Futanitiation

by AmtrakBrony

Rating: mature
Tags: Romance, Random
Length: 8931

Twilight Sparkle is now a princess, but in order for her to become officially installed into the monarchy, she must go through something that she never saw coming.

Twilight Sparkle is now a princess, but before she can be officially installed into the monarchy, she must go through something that she never saw coming.

Sorry, make that 'cumming'. :trollestia:

*Warning: Contains [spoiler]futa, sister-in-law incest, F/F, F/F/F, and penetration of all three holes[/spoiler].

*Takes place on the night following the events of "Magical Mystery Cure."

Published 1970-01-01 00:00:00 UTC
Last updated 2015-10-18 23:31:08 UTC

Becoming One of Them

Twilight Sparkle, Equestria's newest princess, settled into her bedroom at Canterlot Castle as Princess Luna's moon rose into the sky. Given the events of the past 24 hours, from her surprise transformation to her coronation the following morning and multiple events throughout the capital city, the young pony was quite tired. She had been told to stay in Canterlot that night while her friends and family went back home. She didn't know exactly why she was told to do so, but she loved Canterlot very much, as it was the city she grew up in.

The purple unicorn-turned-alicorn levitated her new crown off her head and placed it on the bedside table before climbing into the massive queen-sized bed before her. It was covered with a thick, purple comforter with white sheets underneath. She pulled the covers over herself and lay back, eager to feel her body relax on the soft mattress. Unfortunately, her new wings were the first to touch the white sheets, and she quickly remembered that she was going to have to sleep in a different position. This was a problem she had had the previous night on the train when she and her friends came to Canterlot for the ceremony. "Ugh..." Twilight groaned to herself as she sat up. She spread her wings in an attempt to be able to lie on her back, but when she tried, it didn't work. It was putting too much stress on her new joints.

Twilight eventually resorted to laying on her stomach. She had never slept like this at home, and she wasn't sure it would be comfortable. Thankfully, she was able to relax into her bed and didn't have to worry about anything pressing against her wings. She levitated the covers over her body once again and turned her head sideways, resting it on one of the white, fluffy pillows. The blanket and comforter only put light pressure on her wings, but she could easily handle it, as the main sensation travelling through her body was the warmth that circulated under the covers, slowly making her eyes close more and more until she was finally asleep.

Twilight awoke to the sound of somepony knocking on her door. She stirred slightly, annoyed that what was a decent sleep had been interrupted. She sat up and looked across the darkened room, trying to find the clock on the wall. The alicorn lit her horn, which illuminated the majority of the room around her. She soon found the clock, but became very displeased once she saw what time it was. "It's midnight..." she groaned, getting out of her bed, "Who could want something this late?"

The purple mare stood in front of the door and opened it with her magic, looking out into the night. There was nopony at her doorstep, which annoyed her even further, but she noticed a note on the ground in front of her, and it had her name written in some familiar writing. She quickly unfolded the note and read it to herself. It said:

Dear Princess Twilight Sparkle,

You are needed in the room on the castle's lowest level immediately. Please do not delay. This is a very important matter.

Signed,

Princess Celestia

A small amount of adrenaline ran through the young princess as she realized that she could not wait until morning to tend to this new matter at hoof. Assuming this was serious royal business, she turned back to her bedside table and took her crown in her magic, placing it back on her head before closing the door and racing down the spiral staircase, wondering what her former mentor had in store for her.

After careful navigation of multiple hallways, Twilight eventually found the curved staircase within the castle that she needed to descend. It was dark, the walls and stairs an eerie mix of gray and black that seemed like a staircase leading to a dungeon. Gulping, the princess started trotting down the steps, not being able to see what was at the bottom. Every twenty or so steps, the amount of light that surrounded her slowly faded away, making her that much more nervous. She had never visited this part of the castle, as she had assumed it was a secret dungeon that she didn't need to know about.

Slowly but surely, Twilight climbed down the 400 steps until she reached the large, steel double doors that rested in-between two flaming lamps on the wall. "This must be it..." Twilight thought to herself. She had no idea what was going to happen when those doors opened. Was she going to be punished for something she didn't know she did? Was she going to be dethroned in secret? She could only speculate until it happened.

Twilight nervously knocked on the door, the sound echoing up the staircase in a very creepy fashion. Once it faded, Twilight could hear nothing from behind the doors, so she reached her hoof up to knock again, but she stopped when a small hole in the door opened, and she could briefly see a pair of eyes looking down at her before the hole was closed shut, and then she heard a couple of hefty locks being undone. Finally, the two large doors opened, a cloud of dust forming around them as the decently lit room shone its light before her. When the dust subsided, Twilight could instantly make out who was in front of her.

"Hello, Princess Twilight," came the voice of Princess Celestia. It was low and husky, something Twilight had never heard from her former teacher. "Please come inside. We have some important business to take care of."

"What's this all about?" Twilight asked as she entered the room.

"You need not worry, Twilight," Celestia said, closing the double doors behind Twilight, "You are not in any trouble, if that's what you're thinking. You are here for your official initiation."

"Huh? Didn't that happen this morning?"

"That is what everypony thinks, Twilight," came another voice which Twilight quickly made out to be that of Princess Luna, "But to officially be recognized as a princess of Equestria, you must go through a process which we will be performing on you now. It is a tradition that we princesses have all partaken in."

"Wh-what is it?" Twilight asked, nervously.

"It's very simple," Celestia replied, "You will have to grow one of these." The white alicorn then turned to her side and made a certain part of her underside visible to her former student.

Twilight couldn't believe what she was looking at. In-between Celestia's hind legs was a fully erect and anatomically correct stallionhood, complete with a pair of lemon-sized testicles. True, she had seen stallions in a horny state before, but the fact that there was a full set of male genitalia on a female, especially Princess Celestia, caused her brain to go haywire. The mere sight of it almost made the purple alicorn vomit, but she was able to hold it in. "Wait...you've...all gone through this?" she asked Celestia.

The immediate response, however, came from Luna. "Of course," she said, prompting Twilight to turn around and face her, "Like I said, it is a tradition that we intend to keep alive." It was at that moment that Twilight saw the biggest, blackest horse dick she had ever seen in her life, along with a set of nuts the size of Celestia's. Now she was looking at not one, but two mares with male body parts. Nothing science-related in Twilight's brain could make sense of the situation. How was this possible?

"Hold on," Twilight spoke, "What about Cadance?"

"Oh, I'm here, too. Don't worry," Cadance replied, coming into Twilight's view. Like the other two alicorns, Cadance had her own fully erect member and hefty balls on display for all to see.

One of Twilight's eyes began to twitch. How could she not have known that this was coming? She had never seen any of the other princesses with these body parts before. At this point, Twilight had been officially mind-fucked. "S-So..." Twilight began again, "I-I have to get...o-one of those?" she finished while pointing to Cadance's stallionhood.

"That is correct, Twilight," Celestia responded.

"B-But how? You're going to use magic, right?"

"Well, sort of. You see..." Cadance said, "We're going to fill all of your...holes...with our...seed. It's laden with magic that will make you grow these extra body parts," she finished with a blush, feeling a bit awkward having to say something so erotic to her sister-in-law. Twilight herself was completely motionless. Cadance's blush faded as she spoke up again. "But, once you're all done with it, it's really not that bad. Celestia had to do the same thing with me when I became a princess. At first, I thought it was really weird, but now, I'm totally used to it. It's actually kind of a fun thing to have. It's like a little secret that we princesses share, since barely anypony else knows we have them."

Twilight remained frozen in place. Her eyes were wide, her heart was beating rapidly, and it almost looked as if she wasn't breathing. This is what she had to wake up in the middle of the night for? THIS? A secret second transformation? She didn't know what to think. Her common sense was telling her that this was completely unnecessary and downright lewd, but at the same time, the scientific part of her brain made her curious. She had only read about equine anatomy in school, but she had never experimented with it in real life. Now, she was being told that she would grow a set of male genitalia all her own. She would be able to perform countless experiments with it, pleasuring herself and studying what happened. True, she had pleasured herself multiple times, but the thought of feeling pleasure from a long, thick cock gradually made her wet with desire.

"Aside from the enjoyment aspect, Cadance," Celestia said, "Going through this process makes you one of the most unique ponies around."

"But..." Twilight said, "Doesn't being alicorns make us unique? There's only four of us."

"That's what she thinks..." Celestia thought to herself.

"It does," Luna replied, "But this makes us...more unique," she finished with a sly smile.

Now becoming more curious than ever as to what it would feel like to have a stallionhood, Twilight, whose arousal had begun to form a tiny puddle under her rump, asked, "So...what do we do first?"

"I suppose it would be optimal if we did everything at once," Celestia replied, "But I think it would put us in a rather uncomfortable position."

"Perhaps Cadance can lead the way," Luna said to Twilight, "Then my sister and I can do our part at the same time."

Twilight immediately grew nervous at the mere prospect of what Luna had just suggested. She had never had intercourse before, and now her first time would involve double penetration. Still, her curiosity and arousal were doing a decent job of steering her away from those thoughts. "Ummm...yeah. I think I'd be okay with that," Twilight responded.

"Great!" Cadance replied, "Let's get started."

Twilight sat down in front of her sister-in-law, her eyes fixed on the dark pink phallus that was connected to her underside. She paused, then looked back at Celestia. "I have a question," the purple mare said, "Will I still have, you know...my other parts after this?"

"Absolutely," Celestia replied, turning around to show her that she still had her own marehood above her hefty ballsack.

"Okay," Twilight said, turning back to her sister-in-law. "Cadance," she asked, "Is Shining Armor okay with this?"

"Oh, of course," Cadance replied, "He's one of few who know our secret outside of ourselves, and he knows that royal business always comes first."

"Good," Twilight responded, "So, which part of me are you...well, going to put that into?"

"It would be best if we start with your mouth." Twilight's eyes widened slightly, becoming the slightest bit nervous that she was going to be putting that in her mouth.

Twilight eventually agreed, and she scooted forward until the tip was mere inches from her muzzle. She took a few sniffs, the musk coming from the pink alicorn not being as pungent as she thought it would be. It actually made her relax. Twilight leaned her head forward, the tip of her muzzle making contact with the tip of Cadance's cock. "Am I going to be able to fit this in my mouth?" she thought to herself. She told herself that she wouldn't know until she tried, so she stuck her tongue out and started to slowly lap at the tip, the action sending a shiver through its bearer.

Twilight soon opened her mouth all the way and began to encase the tip in it. The tip itself was the widest part of the cock, and Twilight was able to fit it all the way into her muzzle, sending more pleasured shivers through her sister-in-law.

Wait. Hang on. This was Cadance. Her sister-in-law. Her old foalsitter. One of her best friends. For some reason, a long flash of memories came into Twilight's mind. She thought of all the amazing times she and Cadance had throughout the years, and now was beginning to realize just how much she loved and appreciated her. Now was the perfect time to express those feelings through actions.

Twilight moved her head forward, slowly beginning to bob up and down on Cadance's cock. With each movement, she could hear moan after moan coming from above her. "Ahhh!" Cadance cried out, "Twilight! Yes! That's perfect! Keep going! Ahhh!" Twilight did as she was told, not ceasing her ministrations in the slightest as she began to use her tongue and hooves to pleasure Cadance that much more. She could already taste the pre-cum leaking from her tip, the surprisingly sweet taste pushing her on, hoping to receive more of it as she continued blowing the pink alicorn.

Twilight's hooves started moving up and down faster and faster, her head not moving as it held just a little more than the tip inside it. She could feel the veins throbbing madly as Cadance's heart rate increased, Cadance herself panting heavily as sweat began rolling down her forehead.

The pink mare's eyes were halfway open, and she began to feel a familiar pressure start to build as the alicorn below her pleasured her. "T-Twilight!" Cadance cried out again, "Ahhh! I'm close!" She instinctively grabbed Twilight's head and held it in place, not wanting the sensations to end.

Twilight herself was a bit taken aback by Cadance's actions, so she looked up at her. Cadance looked down and said, "Ahhh...make sure you swallow it all, Twilight. Otherwise this whole thing won't work." Twilight nodded, immediately going back to pleasuring her sister-in-law and preparing herself for what was to come.

The pressure continued to build inside Cadance's loins until she could hold it no longer. With a primordial scream, she threw her head back and let herself go, her white, hot seed shooting out of her stallionhood and into Twilight's mouth, all while she orgasmed out of her marehood, as well.

Twilight was unprepared for what shot out of Cadance's tip, the first long, thick rope hitting the back of her throat almost instantly. She miraculously swallowed it without choking, and not a moment too soon, as the next one prevented her from drawing in a much-needed breath. As Cadance rode out her orgasm, Twilight did as she had previously been told to do, swallowing every last drop of cum that shot out of Cadance's member. To her surprise, just like the pre-cum, the actual seed was really sweet, almost like raw, liquefied sugar. She hummed as she savored the wonderful taste.

Soon, Cadance ceased cumming inside Twilight's mouth, and Twilight herself gave one last suck and held it, pulling her head back as she drew the last of the cum out of her sister-in-law. She eventually detached, but not before sticking the tip of her tongue into the small opening at the end of the penis, making sure she got every last bit of cum, as if she was triple-checking all of her already double-checked checklists back home.

Twilight finally swallowed the last of Cadance's cream, sighing as she lay backwards, relishing in its warmth. Unfortunately, her cozy state was interrupted by Celestia, who quickly stood over her. "Well done, Twilight," she said, "Now Luna and I must get started filling the rest of you up."

Twilight had almost forgotten that she was going to be rutted from both of her rear holes. She looked up at Celestia, a worried look on her face. "I-I've never had sex before," she said, quietly, "I was hoping my first time would be with a stallion."

"Do not fret, Twilight," Luna said, reassuringly, "We will be as gentle as we can. Plus, you will not feel any pain."

Twilight looked puzzled. "How?"

"Let me explain that," Celestia said, "When I performed this on Cadance, she was a virgin herself, but she did not feel any pain. I, like her with you, started with her mouth, and the seed acted as sort of a local anesthetic for what came next."

"Interesting..." Twilight replied.

"I believe it is time we get started, sister," Luna said, "Don't you think?"

"I agree, Luna," Celestia replied. The white alicorn then looked down at her former student. "Twilight, please stand up. There is something I need to do for preparation purposes." Twilight did as she was told, and Celestia quickly noticed that the new princess had been getting quite turned on from what she had just done with Cadance. "And I believe you have provided me with the most ideal way to do it."

Twilight once again looked puzzled, but brushed it off as soon as Celestia stood over her once again. Twilight could feel the large tip of Celestia's stallionhood press up against her labia, and, without warning, she felt it enter her. "AHHH!!!" Twilight shrieked. She hadn't expected her former mentor to proceed so quickly, but she couldn't help but feel an immense amount of pleasure from being spread wide. All of a sudden, Twilight could feel a tearing sensation inside her, and she knew exactly what it was, but once it finished, she was surprised to find that she felt no pain. "Celestia was right," she thought to herself. Cadance's semen had somehow numbed her in the precise areas where she would feel pain at this moment, and all she felt was pure, raw pleasure.

Unfortunately, that pleasure was short-lived as Celestia pulled out of her completely, the white alicorn's member already coated thoroughly in Twilight's juices. "Please hold still, Twilight," Celestia said, prodding her former student again. This time, however, she aimed for the other hole, and Twilight gasped upon feeling Celestia poking at her tailhole. She was nervous, and because of that, her anus was clenched tight, not wanting to accept the large cock that threatened to stretch it beyond its limits.

All of a sudden, Twilight felt a new tingling sensation throughout her body. She felt herself relax, and at the same time, she became more aroused. She had to assume at this point that Cadance's seed was not only acting as a local anesthetic, but also as an aphrodisiac.

Celestia quickly noticed Twilight becoming more relaxed and pressed forward, trying to press the head of her erection into Twilight's anus. Thanks to the lubrication, she was able to slip the head inside with ease. Twilight moaned at the completely alien sensation, her butthole immediately clenching down on the intruder, despite the relaxed state she had been in earlier.

Soon, Twilight relaxed again and Celestia kept pushing herself inside. About twenty seconds later, Celestia had pushed her cock completely inside her former student's rear, reaching depths that Twilight didn't even realize were there. "Ooooohhhhhh!!!..." Twilight moaned, feeling more filled than she'd ever been in her life.

Not even a second later, Celestia wrapped her forelegs around Twilight and sat down, both of them still connected as she and Twilight sat upright. During the movement, Twilight's new crown slipped off her head and started falling to the ground, but before it could, Princess Luna grasped it in her magic. She then brought forth a small pillow from a corner of the room and placed the golden tiara on it and set aside. She then walked in front of Twilight and Celestia, her large member still fully erect as she sat down in front of them.

Luna placed her forehooves on Twilight's shoulders, lining her cock up with Twilight's 'main' entrance as she looked her in the eyes. "Are you ready?" she asked.

Twilight glanced up at Celestia's face, then back at Luna. "Mmhmm," she mumbled.

Taking the initiative, Luna pushed forward, spreading Twilight's now slightly loose cunt as her massive member became enveloped in the younger alicorn's warmth. Soon, she was all the way in, the tip resting dangerously close to Twilight's womb as the Princess of the Night wrapped her hind legs around Twilight's and Celestia's hips.

Twilight was now sandwiched between the two royal sisters, their cocks deep inside both of her lower holes. She looked up at both of them, and they smiled down at her. At that moment, Twilight began to remember all the time she had spent with Celestia when she was still her student. She had become a second mother to the young mare, and she loved her very much, but she never could have imagined loving her this much. Being this close to her former mentor gave Twilight a feeling of indescribable joy and pleasure as she leaned up against Celestia's soft, white chest. At the same time, Twilight couldn't help but develop further affection for Luna, as well. Though she hadn't known her as long as she'd known Celestia, she had turned her life around drastically, teaching her the importance of friendship. Ever since then, the two had been seeing each other more and more often, and they always enjoyed it immensely.

As Celestia and Luna surrounded Twilight with their massive wings, they each started to slowly move inside the young princess. Luna pushed in first, her tip poking against Twilight's womb, making the purple mare scream in absolute bliss. As Luna pulled back, Celestia pushed upward, sinking her member deeper and deeper into Twilight's rear. The two of them alternated these motions as Twilight moaned and cried out in pleasure.

There were no words to explain how Twilight was feeling. She had never been this close to Celestia and Luna, and now that she was, combined with the fact that she had just blown her sister-in-law, she couldn't help but feel that this would be a night that she would remember forever and would always cherish.

Overcome with affection for the royal sisters, Twilight leaned forward and caught Luna off guard by pressing her lips to hers. Luna quickly took the initiative and pressed her lips back against Twilight's, turning her head at an angle to allow the highly-anticipated tongue play. A few seconds later, Twilight stuck her tongue out, poking against Luna's lips. The midnight blue alicorn obliged, parting her lips to allow her and Twilight's tongues to meet. Both mares moaned into each other's mouths as their bodies were racked with intense pleasure.

Twilight soon pulled away, a trail of saliva hanging between her lips and Luna's. As it fell away, Twilight tilted her head upward and looked at Celestia, hoping that she'd notice her. Forunately, she did, and she immediately kissed Twilight's waiting lips, not waiting even one second before sliding her tongue into her former student's mouth. Every time she pressed her lips further against Twilight's, Celestia would give a very deep thrust into the purple alicorn's rear, making the mare moan loudly into her mouth.

Soon, everything became too much for Twilight. The feeling of two stallionhoods penetrating her at the same time caused the heat in her loins to grow seemingly exponentially. "Ahhh!" she exclaimed, her voice laden with pure lust and pleasure, "I-I'm gonna cum!"

At that moment, Twilight felt another new sensation hit her. She looked down and noticed another hoof rubbing her swollen clitoris, and then she realized who that hoof belonged to. "Now, Twilight," Cadance whispered seductively into her sister-in-law's ear as she applied more pressure to the purple mare's love button, "Cum right now. Let it all out."

Twilight screamed in pleasure as she felt more and more pressure throughout her body. Then, all of a sudden, she felt Cadance press her lips to hers, immediately shoving her tongue into her sister-in-law's mouth. That was it. Twilight's ticking time bomb of a pussy exploded, clenching madly around Luna's stallionhood and letting loose a copious amount of marecum, coating Luna's cock and scrotum in her fluids.

At the same time, both royal sisters moaned in unison as both of Twilight's holes clenched tightly around them, tipping them both over the edge. Simultaneously, they released their massive loads into Twilight's vagina and asshole, filling them in an instant. Twilight moaned audibly as she felt the hot, sticky fluid enter her passages, the heat nearly causing her to go unconscious. Thankfully, she never did, and she was able to experience every little pleasure-laden moment as Celestia and Luna filled her to the absolute brim.

After a while, the orgasms of both the royal sisters ended, and they magically levitated Twilight off of them and set her on a nearby mattress. Twilight could only bask in the warmth of the princess' seed for a short time before she felt yet another tingling sensation sweep over her body, primarily in her nether regions. She sat up and looked down, watching her clitoris painlessly split into two before the new upper half started growing. It got longer and longer, wider and wider, and Twilight could feel two unfamiliar sphere-like objects form inside her and descend down into a new, fleshy sack that hung just below her marehood, both parts clearly visible. Soon, what was once Twilight's second clit had finished growing, and what was left was a long, thick, dark purple cock with a ball sack of the same color hanging behind it.

"It appears that the seed has done its job, Princess Twilight," Luna said, happy to see that her sister's former student now had the same body parts as the rest of them.

"Wow..." Twilight said, looking at her new appendage, "It's...interesting. So, does this mean you officially recognize me as a princess now?"

"That is correct, Princess Twilight Sparkle," Celestia replied. Twilight smiled, happy that the process was over and done with and that she was officially a princess to the other three mares in the room.

Twilight then yawned. She then looked up at Celestia and asked, "May I go back to bed now? It's been a long day."

Celestia, along with Luna and Cadance, gave Twilight a devilish smirk. "Oh no," the white alicorn responded, "We're not quite finished yet..."

Returning the Favor

"Wait, what?" Twilight asked, puzzled. She had already finished growing her new cock and balls, and she thought she was done already, but that, apparently, was not true.

"Not yet, Twilight," Luna replied, "In order to complete this process fully, you must make sure your new stallionhood is working properly."

"And...how do I do that? Do I just pleasure myself right here in front of you?"

"Not quite, my dear," Celestia replied.

"Let me explain, Twilight," Cadance said, "You see, when this happened to me, I had to release my own seed inside Celestia. You're going to have to do the same thing, but since there's three of us, you'll have to do it three times."

Twilight once again stood motionless in front of the other princesses. Was she really going to have to engage in intercourse with all of them? True, she had basically just done that, but this was different. Instead of having a part of them inside of her, she would have to put herself inside of them. Still, while her common sense seemed to be holding the world's largest protest in her brain, her scientific curiosity made her want to feel the pleasure that came from having a penis.

Smiling weakly, Twilight asked, "So...who am I starting with?"

"Whoever you choose, Twilight," Celestia replied.

Twilight then thought about her options for a few seconds. "Cadance," she said, looking over at her sister-in-law, "I think I'll start with you."

"With me? Again?" Cadance asked.

"Sure! Why not?"

Without saying another word, Cadance levitated a king-sized mattress from another corner of the room, set it in front of Twilight, and then laid down on her back. She spread her legs, and Twilight realized that her sister-in-law had already become aroused, her dick at full mast and her pussy already soaked. "Did...did she get turned on by what I did with Luna and Celestia?" she thought to herself. She immediately brushed it away and climbed over Cadance. "Are you ready?" the purple alicorn asked.

"I'm ready whenever you are, Twilight," Cadance responded.

Before Twilight got herself fully into position, she took another glance at Cadance's marehood. Technically, she had already tasted her juices, but at the same time, she hadn't. She reached a forehoof down to the pink alicorn's nether regions and asked, "D-do you mind if I...?"

"Go ahead," Cadance replied.

Twilight felt extremely awkward asking such a question to her sister-in-law, but at the same time, in her curious and aroused state, she wanted to know how she tasted. Twilight lowered her hoof until it reached the bottom of Cadance's outer lips, making the pink mare shiver in arousal. The purple alicorn gave a slow, upward stroke until she reached the clitoris, then pulled away. She then brought her hoof up to her muzzle and gave it a lick. It was a slightly bitter taste, but other than that, it wasn't half bad.

Twilight licked the rest of Cadance's essence off her hoof before returning her focus to the task at hoof. She lowered her backside until the tip of her new stallionhood was aligned with Cadance's vagina. After looking up and getting one last go-ahead nod from her sister-in-law, Twilight pressed forward, sinking the tip of her cock into Cadance. Both mares moaned at the feeling, Twilight being the louder one as this was her first time experiencing such a sensation. Only minutes earlier had she clamped down on something inside of her, but never in her life had she had something clamp down on part of her own body like this. Nowhere in her lust-addled brain could she find the words to describe how she felt at that moment.

The young alicorn continued, pushing the rest of her cock into Cadance until she was fully hilted inside her sister-in-law. The feeling was so intense that Twilight's hind legs gave out almost instantly, and she collapsed onto Cadance's stomach, the pink mare's penis pressing into both their chests. More pleasure shot through Cadance as she felt a new pressure on her stallionhood, and she and Twilight both relished in its warmth. Eventually, Twilight pulled herself out slightly, then pushed back in, repeating the process a few times. Each small thrust brought tiny moans and whimpers to both of them, their wings flaring as pleasure rocked their bodies.

Twilight soon regained strength in her hind legs, getting up and pistoning her cock into Cadance faster and faster. At the same time, she couldn't help but notice Cadance's cock slapping against her belly with each thrust. She had already sucked her off and enjoyed it, so why not do it again?

"HHHH!!!..." Cadance gasped as she felt Twilight's mouth envelop the head of her stallionhood once again. Twilight soon got into a rhythm of suckling the head of Cadance's penis every time she thrust into her, and that only added to the already blissful state the pink mare was in. As Twilight gave a particularly rough lick to her flaring head, Cadance shouted, "Ahhh!! Twilight! I...I...AHHHHHH!!!!!!"

Everything seemed to hit Twilight all at once. She could feel Cadance's cock releasing its warm, delicious seed into her mouth, all while her own stallionhood was being squeezed by her sister-in-law's climaxing vagina, becoming completely drenched in her marecum. At that moment, the pressure inside Twilight's cock reached its limit, and she moaned loudly around Cadance's head as she came, blasting her fresh seed deep into Cadance's womb. Cadance screamed again as she felt Twilight filling her up with her fluids, slowly relaxing as she basked in its warmth and came down from her orgasmic high at the same time.

After several moments, Cadance, still heavily panting, asked, "hhhh...So, Twilight...hhhh...how did it feel?"

"I...hhhh...can't explain it...hhhh...It was too amazing..." Twilight replied, quietly.

"hhhh...Shining Armor never gives me this much pleasure..."

Twilight no longer cared that she had just had sex with her sister-in-law. "Then...hhhh...maybe I should drop by the Crystal Empire more often..."

"Hmmm..." Cadance finished, the excessive warmth relaxing her, "Maybe..." At that moment, the pink alicorn closed her eyes and fell asleep. Smiling, Twilight pulled her still erect cock from Cadance's depths, a mixture of their fluids pouring out of her. She kissed Cadance on the cheek before turning to face the other two princesses.

"Well done, Twilight," Celestia said.

"Thanks," the purple mare replied before looking over at Luna, "Luna, would you like to go next?"

"It is entirely your choice, Twilight," the night princess replied, "But I would be happy to be your next conquest." Twilight was a bit taken aback by the use of that terminology, but at this point, she didn't care in the slightest. She so badly wanted to feel her penis plunge into another mare's vagina.

Luna lay on her stomach at the edge of the mattress, far from where Cadance was napping. Her hind legs were on the ground, and her tail was raised. Twilight noticed this and asked, "You...you want me to mount you?"

Luna smiled and replied, "Again, it is completely your choice, Princess, but I feel that it would be better if we...mix things up a bit," she finished with another coy smile.

Smiling eagerly, Twilight went over to Luna and mounted her, the tip of her penis quickly finding its destination. She pushed herself in slowly, eliciting an, "Ahhh!!!..." from the alicorn below her. Twilight herself moaned, too, and soon, she was balls deep inside the Princess of the Night.

Twilight wasn't normally one to rush things, but she was eager to feel these sensations again as soon as she could, so she immediately began thrusting in and out of Luna's soaking marehood. The sound of their flesh meeting with every hilt drove Twilight into further arousal, causing her to speed up.

It was quickly becoming too much for Luna. The feeling of being filled and stretched, combined with multiple jolts of electricity from Twilight's ball sack slapping against her swollen clitoris, drove her over the edge faster than Twilight had expected. Her marehood spasmed, then clamped down tightly on Twilight's cock, holding it in place as warm liquids began pouring out of her at a fast rate. Also, under her, the force of her orgasm made her enormous stallionhood twitch vigorously, covering the edge of the mattress in a layer of white, hot cream.

Meanwhile, the force of Luna's climax sent Twilight into orgasm faster than she had wanted, but the purple alicorn wasn't complaining as her cock throbbed, spewing what felt like gallons of cum into Luna's pussy, filling her womb in an instant and spilling out of her a short time later.

Finally, both mares came down from their respective highs as Twilight lay her head between the base of Luna's wings, while Luna herself rested the side of her head on the soft mattress.

Before Twilight could say anything, she felt a gentle hoof on her shoulder. She turned her head to find Princess Celestia standing over her. "Wonderful," she said in a soothing voice, "You're almost done, Princess."

Twilight only moaned in contentment as she slowly stood up, pulling her penis out of Luna and watching as more of her semen flooded out of the now sleeping night princess. She turned her head to Celestia, only to find her carefully lifting Cadance in her magic and placing her next to the other sleeping alicorn, leaving a nice, wide-open spot on the mattress. "Come, Twilight. Over here," Celestia whispered, beckoning her former student with a hoof. As Twilight approached, Celestia laid on her back and spread her legs, much like Cadance had done earlier. Her white member was still as big as it was before, and Twilight realized that if she was going to pleasure Celestia, she would have a hard time fitting the head into her mouth.

This didn't phase the determined purple alicorn one bit, so she climbed atop her former mentor, her head only getting as far as her stomach as she felt the tip of her member poke Celestia's back door. This caused Twilight to jerk back quickly. "Sorry, sorry!" she said in a whisper.

Celestia chuckled. "Don't worry, we can get to that another time. Right now, you must fill me to the brim," she finished in a husky tone. Twilight shivered upon hearing Celestia say that. Never had she heard the grand ruler of Equestria say something so lewd. Nevertheless, this was something she needed to do, and she desperately wanted to do it. HARD.

Twilight aligned herself with Celestia's soaking slit, not wasting any time in pushing herself inside. Twilight moaned loudly as she felt her member become enveloped by another beautiful, amazing set of pussy lips, while Celestia simply gave a soft, "Mmmm..." as she and her former student began their union.

Once Twilight was all the way inside, she rested her head on Celestia's soft, furry chest for a few moments, wanting nothing but warmth and raw pleasure to take over her body. Celestia's fully erect stallionhood was sandwiched between her and its owner, only adding to the blissful heat that Twilight was partaking in. The smaller alicorn felt Celestia's forelegs wrap around her, the embrace letting her know that the Princess of the Sun was enjoying this as much as she was. Soon, Twilight began slowly pumping, hearing the sound of her liquid-covered cock exit her former teacher before she pushed herself back in. Celestia continued to moan softly and quietly as she felt herself getting filled again and again, all while two different coats of soft fur rubbed against her massive member.

Celestia soon put her outstretched wings to use, flexing one of them to gently stroke Twilight's horn, while the other one rubbed Twilight's new, feathery appendages. Twilight gasped in both shock and pleasure as she felt the new sensations coursing through her body, sending waves of pleasure through each and every one of her muscles. She let loose a loud, "Ahhhh!!!!..." as she experienced three pleasurable feelings all at once, the majority coming from the alicorn she was about to fill.

Celestia continued to elicit silent moans and gasps as she continued her ministrations on her former prodigy. "Ah..." she began, her instincts telling her that Twilight was close to orgasm once again, "That's it, Twilight...ah...you're doing great...ah...Let it all out...ah...cum for me..." In order to make sure the young alicorn did so, Celestia increased the pressure her wings were putting on Twilight's own wings and horn, causing Celestia herself to experience a heightened sense of pleasure, as alicorns were very wing sensitive, just like pegasi.

The multiple feelings in Twilight's body were too intense, and with a loud, primal scream, she reached her final climax of the night, shooting her hot seed inside Celestia, all while her own marecum cascaded down her hind legs, soaking the mattress under her. The sudden warmth from Twilight's load, combined with the electricity coming from her wings' ministrations, caused Celestia to orgasm as well, albeit less intensely, as her pussy leaked a generous amount of cum over Twilight's dick and balls, while her own stallionhood shot several spurts of cum onto her chest and Twilight's chin.

In the end, both mares panted heavily as they basked in their afterglow. Remaining in the embrace, Twilight opened her eyes to see several ropes of semen on Celestia's upper chest, so she scooped it all up in her magic and brought it to her mouth, moaning in delight as the sweet, caramel-vanilla flavor washed over her tastebuds. She then used a hoof to clean the cum off her chin, which she put in her mouth, as well.

After swallowing the white mare's load, Twilight pulled out of Celestia and crawled up on her chest, relaxing further into the embrace. She sighed and asked, "D-Did I do alright?"

"You sure did," Celestia replied, stroking Twilight's back, "You shall now be officially recognized as a princess from now on."

Twilight only hummed in delight, happy that this was over with while she basked in her former mentor's warmth. At the same time, she looked over and saw that Luna had begun spooning with Cadance, both mares still fast asleep. Twilight then rested her head back on Celestia's upper chest and quietly said, "I love you, Princess Celestia. I love all three of you."

Celestia smiled and replied, "We love you, too, Princess Twilight." She then leaned down and gave the younger alicorn a kiss on the forehead before laying her head back, both her and Twilight relaxing further until they joined Luna and Cadance in a deep, much-needed slumber.

THE END

Bonus Chapter: While the Others Are Sleeping...

Twilight slowly opened her eyes to a newly familiar sight. She was still lying on Princess Celestia's chest, the white alicorn's forelegs still wrapped around her. Twilight looked around, seeing that Celestia, along with Luna and Cadance, were still fast asleep. The room they were in was still decently lit, albeit not as bright as it was during their earlier activities.

Speaking of those activities, Twilight's brain was still trying to comprehend the monumental sense of pleasure that her new stallionhood had provided, combined with the feelings of having all her holes penetrated. It was nothing like she had ever felt before. Being filled to the brim, growing a new appendage, and then putting it to good use all in one night. It would be one experience she wouldn't have to write any letters about.

Not knowing what time it was, Twilight yawned audibly as she lay the side of her head back down on her former mentor. However, the movement and sound caused Celestia to stir slightly, and then she opened her eyes. Twilight was a bit taken aback as she looked the sun princess in the eyes, but she loved it, considering how she was able to express her utmost appreciation and affection for her through their earlier union. "Hi..." Twilight whispered to Celestia.

"Hello, Twilight," the white alicorn whispered in response, rubbing her former student's back comfortingly, "How are you feeling right now?"

"Just...absolutely wonderful. I mean, it would have been nice if I had known about this in advance, but I don't care at this point. I've never felt this amazing in my life. Thank you."

Celestia gave the purple alicorn a warm, loving smile. "You're welcome," she replied.

"No, not just for this, but for everything. I know I may have already thanked you at my coronation, but now that we're face to face and secluded from everypony else - well, except those two," Twilight said while gesturing to the to sleeping alicorns on the mattress who were still in a spooning position, "Now I can really express my gratitude. So...thank you, Princess Celestia. Thank you for being my teacher, my mentor, my leader, my key to success here in Equestria, everything. Thank you."

Celestia leaned forward and kissed Twilight on her forehead. "You're welcome, Princess Twilight," she replied in her most soothing tone. After that, Twilight began to lay her head back down, but Celestia quickly stopped her. "Twilight," she continued.

"Huh?" Twilight replied.

"Before you go back to sleep, I was wondering..."

"What?"

"Well, remember when you almost accidentally penetrated me in the other hole down there?"

Twilight's eyes widened upon hearing Celestia bring that up. She continued in a whisper, "Oh, yeah. I'm really sorry I did that. I hope I didn't anger you or make you feel uncomfortable."

"Don't be sorry, my dear. I did, after all, say we would get to that later. And now, since we're both awake, I suppose we could...if you're up for it..." Celestia finished, giving Twilight a devilish grin.

Twilight immediately knew what the elder alicorn was getting at. Though it had never even crossed her mind to for anypony to have sex in anywhere but a mare's vagina, her curiosity was getting the better of her, just like it had done many times before. However, there was one other factor they had to consider. "In front of them?" she asked in a whisper, pointing to the two sleeping alicorns for a second time.

Celestia nodded. "Trust me, I don't think we'll make that much noise," she replied.

"I sure hope not..." Twilight thought to herself.

At that moment, the young alicorn felt one of her former teacher's hooves leave her back and head for her hind quarters. She had a feeling that she was going to give her rump some affection, but instead, it went past her rear, and she couldn't exactly feel where it was going. Eventually, she heard a small gasp coming from Celestia, and she turned her head around to see what was happening. Her eyes widened again as she realized that Celestia had started to rub her own pussy, and she soon heard a slight squelching noise as it became clear that Celestia had become wet. Was it because of the prospect of Twilight giving her anal? The purple mare would never know.

All of a sudden, Twilight felt herself being surrounded by Celestia's magic as she was lifted up and positioned at her personal area. She took one look at the white alicorn's soaked marehood, and it was enough to make her new cock come out of its sheath and slowly harden. Once it was fully erect, Celestia used her magic to guide her former student's member into her waiting pussy, and then the two of them were connected once again. Twilight was unsure why Celestia was doing this, but it didn't matter in the slightest, considering that her cock was inside her former mentor once again, throbbing as it sent massive waves of pleasure throughout her body as she moaned.

Celestia then pulled Twilight out of her and placed her back on the ground, standing her former prodigy on all fours as she rolled herself over onto her stomach. She got into a position that was identical to Luna's earlier one, when Twilight had taken her from behind. Once she lifted her tail and exposed her most forbidden area, Twilight knew exactly why she had had her plunge her member into her pussy. She was going to be the one taking Celestia in the ass, not the other way around.

For some reason, Twilight didn't find herself the slightest bit nervous as she reared up on Celestia. She took one more look at her target, seeing that it was fairly puckered and didn't seem to be capable of taking much. That theory, however, would soon be put to shame. With her former teacher's fluids coating her erection, Twilight mounted Celestia and used her magic to bring her cock into position. She poked her pink head at Celestia's back door, making the white alicorn gasp and shiver at the sensation.

Twilight then pushed forward, the tip of her stallionhood slowly penetrating Celestia's anus until it popped inside. "Ah!..." both alicorns gasped, silently. Never before had either of them felt a sensation like this. Celestia had never had the time in the past to experiment with her rear entrance, and it was something she desperately wanted to try out, and now, Twilight was fulfilling that desire.

Twilight gently eased herself further into Celestia's plothole, stopping periodically to allow the white mare to adjust to the intruder in her behind. "Mmmm..." Celestia moaned into one of her forehooves as she bit down on it. Twilight herself was also moaning quite audibly, but she was keeping her mouth closed the entire time. Inch by agonizing inch, Twilight pushed her cock further into Celestia's rear until finally, her balls made contact with the white alicorn's outer lips.

Feeling her former student's member completely inside her ass, Celestia gave another muffled moan as Twilight herself groaned into the fur on Celestia's back at the sensation. This was nothing compared to having normal intercourse with her former teacher. Celestia's anus was so tight that she worried she may not be able to pull herself out. Nevertheless, that was the last thing on her mind as more pleasure racked her body as Celestia clenched around her penis a few times. As for Celestia herself, her own stallionhood was now fully erect, sandwiched between her belly and the edge of the mattress. It was a rather uneven sensation, but having it rub against anything at this point was all she wanted as her former student began to back up.

Twilight slowly pulled back, Celestia's puckered hole denying it exit a few times before only the head remained inside, and then she eased herself back in, albeit faster this time. After repeating this process a few times, Twilight built up a rhythm to where she was pulling in and out at the rate of one thrust per second. With each pump, Twilight's reasonably sized scrotum slapped against Celestia's vaginal lips, giving the elder alicorn even more pleasure than she had anticipated. "Ahhh...Twilight..." Celestia said in-between thrusts as she turned her head and brought a forehoof to Twilight's right cheek, "Don't...stop...Ahhh...You're...doing...great...Ahhh!"

"You...Ahhh...feel...Ahhh...amazing!" Twilight replied, panting as she continued giving the almighty ruler of Equestria anal.

She then noticed that Celestia was flexing her already-erect wings in the same way she did earlier, most likely heading for her own wings and horn. She then stopped thrusting, causing Celestia to look back at her again with a puzzled look, her wings freezing in place. "Let me handle this," Twilight whispered, her voice laden with love and lust as she looked Celestia in the eyes.

Celestia nodded and turned her head away again, and with that, Twilight resumed her thrusting. The white alicorn then gasped again as she felt a new sensation in her loins. She looked back once more to see Twilight's horn illuminated, and she realized that her former student was using her magic to fondle her clitoris, which made the pressure inside her quickly rise.

"Twilight...Ahhh!" Celestia exclaimed, louder this time, "I'm going to...I'm going to...!"

"So am I...Ooohhh!" Twilight moaned as she felt her stallionhood begin to pulse violently. Her magic had started to falter upon having the pressure rise, but at this point, whatever pleasure she could give was enough for Celestia. Neither mare cared that their cries of pleasure were louder than they had wanted. They were too far lost in the land of untold euphoria.

Within the next several seconds, both alicorns reached the summit, and their orgasms crashed over them like a tidal wave. Twilight's magical ministrations on her love button caused Celestia to clench her former prodigy's member tightly as cum flooded out of her empty marehood, staining the edge of the mattress and the floor below. At the same time, the increased pressure caused Twilight's cock to fire multiple jets of cum into Celestia's plothole in rapid succession. The white alicorn moaned in primal bliss as her deepest, most forbidden regions were flooded with warm, creamy love juice, and Twilight did the same as her pulsating cock remained trapped inside Celestia, whose own stallionhood fired multiple strands of cum onto her white-furred chest and the mattress.

Finally, both mares slumped down, Celestia's muscles relaxing and allowing Twilight to slowly pull out of her. She met some resistance along the way, but she was soon free of the white mare's backside and lazily fell to her side, her upper body laying on the mattress as she panted heavily.

Amidst the sexual haze, Celestia noticed Twilight's current position and used her magic to pull her fully onto the mattress. She then pulled herself onto it as well, and then she wrapped a wing around the purple alicorn as she laid her head down and basked in the sensual afterglow. Continuing to pant, the Princess of the Sun said, "hhhh...Thank you, Twilight..." She got no response, so she looked down, only to notice that the immense pleasure had already sent Twilight back to sleep, her member tucked away in its sheath once again. Celestia smiled, leaned down, and kissed Twilight on the forehead before laying her own head back down and closing her eyes, joining her former student in sleep once again.

"They seemed to have quite the time..." Cadance whispered to Luna, both hers and the other alicorn's eyes open ever so slightly as they glanced over at Twilight and Celestia.

"That they did, Cadance," Luna whispered back, her forehooves still wrapped around the pink alicorn as they continued spooning, "That they did..."

THE END (for sure...)