.

“Derpy, Muffin: Shrink.” The other two mares said. Sitting down on the couch next to Trixie, they pulled her up into a joint hug, and Derpy asked, “Is everything alright?”

“Not really…” Trixie shook her head.

“What’s wrong?” Muffin asked.

“I just like…” Trixie trailed off, looking away from the two.

“It’s alright, tell us.” The two of them said.

“I like being the one… you know… In charge.” Trixie said, her cheeks growing redder by the minute.

“Well, why didn't you say anything?” Derpy giggled out. “I would’ve been fine with that, silly!”

“I didn’t really get the chance…” Trixie mumbled.

“Well… do you want to go again, but this time in charge… MIstress?” Muffin asked. Trixie’s ears perked up at the words, but she didn’t respond. “C’mon, Trixie… we’ll do whateeever you waaaant…” Derpy breathily said into her ear. Trixie licked her lips and smiled.

“Well…” Trixie started.

“We’ll be your willing pair of slaves…” Muffin said.

“For you to order around, and make your bitches…” Derpy continued.

“Won’t you let us serve you, Mistress?” They both purred. The collar from Trixie’s neck disappeared, and two new collars appeared around Derpy and Muffin’s necks, each one with a different name etched on it. Trixie’s smile widened to ridiculous proportions.

“Woof!” Bitch #1 said.

“Bark!” Bitch #2 said with her.

“Muffin.” Trixie stated.

“Ruff.”

“Fetch me the instructions.” Trixie ordered.

Muffin reached her head over to where the instructions were, grabbing them off of the table with her teeth, before giving them to Trixie. She took the manual and started reading. “Derpy: bind.” She said. A set of ropes bound Derpy to the floor, now stuck on her hands and knees.

“B-bark?” Derpy questioned.

“Time for some payback.” Trixie smirked, the smile sending chills down Derpy’s spine.

Derpy whimpered, afraid of what was to come. “Muffin, mount away. Break that ass in half.” Trixie commanded, pointing to Derpy’s inviting backside. “Oh yeah… Muffin: Grow.” She said. Muffin’s cock started to swell larger, including the knot. “Faster!” Trixie growled, the cock nearly doubling in size before finally stopping.

“G-guh… w-w-woof…” Muffin said, her tongue hanging out of her mouth. Shuffling over to Derpy, she leaped up onto her, poking her cock into the other bitch’s ass.

“W-wait… mistress, please, at least some lubricant? M-mine was wet when I started on you…” Derpy pleaded.

“Let me think…” Trixie hummed, deja vu hitting Derpy immediately. “No.” Trixie stated. “Derpy: Grow.” She stated. Derpy’s cock lurched forward towards her mouth.

“Oh, nnnooo… not agammf!” Derpy tried to say, cut off as her cock shoved itself deeply back into her throat.

“This is what happens when naughty dogs misbehave.” Trixie stated, standing up and kneeling down in front of Derpy. “Maybe I should just neuter you?” She whispered.

Derpy whimpered, shaking her head as best as she could, slowly growing more immobile as her cock continued to grow inside of herself. Trixie gave Muffin a look, nodding slowly.

Muffin immediately shoved herself halfway into Derpy’s ass, the bottom mare screaming onto her own cock, which was now starting to penetrate her stomach, and still going. “Derpy: Deny orgasm until I say.” Trixie snickered.

Moaning, Derpy’s eyes rolled up into her head, the feeling of her cock continuing to grow inside of herself only making her pleasure grow, but never peak. She could swear that Muffin’s cock was about to bump into hers, which, by now, was sitting comfortably in her stomach, leaving a bulge on her belly next to Muffin’s. “Cease all growing.” Trixie stated.

Slowly, Muffin managed to push more of herself into Derpy, the friction on her cock giving her more pleasure than she’d ever had(as, being a clone, she had Derpy’s memories). “Enjoying the double stuffing, bitch?” Trixie mocked, stroking Derpy’s cock slowly.

Derpy weakly moaned, the feeling of the triple pleasure making her nearly black out, feeling her knot swell to colossal proportions, but with nothing to lock itself into.

FInally, Muffin’s knot bumped up against Derpy’s plothole, ominously stopping her movement.

Derpy’s eyes widened, looking up at Trixie with a begging look on her face. “Oh, don’t worry, I’ll make sure it’s pleasant.” Trixie ran a hand through Derpy’s hair. “Derpy: Shrink.” She said, the cock lodged in her throat slowly starting to slip back into her mouth.

“Guh… w-w-woof…” Derpy weakly said, as soon as her cock was out of her mouth.

“Have fun, Muffin.” Trixie smiled, petting the top of Muffin’s head.

“Bark!” Muffin said, pulling her cock back in and slamming it back in. Derpy’s eyes became even more dazzled than her usual appearance, gurgling a pained reply through her own shaft. She looked up at Trixie with pleading eyes, whimpering quietly. Trixie tapped her chin as she thought about the whining puppy below.

“Okay, fine, let’s add some lube.” Trixie rolled her eyes, snapping her fingers. Muffin’s attention snapped to Trixie the next instant. “Muffin: Cum.” Muffin’s eyes widened, and she let out a low moan as she came into her counterpart’s ass. She’d not gotten the knot in yet, though, so Trixie watched it swell further against Derpy’s plothole, now far too large to go in. “Well, Muffin? Did I say to stop thrusting?”

“W-w-woof…” Muffin weakly growled, thrusting as best as she could through the continuous pleasure coursing through her. Trixie grinned proudly at her masterpiece she was slowly creating. She approached Derpy and kneeled down, slowly stroking the cock lodged in her throat.

“Is that better?” Trixie cooed playfully.

Derpy nodded(or at least, tried to) as her stomach began to swell from the large amount of seed flowing into her. “Oh Muffin, dear.” Trixie called.

“R-ruff?”

“When I snap my fingers, your orgasm will get stronger, and stronger, but you will not be able to cum until you get me to.” Trixie added. Even before she snapped her fingers, Muffin’s cum was halted instantly. Muffin nodded, her tongue lolling out of her mouth in want. “But, you are not allowed to stop fucking your counterpart, are we understood?” Muffin nodded once more. Trixie’s smirk grew wider as she stepped in front of Derpy, completely out of range of anything Muffin could do. Before she could even utter a word (or bark) in question, Trixie snapped her fingers. Muffin’s mouth dropped open, her entire body quivering with pleasure as she started thrusting unconsciously. Trixie looked down at Derpy and whispered: “Shrink.”

Derpy moaned in a muffled tone as her shaft started to shrink out of her throat, leaving her room to breathe fresh air once more as the heavy dick bobbed free and smacked against the ground. Foolishly, she said, “Th-thank you, Mistress.”

Trixie’s eyes snapped to the slave below her, about to punish the slab of meat for speaking out of turn. However, she decided to show mercy. “Now, if you ever wish to walk straight again, you’re going to have to make me cum. But however will you do that with that slut on your ass?” Trixie mused.

Derpy thought for a moment, then hesitantly began to lean back, adjusting Muffin’s grip so that they ended upon their knees, Muffin still thrusting relentlessly into Derpy’s ass. Her cock waving about in the air, Derpy slowly scooted forward, bringing both of them closer to Trixie, inch by inch. Trixie lied down onto her back, spreading her legs and presenting herself to the panting Derpy, making her cock harden further. “Come on girl, just a little closer.” Trixie cooed.

Derpy was nearly to her Mistress when, because of a particularly rough thrust from Muffin, she fell back onto all fours. She didn’t let it stop her, though, as she kept going towards Trixie as best she could. Finally reaching her, she shakily aimed the tip towards Trixie’s marehood, looking up at her face for confirmation. “Go ahead.” Trixie stated, waiting for something that might take a bit more to actually happen. “Well? I’m waiting.”

Roughly, Derpy tried to shove her hips forward… but nothing happend. She tried again to no avail. Just as she was about to give up hope, Trixie spoke up. “Oh Muffin, why don’t you give her a hand? It would help get me off.” Trixie hummed. Muffin’s pupils seemed to dilate at those words, her arms wrapping around Derpy’s waist and quite literally thrusting for her, the two identical ponies moving at the same time. As Derpy slid into her mistress, both her and Muffin felt a surge of pleasure, and release…

“Woof?” Derpy barked questioningly.

“You deserve a break. Let her do the work for you.” Trixie breathed, her legs spreading further. “Well Muffin, you want release, Make me cum!” She commanded.

Derpy did as her Mistress commanded, relaxing and letting Muffin do all of the work. Muffin, on the other hand, went into overdrive, thrusting into Derpy and, by extension, Trixie, as fast and hard as she possibly could. With every movement, Derpy’s belly gurgled, the hot cum inside of her sloshing around her stomach. Trixie’s eyes rolled back, falling from character as a long awaited pleasure started to rise through her body. “That’s a good doggy!” Trixie babbled. Along with her, Derpy’s shaft began to throb, the pegasus feeling her own orgasm beginning. Trixie’s legs kicked forward, now trapped beneath the two lustful ponies as their orgasms slowly started to come to fruition, their sex drives now taking full control.

Muffin thrust harder and harder into Derpy/Trixie, the rising pleasure giving her extra energy. This forced Derpy’s cock further into Trixie, until finally, her tip bumped into her cervix, and her knot into Trixie’s entrance. Feeling resistance, Muffin pulled back as far as she could and rocketed forward, punching into Trixie’s womb like an arrow, and locking Derpy in by her swelling knot. Trixie yelped and screamed, thrashing about from the initial pain, but continuing from the waves of pleasure from each throb. Muffin’s thrusting only grew more relentless, each thrust causing the two below to moan and gasp. Trixie’s orgasm was nearly there, but was just below a pleasure-locked Derpy as cum started to physically bulge the meat socket her cock was lodged in outward. Muffin’s genitals had swollen substantially, practically frothing at the mouth as she witnessed Derpy’s orgasm.

“Aaaaah!” Both of the pegasi screamed. Trixie’s mind blanked, going crosseyed momentarily at the feel of magma-like cum filling her mostly empty womb. Muffin’s entire body seized up, as if something in her brain seemed to click. Almost immediately, Derpy’s stomach began to swell out once more, bumping and squishing into Trixie’s own expanding womb. Trixie was absolutely out of it, her limp body giving an occasional twitch with each forceful pump of cum.

Derpy felt strange, and breathing had suddenly gotten a little tough. She could feel something rushing up her throat, almost like vomit. What came out, though, was obviously not bile, instead some white and sticky liquid… in a surge of thought, she realized that Muffin had came so much inside of her, that her load had made it’s way through Derpy’s entire body- and then some. Eyes rolling up into her head, Derpy gurgled through the thick, white waterfall that poured out of her mouth and all over Trixie’s body.

“I don’t… no words…” Trixie mumbled, her words barely audible over the many other sensual sounds washing through the room.

“Baaaark.” Muffin moaned out, hips still shaking from the senses-overloading orgasm she was having. Derpy just continued to gurgle and slosh. Trixie grudgingly crawled back, causing Derpy to give a wet whimper as her cock slipped free. She went limp a few feet away from the two, leaving Derpy to her seemingly endless fate.

“I’m just… gonna leave you to it. See you when I wake up.” Trixie’s voice was groggy and weak, resting her head on the soft, comfortable wood floor.

“Gllphng…” Derpy’s eyes glazed over, slumping down onto the ground and bringing Muffin with her. The two of them knew they were most likely going to be there for awhile. A looooong, while.