Twience Gone Wrong

by Third Wheel

Rating: mature
Tags: Twilight Sparkle (EqG), Anthro, Other, Equestria Girls, Porn, Spike (EqG), Sex, Fetish, Sunset Shimmer, Twilight Velvet, Non-consensual
Length: 12340

Twilight forgot to account for Spike's biological needs when making him a partner. Twilight forgot to account for rogue Equestrian magic when fixing that mistake. Spike ended up enjoying the consequences of the latter, and Twilight too eventually.

Twilight built Spike what was supposed to be the perfect robotic partner. Twilight, being a nerd with even less interest in sex than in sports, forgot to account for certain aspects of partnership. Spike, understandably, took issue with that, and asked her to fix her mistake, more than a little pissed with her. An accident with Equestrian magic and a while later, all their issues would be resolved, and their opinions of each other would have changed as much as their bodies.

Chapter 1 features: gratuitous dog genitals, verbal degradation, technically cheating and debatably orientation play (ace to hypersexual), magical body modification, size growth, ball growth, ass expansion, breast expansion, lip expansion, intelligence loss, bimbofication, licking, leg growth, cock growth, size difference, muscle worship, cock worship, blowjob, titjob, knotting, large insertions, huge loads, excessive amounts of precum, cumflation, cum eating, pet-owner relationship fetish, role reversal, collaring, room temperature superconductors, interspecies, maybe bestiality depending on how you define it, doggy style sex, claws, nail growth, musk kink, genital grinding, drooling, maledom, femsub, monsterfucking, no refractory periods, mental alterations, hair growth, fangs, objectification, minutes long cum streams, impregnation
Chapter 2 contains: most of what chapter 1 does, pregnant sex, multiple dicks, multiple tits, multiple balls, hyper pregnancy, mentions of incest, mentions of mind break, huge size difference, gender bending, lactation, anthro dogs, robotic anthro dogs, multiple heads, anal, harem, sex with multiple partners, throatfucking with a tongue, tongue fucking, eating cum out of another girl's holes, doggirlification

Written as a Patreon request.

Cover art cropped from image number 1517757 on Derpibooru, by thebrokencog.

Published 2022-10-30 21:10:01 UTC
Last updated 2022-10-30 21:10:01 UTC

Gone Sexual

Spike lay lazily on top of the desk, wearing the little labcoat and goggles Twilight had forced on him. He rolled around, staring away from the picture of Timber Spruce Twilight kept in her laboratory, and eyed the girl still kneeling down and working on her machines. "Will this take much longer?"

"A bit, Spike," replied Twilight, setting aside a wrench and picking up a screwdriver. "You can't rush science. Especially not science as complicated as this!"

Spike scrunched up his nose. "Yeah, sure, whatever. But you could at least be quick about it. This whole thing is your fault, after all!" He lifted one of his hind legs and pointed with his forelegs at his crotch, displaying his erection.

"I know, Spike," Twilight said. "And I'm sorry. But it's not like I could have known-"

"How could you not have known!?" Spike barked. "You built me a partner and you forgot to outfit her for sex! That's like the one thing a dog like me needs a bitch for!"

"Spike! Language!" hissed Twilight.

"You'll get to lecture me about language when you've made up for giving me blue balls," Spike replied.

"Giving you access to the Internet was a mistake," Twilight said, mostly to herself. She focused back on Ro-Barb's body, lying half-disassembled before her. She wasn't exactly proud of the way she'd made room for a male masturbator on the back of the robot's body, or of the fact that she'd had to buy a dog-themed one in the first place, but those were only aesthetic problems. She could ignore them and fix them later.

The more delicate part of the project was what she'd put around and inside the toy. Aside from the pistons to regulate tightness, which had been pretty easy to figure out, she'd also installed a set of sensors meant to replicate the nervous system, and she'd wired them to a newly built unit she'd added to the cinoid's core, meant to process sexual pleasure. Looking up brain scans of a dog's orgasm had been an experience she did not wish to repeat.

Problem was, she had no idea if it would work out or not. She could do all the research she wanted, but without tests she would never know what the results would be. And simulations would take time, even assuming she could set up proper ones. It would take at least another trip to the dark corners of the web to get proper visual references on dogs' mating process she could take data from.

And so, the only thing she could really do was make sure she'd assembled everything properly, let Spike have a go at it, and hope Ro didn't blow up or shut down from overload. She had backups of everything, just in case, but Spike would not be happy about it. She really didn't want him to be unhappy. With a sigh, she began reassembling her creation.

"Are you finally done?" she heard Spike ask from behind her.

"Almost," she said, screwing on a section of Ro's face plating. "Just a few minutes."

"About damn time," said Spike. Twilight didn't have the heart to reply to that. She couldn't understand what he was going through, but it was probably very painful. He went on, "I still don't understand what you were thinking. And you even stopped to daydream about Timber while building her, how did you possibly forget the sex parts!?"

Twilight blushed heavily at that, and almost stabbed her hand with the screwdriver. "Spike! My relationship with Timber is nothing like that!"

There was a sound, and Twilight had to actually turn around to confirm it was Spike laughing. She wished she hadn't, as it forced her to see his erection again. "What?" she asked, adjusting her glasses.

"Nothing like that, huh? Are you sure you didn't forget to tell him about it?" asked Spike, wriggling his eyebrows.

Twilight pursed her lips, offended. "I'll have you know there is much more that goes into a relationship than sex. Sex is just a superfluous bonus some people enjoy. My relationship with Timber is purely a matter of love, and I have no plans to change that."

Spike rolled his eyes and failed to hold back a chuckle. "Seriously? Come on, Twilight, stop lying to yourself. Humans are still animals, and you're not a child anymore. You all want to breed. Just look at your friends!"

Twilight rolled her eyes as well. "What my friends get up to is no business of mine, and no business of yours for that matter. I know what some of them are like, I'm not that clueless. But I'm not like that. Sex just feels like it would be a waste of time, honestly."

"And have you talked with Timber about this?" Spike lifted his eyebrows, devilishly smiling.

"As a matter of fact, I have," replied Twilight, turning back to finish reassembling Spike's partner. "He's fine with it."

"But is he really?" Spike went on. "How do you know he's not just lying to you, hoping he'll get you to change your mind? Trust me, I know what guys are like. You really expect him to hold back his instincts?"

Twilight audibly groaned as she tightened a screw. "You're only talking like that because you're sexually frustrated. Better get this thing over with as quickly as possible so you go back to being tolerable." And she did believe that. She gave another look at Ro-Barb's body, double checking everything. "I think I'm done here, actually. Now to power her back up again."

Spike perked up, tail wiggling from side to side, panting as a dog would. His sapience and his condition made it look rather more awkward than it usually would have. Twilight's words came to slash down his enthusiasm.

"This might still take a while. There's a chance I need to reset the parameters on the machine," the girl said, as she carried the robot's body to the metal contraption she'd first emerged from.

Spike frowned, disappointed. "Can't you just turn it back on? How hard can that be? Why not just add a switch?"

Twilight blushed a little, shifting from foot to foot as she closed the door to the machine. Fidgeting with the edge of her labcoat, she explained, "Well... I might have reverse-engineered some bits of Equestrian magic infused technology along the way. So I'm not actually one hundred percent sure this'll work on the first go."

Spike threw her a piercing glare.

"What?" the girl said. "If I'd actually figured out how to recreate accurate animal intelligence in an artificial vessel I can assure you I wouldn't still be running experiments in my garage." She paused. "That and this thing drains energy like a leech, without any incoming lightnings I'll have to hope the generator holds."

"The generator which almost fried the entire house's electrical network because it was too powerful the first time you tried it," Spike flatly said. "Why are you still doing experiments in your garage again?"

"That one is technology too dangerous to put it out there. It would be used for weapons before it solves any electrical crisis."

"And I have to assume that's the same for the room temperature superconductor you discovered, the quantum processor prototype you made last week, and all the science projects you worked on while at Crystal Prep and were close to finishing, right? You know, I'm starting to think you just don't want the fact that you're abnormally brilliant get out there out of fear that it will lead to you having to leave your newfound circle of friends and-"

"Dog pussy? I think we were talking about dog pussy here." Twilight tapped on the control panel, just a little too violently.

Spike sighed. He couldn't argue with that, especially not with his raging hard-on. Together, they both watched as the machine slowly hummed to life, waiting for the outcome.

"Honestly, none of this would have happened if you'd just let me fuck Winona," Spike commented.

"We've been over this already." Twilight pinched the bridge of her nose. "She's Applejack's dog, and Applejack doesn't want to deal with puppies. You can't just go mess up their lives."

Spike rolled his eyes. "Come on, she was practically begging me to breed her. I know how to tell when a dog wants something, and that bitch wanted my dick."

Twilight's reaction was a long inhale, followed by an equally long exhale, as she rubbed her eyes beneath her glasses. She threw one more look at the machine, but things were still moving slowly on that front.

"What about Thunder Guts?"

Twilight turned towards Spike. "That's even worse. You barely knew her, and we're probably never meeting Supernova again. You can't fuck a girl you just met and leave her pregnant while you go on with your life."

Spike huffed. "I say that's bullshit. If nature made me capable of breeding more than once I don't see why I should stick to one partner."

With both Spike and Twilight focused on their discussion, neither of them noticed the tiny wisp of magic floating in from the window, and drifting into the machine.

Twilight saw the readings shoot up, but didn't have time to even yell. There was a flash of light, and a piercing high pitched sound that filled the room. Both the girl and the dog were pretty sure they'd been hit by something, though they couldn't quite tell what, and they came back to clarity on the floor.

"What the fuck was that?" Spike yelled.

Twilight rushed to the nearest control panel. "I don't know." She looked at the screen, then back at the machine. "Everything seems okay though. It's like it short-circuited, and shut itself down as a safety measure. I'm assuming that thing we saw was a magical discharge it chose to put on the outside. Are you hurt?"

"The only thing hurting are my balls from how full they are, so you better get this thing going again," Spike replied. He looked himself over. "Speaking of which, were they always this big?"

Twilight ignored him. "I need to figure out what went wrong before we try again. Let me just..." She paused. Her eyes scanned the screen, and she put a hand to her head. It wasn't like she didn't know what to do, just, she couldn't quite put her finger on it. Her eyes scanned the readings over and over. She knew what they were saying, she knew what everything meant. But for some reason she couldn't quite focus on it. Like reading a line from a book, then forgetting what it said. "Hold on, I think I need a moment." She pulled on the edge of her pants, which suddenly felt uncomfortable around her waist.

Spike shrugged off the little labcoat he'd been wearing. It felt a little tight, and a little too hot as well. He stumbled a bit as he tried to move. "Okay, maybe I'm not too alright," he said, looking around. It felt like his head was spinning, like everything was slightly off. And his erection didn't make things better, it was starting to physically hurt.

Twilight sat down, and took off her glasses. "Did the heating get turned up by accident?" she asked, letting her labcoat slide off her shoulders and fanning herself. "Let me check." Despite saying so, she didn't move. "Where was the heating system panel?" With her other hand she rubbed against her chest, which felt oddly uncomfortable.

Spike stepped towards Twilight, still on wobbly legs. "How long will it take you to get her running again?" he asked. His claws scraped against the floor as he walked, each step heavier than the last. He felt short of breath, he was panting, his body felt heavy. "You know what, just pull her out. I'll just use the toy. I need to fuck something." He brought a paw to his neck and unlatched his collar, so he could breathe a little easier. It fell to the ground. For some reason, he felt a lot better about no longer wearing it, and stepped over it without much thought.

Twilight kept fanning herself with a hand. "I... I mean, sure, I can do that," she said. She was secretly glad Spike had asked for that, because by goodness she had no idea what she actually needed to do to get Ro-Barb running again. Try as she might she couldn't focus on anything at that moment. She needed some rest. She got up from her chair, pulling at the edge of her pants again, and went to open the machine.

Spike stared as Twilight pulled and pushed on the door, but the machine remained closed. She tried the control panel, the handle, everything, but nothing seemed to work. The girl squatted down in front of it, a finger on her lips, trying to figure out what the problem was. "Could you get a fucking move on?" the dog barked.

"I think it's stuck. Or something," Twilight replied. "Must have been the power discharge, and stuff. Maybe we shouldn't open it yet. There could be, like, bad stuff inside, because..." Her sentence trailed off into a series of hums, as she squinted and tapped her head, trying to remember what exactly she was thinking and talking about.

Spike began to growl. Stupid bitch. First she forgot to give him a bitch with a hole to fuck, and now that she'd actually added that hole she'd locked it away and couldn't figure out how to get it back. And he was stuck there waiting, staring at her ass, that round, fat, juicy ass that stretched the fabric of her trousers and threatened to spill out at any moment, the top of it visible as she bent like that. Like a bitch in heat waiting for him. Spike blanked out. When he regained awareness, he had his face almost pressed against the machine, and something was pushing against his underside.

Twilight felt something suddenly collide with her backside, and the impact pushed her down on all fours. Something large, warm and soft was against her back. Hot breath tingled her ears, coming from above her head. Two large, muscled and furry purple legs flanked her vision, ending in large paws with long and sharp black claws. And something long, large and hot had pressed its way between her legs, forcing her thighs apart, and was now pressed against her belly, soaking up her clothes in whatever fluid it was covered in.

She looked down underneath herself, but couldn't quite tell what she was looking at. Her chest was in the way, covering most of what there would have been to see. Then she looked up and behind herself instead, moving forward a little to get a better idea of what she was seeing. It was a purple animal, it kinda looked like a dog or perhaps closer to a wolf. Pretty big, and very muscled. She still wasn't quite sure of what the thing between her legs was. She did find the creature rather nice to look at, though. "Spike?" she called out. "What's this thing?"

Spike, hearing Twilight call for him from somewhere clearly below him, stepped back in confusion. He had to bite down to hold back a moan as his cock slid out from between her legs. "Twilight?" he asked, looking at the girl. He still wasn't quite used to the height of his legs.

"Spike?" Twilight looked around, confused. "Where are you, Spike? And what's this thing here?" She turned around, still on all fours. She opened her mouth to speak again, but left it hanging open as her eyes focused on Spike's cock, now bigger than her forearm. A line of drool dribbled down from the corner of her mouth.

"I'm here, you idiot," Spike barked. He noticed his voice had gotten deeper than usual, and maybe a little rougher as well, but didn't really care for it. "The fuck did you do?"

"Uh?" Twilight finally closed her mouth, and looked up towards Spike's face. "Spike? Were you always this big?" There was a subtle ripping sound following her words, but neither seemed to notice.

"I don't know. Were you always this dumb?" Spike growled. He began to move towards Twilight again, his steps heavy against the floor. "Just open that fucking door so I can... Fuck!" He grit his teeth in frustration. "Can't even fuck the toy like this. Cock too big for it."

Twilight lowered herself a bit to get a better look at the item in question, mashing her tits against the ground. There was another, slightly louder sound of fabric tearing. She giggled.

Spike looked at her. "Laughing, bitch? This whole thing is your fault." He began to growl, angrily stomping back and forth. "Too big to even fuck those other dogs now. Maybe that stray bitch Ember at the junk yard. Don't give a fuck you don't want me to fuck strays. I could show her, always acting bossy and leading that pack. Fuck her into her place." He kept muttering to himself, his cock still as stiff as ever.

Twilight moved to a sitting position, and put a finger to her plump lips. Her other hand began aimlessly twirling her long hair, and she looked at Spike, mesmerised by the muscles bulging beneath his wild fur. "You're, like, right that this is all my fault," she said after a while, cutting into Spike's musings.

"So what?" Spike snapped in her direction. His sharp teeth bared, he glared at the girl with primal rage in his eyes. "I know I'm right. You fucked up! What you gonna do to fix it?"

"I could, like, suck you off?" Twilight candidly offered, still twirling her hair. "Since you need to relieve all that pent up tension and stuff. And it's my fault you can't fuck your toy. So I can just suck your cock." She smiled at Spike, like it was the most normal thing in the world.

Spike stared at her, dumbfounded. "Suck my cock?" Something was at work in his brain, gears slowly twisting and clicking into place, but he was at that moment still at pause, processing Twilight's suggestion.

"Yeah." Twilight lowered herself a bit again to look at Spike's cock. She frowned. "Is there, like, something wrong with it or something? I... You don't mind if I suck your dick, right?" She ran her tongue over her fat, bulging lips. "It looks so yummy. Those balls must be so full of cum."

What had been shifting into position inside Spike's head finally snapped into its destined state, and he felt as if a jolt of electricity had shaken him out of a stupor. His eyes trailed over Twilight's body, from her wide hips to her large tits straining the fabric of her clothes, to her dumb expression and the line of drool dribbling down the corner of her overinflated lips. Lips that were only good to suck cock and nothing else.

He felt his shaft twitch, and his legs began to carry him forward without him needing to think about it. "You right," he said, in a low and guttural tone. "You bitch blue-balled me long enough. Bitches are for fucking. Suck my cock." His vision was foggy, and his thoughts jumbled. The only thing he could focus on was the overwhelming desire to feel Twilight's lips wrap around his dick, the need to fuck her face and feed her his cum.

Twilight giggled again, and went back on all fours. The back side of her pants tore open, freeing her large ass, and as she crawled towards Spike they slowly fell off her. Once she reached the beast, she ducked beneath his chest and placed herself face to face with the tip of his cock. Placing one hand on his balls, and the other to her nethers, she breathed in the smell of his shaft. Her vision blurred, her mind fogged, and for a moment she almost passed out. Her pussy clenched, soaking her underwear.

Sensing the girl's hesitation beneath him, Spike thrust forward with his hips. The tip of his cock slid into Twilight's mouth, past the velvety cushions of her full lips, and onto her tongue. The taste of it was electric to the girl, and immediately sent her into a frenzy. The hand that had been toying with her sex through her drenched panties moved up to envelope Spike's dick, too large for her to wrap it all the way around. She began to jerk him off with one hand, massage his balls with the other, and bob her head up and down, swirling her tongue around the tip.

Spike howled in pleasure. After so much time spent being denied release, the stimulation from Twilight's body was heavenly. The way her hand wrapped around his shaft and ran over it, the way the other worked on his balls and made them clench and shift around. And her lips around the top of his dick, so soft and warm and smooth as they enveloped him.

Feeling it wasn't enough for him. He needed to see it too, he needed to see Twilight as she sucked him off and wrapped her hands around his cock. Without warning, he placed one of his large paws behind Twilight's head to hold her there, then let himself first shift to a sitting position and then partway onto his back, partway lying on his side, so he could see full well the girl working on the entire length of his shaft as she kneeled between his spread legs.

Twilight felt herself pulled into the new position by Spike, completely unable to resist his strength. From where she ended up she had a perfect view of the beast's body, in all its evident strength and power. And of his massive cock as well, so thick she would have needed two hands to fully wrap around its girth and so long it went up to her nose despite starting at her belly button. She gave up sucking on the tip for a moment, and worshipfully dragged her tongue and inflated lips all along its length. Her hands meanwhile wandered over Spike's body, feeling the muscles underneath his wild fur and giving Twilight a rush of excitement down her spine. She was so powerless in front of the creature, he could do whatever he wished to her if he chose to.

Her downwards trek along the length of Spike's massive cock ended at his equally well endowed balls. Across from the start of one to the end of the other they could have fit her entire head, and even one by itself was quite enough to cover her mouth, nose, and eyes. And she had no hesitation in doing just that. While her hands above travelled back to begin massaging Spike's shaft, long and glossy nails sliding through his tangled fur before reaching the base of his cock, she pressed her face to his ballsack and let herself drown in sensation.

Her entire vision obfuscated, she took in the powerful smell of his virility and immediately went dizzy with it. Her lower lips were leaking, and so were her upper ones, as she began to kiss and lick every inch of the animal's balls with obsessives devotion. The taste was wonderful, driving her more and more into a frenzy to get as much of it as possible. She could almost feel all the cum sloshing inside them, and the thought of it sent her down her next course of action.

She began to slide her face upwards again, tongue still fully pressed against Spike's dick and leaving a copious trail of saliva along the way that mixed with his pre and made the sliding of her hands along his length even more pleasurable for the canine. She finally reached the top of his cock, and there she spread her plump and thick red lips and took as much of it as she could into her mouth. Her jaw had to open wide to fit it all, but she was happy to do so. She bobbed her head up and down, swirled her tongue around, and jerked off Spike's cock with both of her hands.

Spike groaned in pleasure, throwing his head back. The girl's hands were amazing around his dick. Way better than his paws could ever be. And actually seeing her there as she sucked him off, the dazed expression on her face, her clothes ripped and revealing parts of her massive chest, it was way better than any porn video he'd ever watched. Way better than dogs, for sure. Why the fuck had he ever wanted to fuck a dog when he had such a good bitch at his disposal all along?

His balls felt like they were pulsating, closer and closer to release. His entire shaft tensed, forcing Twilight's head up and making her strain her neck a bit, her spine and her legs getting straighter to allow her to still reach the tip of his cock. He was so near to his climax, but it still wasn't enough. He didn't just want to see Twilight suck his cock. He needed to fuck her, he needed to see her submit to him like the horny bitch he knew she was. He began to thrust upwards with his hips in tandem with Twilight's motions, and placed a paw on the back of her head to force her down on him.

Twilight felt Spike's paw press down on her head, his sharp claws sliding through her long hair and forcing her downwards towards the rest of his massive cock. She began to choke on it, but didn't fight back. She couldn't fight back. Spike was too powerful, much stronger than she could ever be. The feeling of how easily, how effortlessly he bent her, like a storm bending a blade of grass, made her simply ecstatic. Her nipples stood hard against her clothes, her bra having already snapped and fallen out of place, and her panties at that point were translucent and completely soaked in her arousal.

Seeing the girl submit to him, helplessly moaning around his cock as he forced her down on it, finally pushed Spike over the edge. With one last thrust of his hips, and placing both of his paws over the back of her head, he crammed as much of his dick as he could inside her mouth and the start of her throat and finally erupted into her. Days, weeks of pent up sexual frustration exploded into a torrent of cum, as his balls clenched and his shaft pumped out rope after rope of thick hot semen.

Twilight felt herself practically drown in cum. It flowed into her faster than she could possibly swallow it all, and soon it was filling her mouth and dripping past her cock-sucking lips and over her pretty face, down onto her overgrown chest, soaking through those few straps of brave fabric that hadn't yet been torn asunder by her giant tits. More of Spike's cum kept flowing, up her nose and then out of it, cutting off her ability to breathe. Not that it mattered much, the thought of what she was going through was already enough to make her head spin and send all her thoughts crashing into a wall. There was space for nothing inside her head but the pleasure of being forced to submit to her alpha.

She blacked out. Whether by lack of air or by the sheer shock of all the pleasure she was feeling, she wouldn't have been able to tell. She came back to her senses a moment later, still dizzy, the upper half of her body covered in Spike's cum and the lower one just as drenched in her own juices. She'd cum like a fountain, if it had been while still conscious or while passed out on the floor she didn't know. She didn't care. The one and only thing she cared about at that moment was scooping up every last drop of her partner's cum and eating it. Slim fingers ran over the full curves of her chest, thick and glossy red lips smacking as long, polished nails pulled back from them.

Spike watched the whole thing with a half grin on his beastly muzzle, too amused by the scene to interrupt it just yet. Twilight sat there, in a puddle of her own juices, lapping up on his cum without a care in the world. It almost looked adorable, though much more than that it looked hot. He was rather happy to have himself a bitch who knew how to appreciate what he could give her. But Twilight was maybe a little too distracted by his seed, when she should have been focusing on the source of it instead. Still hard, still not done with her. Spike growled out a wordless call, in a deep and raspy tone.

Just as she'd finished lapping up all the delicious cum from her fully naked body, having removed those few pieces of torn off clothes that still clung to her skin due to all the sticky fluids she'd been covered in, Twilight heard something else. A sound that immediately triggered a reaction in her mind, as her head snapped towards its source. How could she have been so foolish? How could she have forgotten about the reason itself for all the joy and pleasure filling her? How could she have gotten so caught up in her activity that she'd forgotten why she was there?

The girl looked at Spike, sitting on the opposite end of the room. His muscled body, covered in wild purple fur, stood taller than she'd have been while on two legs. That she was on her knees made him seem that much bigger, but then again that was where she belonged anyway. Hints of his long, sharp fangs could be seen on his muzzle, itself halfway between a wolf's and a bear's yet a bit more squared and longer than both. A bit like a horse's, really, if horses were fierce meat-eating predators. But to be fair, the only one doing any meat eating there would be her.

And as she thought of that, Twilight's eyes wandered to Spike's crotch. Even a horse would have been put to shame by that, the thought of comparing a human penis to it was laughable. It was bigger than even a person's leg, thick as a tree's trunk, hard and veiny and throbbing and just begging for her worship. And that knot near the base, it was almost as big as her tits were. Was it? She looked down at herself. No, it was definitely smaller. For some reason she'd thought her tits were smaller than they actually were. That didn't matter. Slowly, obediently, she began to crawl towards her Master.

Spike looked with pleasure as the naked, cum-drunk bimbo approached him. Her fat tits dragged against the ground as she moved towards him in all fours, leaving behind a trail of translucent juices that came just as much from her cunt as they did from her mouth. She was slobbering like a bitch at the sight of his shaft, and panting like one too. He himself felt a fair bit relieved by her previous servicing, in so far as it had lifted the fog of overwhelming lust clouding his thoughts, but that still wasn't enough. No, after tasting the pleasure she could give him he wanted more. He didn't physically need it as much as before, but he saw no reason not enjoying her submission when he was still more than ready to go.

Twilight reached the monstrously tall and muscled body she was so attracted by, and immediately her face was once again buried in his balls, tongue lapping at them, hands kneading them, inhaling their scent and short circuiting her brain with it. It was all she needed at that moment, all she could consider wanting in her hazy mental bliss. But Spike, if he enjoyed her worship greatly, still had other plans for her. Her grabbed a pawful of her long, luscious hair, and simply pulled up until her eyes were looking into his. Twilight was bothered for just a moment at being separated from his nuts, but the instant she realised what was happening she was happy again. There was a primal, instinctual, strong and deep reaction somewhere in her brain, something that made her feel happy whenever she was obeying. Like it was right and perfect for her.

Spike took a moment to appreciate the way she hung limply and without resistance and the absolutely dumb, lust-crazed look on the girl's face, from her glazed eyes to her tongue hanging out over her open dick-sucking lips and drooling down on her chest. And it was exactly that chest that he was interested in. Those fat, heavy tits jutting forward and rubbing against his shaft as he held the girl there, round and smooth and soft yet pleasantly firm when pushed against, just the right amount. Tits that were made to wrap around his dick, and putting things where they belonged was something he was taking quite a liking to.

"Hey," Spike called. Twilight's attention snapped to him like a magnet being released, her eyes glued themselves on his face, his feral expression, his animal features. Pure longing and devotion filled her heart in a way she couldn't describe, a deep certainty pervading her and informing her that she was to listen and obey to everything he said. She silently awaited his words, aware her turn to speak would only be when requested, aware that following what he would ask of her would bring her pleasure and fulfilment. Mostly pleasure though. Even without all that, she still would have obeyed him just for how mind-blankingly potent the orgasms he could give her were. "Put those tits of yours to use," he growled at her.

Twilight didn't think twice about it. She didn't think once either, actually, her body just moved according to his command as her brain directly and unquestioningly processed his words faster than her conscious mind could perceive. She hefted up her beach-ball sized breasts, her hands sinking into their flesh as she pushed on them, and wrapped them around the full width of Spike's cock. The shaft was massive, large enough to cover her whole vision up close, and if she hadn't been reduced to a dumb pleasure-drunk leaking bimbo slut by then she would have been wondering how she'd ever fit it into her mouth when it was so much bigger than her neck. In her state however, a faceful of canine cock just made her pussy drip and her mind sizzle with sparks.

She began to press her boobs together, enveloping Spike's dick, meanwhile pressing her face and huge lips against it and drooling all over it and inhaling its scent. Lubricated by her drool both new and old and by the magically overgrown dog's pre, her tits began to slide effortlessly up and down while Twilight moaned into the cock she was worshipping and left yet another puddle of juices on the ground. Spike threw his head back and gave a deep but quiet howl. Twilight's tits felt simply divine, and he could feel his balls and the base of his shat contracting, his entire crotch area throbbing and getting ready for another release. The stimulation of her soft, warm skin on his cock, still excited from his previous orgasm, was driving his lust up to mind-numbing levels again. The need to cum and the pleasure of being serviced by the girl were overtaking everything else, pushing him into a frenzy.

He began to thrust up with his hips to meet Twilight's motions, sliding the whole length of his dick between her breasts, fucking the tight crevice between her overinflated yet perfectly shapely tits and slamming his own watermelon sized balls against them. As he slid to the lowest point he would catch glimpses of her face, a mask of lustful delirium, eyes rolled back, tongue lolling out of a pair of lips that could only have been created for the purpose of pleasuring cock. Just like her tits, bigger than her head, just like her fat and perfectly rounded ass, just like everything about her. Just like her. She was a fucktoy, a sex doll meant to please her owner, and she was his fucktoy. And he needed to fuck her.

Spike barely held back a howl, growling and moaning through gritted fangs as he tensed his neck and stopped himself from cumming, still dripping out pints of pre down the length of his shaft and onto Twilight's body. He stopped thrusting, but still had to bite down on his teeth as Twilight kept stroking his dick. "Stop that, you braindead slut!" he barked out, and Twilight did. She didn't mind the insult, she barely comprehended it in fact. All she understood was a command, and the joy that came from obeying it.

Spike felt slightly less joyful than his puppy did. His thoughts were still glazed over with primal lust, but he had to stop and tell the dumb bitch what to do to actually get what he wanted. He mentally decided he'd have to train her properly at some point, to get to enjoy her without interruptions. Not right then though, he had other things to enjoy first. "Mount me, you dumb cunt," he ordered in a low voice, hoping the girl would understand what he meant.

Thankfully, even if Twilight's usual smarts had dropped through the floor her sexual knowledge had noticeably spiked. If he'd been able too look into her head, he'd have thought she'd somehow downloaded several archives' worth of porn into her brain. He wouldn't have found much else in there, but then again a fucktoy hardly needed anything else so long as she still remembered how to eat and breathe. "Yes, Master," she said in a honey-sweet tone, drawing back and giving his cock one more kiss before crawling on top of his wide, sculpted chest. She placed both hands on his pecks, and placed her firm ass against the upper side of his dick.

"That's a good girl." Spike, lying on his back and partly against a wall, leaned his head forward and kissed Twilight's lips, which effectively amounted to softly biting her cock-pillow lips and forcing his tongue through them. He ended it by drawing back and giving her whole face a lick, marking her with his saliva. "You might only be good for fucking, but at least you're good at it."

"Yes." Twilight felt a shiver of ecstasy shoot down her spine at being praised. She arched her back and dragged the curve of her ass all along the length of Spike's cock, until her long legs were fully stretched and she reached just past his tip, just enough to push back and have her pussy hovering there, rubbing against him, dripping down a river. "I'm your good little bitch only good for taking your cock," she said, moaning the words out, and she bit down on her plump lips in pleasure a moment later as her words made Spike's cock twitch and spread her pussy. She smiled at him, eyes wild with lust, and prepared to simply let her legs stop supporting her weight. "Please, take me. It's the only thing I'm good for."

The moment Spike's cock twitched again, Twilight's slender legs gave out. She wasn't sure if it was out of her own decision, or out of pleasure making her lose control and forcing her knees to fail her. A moment later, she couldn't care either way, as her whole mind was as filled by the knowledge of what was happening to her as her pussy was completely stuffed by Spike's shaft. Between her leaking, his precum, and her fucktoy anatomy, almost his whole length slid into her in a single go, spreading her pussy wide and leaving a visible bulge. All that was left out was his knot, which her open thighs rested on top of.

Spike had never felt anything that good. No amount of humping, jerking, or anything else he'd done to try to relieve himself could have prepared him for how incredible the inside of Twilight's pussy felt. It was better than he'd ever dreamed, the slightest twitch or thrust dragging over the entire surface of his cock and sending electric pleasure all the way through it and all the way up to his brain. He felt his instincts, his primal lust take him over once again as the pleasure consumed everything else, and he began to grunt and growl as he thrust into Twilight, his tongue lolling out of his mouth.

Twilight was in a world of utter bliss of her own, needing to do nothing else but let Spike use her and receiving moment after moment of pleasure so intense it was like a hammer slamming against her brain with every thrust. She groped her huge tits and played with her nipples, but it was more out of an instinctual want to give her partner a show than a need for any more enjoyment, the sensation overtaking her already so intense and overwhelming that any added stimulation didn't even register. Just as instinctually, words began to pour out of her mouth, words learned she didn't know when or where or how, her only certainty about them the fact that they would please her Master.

"Fuck me," she begged, she babbled out, as unsure of whether she was actually speaking or just moaning incoherently as Spike, in his breeding frenzy, was unsure of whether or not he was hearing her. "Fuck your bitch. Breed this fat-titted bimbo slut, claim me. I'm a good for nothing cocksock whose only purpose in life is being a toy for you to relieve yourself, a dumb set of holes for you to cum in, a doll who exists for you to empty your balls in and on her. I'm yours, your toy, your property. Use me. Use me until you're satisfied, cum in me and fuck me and jerk yourself off with my body. My slutty sexdoll body only exists to please your magnificent cock, so please reward me with your cum, Master! Give your obedient bitch her reward for being a good slut!"

Spike wasn't sure if it was anything in particular about what Twilight had said or done, or if he'd simply reached the breaking point of his pleasure. What he was sure of was that something inside him had snapped, his brain was alight with breathtaking clarity and his cock was shooting burst after burst of thick canine cum into Twilight's sex, bloating her before his eyes, and the only thought echoing in his head was his need and want to cum. "Take it, bitch," he said, barely a growl.

He kept spurting inside the girl, feeling her belly bulge out over his abs as he filled her and hearing her owl in mindless pleasure, but at some point through it something else awakened in him. Something deep and primal and stronger than everything else. He didn't just need to cum, he needed to breed her. Acting on pure instinct, her raised himself up, and with his cock still inside her he flipped her over. With her fat tits mashed against the ground, he mounted her and began to pound her through his own orgasm, still ejaculating.

He thrust into her with animalistic frenzy, huge balls slapping against her growing belly, his claws reaching down and squeezing her tits and hooking into her mouth and grabbing her hair as he pressed himself over her back and kept slamming his knot into the outer walls of her pussy, the stream of cum from his cock refusing to end and leaking out whenever he drew back to slam forward again, multiple times a second. Twilight's mind was completely flooded, without even those previous moments of lack of intensity, her eyes rolled back and her open mouth drooled out a river and her knees only held her thighs up because they had nowhere else to go.

Spike thrust and pulled and bit her neck and came and fucked her and slobbered over her back and grunted and growled. Finally, with one last powerful thrust, his knot forced its way past Twilight's lower lips. Something clicked inside Spike. He howled, forcing Twilight down with both paws as he raised himself above her, while his knot flared even wider inside her and his spurts melded into a single stream of cum jetting out of his dick and bloating her belly, completely trapped there by the widened base of his member lodged inside her.

It took a while before things calmed after that. The stream of his cum only stopped minutes after, and by the end of it Twilight looked pregnant with more than one litter, and about ready to give birth. His senses slowly came back to him and he drew back, grunting in pleasure as he felt the edges of Twilight's pussy drag and hold onto his shrinking knot while he extracted himself from her. After that he stood on all fours, looking at the girl lying in front of him.

Twilight got up a couple of moments later, head dizzy and looking like a mess. Staying on her knees she wordlessly crawled underneath Spike, an easy task with how big he'd grown, and licked and kissed his cock to clean it of what cum was still on it. She felt warm and happy, and more than a little full. Her head was foggy, but in a pleasant way. All she needed or wanted was right there, and there was nothing else to worry about. "Was I a good bitch?" she asked softly, crawling out from underneath Spike.

He smirked at her with his long, fanged grin. "You were," he said in his deep voice. "You are. My good bitch." His cock twitched again. Maybe he'd take her for another spin in a few minutes. Before then, though, he had other plans. Twilight looked at him positively beaming, and if she'd had a tail he knew she'd have been wagging it. He reached out with a paw towards the ground, and grabbed his old, far too small collar. He wouldn't have worn it again either way. Things had changed, and it was right that they acknowledge that. "And everyone should know that," he said, passing the collar to Twilight.

The girl looked at it with sparkling eyes, and took it with trembling hands. "Thank you, Master," she whispered. "I promise I'll continue to be a good obedient sexpet for you." Once she'd said so, she tried to put the collar on. At first it didn't seem to fit, but after a moment it clicked on, almost melding around her neck like a single strap of fabric. She grabbed the pendant and looked at it, tilting her head. It read 'Spike's Bitchslave'. That seemed right, yes. She looked up at Spike with a dumb smile and adoring eyes, squeezing her huge tits between her arms as she sat on her large ass.

Spike raised a claw, and affectionately scratched the side of her face. "Good bitch," he said. He was about to get around to testing her remaining hole, when a sound interrupted him.

A voice came from outside. "Twily?" Twilight Velvet called to her daughter. "Sunset is here, she came to visit. Are you locked there in your lab again?"

Author's Note

I know what Spike experiences isn't what a normal dog would, but Spike is anything but a normal dog. As for why he doesn't just jerk off or use the toy, first we wouldn't have a story, and second, if you had a genius girl at your service who's fully capable and willing to build you the world's most advanced sex doll you'd do the same thing he did.

Also, his behaviour in the early part of the fic is extremely inappropriate given the situation, and the implication of Twilight being asexual. Don't act like that irl. This fic goes out of character for the sake of clop, he was definitely being a dick there. I'm also not sure why I even wrote him like that I wrote that part two years ago or something, this fic took a long while.

Ro-Barb is the female robot dog Twilight builds in Mad Twience, which shows up again once in a picture in another short, and I'm 90% sure I stole the name from a FanOfMostEverything fic since there is no official one.

Dog themed fleshlights are absolutely a thing, if you were wondering. Bad Dragon probably has one, but specifically I was thinking about those made by the same seller that makes pony-themed ones.

Gone Monstrous

The machine Ro-Barb had first emerged from, which had undergone a few changes in more recent times, served as the main source of light in the laboratory, casting its magical glow over the scene. Most of the stuff that had previously been there had been removed, mostly to make space for all the extra occupants that resided there and for the considerable size of a few of them.

Spike sat to a side, the only male creature in the room and by far the biggest, his back against a wall and his heads almost reaching the ceiling. There were three of them, just as there were three monstrously sized shafts protruding from his crotch, each being attended to in different ways by his multiple lovers.

Starting from the right was his most recent addition. Gleaming Shield, formerly Shining Armor, looked just about the same as Twilight had after becoming his bitch. Huge tits, a round ass, plumped up lips, and a dumb expression on her face as she speared herself onto Spike's shaft. Her belly bulged to the point it touched the ground, while her arms and legs hung limp as the cock inside her kept her up by itself.

Gleaming's mother looked at her with love, down from her position between two of Spike's dicks, slavishly worshipping all six of his beach-ball sized testicles. Her own tits were not too different in size, and in many other things she resembled her daughter. Her belly bulged however not with cum, but with puppies born from her love to her Master. She would in the not too far future give birth to more bitches for him, and more alphas to continue his legacy. She lovingly stroked her round belly with one hand, her tail wagged happily from side to side and her ears stood up on her head.

Sunset was on her back underneath Spike's middle cock. She was a mirror of Twilight Velvet in how far along her transformation was, and in how full of new life her belly was. The dick above her was long enough to cover her whole as she held her legs up like a dog on its back, and occasionally she would raise her head to lap at the knot hanging over her eyes. That aside, she looked completely out of everything, fully absorbed with dreamlike totality in the act of staring at her Master's dick and inhaling his scent, there on the floor beneath him.

To the two sides of that same middle cock, two more of his bitches sat kneeling, pregnant and kissing his shaft. They too hand undergone quite the transformation, though the other way around compared to most other girls in the room.

On the right was Winona, who Applejack had allowed Sunset to borrow without much question and who would soon be used to lure the farmgirl there to add her to Spike's harem. The bitch had been the second dog to ever gain human-like sapience, and there was something funny in how short the time she'd had to fully appreciate it was. Mere seconds between the moment she rose above her instincts and the moment those instincts took her over again as she was fucked and properly broken by Spike's dick. She was even more worshipful and obedient to him in that state than she'd ever been as a dog, and Spike quite liked the knowledge of that. Though her two rows of tits weren't as big as some of his other sluts', and her canine facial features left her lips a touch less plump than his human slaves', there was still something deeply exciting about her anthropomorphised body, the combination between her dog fur and the hypersexualised humanoid frame it covered, the way her hands and long nails still resembled paws and claws, being both incredibly dextrous and incredibly soft and smooth on his shaft.

Ember was on the left, a mirror of Winona's body, though slightly taller and with bigger breasts. Breaking her and turning her his had given Spike particular pleasure, given how defiant and aggressive she had been. Her spiked black collar was all that remained of her old attitude, the once proud and untamed stray pack leader had been turned into a cock-hungry slut who'd obey any command he'd give her without a second thought, and probably without a first thought either. There was really something extra enjoyable in seeing her so dumb and weak, remembering the way she'd used to bark at him before he'd shown her her place. To think of all the dogs in her pack who'd have wished to bed or more realistically be bedded by her, and he got to breed and break her. And he'd do the same with some of the other bitches there, soon enough, alongside Su-Z's dog once PostCrush's tour was over. Though thinking about it, maybe he'd breed the two popstars as well, not just their pet.

On his left cock, around it and properly stretched by it, the second most recent addition to his harem, and perhaps the most peculiar. After Twilight had gone through all the trouble of fitting her for him, it was a shame that Ro-Barb had to go unused, yet at the same time he was far too much for the body she'd had back then. Thankfully, the same magic that had made him and his pets that much physically better had also proven to be quite compatible with the bot's technology, and so his first ever partner had received an upgrade to match his new self and interests.

And what an upgrade it had been. The robot bitch, perhaps the one most fittingly described as a sex doll out of all his bitches, looked like and literally was built for sex, and damn good sex at that. Her body was an exaggerated caricature of human femininity, with a few hints still there of her canine nature, such as her tail and ears. She only had two breasts, huge breasts, made of soft and pliable rubber and fitted with pleasure sensors to send her artificial brain into overdrive whenever they were played with. Her muzzle looked slightly more dog-like than human, but her mouth looked like neither, and really it didn't look like a mouth at all. It was a hole designed to milk his cock, the thick ring of rubber around it her would be lips, the entire thing and her entire mouth and throat just a hyper-advanced vibrating sextoy. Her hands and hind paws were fitted with vibrating pads, perfect for massaging his shaft and balls. Her thighs were thick and wide, and her ass a mirror of her tits.

She had a single hole between her legs. Technically, it could be counted as her pussy, but the bot was more sextoy than living thing in that regard. The simple truth was that it was a fuckhole, the place Spike was meant to slide his dick in. The core of her being, really. Ass and tits were enjoyable, and the things fitted on her limbs and head were neat, but when one really got down to it Ro-Barb was a hole for his dick with some fancy tech around it to make said dick cum faster and harder. That said high tech masturbator also came with general intelligence comparable to a human's and far greater processing power than any animal brain only made the knowledge of her single purpose condition that much hotter, especially when all her computing power was directed only at making herself a better sextoy for her owner, when the orgasms he gave her didn't make her crash at least. Spike quite loved the way she'd fitted speakers to the side of her head, as to not compromise the sex hole functionality of her mouth, with the added advantage that she could freely worship him verbally even when taking him in her throat. The added vibrations were quite nice on top of that.

But what he loved more than that was fucking her like the hole she was, literally jerking himself off with one of his huge paws around her body like he was doing right then. The sides and back of her torso were full of pistons and vibrators and motors, pressing and massaging his cock, but the front up to her tits was semi-clear and stretchy rubber, and stretch her he did. Her belly looked like a condom as his cock pushed out of it, completely wrapped around it. Soon he knew it would stretch even further, once he came in her and bloated her like a balloon, a sight he always enjoyed. Judging by the static crackling through her speakers at that moment, he'd crashed her main again, probably the new pleasure sensors she'd installed in her insides. She was adamant on cramming as much sensitivity as she could into herself, and while it didn't make her a better toy he certainly didn't mind the way it consistently led to her system overloading whenever he fucked her, often turning her into a limp fuckdoll for him to use until she next rebooted herself. He suspected she didn't mind it either.

And higher than all of them, the first of his bitches, both in terms of order of acquisition and in terms of rank. Twilight was at that moment lying atop his muscled chest, her mouth locked in a sloppy kiss with his central head, far larger and smarter than hers, and she was a sight to behold.

Her belly was round and full, heavily pregnant, easily the biggest thing about the girl, and it would have been pressing against Spike's broad chest had it not been for her second largest feature. Her tits, all six of them in three vertically stacked rows from her original chest down to her belly, had grown even bigger than they'd previously been. They looked close to exercise balls in size, and the combination of her advanced pregnancy and the weight on them meant they were constantly leaking down a rivulet of milk, drenching Spike's fur and spilling over his shafts and balls. Her ass was no less sizeable, huge and jiggly and soft as Spike's digits sunk into its flesh as he held her there, one of his claws slipping in and out of her leaking pussy.

Her long, fluffy purple tail was fully up, wiggling from side to side excitedly. Her thick thighs tapered into long, slender legs than ended in canine hind paws, fur progressively covering more of her limb the farther down one looked until her once feet were practically indistinguishable from a dog's if one looked only there. A little fur had grown in symmetrical patches over her shoulders and back and arms too, and although her hands were still fairly human-like her long nails did slightly resemble a dog's. Her ears had moved to the top of her head, big and mobile, at that moment focused forward. Her mouth and face had turned partly to a snout, still capped by her signature overinflated cock sucking lips, and above them was a dog's nose. Her tongue was longer, and at that moment entangled in Spike's far longer one as he basically fucked her mouth and throat with it.

The bimbo bitch felt really happy. She always did, ever since she'd started wearing her collar and embraced her role, but she was still constantly blown away by just how amazing her life was. Maybe it was just her inability to keep it in mind for too long, too overwhelmed by the pleasure in her present to proper crystallise the past in her memory. Her only occasional source of confusion was whether she should be calling Spike her Master or her Masters, now that he had three heads, but usually she forgot all about that the moment he touched any part of her with any part of his. Her whole body was an erogenous zone at that point, perks of being a fucktoy.

As Spike's central head still swabbed her throat with his tongue, and while one of the others was busy panting and drooling over Ro-Barb as he jerked himself off with her unconscious body faster and harder, the third turned to look to Twilight as well. It extended forward, giving her a few licks that coated her in his saliva and nibbling at her closest tit until it bit her nipple, causing a jet of milk to shoot out and into the dog's maws. Twilight moaned around his tongue, and Spike's other head growled, pleased. Then the central one slowly drew his tongue back, while the other kept licking milk off himself and Twilight's tits.

He could have told her what to do, but that was no longer necessary. A simple nod and the way he looked at her were all that was needed for Twilight to understand and follow his command at that point. Instead he used his mouth for something more entertaining. "You dumb fuckslut," he called her, removing his hand from her nethers as she slowly slid down his pecks, as per his instructions. "You sextoy bitch. Good for nothing but taking dick and birthing more bitches and pups, and when they grow up I'll be fucking your daughters while you fuck my sons." It was redundant at that point, things they'd said again and again and knew well, yet the dirty talk never got old. It never stopped making him hard or making his girls wet. Somewhere below, Twilight Velvet's efforts on his balls grew stronger, indicating how well she received that particular sentence.

"Yes, Master," said Twilight. "That's all I'm good for, so please let me service your beautiful cock." Her voice was sugary, throaty and full of lust. She kept sliding down until she reached his crotch, and then horizontally until she was lying on top of his middle cock, pushing the two dogs there aside. She planted her lips on the top of Spike's knot and kissed and licked it, while her six massive tits slid to either side of his shaft. Winona and Ember wasted no time getting to the ground and suckling on the closest nipple they could reach. They were all sisters there in being Spike's bitches, but among them Twilight was like a mother to them, being the first and Spike's favourite and the progenitor of their condition, and the one furthest along in her transformation to the perfect partner for their Master.

As one head kept panting as its closest hand jerked a cock off with Ro-Barb, the arm on the opposite side reached out the grab Sunset from beneath Spike's dick and Twilight's tits. The girl, still in a dazed state, was placed faced down and ass up on Spike's chest, and his free side head began to tongue her nethers, reaching deep enough into her to make her scream.

His paw then free again, he moved it over Twilight's back, and began to slide her back and forth over his cock. It wasn't hard, with all the milk and drool and pre covering both her body and his shaft. The girl for her part did her best to use her arms and legs to keep her tits pressed around the sides of the dick she was on, giving him an oversized boobjob and spraying extra milk on the floor in the process. She also planted her inflated lips, and really her whole face, over the surface of his dick, drooling out as much as she could as she was dragged back and forth.

It wasn't long between the combined stimulation of her heavy round belly over his shaft and her huge tits on either side of it brought Spike close to the edge of another orgasm, the warmth and tightness of her whole body simply delicious around him. But he had no intention of simply spilling his load all over the floor, even if doing so and then letting his girls lap it all up was a pretty enticing idea. But not right then. He stopped jerking himself off with Twilight's boobs and body as a toy, and instead used his claws to raise her head so she was looking at him by grabbing a pawful of her mane. "On the ground, slut," his middle head said. The others were still busy respectively panting over Ro-Barb and ravaging Sunset's pussy.

With a smile as dumb as it was happy, her tail wagging side to side excitedly, Twilight gave a nod and a bark of acknowledgement, then began to slide off his cock. She made sure to do so by moving towards his tip, and giving it a sloppy kiss as she fully got off, getting a mouthful of thick pre in the process. Once she was on the ground, on her knees, she gave a long worshipful lick to the underside of the oversized shaft, then turned around. As she moved back, Winona and Ember returned to licking the cock she had left.

Spike's free front paw went to the bloated girl on his side dick. He took hold of her and began to slide her off his cock, and his head pushed Sunset down towards the emptying spot. The redheaded bitch crawled down his torso and up his shaft, swallowing all the traces of cum Gleaming had leaked out, and finally she let herself onto the ground, face down buried in Twilight's sister's cunt and eating more cum out of it, ass up and pussy leaking and waiting for Spike to penetrate her.

Still jerking one of his cocks off with his robot fucktoy, Spike slowly began to raise himself up from his sitting position, leaning forward and resting his free paw on the floor and stretching his hind legs as his hindquarters rose. He looked like an impossibly big wolf like that, aside from the one paw still holding the world's most high tech sex doll and sliding it up and down one of his dicks with a frenzied pace. His other two shafts rested on Twilight and Sunset's backs, cradled by the shapely, exaggerated curves of their asses. With no longer enough space to stand there, Winona and Ember had moved to licking and caressing and rubbing themselves against his massive balls, and Twilight Velvet had dragged her older and still barely conscious daughter there to do the same.

Spike drew his hips back, his tails raised, lining himself up. His side shaft poked against the wet entrance to Sunset's leaking pussy. His middle one aimed a little higher, and not just because Twilight's bloated belly and milky breasts kept her so raised above the ground. The tip of his cock found her anus, and entered it with ease. Her entire body was a thing born for sex after all, her every hole was always ready for him and easily able to stretch itself to accommodate his length and girth. Two of Spike's heads grinned, the third still busy drooling like a dumb dog. Then his hips thrust forward.

He slid into both girls with ease, stretching them wide with his shafts, and he didn't waste a second after that. He began to thrust back and forth, faster and harder, leaning down and pressing their bodies to the ground with his muscled furry bulk while ravaging them doggy style. The sound of his hips slamming against their sex doll asses echoed loud around the room, mixing with that of their own moans. It wasn't long before Twilight's cries of pleasure turned from incoherent words to incoherent barking, her mind overtaken by her more primal instincts. All the while, his remaining bitches all worshipped his many balls, their inflated lips constantly pressed against them as they drooled all over their surfaces.

Spike's thrusts against Sunset and Twilight were so forceful that the only thing keeping them from sliding forward with each one was his body pinning them to the ground. His hips moved like a blur, all three of his heads panting with their tongues lolling out and drooling onto the ground, his brains single-mindedly focused on his need for pleasure, his need to fuck and cum. He growled and grunted as he maintained his brutal rhythm, enjoying every moment of the girls' bodies wrapping tightly around his shafts, every second of his cocks sliding on and out of them sending electric thrills all through the surface of his shafts that turned his mind to a fuzzy, tingly field of thoughtless, lustful instincts.

With the girls cumming around him in seconds, spilling their juices all over his dicks, it wasn't long before he was about to orgasm as well. It wasn't supposed to be long, that was the point. With his bitches made into fuckdolls that good it was only natural for him to cum so fast when really taking advantage of their bodies, and he wouldn't have had it any other way. The sooner he came the sooner he could get to cum again after that, after all, and bloating his girls up was always something he relished the sight and feeling of.

A warm tension spread over Spike's body. His pants became guttural, his thrusts slowed before picking speed back up again. With one strong push of his hips, he pinned the two girls he wasn't holding into the ground, and his knots forced their way into their holes. The same happened with his robotic partner after a few more moments of jerking himself with her. His six balls tensed as the members of his harem he wasn't fucking slobbered over them and worshipped them with their bodies. He threw his three heads back and howled and his free hand clawed holes into the pavement.

Spike came inside all three of his partners. His body quivered as he shot rope after rope of thick warm cum into their bodies, as they came and screamed in unison with him. Their bellies bloated, their eyes rolled back, their mouths open. Ro-Barb's elastic belly grew too wide for Spike to hold her and he dropped her to the ground, cushioned by the size of her inflated insides, still growing larger as Spike kept cumming. He rested his now free paw onto her back, not crushing her sturdy mechanical body but still causing some of the cum to seep into the rest of her robotic insides and leak out of her elsewhere.

After a few minutes of spurting into the girls, all the cum firmly kept inside them by his knots as they came over and over and shook around his shafts, Spike finally calmed down. His howling died down to slow pants, his tongues drew back into his mouths. As the three girls lay half unconscious on the ground with enough cum inside them it weighed more than they had used to, before getting their assets expanded and their bodies filled with new life at least, he slowly stretched his back and then began to draw back from them.

His cocks came out of their insides with loud plops, and immediately the sluts who'd been tending to his balls were hungrily on them, or eating the cum leaking out of the ones he'd just filled. Spike sat back against the wall as his bitches busied themselves servicing him. Winona and Ember, overtaken by their primal urges at the sight of him breeding the others, wasted no time in spearing their pussies on his cum-covered cocks, eagerly sliding up and down them while Spike lazily watched them. Twilight Velvet, the wisest of his slaves as much as any of them could be wise, took the remaining cock for herself and began to glide her massive milky tits up and down it, kissing it and licking it along the way.

Gleaming, left without a shaft to please, lazily crawled to her sister's ass and started to eat cum out of it, one hand stuck inside her leaking pussy as her tail wiggled back and forth. Spike watched her with some amusement, but mostly being content after his most recent orgasm.

Ro-Barb would need repairs again, and that meant letting Twilight be for a while so she could actually think of something that wasn't being fucked and have a thought process that didn't amount to barks and pants. That was fine, she'd been a good girl that day. She could be left to herself a little while Spike took care of his other pets. On that matter, Applejack would be coming to see Winona soon, and Rarity would most likely be with her.

Spike gave a lazy upwards thrust with his hips. It was already almost time to expand his harem again. His shafts twitched, his balls tensed, and his three heads grinned. He just couldn't wait to see it through.

Author's Note

I totally didn't base three headed Spike's attitudes on the memes surrounding Legendary Ghidorah. Especially the third head. Nuh-uh.