Author's Note

This is the Eventual Consensual Rape with Genderbending part.

Changeling Sister on the Negotiation Table

After that he pulled out, satisfied with his work while his brother still glared at him hatefully.

“Satisfied now brother?” Pharynx hissed out as Thorax shook his head.

“That is what I should ask you. You were the one that demanded I should be more dominant. Besides that, I’m not done yet. You are after all still left. Aren’t you?”

“Still left? What nonsense are you talking about brother?” the changeling asked now confused.

“The mission was to establish a marriage. Though I am not satisfied yet. Even less with how you have been treating me during this whole affair so...I’m going to use one of the older changeling techniques and will be asserting my control over you.”

With that being said Thorax stepped with his front legs on the table lowering his glowing horn to the struggling changeling’s head. Once contact was made Pharynx felt a certain pressure building in his mind as certain parts seemed to get rewired. Parts about a section of his identity. He tried to push back, but his influence easily caved under his brother’s dominance.

Barely a minute later Thorax pulled back, stepping off the table as the darker changeling grunted out, his body shaking.

With that it started. Pharynx had only enough time to yelp before his body suddenly changed. First he felt his antlers becoming more slender and curvier, followed by his entire face shifting, his hard edges softening giving him a feminine look about it. It continued on from his neck downwards, his cries suddenly turning more high-pitched in their distress. His trained form meanwhile became lighter, edges rounding and giving him a flatter stomach and a more feminine curve. Then came his butt. The once so flat and firm carapace rounding out and puffing up, giving him a generous juicy looking backside. Not quite like Celestia but certainly more than that of normal mares. Lastly his cock and balls slowly vanished completely, and instead a set of full pussy lips formed. In the end of the transformation Pharynx’s new body was that of a curvy soldier that would cause many wet dreams.

Overall Thorax was very happy with the changes and wished he would have had such a sexy sister beforehoof.

“W-What did you do?!” squeaked the now female changeling.

“What I should have done to you for a while, sister. Though I never thought I would have to use one of the old Queen’s tricks to assert my will and with that a gender change on you, it is quite the useful tool for unruly beings like you.”

“I-I’m your family! I-I protected you!”

“And that is the reason why I am so lenient. I will keep you at my side, just like Luna and Celestia. A slutty changeling for my personal herd.”

Just as Thorax finished that sentence his eyes went over Pharynx’s newly formed virgin marehood. He couldn’t help but lick his lips, making his sister cross her legs in a new sense of unease.

“Seems like you turn out to be the spoilsport now sister,” he reprimanded her before his horn lit up, the glow encompassing the female changeling yet again. He then lifted her up before turning her around and lowering her belly to Luna’s.

“Y-You are not serious, are you?” Pharynx asked as she looked back though her brother didn’t answer. Instead he grabbed her flank, kneading the plush ass with his hooves and whistling in approval and showing how serious he really was.

“It is plush but firm, showing off quite well your muscles still. I certainly can appreciate that.”

“D-Don’t you dare!”

“Or what? Are you going to embarrass me with old stories about how you made me hit myself?”

Pharynx grimaced, keeping quiet and not sure how to react to her brother’s statement.

“I…” she finally tried, but still couldn’t come up with an answer as she thought on it and the many interactions they had. Her head was turning back forwards as she continued to mull it over.

It was then that she noticed that Thorax was right in a way. She was almost always a rather big jerk towards him, seeing all he did in a more negative light, despite him actually managing to become the leader of the hive.

A wave of regret washed over her the more her mind dwelled on it. She felt like she had to right it somehow.

“Thorax I-AHHHHHHHHHHHHHH~” she started but was interrupted by her own surprised cry as suddenly without warning her brother’s cockhead was forced into her tight pussy. And it was tight. Even more so than Celestia and Luna, making the King grunt as he forced this new hot cavern open. His cock at least was lubricated more than enough for this task.

“Tight one. Aren’t you sister?”

“T-Thorax! S-Stop this nonsense this instant!” she warned, but Thorax scoffed, not unlike her own scoffs, making the changeling mare fume while adopting a cute pout.

“No can do sister. Y-You deserve this, so I’m not going to stop until I have impregnated you as well!” he asserted as he started to move, his shaft moving inside and out of her, starting to rock the smaller changeling’s body. Much to her own confusion this actually affected her. She felt the cock scraping over new nerves she never experienced before. Something that felt good in its own strange way she tried to mentally block.

It went about as well as one expected as her body reacted, her pussy producing its natural juices as it was stimulated by the majestic member of her King and brother. She could do little more than bite her lip as she cutely grunted, trying to hold any pleased noises in.

Though it was a losing battle. Barely a minute in had the mare’s slit winking erratically.

Feeling a mischievous side in Thorax pop up he grabbed her button in his magic squeezing it. The resulting spike of pleasure threw his sister off, making her moan out loudly, clear for all to hear.

It was a sound that made Pharynx gulp as her eyes gazed back at her brother who spotted a predatory grin.

“Is that a moan you little slut? Are you enjoying your new body a bit too much?” Thorax mocked making her blush.

“I-It’s nothing like that idiot!” she quickly uttered, turning her head away in embarrassment.

“Really now? Let’s hear these cute sluttish bits of nothing a bit more!”

After saying that he increased his pace, his cockhead diving in deeper and deeper into his sister’s folds. Thorax certainly was surprised to find that he could go in really deep without finding the entrance of her womb. Another interesting feature to his sister. Something he planned to explore further in the future. For now he was interested in following up with his intentions, which is why he made sure to go as deep as he could into that hot tight hole, making his hips smack into Pharynx as she tried to hold her pleased sounds back.

It felt rather rewarding to him as her grunts quickly turned more into cries of pleasure. Her pussy slowly became more accommodating too, getting adjusted to his form and welcoming his thick rod openly as it seemed to pull him right in.

His sister certainly was enjoying herself, even if she refused to admit it.

And then she came.

Her juices splashed against his cock and balls, her walls constricting as he pushed through the resistance carrying on with his speed and making sure to fuck her right through her climax as she cried out loudly.

Once she was done she was quiet. Or tried to be quiet as if hoping she could hide herself is she just kept her mouth shut.

“Seems like my sister is a whore who gets off on having her pussy fucked hard by her brother,” Thorax teased.

“I-I’m not,” she denied quietly and Thorax simply chuckled.

“Yes, you are. And you will be cumming on my cock everyday from now on as well. I will fuck you right as you wake up, even before the slut sisters. And you will go to bed sucking on it like a good little bitch at night,” he purred in a husky voice that sent tingles down the newly transformed mares spine.

“B-But we are siblings! You can’t do this!” she tried to deflect even as her pussy clenched on his prick.

“So? Honestly, this makes it only better for me. To fuck the virgin pussy of my own sexy sister and make her fall in love with my cock. It is also the dominance you always demanded from me. Would I have done with my first crush, what I right now do to you, you wouldn’t have complained.”

“T-That might be but this is different!”

“How? If I was female, I doubt you would have hesitated to use me in such a manner. Be honest. A weak little female changeling sister is something you would have preyed on as payment for your protection.”

‘I-I would…” Pharynx admitted in her thoughts as images of a weak female changeling sister invaded her mind. It wouldn’t have stayed with words and making her hit herself. She would have claimed her properly.

“Besides, you are enjoying yourself, so you might as well get used to it, seeing as you will join my royal herd anyway.”

“W-Wait, herd?” she asked, that one word bringing her back from her debaucherous thoughts of an alternate sibling.

“Of course. Or do you believe I would simply fuck you just as hard as the royal whores if I wasn’t planning on bringing you into this as well. You were planned in the royal wedding too. It just changed in the regard that you and Luna will belong to me now.”

“I-I will never agree to become your slut wife!”

The King grinned at that line, leaning closer to her ears, “Oh, I was hoping you bitch would say that.”

After that Thorax positioned his front legs on the changeling’s shoulders, gripping them tightly before he continued to ram that attractive piece of ass in earnest.

Pharynx struggled as she tried to hold on, but with how Thorax continued to stimulate her nerves and how he actually had her sensitive love nub in his magical grip, playing with it, she could hardly hold on, getting sent into another strong climax that left her eyes unfocused and her mouth panting by the end of it.

He didn’t slow down. He wasn’t going to go easy on her. And his stamina certainly was rather impressive as she couldn’t feel any indication that he was close to cumming.

“You are so preeeetty!” Luna meanwhile giggled drunkenly before slobbering over Pharynx’s lips in a messy kiss. The Princess, despite her thorough fucking still seemed horny enough to engage in some fun with the changeling mare.

The pleasure drunk Pharynx could hardly fend the Night Princess off, surrendering to the sloppy make-out session as she felt the mare’s tongue shoved right into her maw.

She could only moan as she continued to get fucked, Thorax seemingly never tiring.

The continuous slaps echoed against her wet plot, strings of arousal connecting her with the King, before ripping apart as he pulled out and then forming anew after his hips collided with her juicy plot.

Luna simply licked away at the cum on her face while Pharynx moaned, looking straight ahead, only to be blindsided by another kiss. The perfectly white lips of the Sun Princess appearing in front of her and capturing her as she cried out into her mouth.

The kiss was broken as Celestia intently stared at her sister and the two changeling siblings, seemingly taking the perversion of incest in. As if drawn in by this concept, or maybe just driven by her heat she then also captured her sister’s lips in a kiss. The darker mare surprised at first, but didn’t protest.

Thorax grinned, loving the show as he was seesawing into his sister’s cunt. He groaned out in bliss as his balls slapped against her. He was feeling that said sweaty orbs were about ready to empty his payload deep into his sister.

“I’m cumming! Best be ready sister, because I’m going to breed you like the little slut you are!” he announced, making her sister’s eyes widen in horror.

“N-Noooo! N-Not inside!” she cried out, weakly struggling, before a moment later Thorax did just that. His movements ceased as his cock was nestled deep into her, before his mighty rod fired thick slimy ropes of seed deep into her.

Pharynx groaned, her pussy quavering in another pleasure-filled high as she felt a distinct hotness in her belly.

For a minute nothing happened after that. Nothing but Thorax’s cock spurting his loads into the the smaller changeling mare. Once it ceased and nothing else happened she piqued back up.

“I-Is it over?” Pharynx wondered with a tone split between relief and disappointment.

A sinister chuckle emanated from behind her, but before she could turn her head Thorax started to move again, making the surprised changeling mare yelp as her sensitive walls were once again violated as her brother’s cock continued to scrape over them.

“It is not,” he simply stated as he proceeded.

This continued on for four hours. First Pharynx still tried to hold back, her moans stifled. Then she screamed out as her sensitivity increased with each load, her mind being overloaded with sensations. After that she felt herself slowly moving her hips back into him as Thorax chipped away at her last bit of resistance.

Eventually she caved, and after the fours hours of nothing but pleasure she ended up bouncing on her brother’s cock out of her own free will as he laid on his back on the table, a Princess in each of his forelegs snuggling into him as he enjoyed his sister’s servitude.

She could do little more than moan as she felt the cock rubbing along her insides, a needy smile on her lips as Thorax grinned.

His herd was complete.

8 Months Later

Pharynx trotted down the corridor of Canterlot castle.

Her large pregnant belly swayed with each step she took as she went to the large private study most of her herd would be at.

She hummed in thought. A lot of things had happened since that fateful day.

Back then she had awoken something in Thorax. Another side of him much more fierce than Pharynx ever imagined.

And a side Pharynx ironically would have to control. At least after she got back to her senses.

She couldn’t count the times how often she had to hold her brother back when a female showed even an inkling of disrespect. She wouldn’t have to be a bitch. Just a simple misunderstanding was enough for Thorax to want to assert his dominance over her. It was only with lots and lots of effort on her part, which involved offering her face up to his cock in some bouts of violent facefuckings, that Thorax didn’t lay half the castle.

This dominance would have been admirable if Thorax didn’t cause her more work in trying to cover for him. Or the many times she had to ‘convince’ him to let it go.

But then again, she actually had gotten used to her female body and the bribes she had to administer to calm her brother, so that wasn’t necessarily that bad. Especially seeing as how she secretly was enjoying even those times he uses her face. Though seeing how she always rubs her hoof into her marehood needily when that happens, it probably wasn’t that big of a secret to her herd.

All in all things went rather smooth interestingly enough. Their forming of a herd in a marriage might have had some enemies, but nothing one couldn’t solve in the end.

Finally she came to the doors. Soundproof. It was rather awkward to explain the loud obscene noises from their first time, so it was safer that way. The Princesses needed to act regal in public, and squealing out and begging for cock like whores daily certainly weren’t noises the public should hear.

She then stepped into the room, making sure to close the door quickly to see Thorax dismounting from Luna, his wet messy cock no doubt pulling out of her cunt as the mare turned her head to him, an argument clearly going on.

“B-But it is Nightmare Night! I-I do have to go back out and hold a speech!”

“Do I look like I care?” he teased her as one hoof fondled her rear, “You will simply do it with my seed dripping out of your impregnated hole, leaving a nice trail of cum behind wherever you go. Is that clear?”

Princess Luna shivered delightfully as she shrunk back under his intense gaze.

“C-Crystal,” she affirmed, making Pharynx roll her eyes. Luna certainly was a glutton for punishment. Often enough she provoked and challenged their King just so he could give her some degrading task to fulfill in public. The changeling mare started to think her fellow wife has an exhibitionism kink.

“Ah, you are back sister?” Thorax asked her as he turned to the mare.

“I am reporting back for duty,” she nodded bowing her head and closing her eyes in a clear sign of submission.

Seconds later she could feel the cum-stained tip of his cock poking her muzzle as he had stepped over her.

Her eyes opened and she obediently opened her mouth suckling on the salty tasting head.

“Good. I was in need of your services anyway,” the King said, but before the mare could go further he used his magic to prop her up in a sitting position with her back against the desk. He then stepped over to her with his forelegs standing on the table, his shaft again pushing against her lips.

She opened her mouth without hesistation, just as he started to buck his hips, sinking his cock deep into her throat. Soon wet noises emerged from their position, the mare’s face smeared with spit and pre as she was facefucked by her brother.

A hoof wandered past her pregnant belly and to her slit as she rubbed furiously on it, moaning on the cock as her tight gullet massaged it rhythmically like she had done so many times before.

In her position she didn’t even notice Luna pouting as she left the room.

Pharynx was a wet mess by that point, simply going with the flow and enjoying herself as she was used like an onahole for her brother’s pleasure.

This was her duty. To her King, Husband, and Brother.

Thorax was her responsibility, so she would continue to support and serve him like a responsible older sister. She would help him, even as her brother continued to rut her senseless and would breed her with many of his hatchlings.

She delighted in the tasty pre as she worked to make him cum. Now and forever.