Mutant Mare Matinee
 
Prompt -
Boundless tries out a new dress, then treats Anon to a little show - and more. (Not connected to her main story; anthro because why not)
 
Tags - NSFW, Fallout: Equestria, Anthro, 2nd Person, Large Pregnancy, Size Difference, Fellatio, Telepathic Dirty Talk
 
When Boundless told you that she wanted your opinion on a 'secret project', you weren't sure what to expect. You certainly didn't expect her to have you wear a blindfold for ten minutes while she got it ready. Still, you decided to humor her, which is how you wound up sitting in the corner of her room with your hands in your lap, temporarily unable to see, listening to various fabrics being rummaged through and moved around. At least the blindfold's nice - cotton, maybe. Still, by the time the noise comes to a stop, you're getting a bit fidgety. You can't help but wonder if it's all on purpose.
 
"Alright, hon. You can look now."
 
You peel the blindfold off your face and look up at Boundless, who's smiling expectantly with her hands behind her back. She's a full two heads taller than you - three if you count the horn - so needing to look up isn't unusual. What *is* unusual is her outfit. The utilitarian overcoat and simple clothes made from scavenged material are conspicuously absent - in their place is what could only be described as a ballroom gown, upsized and tailored to her unusual physique and of much better quality than average. It's an armless halterneck with a high neckline, complimenting her broad shoulders as well as her substantial bust. The entire article is a deep maroon colour that plays off the olive and forest greens of her coat and mane, conforming easily to the curves of her unnaturally tall and slender body with the blatant exception of her waistline. The twins are getting very good at testing the elasticity of her wardrobe.
 
Boundless clears her throat, blushing slightly. "Well? How do I look?"
 
She's wearing thigh-length tights and some slick-looking satin evening gloves; even a little silver necklace that she must have scrounged up somewhere. You bite your lip - in all honesty she looks like she's trying to give you a boner, and boy are you glad you kept your hands in your lap. Still, you try for something a little more tactful and tell her she looks like a princess. It suits her, what with the whole alicorn thing. She smiles pleasantly and takes a step forward, her tail swaying slowly along with her hips.
 
"Good answer, hon. I was afraid you'd think it looked a bit small - you have no idea how hard it was to find a decent dress or how long it took to upsize without damaging anything."
 
You point out that it's a lot fancier than her usual and ask if there's a special occasion she's getting ready for. At that she leans forward, cradling the weight of her belly with one hand and poking your chest playfully with the other.
 
"No, nothing special - I just wanted something pretty to wear. There aren't many of these in my size, you know." She leans back and stretches luxuriantly to her full height, towering over you and putting her hands on her hips. "And it's not every day I get a chance to show off."
 
You nod; it's just a shame she can't show her creations off more often.
 
Boundless takes a few slow steps away from you, flaring her wings as much as her small room will allow and giving you a pleasant eyeful of her rear side. The dress flows down her back and rump like water, flaring out to enfold her belly just above the waist. "Well, I do plan on holding onto it. The whole thing was Auri's idea, actually. She thinks it might help if we ever need to negotiate with the 'high class' ponies at Tenpony Tower. It'll need a little tightening up before then, but for now..." She pauses, finishing her sentence by folding her arms behind her head and posing, back arched. Side-on, with every sweeping curve highlighted by the form-fitting gown, she's quite the sight. And judging by that smile she's wearing, that throbbing between your legs was exactly what she was going for.
 
"Ahh. Well, thank you hon," she sighs, relaxing, "I'm so glad you liked it. There's still a few adjustments to make so I suppose that'll do for now." She pauses, and then that smile creeps right back onto her face. "It took a while to get all this on, what with my magic so weak. How about a little help getting it off again?"
 
You swallow reflexively and nod, moving up behind her. It's a simple button-up deal that leaves plenty of her back exposed to make room for her wings. Before you can do anything Boundless takes one of your hands and guides it to the small of her back, then slowly drags it to her side and around the broad curvature of her belly. You have to keep inching forward just to keep up, until you find yourself half-hugging her from behind. Reaching all the way around is out of the question.
 
"Slowly," Boundless purrs, her tail brushing against your legs as your chin meets the space between her shoulderblades, "we don't want anything getting strained."
 
Carefully, you release the buttons one at a time; Boundless stands patiently until you're done, gently stroking your hand as she keeps your palm in place against the surface of her swollen middle - you're used to this by now; she's in one of those moods where she wants validation and attention more than anything else. Her calm and casual tone is just an act - this close, there's no mistaking the tension in her stance; the slight hitch in her breathing. If you weren't used to her company it would border on intimidating - that slender-looking build is more solid than it looks. All the surface softness is layered over a very palpable layer of muscle. She's not bulging with brute strength like the stories of mutants you've heard would suggest; she's limber, sinewy as tightly coiled cable. Whether that's down to whatever arcane science made her what she is or just good exercise, you're not really in a place to speculate.
 
Boundless shrugs the dress from her shoulders and steps out, then folds it neatly and sets it aside. Almost nude, she removes the long gloves with unnescessary slowness; she knows you're watching. She enjoys it. Her breasts rest heavily atop her twin-filled belly - alicorn-sized bras are a luxury she can't afford. Suddenly she turns and herds you back to your seat, grinning widely. "You've been very patient, hon. Putting up with me being all fussy." You mumble that it's nothing, but she's not having it. Guiding you into a sitting position, she moves forward and rests herself in your lap, steadying herself by holding onto the backrest. It creaks under your combined weight, but holds steady. She straddles your legs; her belly fills your lap with warm, potent mass, forcing you as far back into the seat as you can go, and her chest fills the bulk of your field of vision until you look up into her eyes. Eyes that shine with playful intent and salacious ideas. "You know, we're going to be all alone for a little while. Corona's busy with her science and we've got almost an hour until Auri checks in from guard duty. How should I reward you for being so helpful, hmm?"
 
It's a rhetorical question, of course. You're in no position to decide anything. Nonetheless, you rest your palms on her belly. Boundless makes your hands look tiny; all that extra height really accentuates how big she is - it's all proportionate to her frame, but compared to the average mare she's simply huge in every respect. You ask her how the foals are doing, dragging your palms in slow circles across the great green expanse of womb pinning you to the chair.
 
"Fine, hon. Just- ohhh..." Her wings flutter and her eyes begin to drift. You smirk at the reaction you cause as you bring your fingers into play, kneading firmly with the tips and digging in the heels of your hands. Not roughly, but with enough force that you can feel her body give way just a little; feel the internal pressure resist you. There's so much tummy on display that you can outright grope it. You're easily at full mast now, the bulge in your pants compressed under her weight. She has to feel it. Her response is quick and decisive - holding your head she pulls you closer, closer, until you're practically draped across her, your face buried in the cushiony cleft of her bosom. She smells of earth and freshly machined cotton. Your hands wander to the widest points of her belly, practically hugging it, kneading and toying with her stretched and tender skin.
 
It isn't long before you start to feel movement in response - the twins are awake, and apparently just as interested in playing with their mother as you are. Boundless collects herself and smiles, fingertips sliding down your neck. Her breath quickens, deepens, a bright flush sweeping across her face; those stocking-clad thighs squeeze your own as she squirms and leans into you even more, all that weight bearing down on your body, her plump navel poking you just below the breastbone. "Goodness, hon," she murmurs before pausing to lick her lips, "If I'd known you were so into this sort of thing I'd have hired you earlier."
 
You rest your head between her breasts and, peeking up at her, point out that you're not the only one.
 
"Oh, you have no idea how into this I am," she says, ruffling your hair. "Now, stay right there. This can't all be about me." She carefully pulls out of your embrace and down onto her knees in front of you, her stance wide with that belly in the way, and even like that you're eye to eye. Almost as soon as you register what she's doing, her hands make quick work of your pants and your manhood springs free. You'd never been unsatisfied with your size in that area, but Boundless makes it look small - like even looking at it is doing you a favor. Then before you can speak, you feel her tongue, broad and thick and wet, cradling the base and rising to the tip in an agonisingly quick sweeping motion.
 
"Nervous, hon?" Boundless asks, resting a steadying hand on your knee. Trembling and sweating buckets, you shake your head. "Don't worry," she croons softly, leaning in again, bathing your length in her warm breath. Her horn alights and you hear her voice whispering in your head, while at the same time a smooth flick of her neck has her take the entire thing into her muzzle with a single motion. *"I'll talk you through it."*
 
You can't help but arch your back and grab onto something as the tip of your cock bumps the back of her mouth, that leathery tongue coiling around it; all but encasing it in a tunnel of solid muscle that twitches and squirms, teasing and exploring. *"What's the matter, hon? I'll stop, if you want."*
 
You shake your head. Not that you have the capacity to form words right now - Boundless' motions are slow, and you can't tear your eyes off her. That sultry, knowing stare she gives you as she makes your entire cock disappear effortlessly - the plump, heaving breasts below that, resting atop that gloriously swollen belly. Presumably her telepathy spell isn't very draining for her at such a short range - she doesn't seem bothered by it.
 
*"Never been sucked off by a pregnant mare before?"*
 
Again you motion in the negative, taken off guard by the directness of the question. You've never been sucked off by a mare mutated into the image of a princess while she talks straight into your head before either, but you keep that bit quiet. And on the subject of being taken off guard - nothing could have prepared you for when she starts to bob her head, lips sealed tightly together, adding pleasurable friction to the bath of heat and moisture already soaking your dick. *"Look at you, getting blown by a mutant. How dirty. How depraved. What would the ponies back home think?"* You know she's just playing around - you know she's more than that and she does too - but she's pressing all sorts of buttons and damn if it isn't working. Everything feels stiff; twitchy. You're not going to last long like this.
 
She's had practice; or perhaps she's just a natural, or perhaps it's an alicorn thing, or- *"My sisters are missing out,"* says the voice in your head, sultry and soft. Boundless' tongue slides all over, squeezing and caressing, leaving tingles of sensation buzzing wherever it touches, and your train of thought comes to a sudden and complete stop. *"You're thinking about me, aren't you? All swollen and heavy. All yours."* Your hips jerk on their own, involuntary, and you blow your load right into her mouth.
 
The door opens. Boundless blinks in surprise at the sound and swallows quickly on reflex, which just sets you off again. In the doorway stands Auriga, a full nine feet of dour, intimidating purple alicorn, a long piece of rebar hovering idly in her magic. With Boundless hunched over you she can't quite see what you're doing, but her raised eyebrow and rail-straight lips say everything there is to say about her mood. "Sister? What are you doing?"
 
Boundless splutters, eyes wide, the light of her horn winking out in an instant. She sits up but carries on looking straight at you, rather than back at the door. A string of your seed trickles from the corner of her mouth. "What are *you* doing, Auri?"
 
"I came inside to speak to Corona. There were..." She pauses and sniffs suspiciously. "Noises."
 
"I'm taking his measurements, Auri! For clothes!" It's a bare-faced lie, and Auriga doesn't budge.
 
"You're naked," she points out.
 
"It's hot!"
 
"I can see that," the purple mare says with the smallest of nods. "You're both very sweaty. Perhaps we should find you a fan."
 
Boundless huffs indignantly, her cheeks overcome with a furious blush. "Do you want something?"
 
"Only to see that my dear sister is safe and making productive use of her time."
 
"Mission accomplished! Well done!" Boundless blurts out. "Everything is perfectly fine!"
 
"Quite. You have half an hour to finish your business before dinner." Auriga closes the door and leaves as promptly and dispassionately as she arrived, leaving you and a very flustered Boundless alone once again. There's a few long seconds of heavy, awkward silence.
 
Boundless wipes her muzzle and grouses out loud, "I swear she does that on purpose."
 
You shrug. No harm done, and hey - half an hour!