Twilight's Boost of Confidence

by Steel Quill

Rating: mature
Tags: Slice of Life, My Little Pony: Friendship is Magic, Original Character, Porn, Rainbow Dash, Sex, Twilight Sparkle, Anthro
Length: 11161

Twilight unlocks the secret to Alicorn beauty. Her newfound confidence doesn't go unnoticed at Ponyville Gym.

Everypony has that dream figure they want to work for and to have, to feel confident in their own skin and appreciate feeling good about themselves. Twilight's no exception to this rule, and has been endeavoring to improve herself as she becomes used to being an Alicorn. Except...her figure isn't quite catching up with her. She's still the same thin, bookworm mare she's been since she left Canterlot. What can she do to fix this?

A breakthrough in Alicorn biology, magical energy conversion, and a hell of a lot of Hayburgers ends up being the key. Watch out, Ponyville: Princess Twilight is on the prowl!

A for fun story I came up with to accompany a set of pictures of anthro Twilight done by the talented and entertaining Maarthul. The cover art is what first inspired the story, along with his other images of Twilight. Give him a google on his tumblr, for more of the same!

Tags/Kinks: Alicorn Magic Shenanigans, breast/ass enhancement, vanilla sex, oral, vaginal, sweat, excessive cum, titfuck, creampie, and a dash of voyeurism at the end

Edit: Featured 3-17-18! Thank you!

Published 2018-03-17 10:50:07 UTC
Last updated 2018-03-17 10:50:07 UTC

Experiment Equals Ecstasy

In the chaotic and eventful existence of ponies in Equestria, there were a few constants that remained in place to offer some semblance of balance or normalcy. The sun and moon rose and fell by the whims of Celestia and Luna respectively; magic was ever present and available to those who sought it out; cider was the craze and want of everypony in Ponyville ever Fall season. Normal things. Amidst those many facets of normalcy, for Ponyville, there was also one certainty many a pony could rely on in times of need.

Twilight Sparkle was a brainiac.

Top of the class, Celestia’s personal student, the Princess of Friendship; Twilight had acquired many a recognition and title in respect to her intellect that carried on through the present day. It was a source of pride and of continuous enjoyment for her, to forever be pursuing knowledge and understanding in all fields of life, be it academic, economic, magical, cultural, or any others of the vast fields of information she’d come to bring into her mind. When a trial was presented to her, she tackled it with gusto, certain in her ability to, in one way or another, find the answer to the question posed to her.

“I DON’T UNDERSTAND THIS!”

However, the latest issue was proving to be a conundrum of personal problems that perplexed the purple princess pony.

Standing in her personal bathroom adjacent to her sleeping quarters, Twilight Sparkle was in the midst of scrutinizing her figure. It was a matter that had been one of the few thorns to stick in her side for some time now in her adult phase of life, beyond adjusting for her new wings from her ascension and the duties of being a Princess instead of just the local librarian. But unlike politics or workplace issues, the one provoking Twilight’s ire was a personal matter she’d been trying to improve upon for some time.

Namely: her figure, or the lack thereof of said figure.

Twilight was wholly aware that she did not look horrible or disfigured or obscene, far from it. She had a healthy ratio measurement of her breasts, hips, legs, and rear that was proper for a mare her height. Even with the few growth spurts she had been through of recent times, what with her Ascension and all, her figure had yet to truly expand further than what she’d been before the transformation. At first, she took it as simply an issue of being a “late bloomer” as it was, which was a common thing to happen to ponies of magical heritage like herself.

But enough time has passed that the worries that hovered at the edge of her mind began to gnaw at her subconscious: she never seemed to gain anything, despite her attempts to make things happen. And it was why the mare was scrutinizing herself in her mirror, bare of any clothing save her simple white bra and panties as she examined her reflection, hoping to find any sign of anything to explain the conundrum.

“It’s not like I’m not eating or exercising.” She told herself, exasperated. “Three square meals a day, exercising on a rotational off day to allow the body time to adjust and recover between efforts. But I’m not eating so little to not acquire more weight, or exercising enough to counteract any of my intake!” Bringing a hand up, she let her fingers run along her cheek before brushing up and through her mane, the darkened blue and pinkish streaks shifting from her motion. The hip length hair was at least one positive body aspect she bore no qualms with, grateful for Rarity’s tips on mane management to bring out the best of it.

Thinking on the fashionista, even though it was a positive thought, reminded Twilight that the Element of Generosity had hardly any issue with body image: she was a picture of grace and beauty that she had grown into and basked in constantly. The term “hourglass figure” came to mind concerning Rarity, which was the most apt to describe her. For all the trouble her efforts sometimes made to keep up her appearance, the work showed itself in her ability to draw in any man's wandering eyes to her figure. It often made Twilight feel a touch jealous, if she was honest, that Rarity was simply that radiant of a mare.

“Granted, I don’t need a spa day almost every single day to keep up my appearance.” She remarked, folding her arms over her diminutive chest. “But still...I wouldn’t mind at least going up a size or two.” Twilight added as she glanced down at her covered breasts. “I don’t look anymore Princess-y than I did last year. Still feels like the same old ‘bookworm’ look that Dash says I have.”

It had been the athletic mare’s suggestion to throw more of a workout into the mix in trying to boost Twilight’s figure. Her reasoning had been fair at a first impression: if she isn’t going to be becoming bigger in any departments from natural growth, then she could at least fine tune her current appearance and improve what aspects she had presently. The pegasus showed herself to be quite the catch herself, in the right light: her athletic frame, lean and lined with muscle, allowed Rainbow Dash to be an attractive mare if without the burdens or labor that would come with a larger figure than what she had. Applejack was similar in terms of that aspect, even though her looks came from the hard labor she put in for her farm.

And yet...it was as if Twilight’s growth was on a permanent pause button. She could run through every exercise machine and routine they had available for her, and her strength was clear as her alicorn form was equipped to handle such heavier strains. But instead of gaining muscle tone or firming up her rear, Twilight’s appearance didn’t shift even in the slightest. If anything, it made the display of physical ability only more confusing, coming from a mare who looked more at home on the sidelines than in the middle of the action.

“There must be something I need to do differently. Some aspect I’m overlooking, some factor that I’m not applying correctly.” Twilight began to pace back and forth in the middle of her bathroom, her bare feet tapping on the smooth floor as she worked it out. She often viewed issues like these as she would any sort of complicated mathematical problem or equation. The elements of what she had were in front of her, and she knew the end result she wanted. It was a matter of using what was at her disposal to get what she desired.

“Come on, you’re an Alicorn, a Princess, an Element for Celestia’s sake! If I could solve Starswirl’s lost magic, I can surely figure out a way to not be a matchstick of a mare!” The pacing alicorn declared to herself. It was good that the rest of the castle was empty so nopony was around to witness her frustrations. The last thing she wanted was to have Starlight or Spike making snark jokes behind her back about the “Alicorn of Obsession” or some such ridiculousness.

Twilight’s pacing slowed as she hovered on that thought, and turned back to look at the mirror again. Every solution she’d attempted thus far for her body dilemma served only to fail, but was the answer right in front of her? Each method, each process was one geared towards the biology and studied understanding of regular pony physiology. While Twilight was once a normal unicorn pony (if one can call a life like her’s normal), she no longer adhered to such a standard. She was elevated to Alicorn status, and that meant that perhaps, the old rules and ideas no longer applied. She needed to apply the thinking that would work for mares like her old mentor, or her sister, or even her sister-in-law Cadance. Each of them were breathtaking mares in their own rights; so what did they do that she wasn’t?

“Celestia and Luna have been around for thousands of years, and Cadance got the genetic jackpot to explain her looks. So...how does a pony turned alicorn go from this,” she tapped her belly gently with her palm, “to them? It could be that while I don’t feel a change in my metabolism, the meals I’m eating are not truly enough to fuel the change in my figure, and as a result, I’m stagnated in terms of growth, by Alicorn standards. If that was the case, then eating more to fuel my body’s growth would be an idea.”

Twilight lowered her hand and sighed. “But that means sticking to strictly specific foods, and dropping other non-helpful food types. It's not like I’ll be able to stuff my face with hayburgers and get a model’s figure from them.” She told herself. Her eyes widened as the question suddenly rang clear through her mind.

Why not?

Two weeks had passed since Twilight’s pondering on the subject matter of Alicorn metabolism and its effects on one’s physical body. Twilight’s friends had each been notified she’d be unavailable for that time period for the sake of her experiment, unless an emergency event happened, so they’d know where she was. By the end of the first week, there was a touch of concern over just what it was Twilight was doing. By the second, it was decided that Rainbow Dash would be the one to take the lead and bring the sheltered bookworm out of her self-imposed shutaway and get her out again.

For Dash, it was hardly an effort to go and get the egghead alicorn from the castle. She knew where she’d be: probably hunched over a messy table littered with papers and beakers and Celestia knows what else, muttering numbers and magical theory under her breath. All Dash knew about the experiment was that Twilight was testing a theory about Alicorns and requested privacy to see if her theory held water or not. So, since time was up, it was no doubt long overdue for the lavender maned alicorn to get out, freshen up, and join her for a round at the gym or two. Working out without her go-to partner for exercise had made the routine a little dull lately, so having the egghead present would make it fun again.

“Twilight? You in there?” Dash called through the closed doors of Twilight’s room, pounding a fist against it to better get the princess’ attention. “Come on! It’s been two weeks, you said that’s all you needed!”

“Oh, Dash! Hey!” Twilight’s voice answered. “Oh, is it eleven already?”

“Yep. You said you’d be coming with me to the gym today. We can’t let you get all flabby just because you found some egghead science thing exciting,” the athlete insisted, “you need fresh air! Food! Atmosphere!”

“I’ve had food! I had it delivered!” She called back. Dash could hear her rummaging about the room, no doubt trying to clean up before she would come in and make fun of the potentially sloppy living quarters.

“Eating from Hay Burger for so long isn’t healthy, Twi! I’m gonna be running you through so many situps and squats to burn off all that burger fat!” Rainbow exclaimed. “Now come on! You can clean your room later! Or make Spike do it, even.”

“Alright, alright! I just had to find some clothes!” Twilight insisted, making Rainbow snort and turn away from the door, bringing her hands up behind her head as she awaited her friend’s emergence. Not that she’d admit it outright, but making sure Twilight got out and stayed healthy mattered to the Wonderbolt in training. If anything, physical health was one of the few passions she was known for, and when it came to her friends, she always checked on making sure they were keeping themselves in good shape. Except for Pinkie Pie: that girl did her own thing that defied any ideas Dash could put to test against the hyperactive mare.

Twilight’s door opening interrupted Rainbow’s thoughts, and got her attention. “Ok, I’m ready!” Twilight’s voice exclaimed, the pep in it making Rainbow smile as she turned around.

“Ok, let’s get...going?” Dash’s eyes blinked in confusion. This mare wasn’t Twilight; she wasn’t an egghead at all! She was some kind of supermodel with Twilight’s voice, or an adult film star! “What the buck? Twilight?”

“Surprise!” The voice was definitely Twilight’s, but the body standing in front of Dash was radically different from the Twilight that Rainbow had come to know for the past few years. Where once stood an egghead, bookish mare was now a feminine, full-figured woman who looked cut straight out of Playpony. She had on a simple pair of slack gym pants that once needed to be tied tight to keep to the mare’s wiry legs. Now they needed no assistance, melding to the powerful, long legs and toned thighs she stood on like a second skin. The way they hugged her rounded hips made Rainbow briefly wonder how the heck she made them still fit.

The logic defying changes continued as Rainbow’s vision crept up along the fit, toned belly that was bare of any clothing thanks to Twilight’s lack of a top. In fact, Twilight’s whole upper torso was bare save for the workout bra she had on, which was straining to contain the massive jugs that she had for a chest now. They looked to be the genuine article, their weight giving the globes a slight droop even with the aid of the bra, but making it no less appealing to see. If anything, it was like she’d gone and exploded through five cup sizes straight to porn model size!

“...alright what the buck is this? Where’s Twilight? What kind of prank is this, cuz I’m lost.” Rainbow challenged.

The busty alicorn before Rainbow giggled into her palm before answering. “It’s me, Rainbow. This,” she gestured at her new figure, “is the results of my experiments in unlocking the hidden metabolic potential of the Alicorn female body! What do you think? Impressive, huh?” Twilight did a brief turnabout on her feet, treating Dash to a momentary glimpse of just how tightly the gym pants fit against her now round and thick butt. She’d gained more than mere inches in terms of size, from the way the cheeks gave a wiggle by the time she came to a stop and settled. “I finally solved just why it is that I haven’t been improving.”

“O...ok, I’ll bite. What did you do?” Rainbow questioned. “I mean, Twilight, you’ve gone from egghead librarian to knockout in two weeks!”

“I know, right?” Twilight answered back before continuing. “As it turns out, the Alicorn body has a much more different dynamic in its metabolic conversions of food and energy than the normal pony does. Which makes sense because, duh, Alicorn.” She gestured with a hand at herself as she spoke. “For all my efforts, everything I did was designed to help the common everyday pony. And I used to be that, but biologically speaking, I’m not anymore. So, I had to try a different approach.”

“If this is all magical enhancement, I’m calling shenanigans on you. You’re not a girl to go for the fake-appearance route, Twilight.” Rainbow said. “I thought you were better than that.”

“No, no! None of this is fake! Here, see!” Before Dash could react, Twilight grabbed for her free hand and brought it to her bosom, letting the mare’s fingers sink into the soft flesh beneath her thin top. “It’s all real, 100% genuine article. No magic enhancement or illusion work!”

Dash was mystified at the moment more with the soft mound in her hand than Twilight’s words, needing a second or two of a brief squeeze of the breast in her grasp before jerking her hand back and lowering it to her side. Dash was a mare who handled clouds for a living, and they were considered the softest of things in existence. And yet, Twilight’s breast was just as soft if not better!

“R-right. Wow. Ok.” Dash replied, cheeks red from the intimate contact. Twilight tended to forget common social barriers and lines when she got excited with her experiments. “So...you found the secret in Hay Burger?”

“Not quite, no. What I did was apply magical theory of energy conversion, but towards my figure’s development instead of simple digestion and redistribution of energy.” The now busty egghead told her. “It’s really complicated to explain it all out, but in the simplest of terms; because of my alicorn biology, and my talent for magic,” Twilight’s horn gave a brief glow atop her head, “I found a way to get past the block my body was experiencing and grow into my proper figure.”

“...not gonna lie. I’m jealous.” Rainbow admitted flatly, shaking her head. “Only you could turn something as fat gaining as Hayburgers into the secret for a figure like that.”

“I can’t wait to show the others! And go to the gym, of course. We have a schedule to keep to after all!” Twilight declared. “Come on, let’s go!” Taking Rainbow by the hand, the athlete was pulled by Twilight to make for the exit, the bookworm clearly excited to get out of the castle and show off the results of her newfound figure.

‘She’s going to break every guy’s mind at the gym. And their pants. She was so soft…’ Rainbow thought to herself before pulling her mind back to the present, walking alongside the now-busty alicorn as they made for Ponyville’s gym. Rainbow wasn’t sure if Twilight was aware of just how dramatic her changes were on her body, but if the way every male stopped and stared at her as she walked was any indicator, Twilight’s little experiment had definitely paid off.

Fifteen Minutes Later

Ponyville Gym was one of the main fixtures of fitness for the country town’s residents, a place where every health pursuing pony went to at one point or another. Big or small, wiry or buff, regretfully or energetically, it was an often crowded place with plenty of foot traffic. All comers were welcome to the fitness center, as it catered to clients of all shapes and sizes. Rainbow Dash herself was one of the constant figures present, being a mare constantly training and improving her physical ability in pursuit of her goal of being a Wonderbolt. As a result, she’s seen her fair share of odd or funny moments in the gym while working out, like the time Thunderlane tried to show off for Cloudkicker only to pull a muscle and almost drop his barbells, or the time the cutie mark crusaders ran a treadmill too fast in their pursuit of an exercise related cutie mark.

Today, however, was an abnormal day by far, with the source of the abnormality coming from her close friend, Twilight Sparkle.

When she and Twilight would usually come to the gym to work out, it was an accepted regularity that Dash would get more wandering stares or glances from passing ponies than her bookish counterpart. To the pegasus, it was a point of pride to garner attention that way, putting in an extra grunt or show of effort before watching knowingly as a stallion turned his gaze away, bashful as he focused back on his own reps instead of her flexed arms or outstretched rear if she were doing squats. Twilight, being her much more sheltered and less showy self, drew little attention more than the occasional friendly “hello” or nod from passersby ponies.

The new Twilight, however, was a whole different ball game altogether.

It took only a few minutes after the two had settled into their usual routines, Rainbow going for the weight bars while Twilight stood by the dumbbells, for attentions to shift. Only this time it wasn’t directed at the multi-colored pegasus, but instead, at Princess Twilight. Since she was still in the same attire she’d worn when Rainbow came to get her, she was already showing a lot more skin than she typically would. But more than that, the sheer energy that seemed to exude from her as she worked garnered many a wandering pair of eyes. Rainbow had to stop counting after the sixth stallion paused mid workout to oogle the lavender pony’s figure as she worked her dumbbells up and down, the repeated motions adding a slight jiggle to her impressive bosom with each pass.

There was something else too that Rainbow could feel, emanating from Twilight. It was like she’d found her confidence, her spirit, and it was like looking at a warm fire blazing through a cold winter’s night. She was smiling as she worked out, getting enjoyment from the feeling of her new body and the reception she was getting thus far. Before, she was always so serious, so focused on precise counts and muscle movements that she could be a bit of a buzzkill when it was just something for one’s healthy benefit. But this new Twilight relished the work more, and it was something Rainbow could admit worked to her benefit.

“Yo, Twi. Doing alright there?” Dash asked when she came back over to the alicorn. Dash’s question got Twilight’s attention, making her turn to face the pegasus and smiling at her.

“Rainbow, I feel so great now!” She declared as she held both dumbbells up with ease before lowering them to her sides. The smile on her lips was genuine, further exuding the confidence Rainbow had felt coming from her as she worked out. “It must be a result of the spell’s magic, but I feel so much stronger, and better!”

“I’ll say. You’ve been racking up an audience count, too.” The pegasus pointed a thumb over her shoulder, making Twilight look past her at the expanse of the gym. As one, several stallions blinked back at her before they all suddenly busied themselves with their weights and routines, making the alicorn smile. It was a smile that made Rainbow raise an eyebrow, from how self-assured it looked. “...don’t tell me you were hoping for that?”

“Well...maybe a little?” The admission made Rainbow’s other eyebrow follow its partner while Twilight continued, setting her weights down on the nearby bench before continuing. “It’s hard to explain, but...Dash, you and the girls all shine so well. You really do. And I’m not jealous of that, don’t get me wrong, I’m more than happy for you! Just that...well, I’m miss bookworm. Or ‘egghead’ as you call it.”

“You got that right, egghead.”

“But for once, instead of feeling like I’m lacking in comparison, I’m genuinely getting attention. I’m noticed in a way that makes me feel more...here, if that makes sense. I’m not just the smart princess. I actually look like one now. I’m more in line with how Cadance and Luna and Celestia look, instead of just a mare who so happened to get wings and a unicorn horn.” She explained. “I mean, I’m not gonna be doing photo ops or stuff like that, but its just...you always notice how when we’re out together, its Rarity who always gets attention first?”

“I think I do. She always plays up the charm when there’s a guy around that catches her fancy. Bats her eyelashes, does her little pout, works her stuff.” Rainbow summarized. “That’s Rarity for you.”

“Yes, and I’m more than fine with her doing that, because that's part of who she is. She’s a natural for it. Fluttershy too, and you, Pinkie, AJ, all of you. And me, I just wanted to kinda get my own little spotlight too. And now I feel like I can.” Twilight turned away from the weights to address Rainbow, who had adopted a thoughtful stare at the alicorn. “Does that sound...weird?”

“Weird? Nah. Weird is Discord when he’s drunk and trying to morph us into different species he thinks are cool.” Rainbow assured her, coming up to pat the lavender mare on her shoulder. “I’m happy to see you being more outgoing, Twilight. It’s better for you than being cooped up in your labs all the time, or head buried in books.”

“This is coming from the mare with the stack of Daring Do books by her bedside every night?”

Rainbow paused for a second before giving a scoff and folding her arms over her chest. “Well, hey, its quality literature. I’m allowed to enjoy a good book when I want.” She replied, making Twilight giggle. “Look. I want you to be happy, Twilight. Better for that than for you to just kinda feel like you have to mope in the background. You’re still you, after all. Just, you with a bigger bust. And a butt to bounce ten bits off of.”

Twilight looked over her shoulder, her wings giving a small twitch as she tried to gaze down at her posterior. “It’s not too big, is it?” she asked.

“You kidding? The way stallions are these days, you’re stacked in every way possible. Trust me; before long, we’ll have to be beating them away with a stick from the doors to the castle.” Rainbow told her. “I’m gonna hop in the restroom real quick, use the little filly’s room. You keep at it, Twilight.”

“Ok, Rainbow.” Twilight said before watching as the pegasus departed for the bathroom, leaving her to herself again. The pegasus’ reassurances quieted any concerns that had been rolling on the back of the alicorn’s mind. She was right: she looked great, and she should relish it now that she has the body most stallion’s dream of seeing in a mare. Who was to say she couldn’t enjoy a little company? Why shouldn’t she?

Twilight’s cheeks darkened a little as she hovered on such ideas, running her hand over one of the dumbbells. If she was only slightly pretty before, now she was absolutely gorgeous, going off how surprised Dash was and how other ponies have been staring. In fact, when was the last time she’d allowed herself any type of personal pleasure of that nature? It’d been weeks, even longer, a realization that made her desire for attention expand a little more in the comprehension of just how satisfying it’d be to have some proper male company for once instead of the sole service of her fingers and magic.

‘But who would be the one for that?’ her mind pondered as her gaze lifted from the dumbbells to wander about the gym area. If she were attuning herself to her personal tastes, then going for the big and bulky stallions was a pass. Not that they didn’t hold their own appeal, but for some reason, having to inwardly compete for dominance with a stallion of equal or larger size didn’t work for her. She always had an idea that her ideal partner was somepony who was her size, or smaller, which was much easier to achieve now with her new form. It wasn’t so much a question of control then, but more of just enjoying one another. Though there itched an idea or two of being the larger pony under those bedsheets with the stallion under her…

Her gaze settled on one figure she recognized, idling over by the reception counter of the gym where everypony checked in. A white-colored stallion, firm and lean, but contained within a height that put him a head beneath Twilight’s height. His name was Spot Check, Twilight knew, and he was both a frequent visitor of not only the Ponyville Gym as a trainer and assistant, but also one who visited the library within the crystal castle at many given instances. He was always researching techniques and ideas for muscle improvement and wellness, his studiousness appreciated by the bookworm mare. His short-trimmed brown mane allowed an open view of his young appearance, a touch of handsomeness woven into the youthful eyes and face he had.

A devious smile played upon the lavender alicorn’s lips, and she left the dumbbell stand to approach the stallion in question, a sway in her step as her tail flicked behind her idly. She missed out on the stares she received as she walked, many a head turning to watch her go as she walked in Spot Check’s direction.

“She cancelled today? Again?” Spot asked the receptionist at the counter, the tidy-looking blue and white colored mare nodding at him.

“Miss Daisy had a family obligation come up, she said. So I’m afraid she had to cancel for today.” She explained, leaving Spot to frown to himself at the explanation.

“Gee. That must be a really sickly family, if its the third time this month a close family member’s gotten sick.” He remarked, his dry tone matching the roll of his eyes. “I don’t even push her that hard compared to others.”

“Either way, at least you have free time to — oh!” The receptionist cut herself off as she peered behind Spot at something, quickly sitting upright. “P-princess Twilight!”

Spot Check turned around and looked for the oncoming alicorn mare approaching the two of them. What confused him at first though was that he didn’t see any sign of the lean, thin alicorn coming their way; instead, he could only see a mare approaching who looked like the end goal of every mare he’d ever trained. Walking with a confident stride, her steps only enunciated just how in-shape she was, going off the workout clothes she had on and how little they did to hide her developed figure. But the coloration of her mane and her fur, as well as both the wings and the horn on her head, made Spot do a double take.

“Twilight?” he repeated in surprise when the mare came to a stop before him. “Is that...you?”

“Yep! It sure is!” Twilight replied, giving a warm smile to the smaller stallion as he stared up at her, needing to now with how close she was. “I’ve been putting myself through an...experimental workout regiment. How do I look?” She asked, cocking her hip to the side and resting a palm on it as she looked to him.

“Wow, you...geez.” The white-coated stallion murmured, losing the words he had in mind as he realized just how well Twilight’s figure had blossomed. The old image of the thin, somewhat serene mare was shattered by this new appearance, exuding strength but also feminine appeal in the sheer lining of her curves. He couldn’t help a brief cursory glance at Twilight’s new chest, the impressive mounds looking full and plump atop her chest as she stood there. “How did you get to this?”

“Like I said, an experiment went the way I hoped it would. Now I look much more like I should instead of the little girl I was before.” She explained. “It’s kinda complicated, but it's the genuine article. No magical enhancements, no drugs, no illusions.”

Spot Check wasn’t sure what to say, his mind mystified by how much progress the mare had made in the time span of their last interaction. It was true that the last time he’d seen her had been a few weeks ago, but nopony had ever made this much progress so fast!

“Sure wish I could try that experimental routine.” The receptionist mumbled, brushing her mane behind her ear as she sat there. Twilight heard her, and her smile widened.

“I might be able to help you out one day, Primrose. I’m still figuring it all out though.” She told the mare before turning her eyes back onto Spot. “Speaking of though, I’m in need of assistance with something from you, Spot.”

Getting his attention back onto her face and not how tight her pants were clinging to her hips, Spot Check nodded and cleared his throat. “Yeah? What can I do for you, Princess?”

Twilight gave a small giggle, her body jiggling from the motion as she shifted her stance to a more relaxed one. “Well, I’d like an expert’s help with studying some facets of my experiment, up close and on hand. I can only do so much, and smart science requires having more than one analysis done by a scientist. So, if you’re free, do you think maybe you could help me? Today?”

Spot Check rubbed the back of his head in thought before answering her. “Well, my main appointment for today passed on her routine again, so, I’m free yeah.” The words had scarcely left his lips before Twilight had grabbed for his hand, pulling him with her as she aimed for the exit of the gym. “T-Twilight?”

“Good! Then come on. I’m in need of some extra expertise. And you’re just the stallion for the job.” She declared as she looked back at him, her mane falling down over her shoulder in a waterfall of purple and pink that let her pretty face show better. Enraptured, Spot Check did little to oppose her, following her out the door and leaving the receptionist to watch the two leave. Though she had kept quiet elsewise, her cheeks darkened at the scandalous thought that crossed her mind as they’d left.

Had Princess Twilight, the Princess of Friendship, the mare who often needed a textbook reference for social exercises, just...picked up a stallion to take home for fun? She thought she’d seen her lick her lips when her head was turned away from Spot Check, but...maybe she was wrong?

“Hey, Primrose!” The scratchy voice belonging only to Rainbow Dash got the receptionist’s attention again and made her look away from the door and to the athlete. “Did you see Twilight go somewhere? I’ve been looking for her in here, and I can’t find her.”

“She uh...she just left. With Spot Check.” She answered the prismatic mare. “Said something about needing his...expertise?”

Rainbow stood there, taking a moment to process what she heard the mare in front of her say before tilting her head.

“Don’t tell me she used the word ‘experiment’?”

Twilight’s Castle - Some time later

“Keep going...that’s it. You’re doing it!”

“Ung! It’s tough! I don’t know if I can…”

“You can! Keep pushing! You’re almost-”

“Almost...almost...there!”

A clang of metal filled the personal bedroom of the alicorn after Twilight’s declaration, followed by a sigh of relief from the purple alicorn as she lowered her arms, peering up at Spot Check’s face above her, upside down from her vantage. She could tell he was smiling, impressed by the weights she’d managed to move of her own ability. “How was that, Spot?”

“Perfect, Princess. Your newfound muscle strength is phenomenal. Where before you were keeping to light weights, it looks like now you’ve gotten much stronger.” He appraised, watching as she leaned up and sat upright again. Beads of sweat rolled down her forehead and down her neck and chest, but she let them be for the moment as she focused on Spot’s analysis. “This experiment of yours, as far as I can tell, has really improved your health overall.”

“Thank you, Spot.” Twilight said. She stood from the workout bench and stretched, arching her back and throwing her arms behind her to run a hand through her mane. A quick side glance told her Spot was watching, and she gave an exaggerated groan as she held her stretch before relaxing. The calculated gesture by her made the stallion watch a second longer than usual before he turned his eyes back to his clipboard that she’d given him earlier.

‘He’s watching me more. But it’s still taking a bit of work. Need to keep things going…’ Twilight told herself.

The excuse of bringing Spot Check into the castle for his analysis on her experiment’s effects wasn’t entirely illegitimate. In truth, Twilight had wanted his opinion because it truly did align with the research side of her brain, seeking a secondary expert’s thoughts on the outcome of her magical experiment to improve her body. When she had explained it out to him, he had admitted he found the idea intriguing, since it was a peek into alicorn biology that most ponies didn’t consider looking into. It’d led to a thoughtful conversation on muscle mass and biological development compared between regular pony species and Alicorns, which then led to physical demonstrations to test a broad range of her abilities.

All in all, it confirmed Twilight’s hypothesis as she’d held it in the beginning. But with that affirmation solidified in her mind, her interests soon worked themselves back to a much more intriguing physical interest: Spot Check himself. The close up company he’d provided thus far allowed Twilight to better appreciate the fine tone and appearance in the exercise-talented stallion. The bookworm’s confidence was improved as she continued to catch the small glances and hidden looks he sent her way when he thought she wasn’t looking, telling her she was getting through somewhat. His consistent fixation upon her now much more bounceable chest and wide rear end assured her she bore physical traits in his interest range. Now it was just a matter of getting to that point.

“Oh! I know something that I haven’t done!” Twilight exclaimed as an idea hit her suddenly, getting Spot to look at her again. “I just have to find where I put it…” she murmured as she looked about the room before walking towards her main desk. Of course she knew what she was looking for: the more important matter was, was Spot looking too? The busty alicorn leaned forward and down, opening a drawer she knew didn’t have the item she needed, but offered the angling she sought.

“What uh...what might that be? Princess?” Check managed to let out behind her. A quick glance behind the mare let her see Spot watching her, eyes glued to her back end as she stayed put, letting her hand rummage through the drawer. A small shimmy of her rear made Spot’s eyes follow, and a grin crossed Twilight’s lips at the knowledge he couldn’t look away. Finally, the mare rose up again, giving a light tug on her tight-fitting workout pants before opening another drawer and finding what she needed: a roll of measuring tape.

“Well, clearly my physical structure has changed. And while I could do it myself, it's easier to let somepony else do this for me instead, to prevent subject bias from interfering.” She explained before holding up the tape for Spot Check to see. “Would you be so kind as to help me measure myself?”

Spot Check seemed to be momentarily confused before he spoke up again. “Your...your measurements, Princess?” He asked.

“Correct.” She affirmed, her inner schemer delighting as she handed Spot the roll of measuring tape. “Don’t look so spooked; you’re not going to be arrested for touching a Princess, Spot, I promise.” The reassurance seemed to ease him a little, but the stallion still approached carefully. Twilight only smiled as he unrolled the tape and started with her height, keeping near the taller mare as he went about the task. The batting of her tail against his face when he leaned down while doing her height may have been a touch forward, but Twilight was having fun with this new experience, and from the way Spot had yet to genuinely retreat, he was as well.

“Where the heck is she?” Rainbow Dash questioned to no one but herself. The pegasus had left the gym shortly after Twilight had apparently ran off with Spot Check, to Tartarus knows where. She’d checked the spa, the markets, everywhere else in town that she could’ve gone to. Rainbow hadn’t thought Twilight had the guts to literally bring the guy home, but here she was, flying by each window to try and peek for a sight of the two maybe possibly in the middle of a liplock. The teasing fuel would give her material for weeks!

“Come on, come on...stupid giant crystal castle.” Rainbow grumbled before hovering by what she believed was Twilight’s room. Cautious as she hovered from above the window, the pegasus lowered herself gently down and gazed through the window, taking care to keep to a corner spot for both an easy getaway and to keep herself covered. It took a moment to recognize the figures inside, but Twilight’s lavender coat always made her stand out. The sudden movement of Twilight’s figure moving closer to what she thought was Spot’s made Rainbow blink before a blush crossed her cheeks.

“Holy shit, she’s actually doing it.” She whispered to herself as she looked on.

“P-Princess?” Spot’s voice was confused, but Twilight paid little heed to it, instead continuing to use her magic to essentially pin Spot’s hands between her shoulders, the positioning making several interesting things happen. The measuring tape he’d been using to help measure her bust — something she assured was entirely professional for him to do — was now drawn tight to her breasts, pushing against the thin cloth of her workout bra. It made her chest lift a little more, though there wasn’t much room for any movement with Spot being so close to her as he was. Being almost eye level with her cleavage made it difficult for him to look up, but he did so, holding the gaze of the watching Alicorn.

“Spot, I’m afraid I might not have been 100% truthful about this whole endeavor thus far. Approximately more in line with about...80% truthful.” She told him, bringing a hand up to rest on his shoulder while the other settled on his right side.

“W-what about particularly, Princess?” Spot asked.

“...normally I’d be asking you to call me Twilight. But this works too.” She murmured before continuing on. “I know plenty about my new physique. More than most would, really. But, I’ve also wanted to explore other avenues of interest in relation to my new form. Things of a more physical nature than just good exercise.” She told him. The glow of her horn seemed to brighten a little as she watched him.

“I don’t...understand?” Spot replied. “Did I do something wrong?”

“Oh, no, you haven’t. Not at all.” Twilight told him before inching closer, her chest almost brushing his chin and making him glance down briefly before looking up again, blushing as he did so. “See, this whole experiment’s given me a new outlook on my appearance. On being and feeling more like a mare than just the local bookworm. But I still want to test drive a couple other things. Things you need another pony to do. Specifically, a cute stallion who I’ve come to appreciate.”

“...oh. Wow.” Spot murmured, giving a slow nod as comprehension crawled through his mind. “I didn’t...uh. I mean, you’re a Princess. I would think a guy like me’s out of your...usual range?”

“Funny you should mention that,” Twilight said, moving her hand from his shoulder to his neck and letting her finger trace a circle there as she spoke, “because I’ve thought about it. A lot. And I realize a lot of mares might go for that boring old standby of getting some tough, big stallion as a bed partner. But the more I thought on it, I realized that wouldn’t be too much fun for me. It’d be too much focus on him, and not myself. But if it was a stallion of a smaller stature, one of good health, good standing in the community, an appreciation for literature like myself, well...that’s much more appealing.”

Spot Check listened and only nodded, permitting Twilight to continue. “Of course, I couldn’t just up and ask you as the old me. The me back then was so...unsure. So divided. But now, well, I feel so much better about it. More...capable, if you will. And so here we are.” She explained. “And nopony has to know either. It can be just our little secret.” Twilight brought her muzzle closer towards him, lowering her voice to a whisper as she watched Spot, who was enthralled before her. “Yours, and mine.”

The brown-maned stallion stood transfixed at the bold offer coming from the lavender mare. He’d never have imagined himself being in such a situation like this, not especially under the stare of the Princess of Friendship herself. Would any other stallion say no to this chance? Spot Check didn’t need to bother with thinking further on the idea though, as Twilight decided for him and planted her lips firmly on his in a surprising, tender fashion that swept out any thinking left in the smaller pony’s mind. Twilight kept taking the initiative, guiding the lean stallion backwards until he bumped back against her bed and fell backwards, bringing her with him due to his hands on her back still.

With an “oomph” sound escaping his throat, Spot reigned in his thoughts and just let go, returning Twilight’s kiss much to the mare’s pleasure. The caress of her soft lips on his enticed him further, his hands being released by her magic to let him wander along the lines of her back and shoulders while Twilight’s hand busied itself with running through Spot Check’s mane. If the stallion had to put words to Twilight’s kissing technique, it was almost methodical, precise as she made sure to stay close and allow him to breathe, but always catching him in another lip lock before a second could pass by. His face warmed as Twilight’s free hand wandered the expanse of his side, drifting to his taut belly to caress his abdomen in slow strokes.

Not wanting her to feel left out, Spot brought his hands down to brush against the bases of Twilight’s wings, fingers running along the thin fur before squeezing the muscle beneath in a kneading massage that made Twilight give a shiver and moan above him. He took this as a good sign and kept up his efforts, finding a reward in Twilight’s invading tongue as it greeted his waiting own in his muzzle. The flicks of her tongue were a little cautious at first, but before long, she was giving broad swaths that made Spot’s pulse race at the sensation. The feeling of her exploring his cheeks and tongue, combined with just how warm and soft she was all over him, left him defenseless before the alicorn’s affections.

When she withdrew to let him breathe again, Spot was left panting for breath while gazing up at Twilight, the mare staring down at him with wanton lust on her face. So many sensations, both old and new, were running through her body from head to toe. The unexpected addition of Spot’s wing rubbing was a lovely touch to mix into the kissing, something she appreciated as she realized how sensitive said wings were now. Realizing her hand was close to the lining of his shorts, Twilight grinned wider and gripped the cloth while watching Spot’s face.

“I think we’re a little overdressed for this exercise routine. Don’t you?” She asked, her horn glowing alight. Spot only nodded, lifting his lower half up a little to let her be able to better slide his shorts down. Leaving them down at his knees, Twilight’s magic tugged down his boxers as well, leaving him bare from the waist down as he felt his shoes and socks be flung off as well. He was half hard, a dull throb pulsing through his wakening shaft as he kept his eyes on the buxom mare above him. Feeling his stare, Twilight smirked before the sports bra she’d been wearing finally came loose, being undone by a burst of magic and flung aside to let her breasts dangle free before Spot’s vision.

The full, hefty breasts gave a jiggle before settling as Twilight moved upwards, her height advantage making it easy for her to place them squarely over Spot’s face and immerse him in the warmth of her tits. His hands came up and groped them on both sides, squeezing and feeling the squish of her breasts in his fingers, evoking a pleased sigh from Twilight. Not to be outdone, Twilight’s hand groped for Spot’s cock, wrapping her fingers around him and pumping him in slow strokes that picked up speed as he hardened in her grasp. The heated length in her hold soon became hard enough that Twilight could appreciate its full length, coming out longer than average with a delightful thickness she could feel herself wanting.

Spot’s efforts took her attention away from his length momentarily, however, once his lips had latched onto a dark-colored nipple and he suckled at the tender flesh. Twilight gasped, then arched her back to press her chest forward further into his face, encouraging his efforts moreso. For Spot’s part, his world had become a hazy mixture of enjoying the heat and feeling of Twilight’s breasts against his hands and face, tasting her on his tongue as he licked at her nipple while savoring her stroking his member. He couldn’t ever recall the last time he’d been with somepony like this, let alone this beautiful. Twilight’s paced stroking only fueled his flames further, as droplets of pre began to leak out from his tip to trail down his mottled length.

“That’s so good, Spot...keep toying with my breasts!” She gasped out, releasing his cock to bring her hand down to cradle his ballsack beneath it. Her soft fingers kneaded the smooth flesh of his balls with ease, hefting their weight as she relished the stallion’s actions. Likewise, Spot Check couldn’t help but to moan into the titflesh surrounding him from the ball massage he was enjoying. His hips gave a jerk upwards on reflex, making Twilight give a playful laugh as she carried on for a couple more minutes before stopping. She pulled her breasts away from Spot’s face as well, the stallion now red-faced as the lavender mare stared down at his expression.

“Foreplay is always so nice...but if you don’t mind, I want to indulge a curiosity.” Twilight told him, making him only watch in confusion as Twilight moved herself down his body, letting her breasts drag against his bare skin. Spot caught on once it was too late, letting out a groan as his length became immersed into Twilight’s cleavage. “I’ve read a stallion who has a well-endowed marefriend enjoys action like this. I’ve never been...well, big enough to do it. But now with this new body…” she trailed off as her hands squeezed around her breasts and tightened her hold around his cock, evoking a moan from Spot Check. “It’s good, isn’t it?”

“I-It’s amazing!” He grunted out. The entirety of his lap had become a pool of warmth, spread over his groin and emanating pleasure from his cock. Twilight’s breasts made the soft imprisonment all the more enticing as she squeezed around him, kneading him through her breasts as she worked him over. When she started to move up and down, bringing her breasts up and then lowering them until his tip poked out from the top, it made Spot’s mind go numb from the pleasure. The friction, the heat, the passionate, lustful look on Twilight’s face made him feel lost in her efforts, a feeling he welcomed as Twilight worked him over all the more.

“I can feel how hot your cock is, Spot. You’re putting out so much pre, its making my breasts all wet.” Twilight’s comment drew Spot’s focus down to her breasts and away from her face. As she said, his pre was leaking out in copious amounts, streaks of clear liquid leaving not only the tip of his length shining in the room’s bright light, but dampening the fur of Twilight’s breasts surrounding his tip and letting him slide better through her cleavage. He bucked his hips again, making Twilight give a surprised gasp at his enthusiasm before moving her breasts in rhythm with his hips’ jerking motions. It allowed his tip to further emerge from her valley, wet sounds coming from her cleavage as he pressed on.

“P-Princess, I’m...I’m getting close!...” he tried to warn her.

“Then I better decide quick if I want you to finish on me, or if I want a snack...decisions, decisions…” Twilight hummed, smiling to herself as her horn began glowing again. Spot was confused for a moment on what she was doing before moaning as a heated pressure began rubbing against his balls, squeezing them gently while Twilight looked on. “A good scientist never wastes, but I wonder just how much you’ll put out?”

Spot’s mind ran wild with the idea she suggested, envisioning in that instance two separate images. The first was of Twilight in a mixture of surprise and excitement as his climax fired off onto her chest and neck, even her cheeks as it poured out of him. He’d stain her lavender coat with white streaks, looking on as they trailed down her skin as she coaxed more out of him to lavish onto her large breasts. But, his mind insisted, what if she swallowed? The idea of the Princess of Friendship’s lips around his swollen member, tongue flicking around his rigid cock as she milked his seed and drank of his essence right down her gullet, made him groan even louder.

“Gonna cum! Twilight!” He warned as the throbbing that had been running through his member peaked, the pulses echoing through his form and culminating in an intense pressure that shot through his length and out into Twilight’s breasts as she squeezed her breasts tight around him, further stimulating him as his first shot blasted out and splashed onto her breasts and cleavage. Spot opened his eyes to watch as more of his essence surged out, thick dollops of his cum spreading over her neck and chest as Twilight looked on, her eyes wide with surprise at the intensity of his climax.

“Oh, wow...I never knew a stallion could produce such a copious amount of sperm like this!” Twilight exclaimed, running her fingers along one streak and lifting her digits up to inspect it. Ever the scientist, she sniffed his essence first, taking in his musk before her long pink tongue lapped it up from her index finger. The stallion could only watch, feeling his cock giving a few waning pulses while still trapped in her breasts as Twilight weighed out the taste of his seed. Seeing her swallow it made him shiver, particularly from the devious grin she gave him. “...so delicious!” she declared before going to work on lapping up what of his seed she could get, treating Spot to a show of her running her fingers through his seed on her breasts and licking it up to drink down. The show she put on kept him hard, enough so that only the trails of cum remaining on his shaft gave away any evidence he had climaxed.

By the time Twilight finished, there still remained a sheen of fluid along the tops of her breasts that only added to the sexual allure she was putting off. When her eyes met his again, Spot could see the hungry desire in them and felt an odd mixture of both intimidation and arousal from the stare coming off her violet orbs. The room was silent, save for the deep breaths Spot was still taking post-climax, as Twilight slowly crept up over his form. She stopped when her head was over his, and claimed his lips in a kiss that held even more passion than the ones previous to it. For a brief moment, Spot felt a bitter shock of tasting a bit of himself on her tongue, but it was soon overrode by her own taste after a moment’s passing before she pulled back.

“I want more, Spot. More of this thick rod,” Twilight whispered as her hand reached behind her to grab at the base of his length, “and its cum. Do you think you can give it to me?”

“Yeah.” He whispered back, eyes on her face as she peered down at him. “I think I can manage that.”

“Good. But just to be sure…” Twilight murmured before her horn began glowing again. Spot wasn’t sure what her intent could be at this point, since he was hard as stone in her grasp. He got his answer as he felt an alien sensation hug his balls before seeming to seep into him through them. It made him shiver beneath the alicorn, the sensation giving way to a feeling of weight filling into his sack that confused him until Twilight continued. “Now you’ll definitely give me what I want.”

“T-twilight?” He questioned, but the alicorn tuned him out as the sound of fabric ripping came from behind her. Spot Check tried to look and see, but he couldn’t make anything out past her sides or shoulders. “Everything ok?”

“More than ok. I just saved time by making a new hole in my workout pants. I’ll fix it later. More important things going on right now.” She answered, moving her lap over his before lifting up to straddle his rigid cock. The swollen tip was aimed straight upwards at her waiting pussy, grinding against the soaked entrance as she shook her hips in preparation. “Oh Celestia, I want you to fill me up.” Hearing that kind of talk from a mare who two weeks ago would stammer through such a phrase made Spot blush, before his thoughts melted away as Twilight sank down and swallowed his tip into her entrance.

The sensations of heat and tight friction greeted Spot in a rushed instance, overwhelming thought and pushing him to the brink of basic instinctual need, a need for more of the pleasure Twilight was offering from their joining. Twilight’s gasp told him she felt much of the same above him, and soon they were both moaning as she sank further down onto him. Inch by inch, he felt her walls squeeze him, his own girth spreading her with every bit she took of his cock. It was almost a struggle, from the wet sounds her now filled pussy made as he kept sliding into her. He was waiting for her to stop, to adjust, but Twilight’s lust seemed to be as never-ending as her nethers were. She only stopped once she came to a stop at his base, fully sheathing the stallion’s member within her depths.

“Holy fucking...Tartarus! You’re tight!” Spot groaned out before falling back against the bed from his attempt in raising up. Twilight’s hands were the cause, pressed firm against his chest as she hovered over him, her mane falling about her face. The ecstatic expression on her face, cheeks flushed red as her tongue hang from her mouth, made Spot’s cock throb within her clenching depths.

“So good...so full! More! I want more!” She exclaimed before lifting her hips up, her tight walls hugging his shaft as they tugged from the sudden movement upwards. She only got up to halfway before she slammed back down again, Spot able to make out the fleshy slap of her rear clapping against his thighs amongst her moans and the wet sounds her nethers made around his cock. Pinned as he was, Spot Check could only look on as the alicorn took him for a ride. The rise and fall of her body made her breasts bounce in tandem with her motions, captivating Spot’s attention as much as the feeling of her body’s claiming of him.

Twilight had let go of rational thought and gave way only to instincts, her desire for the smaller-statured pony beneath her pushing away any other thoughts save for getting to enjoy more of his cock inside her. Her hips worked themselves on their own, bouncing faster and harder as the bed shook from her efforts. The alicorn could tell Spot was enjoying it from how much he was throbbing within her. Had she not made him orgasm earlier, he would’ve been done already by now. But thanks to her patience, she could enjoy a much more fulfilling ride now than before. And what a ride! Spot’s cock was hitting all the right spots inside of her, making her clench around him as her juices flowed past the tight seal his cock made within her to lubricate her motions better.

Her fingers groped at Spot’s chest, nails grating against his fur as she bounced on top of him. The smacking sound of her ass bouncing off of him filled the room between her labored, eager breaths, and her gaze fell onto Spot’s face as he was captivated by her. The sheer awe in his expression made her heart flutter, and she leaned up to let her breasts bounce closer to his face. He accepted the silent offer, grasping for her bouncing breasts and latching onto a nipple with greater intensity than before, sending more shocks of pleasure through Twilight’s body as she rode the stallion harder. His suckling lips made her nerves shock to life within her, and Twilight’s hands lifted off his chest only to grab for his head and pull him in deeper into her cleavage.

Being forced to let go of her breast from her movement didn’t deter Spot Check any, since he could now lavish her cleavage and breasts with attention aplenty. Even though air was limited within her cleavage, Spot didn’t stop his ministrations, his hands working to grope and squeeze whatever he could get ahold of of her tits, her scent washing over him as he felt her grasp his cock tighter within her depths. The wet rush of motion in and out of her was almost overwhelming, but he held on if only to keep pleasuring the princess claiming him.

“Oh fuck. Oh fuck! Fuck me! Fuck me with your cock!” Twilight’s voice was at a higher pitch as she rode every wave of sexual ecstasy their joining was giving her. She was rushing ever closer to her impending climax, a powerful wave coiling within her depths that was begging to be released. Her hips ground into Spot’s lap as she clenched tight around him, pausing for only a moment before beginning to bounce again, savoring how his girth brushed against every untapped part of her nethers that even her own toys couldn’t fulfill on their own.

It wasn’t meant to last forever though, if Spot’s moans from her breasts were any indicator. He hadn’t tried to pull away yet, but his body was tensing up beneath her. He was getting close too, she could tell, but was trying to hold out for her sake. It was flattering, but Twilight’s lust demanded she win out. Lowering her muzzle to Spot’s ear, the words left her without nary a thought needed to conduct them. “You want to cum too, don’t you, Spot? You want to fill this princess’ horny pussy? Rut me till I’m full of your cum?” Spot’s weak groan confirmed this for her, and she grinned. “Give it to me, Spot. Give me all of it. Cum!”

The bare minimal resistance Spot Check had left gave way then, collapsing as he clasped onto Twilight’s sweating form and groaned into her cleavage, his cock throbbing before a surge of pressure seemed to balloon out of his balls and fire through his cock into her waiting womb. It was a heavy first shot, even thicker than the one before, and spread along Twilight’s pink walls before another wave followed, then another. Pump after pump of his cum flowed into the alicorn’s needing pussy, the heat and thickness of his cum blasting Twilight’s senses into oblivion. She gave a shout, and her head went slack as an orgasm rocked over her body. Her own juices gushed out from her stuffed full pussy, adding to the messy flow of white pouring out from her stuffed nethers and out onto her thighs and the bed itself beneath her.

“So...so much. Oh stars above.” Twilight whispered to herself. She stayed put on top of Spot, keeping her position even as the stallion fell back from her, head emerging from her cleavage to lay against the pillows on the bed. “It feels so good…” she continued, peering down at Spot’s flushed face, sweat trailing down his neck and red cheeks as he watched her back, his gaze telling her he too was completely satisfied. “Thank you, Spot. That was...that was so much fun.”

“No kidding.” He panted out, resting a hand on her thigh as she stayed put. “You’re incredible, Princess. I’ve never had an experience like that before.”

“Oh, you thought we were done?” The question made Spot Check blink and look again at Twilight, up from her sweat-and-saliva dotted breasts to her face. “No good experiment’s finished after just one test, Spot. We have to...verify results.”

“...oh boy.” Spot mumbled as Twilight only grinned, clenching around his half-hard shaft that was still buried within her.

Outside the room, back against the wall and out of sight from the window, Rainbow Dash was similarly panting for breath, if for a different reason than her lecherous friend inside her room. Her pants were tugged down, having been that way for the past while as she’d listened in to them inside the room. Fingers stained with her own juices, Rainbow gasped for air while replaying in her mind’s eye what she’d witnessed from her window vantage. She wasn’t sure what it was that got her off more: the voyeuristic pleasure of watching the couple fuck each other’s brains out, or the sheer dominant energy that Twilight was putting off. Whatever it is that she’d done to herself in those two weeks, it was working out tremendously.

‘I gotta get the facts from her on that at some point.’ Rainbow thought to herself before snapping back to reality as the window suddenly opened, making her fall over herself as she scrambled to cover her decency. It seemed to be for naught though, as Twilight stood there in front of her. Her torn pants were stained white still, and Rainbow could see a couple rivulets of sperm make their way from her swollen pussy down her thighs.

“Twilight! Ehehe. Uh. This is...this is uh…” Rainbow searched for an excuse to cover herself, though she knew she was busted. Tartarus, the whole window porch smelled of her own scent and now Twilight’s and what she presumed was Spot Check’s musk.

“If you want in on this, then get in here instead of making a mess on my porch.” Twilight’s words made Rainbow stare in confusion before Twilight giggled. “Besides, I need data on how well a female responds to my transformation. Not just a male.”

“...holy shit.” Rainbow muttered before scrambling up and slipping into the room, Twilight closing the window with a haughty smirk.

Author's Note

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