Pinkie takes a moment to properly arrange your flat and limp form across her back. Your arms dangle down her front shoulders, so she sits down and deftly ties them loosely around her front like a sweater around the neck. Your legs are longer and a bit trickier, but with some tactical butt wiggling while standing, she manages to thread them one by one under her rump and around her hind legs. She hums tunelessly to herself as she works, moving with a dexterity that makes you wonder if she’s improvising, or if she’d been planning all of this.

Finally, she raises her tail up from the dock, tucking your extremities underneath, where your dick can lay against her nethers.

With a satisfied sigh, she tenses up to bounce across the room, but then changes her mind. She takes an exaggerated step forward and in a slow, deliberate movement begins to saunter across the room. WIth your head half way up her neck, nestled in the pink curls that cling to you like velcro, you have a brand new viewpoint that’s close to the height Pinkie sees from all the time, making the proportions of the room and the height of the desk and chest of draws seem far more sensible. But more interesting is the sensation of movement along your entire body. When you walked along on your two feet, your torso was more or less just a sack of potatoes on top of your legs, which clomped along with jarring thuds - but Pinkie moved her entire body from neck to dock in a ripple that made you fully aware of all the muscles working in perfect sequence, a wave that you felt move from your chest, down your abdomen, and then in your hips that were hugging her flanks.

She was getting her money’s worth out of this as well, deliberately stretching and flexing to feel your skin moving across her coat.

“Pinkie Pie darling,” she said, mimicking Rarity’s voice, “Where did you find that marvelous cloak?”

“Well - I’d been seeing it around town for a while and I just had to to try it on!” replied Pinkie in her own voice, “And I can see myself recommending this to a lot of ponies who need to try something a ‘lil different…”

Having now done a circuit of the room in her melodramatic meander, Pinkie arrives at her dresser, where a large glass seltzer bottle with a small tumbler glass stands. Despite the fluid movement of her body, you can feel how Pinkie rolls her weight across her four hooves, and yet she suddenly leans onto her hind legs to use forelegs at the table. You’ve watched ponies do this a hundred times, never quite sure how they don’t fall flat on their faces, and now you can clearly feel Pinkie’s not-insubstantial weight move onto her back legs with complete ease.

Oblivious to this, Pinkie deftly presses the lever of the seltzer, and a stream of soda squirts into the glass. She immediately picks up the tumbler and drains it at once. Your ear is up against her neck, so you clearly hear the drink run the course from her mouth down to the middle of her barrel. Pinkie lets out an exaggerated sigh and smacks her lips.

“Okay. Break time over.”

She walks directly back to the bed in the same enticing strut, but this time with a degree of urgency that tells you she’s itching to get going again. Your member tucked under her tail is more or less a probe giving you an insight into just how ready she currently is, and at present levels of heat and damp, it seems likely that foreplay isn’t the next step.

Aligning herself parallel with the bed, Pinkie skips onto the edge and rolls onto her back again, with you pinned underneath. For a brief moment, she folds up her legs to hug herself with your limbs, and then quickly unravels herself from you and twists around to lay on top again.

“Now for the grand finale…” she says, staring you in the eyes and licking her lips.

She moves in as if to kiss you, sealing her lips around yours, and blows hard. You feel her breath rush into the empty space inside your flattened body, rippling to your limbs, and more noticeably, to your dick. Pinkie shuffles up slightly so that her crotch is just above yours, takes a deep breath, and blows steadily into your mouth again.

Weirdly, but apparently to Pinkie not unexpectedly, your cock is the first part of you to really take shape, and comically rises up from the mattress like a flagpole. Pinkie aligns her once again radiating flower over the top and attempts to thread it into herself. Unfortunately, your internal pressure is still too low, and she merely crumples your tormented manhood into your hips. It doesn’t hurt at all, but you’re finally sensing some tension down there again, as if she were bending your erection.

Lifting bountiful hips back up, your flagpole resumes its defiant height again, and Pinkie changes tactics, breathing deeply, she gyrates her flanks above you, and in a spectacular motion that she has clearly tried before, her pussy winks open and she plunges down onto your dick at the same time, clenching you deep inside.

“Just so you know,” she says, stopping everything for a moment, “There’s no other mare from here to Canterlot who can do that!”

Without waiting for a response, she dives right back into a kiss and blows heavily into your deflated form. As she does so, you can feel your dick expanding inside of her, pushing the walls of her love canal back, only to have the pulse in response.

You’ve got to hand it to her - it’s an experience unlike you’ve ever felt in any other encounter.

She continues to inhale through her nose and breath deeply into your mouth until your manhood has more or less fully regained its stature and now she’s slowly and sensually rising and falling on it, timing her rhythmic thrusts with her breathing so that you inflate a little more as her hungry pussy engulfs your throbbing shaft.

Although you’re starting to regain shape, you realise that your muscles and ability to move don’t seem to be returning. She’s turned you into her very own living sex doll, and now you’re on a test run.

With Pinkie’s steady and continual breath of life, you’re now more or less the shape your once were, but her weight still squashes you slightly. Testing to see what else she can do, Pinkie lifts up one of your arms and squees with delight as you bot discover that you’re fully posable. The arm stays exactly where she moves it to. She wastes no time in positioning one arm at the back of her neck, which she rubs against like a cat, while the other arm she deviously positions down below, where your outstretched hand strokes the very top of her folds.

“Oh, right there…” she coos, “you do know exactly where to touch me…”

You’re unable to breath, but her systematic and fluid motion on you is staggering. After what seemed like an eternity of being flaccid, yet stimulated, your dick is bigger than it’s ever been before, and the pink mare riding you is making full use of it in all three dimensions.

Unlike your balloon-like body, Pinkie has no shortage of breath, and she breaths another huge lungful of air into your mouth. You feel yourself swell, but with her dense body on top of you, the pressure is fully redirected straight to your crotch, and you feel the tip press up against her cervix, igniting fireworks in your brain and triggering an involuntary moan of pleasure from the pony.

Under this kind of stimulation, there are no heros, and with no understanding of where it’s coming from, you can feel an orgasm building like a freight train. The volume inside you is swirling around into a ball at your crotch, and for a moment, you can push back against Pinkie’s bucking hips to bounce off of her depths once again.

Pinkie herself is up on cloud nine, her eyes are closed and her mouth forming into an adorable scrunch face as she hits her climax. Her pussy clenches up once again, this time the unmistakable ripple of her folds massaging your dick from bottom to tip, pulling you into her, dragging her desire out from you until in a single perfect moment of glory, the dense vortex behind your manhood releases like a overflow valve and a pulsing jet of cum is pumped into her eager chambers. You want to wrap your arms around her, but what little life is inside you is all concentrated down below. Pinkie however has no intention of leaving you hanging, and she wraps herself around you in a vice grip, squeezing your balloon-form and pushing every last drop she can get out of you.

With the climax sustained for longer than you’ve ever felt in your life, Pinkie finally relaxes on top of you sighing so long and deeply that it looks like she’s deflating slightly herself.

“Oh,” she murmers, “Ohhhhhhhhhhhhh… That, was amazing.”

Author's Note

And that's a wrap! My first attempt at lewdity, and hopefully not my last.
This is all the material I had concept wise - but I'm all ears for taking this fic further, or maybe seeing what else Pinkie can cook up - so let me know in the comments where you'd like to see this fic go next!
Until then, my circle of sin is complete!