Author's Note

Personally I wanted to name this chapter:

Chapter 1: Sisterly Bond of which Shining is fond (especially with that ass)

Buuuut I lost the dice roll with my friend.

Shining is out-of-character warning here.

Personally I wanted to only publish it after all the chapters were done, but my friend insisted we publish it today, so that is what we do. I hope you all will enjoy the read as well as the future chapters!

Chapter 1: A Mistake and A Fistfull of Dragon Ass

"Ooooooh fuuuuck..."

That sentence was rarely a good sign in the Castle of Friendship, under most circumstances. And since it was uttered in the lab-room and not in one of the many bedrooms, it most definitely wasn't one of the positive circumstances. That it came from Twilight Sparkle's lips and with an inflection that dripped with “I screwed up badly this time” made it crystal-clear, that this was one of the worst case scenarios.

An incident on the same level as "I cast the Want-It-Need-It Spell and now I'm getting gangbanged by half the town" or "I invited Queen Chrysalis over for a friendship lesson and now she is nearly invincible, after raping the everloving crap out of me and my friends".

And once again it was entirely Twilight Sparkles fault.

"What did you do!?"

"I can fix this, Barb! I can fix this! Oooooh...shitshitshit."

"Not good! It's overheating! Turn down the valve!"

"I'm trying, okay? It's stuck. The heat warped the metal and--"

"Oh Celestia...oh fuuuck, it's spilling out!"

Screams followed and glass shattered. Within moments, the seals on the door came to life, before burning out and disappearing. A small whoomp could be heard and the door bulged under a sudden force. For a moment...silence...

Then an explosion rocked the entire castle.

Starlight Glimmer looked up confused from the book she was studying in the library. She barely had time to shout, before the wave hit her.

Pinkie Pie was gingerly handling a fragile souffle, only to have it collapse in her hands when the ground shook. Her outcry of exaggerated despair was muffled quickly by the purple smoke entering her kitchen.

Rainbow Dash was sneaking into Twilight's room, trying to get her hands on her friend's exclusive "Daring Do and the Jungle of Fate" edition, the newest from a recent series. She perked up, thinking she had been caught, with one leg still out of the window. She was not fast enough to escape the fallout.

Ponies looked up in confusion, as the Castle of Friendship began to exude smoke and a strange odor from every single one of its openings. Strange mist climbed out of open windows and doors. But then, everything slammed shut with a bang and smoke was cut off. It dissipated, as runes glowed within the walls and arcane force fields went up on every window and door.

Within seconds, the entire castle was sealed.

Shining Armor was just relaxing in the living room portion of the castle, watching a fan-movie with a noticeably saucy dressed Daring Doo actress. He was there for a spontaneous family visit, as life in the Crystal Empire had gotten a bit dull recently. Unfortunately, Twilight had been busy with an experiment, by the time he showed up at her doorstep today, so he had been stuck watching movies for now.

With how she was, he knew it was best to not distract her, lest she blew everything up, again. A pity really, as he wanted to get a few more gropes in earlier. Mostly just to rile her up, but also because she was one hot piece of mare in his eyes. And Shining Armor always had an open appreciation for female beauty. A very…physical appreciation.

He was strong, even for a stallion his size. An athletic body with a six-pack, muscled chest, large biceps and an overall trained body, honed to its peak, as could be expected from the former guard captain of Canterlot. If anypony could be called attractive, it would be him. Of course, his perfect jawline and handsome face helped too. He in fact had been an underwear model before, filling the dreams of many a lonely mare with his bulging crotch.

Alas, even with a twenty-inch long cock, that dangled down to his knees, he couldn't fuck all problems away. Not that he didn’t try, of course.

When the explosion rocked the castle and shortly thereafter the arcane defenses sprung up, he jumped up, pausing the movie and turning the TV off immediately. Rushing through the smoke, he made his way to the cellar, as quickly as he dared, trying not to inhale the weird gas.

"Twilight? Barb? Everything alright with you two? Your big brother is here to save the day!" he called out, hand waving away the light hue of the purple smoke as he neared the end of the stairs. Perhaps he was being a bit melodramatic, but he liked making an entrance.

Besides..it wasn’t the first time his sister had blown herself up.

Twilight had put her lab underground. A repurposed dungeon one might say, if the Castle of Friendship could ever have one. As it was, it was instead just the last room on the end of a long hallway, right after the storage, plumbing and so on.

The door was visibly scorched and hot to the touch as Shining opened it. A waft of smoke spilled out and he had to cover his mouth and nose.

Everything was a mess. The tables were overturned, instruments were smashed and there was a lot of broken glass on the right side of the room. Shining had little clue as to the actual worth of all the smoking scrolls, shattered rune-stones, bent metal detectors and ripped cables, but it was likely a lot. In the top-right corner sat a strange machine that was sputtering and fuming, with the large glass-ampule in the middle of it cracked, from which the smoke was flowing out. The metal pipes around it were broken as well and the magic circle containing the whole thing had been burned off the floor. Every seal nearby had been shattered like egg-shells.

"By Tartarus..." mumbled Shining, as he looked over the trail of destruction.

A light cough drew his attention to the opposite side of the room. There, he could see two bodies stumbling through the purple cloud of dust and smoke. He immediately stepped towards them, his initial joking demeanor now gone and replaced with genuine worry. "By the Crystal Heart, are you two unhurt? What happened? Is everything okaaaayoooly SHIT!!"

Twilight stumbled into view and Shinings jaw hit the floor.

His sister had never been bad on the eyes and that was doubly true for when she became an alicorn. But even the usual curve of these immortal sex-machines could not compare now to the truly preposterous body she now sported. Her boobs had grown massively, to the point where E-Cups would be a pessimistic estimate. They were as big as her own head! G-cups, definitely!

But her thighs were the kicker. Each had fattened up to the point where they nearly touched in the middle. How she could even walk now was pretty much beyond Shinings understanding. A small gap further up practically forced his eyes up to her...privates. Her hips had widened massively and were now flowing into a thick, juicy ass, which completed the picture of a very curvy, almost unrealistically pornographic appearance.

His sister got thicc.

"I-I'm okay, Shining. Just a slight headache and some burned clothes, that's all!" stammered Twilight, trying to beat away any stray flames on her head and seemingly entirely unaware of how thoroughly her lab coat failed to cover up her torn shirt and pants, which were ripped in all the right places. Purple meat spilling out here and there, with her nipples oh so tantalizingly barely covered.

"Twilight...I think, it's a tad more than just your clothes..." said Shining, unable to take his eyes from his sister's incredibly lewd body.

"What?" Barb now stumbled forward and Twilight turned about. When she saw her favorite assistant and adoptive sister, her eyes grew wide. "Oh gosh, Barb! Y-You...look ridiculous!"

Barb had changed, too.

The dragoness, who previously had been a bit on the slim side, now had earned several pounds of fat in all the right places. Her breasts had ballooned out to just a few inches shy of Twilight's new size, while her rear had grown massively, to the point her heartshaped asscheeks now looked like somepony had stuffed a melon into each. Her tail wound itself around her sexy legs, with the tip now a succubus-esque spade. That her hotpants hadn't exploded was a small miracle and their heroic effort to contain Barb's enhanced rear would certainly become the stuff of legends among clothing articles for years to come.

Barb just coughed out a small fireball and sneezed. She looked over to Twilight and scoffed. "Like you're one to talk. You look even worse than me," she pointed out, her eyes wandering over the purple mares bonkalicious booty. Then she looked over to the still-smoking machine. "By the way...shouldn't we do something about that?"

"OH FUCK!"

Twilight turned around and rushed over to the broken device. "I gotta run diagnostics, to see how big the damage is..." Her horn began to glow and a series of arcane, holographic screens suddenly popped up. Whatever was on them seriously concerned her, as she began to noticeably freak out. "Ooooh nonononononono! This is bad. This is seriously bad!"

If this was bad, Shining sure didn’t mind it. His sister looked gorgeous and he had to make a real effort to keep his dick from ripping his pants. It visibly strained against them and he was acutely aware how a fat outline was now visible all the way down to his knee. He briefly wondered, if his dick would have grown as well, had he been present during the explosion.

"The damage is big, isn't it?" Barb asked in a nervous tone, making Shining snort as he walked up to the two.

"About as big as your asses?" he joked, trying to lighten up the mood, while ogling them still. He never really hid his leery gaze with his sisters. Didn't bother even back when they were teenagers and started to fill out.

Celestia knows how often he had snuck in a grope or two here and there. Enough to make Twilight exasperated and Barb a pouting and blushing mess. And as he couldn’t help himself back then, he surely wouldn’t be able to hold back now. Their new bodies were too much for any stallion anyway.

So as he made his joke, he got a bit down, squeezing the right ass cheek of his dragon sister. To his pleasant surprise, he didn't get told off or his hand swatted away like normal. Barb didn't even react at first, when his hands touched her generous rear. And how generous! It was soft, pliable, but still bouncy and a bit firm. Her skin was slightly rubbery and her flesh similar to an overstuffed pillow. It topped even the feel of Cadence's butt, which Shining had never thought to be possible. And it certainly was much bigger, too.

Additionally, the dragoness was a bit of a shortstack, so it wasn't as easy to cop a feel without going down slightly, though he could lift her up in hugs, so that was a big plus.

"That's not a laughing matter, Shining!" snapped Twilight, more out of panic than anything else.

Barb also looked up to him over her shoulder. Then her eyes traveled down to his hand and she raised an eyebrow. "Well, guess we are fucked then?"

Twilight shook her head. "No, I can fix this! It's bad, but...but I can do this. I have to do this." She evidently tried to sound confident, but Shining could hear the desperation in her voice. This wasn't an objective statement. This was Twilight in panic-mode.

Barb heard it too and sighed. "Yeah....no. I told you not do it, but since when does anypony ever listen to me?" she complained, before stepping away and shaking her head. "And now I look like a slutty bimbo and that's just the start. Gee, thanks sis...."

"Okay, hold on. What exactly did you two do here?" asked Shining Armor, now genuinely confused.

"Twilight was being an idiot, like usual. Just that this time, its not just her who gets fucked," said Barb and shot Twilight an annoyed glare. "But hey, whats a bit of terminal slutification compared to a second Crystal Heart?"

Several alarm bells now began to ring in Shining Armor's head. He slowly turned to Twilight. "You tried to recreate the Crystal Heart!?"

Twilight bit her lower lip, like a foal caught with her hand in the cookie jar, before nodding. "In theory it all was sound. I had the ressources, the facility and so on. The only problems were the material for the crystal and...time..."

"Exactly!" Barb huffed a bit of smoke out of her nostrils. "Which is why you rushed things and got this!" She stomped over to the machine tapped against the glass. The smoke went away a bit and revealed...a large, curved, black horn with a red tip.

A horn that Shining Armor would recognize anywhere.

"You took Sombra's horn!?"

"It was the only fitting conduit around!" argued Twilight, trying to defend her decision. "Growing a suitable crystal from scratch would have taken centuries! And it is already predisposed to casting wide-range spellwork and engaging in mental manipulation. I only had to adjust a few things in order to make it compatible. If everything had gone to plan, we could have had a friendship-reinforcing spellwave cover the entire continent!"

"Brainwashing everypony into being nice. Yup, totally not fucked up at all." snarked Barb.

"Starlight supported it!”

"Starlight supports everything that has to do with messing with ponies' minds!"

Shining had to blink, just in order to keep up with things. For a moment, he had even forgotten about his slight arousal. He had suspected that Twilight's eagerness for quick results got her into trouble again, but this certainly had been outside of anything he could have imagined.

"Okay...okay! Calm down, both of you!" he yelled. Barb and Twilight stopped their bickering for a brief moment and looked at him. Shining stroked his hair back and took a deep breath. "Alright...soo, what are we looking at here? What exactly is happening?"

Barb and Twilight exchanged glances. Twilight opened her mouth first, but then closed it again and looked away guilty. Barb scoffed and rolled her eyes. "Simple version?" she asked Shining.

"Yes, please."

"Okay. Simply put, this dumb horn is now turning every female in this castle into shameless thots. First physically and soon mentally. We are all going to turn into cock-addicted sluts and once it gets out of the castle, it's going to brainwash all the mares in Equestria," explained Barb, her voice dripping with angry resignation.

"If it doesn't get stopped," added Twilight hastily. "But if I can restore the seal and shut off the runaway collapse, then we can possibly ever reverse the process."

Shining nodded, stroking his chin. "Okay...and how long would that take?"

Twilight hesitated, before grimacing. "Rough estimate...maybe a year…?"

"And how long will you last against this?"

"...a few days..." she said, even quieter.

"Hmm...and it only affects females. Like, body, mind, etc.?"

"Yup. If one thing is for sure it's that Sombra, dead or not, had his priorities straight. Depending on individual circumstances, by the end, none of us are gonna care much about reversing anything..." answered Barb, with a defeated sigh.

Shining let that sink in for a moment. He considered the implication of this. What this would mean for his country, his friends, his family. How it would turn even his lovely, barely legal Flurry Heart into a shameless thot, who would spread her legs to any stud without a second thought.

He turned to the two beauties in front of him....and dropped his pants.

"Splendid! Who of you wants to suck me off first, then?”

A few minutes later.

Shining Armor was in one of the many bathrooms putting some ice on his kicked-in groin and the newly acquired black eye.

"Geez...what just a joke."

Well, okay maybe he hadn’t really joked. If they dropped to her knees, he wouldn't have stopped them, that was certain. Too bad that instead of dropping, Twilight got badly offended and kicked him out, quite literally. And slutty body or not, she was still an alicorn. An alicorn with a very nasty right hook.

Though she definitely went overboard, in his opinion.

Black eye? Sure. Kick in the balls? That is just a strike below the belt! Literally! And it hurt like tartarus, too. Though, it wasn’t the first time he had been kicked in the dick. Luckily it wasn't as bad as it could be. He could still sire foals and would be right as rain after a day. At least, he hoped…

"Maybe I should tell Twilight that the spell had affected me too, to get her on my good side again?” he wondered out loud. “Eh...no, she won’t buy it. Barb said the spell only affected mares. If anything, she would just punch me again.”

Barb luckily wasn't that aggressive. She didn't look too happy about the joke, but wasn't about to give him a beating for it either. Sure, she could be frustrated with him, but they were generally on good enough terms. They had fun movie nights, when they got together, and she happily complained to him about Twilight and her latest fuck-ups or how she was overworked and underpaid.

Considering they were siblings and had gotten intimate before, it probably was not much of a surprise. When she was a teenager she had even gotten a slight crush on him. Mainly because of his body, not his attitude, though.

Of course, being the good brother he was, he had teased her. He even walked in on her in the bathroom naked one time. Harmless stuff. Stealing her first time while she was still a teenager was one of his proudest achievements. And after she had gotten over her crush she didn't even blame him for it.

The young dragoness wasn't the most romantic type overall, so maybe it shouldn’t have come as a surprise. She was more into the stuff he likes, like comics and movies.

Barb was like a bro so to say and a voice of reason that reprimanded him sometimes. Funny, really. Both him and Twilight were nuts to a degree, him with perversion and her with science and their cute purple dragon sister always had to reel them in. And she was notably younger than the two of them.

It made him crack a grin, thinking about it as he sat there, listening to the water pouring into the large tub behind him as he was sitting on a chair next to it. His discarded pants laid on the floor, as he hadn't bothered to put them anywhere else.

Once the large rectangular bathtub was full, he got in once the water was warm and leaned back. He took the ice pack with him too, holding it to his groin. He sighed blissfully while his abused body felt at peace. No doubt a healing experience and luxurious just the way he liked it.

As he was daydreaming in the growing steam, he didn't hear the distinct sound of the door opening, nor did he notice the curvy silhouette approaching him.

At least not until it straight up got into the bathtub.

Shining Armor looked up, taking a moment to discern just who it was.

"...Barb?" he asked, eyeing the salacious purple dragoness up and down. Shorter than the other mares, so it was easy to guess. The thick tail was another dead giveaway.

A big white towel was wrapped around her, only for her to unravel it suddenly, making the stallion blush and drool in anticipation...only to see she wore something underneath.

A nipponese school swimsuit. Blue and very tight on her body. Shining Armor remembered that he had bought her this last year for her birthday, though annoyed as she was at it, she had never worn it for him before. Complained that it was a bit too big for her too. Well, not anymore, it seemed.

She was filling it out perfectly. Her massive jugs were straining the rubber and there was a very clear cameltoe, where her snatch pressed against the swimsuit. In all honesty, she might as well have been naked, as it dug into her body so much that he could see her nipples and crotch.

"Yeah, it is me. But I doubt you are disappointed," she told him with a snort, seeing his dick already standing tall and strong out of the water, like an overager soldier.

"...I certainly am not. And you are wearing your old birthday present, too. I must say, I’m a bit bit flattered. Does this mean I’m getting the blowjob I asked for?" he asked, hoping that she wasn't about to step on his balls. After all, she was obviously only here to check up on him and comfort him.

Barb rolled her eyes, as she sat down on the edge of the bathtub. Her ass was spilling nicely from her swimsuit, with the stretchy rubber riding up her massive butt. Even with her having finally "grown into" it, albeit accidentally, it clearly was a bit tighter than was strictly necessary.

Not that Shining Armor complained.

She looked down at him and sighed. "Seriously, is sex the only thing you ever think of?" she asked, though he could hear that slightly amused undertone in her voice.

Barb had never hid her less-than-stellar opinion about him or Twilight, once she got older. Perhaps it had been puberty, perhaps just the natural disenchantment anypony had with their family, when they grew up. At some point, older siblings stopped being perfect, gleaming idols and instead looked more like....people. With warts and all, as they said.

And yet, Shining knew Barb had always kinda liked him, underneath all that scoffing and eye-rolling. He knew he could get away with a lot when it came to her.

"What can I say? I just got told that my sexy sister is gonna turn even sexier. And this time, she is going to use her mouth for something more appropriate than talking about magic or friendship," he said, cheerfully. His eyes then wandered over Barb's amazing ass and his once-again throbbing dick twitched approvingly. "Also, if this is what the spell does then I sure as tartarus am not complaining about the result. You look amazing, Barb."

The dragoness scoffed again and tugged at her swimsuit. "Gee, thanks for looking forward to our brainwashing. Good to know that your priorities are just as fucked up as Twilights," she snarked.

Shining just shrugged and threw her a slight, self-aware grin. "You know what I'm about, Barb. From the day I popped your cherry all the way to marrying Cadence.”

For a solid minute there was silence and Shining took the peace and leaned his head back, enjoying the pleasant warmth on his skin.

The sound of splashing water and small waves rolling over his pecks made him open his eyes again and spot Barb lowering herself into the bathtub, opposite of him. Her boobs floated on the water, like softballs. She looked at them and tried to push them down for a moment, before giving up.

"Honestly, I have no clue how Cadence deals with this. Doesn't this hurt her back?" she wondered, as she let her hands run down her lewdified body, tracing back the sexy curves that had now been forced upon her.

It was a fair enough question, considering the modest A-cups she had prior to this. E-cups made a world of difference and no doubt walking had a different feel for her now as well, with that massive pair of extra weight dangling off her chest.

Not that it was unusual for small breasted dragonesses to exist. Apparently, maturing started later and took longer for them, meaning you had a lot of small chested cuties to look forward to, even as they reached legal age. But once they hit their growth spurt? Massive badonkadonks! Almost as if the dragon biology couldn't decide if they wanted to make their dragonesses jailbaits or busty buxom seductresses.

Barb didn't appreciate that viewpoint too much, albeit she acknowledged what a weird trait it was for her race. And for a long time she had envied certain dragonesses, who had the luck of sporting extremely curvy bodies, like Ember who arguably rivaled Celestia in sheer sex-appeal.

Shining chuckled at her confusion, finding it quite adorable. He always had been a sucker for cute little sisters. And luckily for him, he had been blessed with two in his life and had gotten his dick wet with both of them eventually.

"Well, Cadence is an alicorn. So strong backbone. And she lived with her huge boobs pretty much since she was a teenager. And you are a dragoness, so I think you’ll be fine. You will just have to get used to it," he explained to her as she raised a brow.

He lifted his hands placatingly, leaving the molten ice pack in the tub. "No offense meant. You know me very well. I just state what I think and you do know that I am right. I’m sure this curse won’t make you blow up to such an extent, you won’t be able to walk. At least…I hope not."

"I do know you, so you are right in that regard. You are a pervert. And if you didn't look like a chiseled sex-god, you would be regarded as pure scum. But ponies forgive you more easily for your transgressions, because of how well you keep in shape, I guess…" Barb stated calmly. A bit of a damning statement, though Shining had to admit she had a point.

"You are not wrong with that, but I am also a hero, that helped save the Crystal Empire and fought in the changeling invasion, so that has to count for something," he countered back, humming in thought.

"That you are, which is why I hang out with you, despite your attitude. And also, because you like comics," the dragoness continued.

"And you have a bit of a soft spot for me, even while not trying to show it. It can hardly be a coincidence that you came here, dressed in the swimsuit I gifted you, right after Twilight was hard on me," he concluded.

The theory wasn’t entirely out of the left field. Shining knew it and Barb knew it. She wanted to cheer him up. Her dear older brother who was an idiot, but one who she cherished all the same. She didn’t want to admit it, but she always came to him asking for attention or playing time. And her denials were neither particularly convincing, nor did take away any of her charm.

A tsundere was the term for that, Shining remembered.

"Maybe I just wanted to take a bath, ever thought about that?" countered Barb, leaning back and letting the warm water flow over her body. "I just got blasted by a magical explosion, that's gonna turn me into a slut. Am I not allowed to at least get a shower after that?"

Shining raised an eyebrow. "And that's why you came here, instead of going to any of the five other bathrooms in this castle?"

He was rewarded with Barb blushing, her face turning beet-red. The young dragoness quickly averted her eyes, as she saw his smug grin. "T-That got nothing to do with you, okay? This is just...my favorite bathroom." A rather unconvincing lie and her grimace showed she knew it.

"Sure sure...your favorite. Maybe because this is here?" he joked and reached down. He lifted up his fat, veiny cock, which was still raging hard. Standing tall and throbbing, with its head flared and veins pulsing. Shining Armor jerked it slowly in front of Barb, watching her reaction.

The way she tried not to look at it, but stole glances repeatedly. Her fat thighs were clenching almost by instinct. He looked down and saw her nice, fat boobs and those nipples poking through the bathing suit.

"It’s been a while, you know? I know you've been missing the taste ever since I hooked up with Cadance. Wanna get reacquainted?" he asked, grinning at her.

Barb bit her lip and glared at him. "You're horrible, you know that?" she snapped back, crossing her arms in front of her chest. Which did little more but make her new, fat boobs spill out over them, to her visible annoyance.

Shining was unconcerned. "I'm a stud. And as it seems...the only one for quite some time able to give you what you eventually are going to beg for. So...why wait?" Was it fucked up, that he was coercing his adoptive little sister into having sex with him? Absolutely. But that was what made it so fun in the first place. Besides, Shining had learned early on a very important fact.

Studs always got what they wanted.

Barb pouted at him, unable to really look away now from his towering dick. All twenty inches of throbbing, hot meat. The feeling of it. The taste...she had clearly never forgotten it.

"Fuck you..." she mumbled in frustration and sighed in defeat. Turning around, she crawled towards him, until she was face to face with his crotch. Her boobs squeezed his dick between them, the rubber of the swimsuit making it feel a bit like he had a blow-up doll in front of him. Her nose was inches away from his cock and he could see her face flushing, as his musky, intense smell hit her nose. "Gosh...it reeks more than last time..."

"That's my musk, baby. You finally got a body that's actually exciting me," quipped Shining. "No pity-fuck no longer..."

Of course he was joking as he did like her prior jailbaity body as well. But now? Those curves and this rack were out of this world! It was not even a comparison. She turned into a veritable sex bomb!

"I always had a great ass, perv," she countered back, looking a little bit disgruntled, but flattered at the same time.

It reminded him of the times he had walked in on her posing in front of the mirror in her underwear. Something she did quite a lot until he moved out with Cadance to the Crystal Empire. And while the dragoness had been angry at first, she had gotten used to it in the end and Shining liked to think that she did enjoy showing it off to him as well.

Her clawed fingers pulled the swimsuit down, letting those tits pop out with the light green erect nipples and areola on full display. She squished them together, hugging his dick nicely between them as she moved them up and down.

Shining's eyes of course were never leaving her, soaking her form in with his eyes showing his indecent thoughts, without him even having to voice them.

"You are going to get insufferable, now that I look like this, aren't you?" she inquired, irritation in her voice.

"...Maybe. But look at you! Your tits feel amazing and you have fully blossomed into a beautiful dragoness. In all honesty, if it was back then, before I married Cadance, and you had me choose between her and you...I would choose you," Shining said, making her jolt her tits up in surprise at that, followed by a fat glob of precum splattering on her muzzle and over her lips, giving her more of his intoxicating musk.

She wiped it off her face, trying to look like she was disgusted. "Well, am I glad to finally be first choice."

Barb's snark was biting, but Shining could see the very faint blush on her face, even as she scoffed at him. He knew she liked what he said. Those sweet little lies got to her, carried just as much by his charm as her own desire for praise. Her buttons had always been so easy to press, really…

"Good to know that you have no intention of keeping your marriage then. I wonder what Cadence would say to this," continued Barb, even as she sandwiched his fat dick between her boobs. The sensation, as she slowly rubbed them up and down his veiny shaft, was heavenly. "Her husband flirting with his adoptive sister....cheating on her...breaking his vow--"

She saw his smug grin and raised an eyebrow. "She would totally approve, wouldn't she?"

"Every second of it." Shining leaned back, hands behind his head and grinning from ear to ear. "Cadence knows what I'm about and so do I know what she is all about. Let's just say that I'm good enough in bed for her to have stopped caring where else I put my dick." He gestured lewdly, making Barb scoff again. Gosh, how he loved it now when she did it. Especially with those pouty lips and those long eye-lashes. That transformation had been so worth it!

"But enough about my slut of a wife. Let's focus on more important matters: Me!" Shining chuckled, seeing Barb look at him skeptically. He then pointed at his dick. "As lovely as your boobs are - and believe me, I'm a big fan of them - I think you can do better now."

"I'm not sucking you off!" protested Barb, even as her lips were only inches away from Shinings flared, pulsing cockhead.

"Come on...you're halfway there anyway~" teased Shining, wiggling his eyebrows. "You know, you want it. I can see you're drooling...."

Barb hastily reached up to her lips, checking if she was drooling for real. Shining had just been joking, but he had to admit it was funny to see her react like that. It spoke volumes!

"Th-thats just this dumb spell..." she argued.

"A spell which is eventually gonna make you do this anyway. So, why bother pretending otherwise?" countered Shining, with a shrug of his shoulders. He was in complete control now, playing Barb like a fiddle. "You and I know, Twilight ain't gonna fix this."

Barb scowled, looking away for a moment.

"Would you really like it more, if I were nothing but a cocksucking slut?"

Shining didn't even hesitate. "Oh, absolutely," he said resolutely. Then he leaned forward a bit and whispered: "And you wanna know something? So would everypony else."

She stared at him. For a few moments nopony said anything.

Then she sighed and shrugged her shoulders in defeat. "Alright then...guess even my own brother doesn't care about anything than my body. Why should I then?" she mused, apathy finally winning over common sense.

"That's the spirit. Now suck my dick, Barb!" laughed Shining.

"Yeah...yeah...on it, asshole," she mumbled. Then she opened her mouth, showing her long, forked tongue and then went to work...

Shining sighed, as he poured some warm water over his face. This was how life should be. Him, in a bathtub...and a sexy bitch worshiping his dick.

He looked down and watched Barb bob up and down his fat cock. The dragoness didn't even pay attention to him, as she plunged down on his throbbing rod for the upteenth time in the last few minutes. Her boobs spilled out between her fingers, as she squeezed them tight around his shaft, while her long tongue slathered his meat-rod with saliva, greedily licking every inch of it clean.

Her throat bulged whenever she forced herself down and he didn't even need to force her. She was barely legal and yet she tried to deepthroat him like a champ! Of course, she didn't manage it fully and no surprise there. Even Cadence had needed a few weeks of daily practice to succeed at it. But the fact that Barb - snarky, grumpy and fiendishly clever Barb - now sucked him off, moaning as she did so and very clearly enjoying it...it was like a wet dream come true.

His dick plopped out from between her luscious lips and Barb stopped for a moment to breathe. She was sweating, or perhaps it was just the water, and her eyes were hazy and unfocused as she rested with Shinings dick pressed against her cheek. "Hah...hah...this is...intense...the taste....its..."

She stopped, her eyes glued to his still rock hard penis and she swallowed hard. Shining could see her ass raised over the water, jiggling as she shivered. No doubt, her thick thighs now clenched hard as she gave his dick a good, long lick with her tongue.

"Shit....I think I like this..." she admitted, face flush with lust and just a bit of shame. "This spell is really fucking me up..."

"In all the right ways," added Shining with a big grin, his eyes traveling over her slutty body.

No doubt it was hard to determine with the water, but her pussy juices had to be overflowing with how heated her breathing was and how much she was worshiping his dick. Maybe it had also something to do with the suppressed lust she had for him. Suppressed by her clever little mind.

Her eyes met his, looking a lot less harsh than before. "Yeah...Figures, a perv like you loves it. Grinning like an idiot, while your sister sucks you off like a cheap hooker. Gosh, I should have helped mom to raise you better," she complained, before diving hungrily right back on his cock, making him grunt as she went further than before.

Dragons were stretchier than ponies and she was doing a very fine job. Maybe she could actually get it all in on her first time sucking it? An impressive feat to be sure, if she did it. Her disapproving sisterly tone made it all the hotter for him, as he was soaking it in.

"Oh yeah, sis. I am a bad, bad stallion. Now, suck me harder, you slut," he moaned out, making her snort in some amusement, though she didn't stop for a few more strokes with her maw, before pulling off again.

"By Celestia...you are beyond hope, you know that…fuck...and I am too for getting into this," she admitted, cheeks flushing a bit more as her mouth descended on him again. Her gullet welcomed him as it constricted around him, massaging him and coaxing more precum out.

Admirable fortitude. Just to see her slowly being corrupted and the immense enjoyment it caused her, as one hand left her tits, while the other reached around to still keep her boobs on his shaft. And while Barb tried to be sneaky about it, sinking her ass more into the water again, some slight soft splashing sounds announced that she was actually fingering herself off.

She just couldn't resist anymore.

"D-Damn, Barb. Wrap that long tongue around my fat prick, would you?" he requested, only for her to slightly roll her eyes and try that idea out. Her mouth stayed still for a moment before Shining moaned louder, as he felt the long pink soft flesh wrap itself around his member and then it was back to bobbing again, while sucking him hard.

"Thanks sis. You really are the best.” he groaned. “Fuck...You know, I never told you this, but I always jerked into your underwear when you were growing up and cleaned them up afterwards so you wouldn't know? Well, you noticed some were missing sometimes and suspected me. Luckily I never left them in my room," he laughed, bringing up a late confession which would have annoyed Barb no doubt a few hours ago, but now? Now it was simply a hot story to get her rocks off, letting her know his jizz had stained her entire collection of panties and she wore them.

It did earn him a horny grunt from the young dragoness, surprisingly, and the hand between her thick thighs just twitched a bit faster. It was obvious that even pouty little Barb could not help herself but get heated with all this depraved talk.

Her focus was now entirely on his dick, though, as she bobbed up and down, faster and faster. Muffled moans and wet, sloppy sucking noises filled the bathroom, as she tried to swallow more of Shining's fat meat. Her eyes glued to his prick, practically glowing with lust, as she began to forget almost anything around her. Nothing seemed to matter, except for this beautiful, tasty, amazing cock.

Shining could feel it now. The sight of his adopted little sister trying to deepthroat him, while she was fingering herself in front of him, was pushing him over the edge. He didn't feel bad for Barb's physical slutification before and he sure as tartarus hadn't changed his mind in the meantime. If anything, he absolutely loved it!

A shiver went down his spine, as he allowed himself to climax. His balls pumped for the first time since his morning wank and a fat, thick load of cum poured out of his dick and into Barb's mouth.

The dragoness was visibly caught by surprise, but she had been in the middle of pushing down again, so she could do nothing but try to quickly gulp down the deluge of white, virile semen shooting down her throat. It went so fast, she couldn't keep up and Shining was greeted with the wonderful sight of jizz shooting out of Barb's nose and lips, as her eyes rolled up into her head.

With a plop his cum-stained dick plopped out of her mouth, leaving Barb dazed and with jizz-covered lips, as she gulped down the last batch. Shining grinned, jerking his still hard pole, as he drank in the sight before him.

"This curse is awesome…this is gonna be good..." he mumbled to himself.

Barb meanwhile blinked and seemed to recover her wits a bit. Touching her pouty lips with a finger, she leaned back and looked into the air with a wistful look on her face. "Ooh…oh wow, that was...amazing..." she whispered, absentmindedly licking her lips.

She then caught Shinings look, saw his shit-eating grin and blushed hard. "I-I mean...don't you misunderstand! It wasn't that good. If it wasn't for that dumb spell, I bet your cum wouldn't even taste so..so d-delicious..."

He shrugged in response. "Sure. But you like it, because of the dumb spell. A slutty, little cum-addict. That's what you are now~" He chuckled loudly, jerking his massive dick. "And now that you got what you wanted, Barb, I think it's about time I got what I want."

Barb blushed again, holding her arms against her huge boobs. "W-What do you mean?"

"Well, drop that swimsuit, first," ordered Shining, looking at the rubbery clothing still hanging around her waist.

She hesitated for a moment, but then rose up from the water and sighed. The sight of the water running down her skin, tracing those curves and making everything glisten ever so nicely was so arousing that Shining had to actively concentrate in order not to bust his nut a second time. When Barb then peeled her swimsuit off her waist and sloooowly pulled it down to reveal her bald, fat snatch, it almost pushed him over the edge again!

"S-Swing those hips!" he snapped, breathlessly.

Barb shot him a glare, but obeyed. Her hands stroked her naked body and she began to slowly dance. There wasn't much room to maneuver in the bathtub, but she did her best by swaying her wide hips from the side to side and even got into a rhythm. She did surprisingly get into it after a few seconds, moaning a bit and kneading her huge boobs in front of Shining, while biting her lower lip and throwing his some seriously heavy-lidded looks.

This time, Shining could not hold back and his dick throbbed violently, as another gush of jizz shot out and hit Barb's chest and belly. Ropes of thick cum stained her green skin and even flowed down to her purple thighs.

"Geez...how do you still keep going? Can't be that much in those balls in the first place," complained Barb, staring at the still hard erection in front of her. "Does this ever go away?"

"Not for some time, dear. I usually hit my limit after three hours," boasted Shining.

"Fuck...how does Cadence do it...?"

"She doesn't." Shining reached up and pulled Barb over, so she now stood over him, with her snatch hovering over his throbbing cock. "I fuck her silly and then have my fun with a maid or two. Now go on. I'm waiting~~"

She had a look of surprised awe on her face, though tried to look disapproving at how he was coaxing her to sit down.

Her knees were to either side of him, his cock bending in an arc as it squished against her sopping wet snatch. Hot as well. The advantage of dragons, in his mind. They were living fleshlights with an integrated heating function. One of the reasons Shining missed fucking her.

"...Gosh, you are the worst sometimes," she complained, right before she loudly moaned as she tried to get his shaft into her. Not the easiest of tasks with her lack of an active sex life.

Well, not a lack of an active masturbation life though, Shining knew that well from the times they were under the same roof. Too bad she never took him up on his offer to take another ride though.

Not that it mattered now that he was short before penetrating her yet again. And while it was going slow, he let her have this, deciding to give her some control over this. Not simply out of the kindness of his heart though, but also so he had some leverage later. If she did it out of her own free will, getting her to fuck him again would be trivial.

Her claw had gripped his dick below the tip and held it tight as she did her best to force it in, grunting and looking at it with clear annoyance.

Luckily, he didn't need to wait much longer as the large flared cock head popped in a second later, making her gasp. As cute as it was to see her fumble around clumsily, nothing could beat the heat of her snatch. He groaned, feeling the very narrow passage barely fit and yet it was contracting in a way that felt as if she was trying to pull him in. Maybe her twat had awaited his eventual return and was encouraging him now?

"Ow, ow, ow, fuck! Have you gotten bigger?!" she complained, making him chuckle. "I am serious! I will be so sore after this!"

"You are a flexible dragoness, remember? Give it time," he encouraged, making her scowl and growl. She didn't growl often, so that showed very well how annoyed and frustrated she was with how hard this was on her.

Pretty much showed how much she wanted this as well. Her needy slutty hole moved up and down slightly, Barb not retorting as she decided to put her focus on this. And while it was hard at first, a few times of going up and down did indeed loosen her up slowly and made her sigh, as inch after inch was worked into her.

"I was right," Shining pointed out triumphantly and while Barb wanted to shoot it down, she moaned, making her cheeks flush ever more.

"D-Damn you for being right then. I can feel how much you are throbbing. Ooohhh...it's still sticky with cum..." she said, trailing off with a pause, before shaking herself out of it, as the pleasure began to hit her.

Shining Armor grinned up to her, smugly. "Sure is. You are a hot piece of ass as much as I am a hot piece of cock. And one that missed you."

She gritted her teeth, trying to suppress a moan.

"You did? Why do I have the feeling, you were sleeping around with other dragonesses, after me? That spray of jizz earlier spoke volumes," she pointed out, trying to shoot back in a manner in how much he was wanting this as well.

"And?" Shining asked, cocking a brow. "Can't fault your brother for trying to get it on with some pussy. Smolder was the one coming closest to you by the way. Hope you don't mind I was fucking her behind your back. That little firebrand sure squealed nicely, when I filled her barely legal ass with my rod," he boasted, revealing yet another secret.

No doubt she would have burned his ass had he revealed this earlier, but he had a feeling she wouldn't do so now. Just like with the panties. She was too far gone, too busy with the pleasure melting her small, female brain.

And he was right. Barb was too busy trying to take his hot rod, rather than pay attention to what he was saying. By now, she had pushed down to his medial ring and was openly panting, with her long tongue flopping down her lips.

"Y-Yeah...sure...aaah...what..ever...uuunh~" she moaned, as she pressed her hands against her boobs. Her finger did sink in so deep, that they almost vanished into the soft, pillowy flesh.

Her insides were pressing down on Shining's dick, like they never wanted to let him go. As Barb rose up, he could see her pussy squeezing his cock, greedily trying to keep it where it was. Then she pushed down again, moaning loudly in utter delight.

"I-It's so big. It fills m-me up!" Barb's expression was openly melting, as the sensations began to fill her mind. "Fuuuuuck...this feels sooo gooooooooood~"

"Damn right it does..." grunted Shining, watching in awe as his dick vanished into the dragoness again and again. He was used to seeing the sluts he banged stretch out while trying to take his massive pole. Even Cadence had her abdomen show a clear outline of his dick and she was one curvy mare.

But Barb's newly slutified body was just another level. Thick, curvy, busty...and clearly not obeying the laws of physics. It was as if his member was drawn into a black hole. Her insides just stretched out with no visible issue.

It was amazing!

By now, Barb was openly fucking herself with his cock and had all but forgotten about what she was doing. Shamelessly moaning, she now rode his dick over and over, as she openly climaxed several times. She didn't even say anything coherent anymore, instead just babbling horny nonsense.

"Yes...yess...more...fuck me! Fuck...yesssh...sho good...shoooo fucking goood~"

Hearts were glowing in her eyes, as she drooled all over herself. Her hands openly kneading her boobs and her hips gyrating obscenely more and more. Waves of pleasure ran through her lust-addled brain and her cheeks jiggled nicely with every bounce.

"You bet it is. But how about I help you out a bit?" Shining offered and without waiting for permission had his hands grip two generous helpings of her purple ass cheeks.

His strong fingers dug into it, clinging to it, like her cunt clung to his dick, as he pulled her down further, increasing the pace even further and making her squeal and cry out in elation.

"O-Oh fuck! F-Fuckity fuck fuck fuuuck! YEEEEEESSSSH!" she exclaimed loudly, the water creating a noticeable splashing as her rear crashed down, while the tip pounded against cervix.

This visibly pushed her even further over the edge, as she one climax after the next crashed down on her, making her face melt with pleasure, as her expression devolved into a retarded smile, with her long flopping out. Her desire for more was etched on her face, as Barb began to lose herself in the addictive lust.

And to be frank, Shining yearned for the finale too, as he was getting close.

"I’m cumming, Barb! I'm going to pour my hot cum into your sweet, little sister-pussy!" he yelled. He loved every second of this perverse semi-incest and any thought of holding back or even concern over dumping a full load into Barb’s womb did not even enter his mind.

The dragoness's pussy quivered at the word 'sister' and 'brother' too, showing that even while her mind was in shambles, it could still subconsciously recognize those terms.

Did she have a brother complex?

That thought was shoved aside almost immediately when her ass slammed down one final time, her strong dragon thighs doing this with enough force to create a huge splash that left the bathtub nearly empty.

Shining grunted loudly, as he was pushed once again over the edge and his cock pulsed violently. Hot, slimy sperm spilled out like a hose into the even hotter dragon pussy and filling the womb up to the brim within seconds.

Shining sighed with delight, as he was finally defiling his sweet little dragon sister again, after all this time. She in turn squealed like a slutty pig, pussy squirting heavily as her tongue lolled out. Her eyes rolled up into her head and her expression had frozen into a retarded, bimbo-esque grin.

It looked like her mind blue screened from the immense pleasure that had flooded it. Snapping her little brain like a dry twig and filling all those pretty little thoughts with much more appropriate pictures of dicks and jizz.

So they stayed like this for a good minute, riding out their respective highs. Cum oozed out from Barb’s overstuffed snatch, even as it was still plugged with Shining’s still erect dick.

"You know, you are the sluttiest, little sister alive," Shining told her, not even sure if she would hear it.

"A-And you..a-are the best…degenerate...brother...ever..." answered Barb, with a droopy smile on her face.

Wet towels flew to the side and a cum-covered mop followed.

"You know, with that fat ass of yours, I think I'm gonna watch you clean up more often now," joked Shining, as he leaned against the wall, watching Barb clean up the last pieces of the mess they had made.

"Guess you have to~" she purred back and wiggled her butt. All the gruff demeanor was gone, replaced with a horny, seductive expression that just oozed sexy. Barb stared at his dick again, which was still rock hard. He could see the need in her eyes, just before she slapped her cheeks and shook her head. "Fuck...its getting worse...I feel like a dumb slut..."

"That's because you are one," said Shining cheerfully, shamelessly jerking his cock in front of her. Barb glared at him, to which he only shot back a nasty grin. "Hey, better get used to it. I know I'm gonna plow your thick ass, until that spell is finished with you and you have become a nice, dumb whore."

"And what if Twilight actually does manage to turn this all back? What are you going to do then?" asked Barb, wiping away another thick splotch of jizz from the floor.

"Who says she is going to succeed?" Shining then stroked his dick and a thick glob of cum splattered before his feet. "Oops...guess, you have to clean that up, too~"

Barb rolled her eyes and crawled over to him, naked as she was and with her boobs and ass jiggling with every movement. "You're the worst..." she snarked at Shining, but smiled up at him. Her eyes glowing with resigned lust.

"And I enjoy every second of it," he quipped back.