Portalbelt XXX

Twilight stayed with Rarity the rest of the afternoon. She claimed it was for observation purposes, and she continued to take notes, but Rarity suspected that her friend (mistress? domme?) was worried about her. Rarity knew Twilight always ended up feeling guilty after their more extreme sessions, the Element Bearer of Friendship couldn't let her dominant side out without worrying she'd gone too far.

Of course, if Rarity did or said anything to call attention to this, it would only make Twilight feel more guilty for spoiling Rarity's enjoyment of the submissive role. The discussion would have to wait until after the experiment was over, and in the meantime all Rarity could really do for her friend/mistress/etc. was to keep smiling and enjoying the attention. Not that Rarity minded a little pampering, especially (her loins quivered at the thought) if Twilight still had another day of this experiment planned.

And so most of the afternoon became a visit to the spa. Rarity was able to recover and unwind with a soak, a massage, and some time in the sauna. Twilight was able to take even more notes on the belt's resistance to water and heat, and they were also able to thank the Spa twins for their help in setting up the morning's activities. Rarity knew the pair could be trusted for their expertise and discretion in selecting participants.

Both mares blushed and stuttered though, failing to meet Rarity's eye. From their response, Rarity suspected that not one but both of them had themselves chosen to take advantage of the opportunity — not that Rarity minded. She knew Lotus had both mare and stallion parts — though Aloe, she recalled, was “all mare”. She'd certainly eaten out at least one pink pussy this morning — though she had to admit, the uncertainty was a little embarrassing. Twilight collected a list of participants, of course, for scientific completeness, but Rarity felt it would be most unsporting to ask for a copy.

By the time evening rolled around, Twilight was looking jittery. They returned to the boutique, and had barely stepped inside before her doubts rose to the surface.

“Are you sure you're okay? You've been wearing the belt for over twenty-four hours now, and you've been through a lot of strenuous activity. I know we planned the whole weekend, but we can cancel early if you're not feeling up to it.”

Truth be told, Rarity had been having a few doubts herself. If the last two sessions were anything to go by, whatever Twilight had planned for tomorrow might be more than she could handle.

“Well…” Rarity hesitated. She didn't exactly want to end this early, either, “why don't we discuss what you had planned for tomorrow, darling? I know we both normally prefer to keep it a surprise, but…”

“Okay.” Twilight nodded.

She stayed for dinner, and they discussed her plans for the day ahead. Rarity was relieved to learn that the planned activity was not as physically strenuous, and she marvelled at the other mare's creativity. Once again, Twilight left the controls with Rarity, who turned in early and slept with the belt on, fatigue from the day carrying her to sleep swiftly…

…

Mid-morning the next day, many ponies greeted the two of them, as they walked sedately through the streets of Ponyville. The enthusiasm of some other ponies may have been in part due to their activities the previous morning — Rarity looked forward to at least a week of embarrassed speculation every time somepony acted friendly toward her — but may also have been due, in part, to the elaborate dresses, manestyles, and makeup both wore. The inhabitants of Ponyville were not used to ponies getting “fancied up” with any frequency.

Their enthusiasm was almost certainly not, however, due to the main cause of the girl's embarrassment. After all, only the two of them knew of the “belts” they were both now wearing, along with the ring keeping Twilight's penis quite erect and throbbing, nestled snugly inside Rarity's cunt. To keep it that way, both ponies kept their pace slow and gentle, as they made their way through the busy crowds, across town, towards Sweet Apple Acres.

Every so often, Rarity would clench up, giving Twilight a playful squeeze.

It was a nice feeling, having somepony just there, inside her, not pounding her silly, barely moving back and forth with each step, occasionally twitching against her walls.

…

By the time they reached the barn, Rarity was quite worked up and ready for the next step. Judging from Twilight's expression, the feeling was mutual. Twilight knocked three times on the door, which creaked open to reveal Applejack's eye, peeking out at them through the gap. Seeing who it was, Applejack opened the door wider and beckoned them both inside.

Once the two of them were inside, Applejack shut and barred the door behind them. Almost immediately, Twilight dropped into a seated position on a nearby hay bale, back against one of the wooden pillars.

“Fuuuck!” she exclaimed loudly.

“Language, darling.” Rarity giggled and pressed a hoof to her belly, pushing hard enough to feel the bulge of Twilight's shaft inside her, massaging herself deeply in the hope that some sensation would transfer through to Twilight's dick. Apparently, some of it did, as Twilight tilted her head back and moaned.

“Yeah, Twi!” Rainbow Dash exclaimed, dropping from the rafters to land between them. “Why would a pretty pony like you use dirty words like that?”

Twilight shot Rainbow Dash a dirty look, but while at the same time hitching up her own skirts to gain access to the device underneath.

“You, uh, did get yourselves awful prettied up for coming here,” Applejack commented.

Rarity grinned, and leaned in towards her. “Well, we know how much you like mares in pretty dresses, darling.” She reached up and nipped gently at Applejack's ear while the farmpony blushed.

“Ugh,” Twilight granted, having unfastened her belt. Slowly, she lifted the panel from her crotch, the portal within slowly divulging her slickened shaft with a soft wet sound. Rarity shuddered as the throbbing phallus was slowly extracted from her. All eyes were on Twilight's penis, though. No pony moved or spoke, so when the portal reached the end of her dick, the wet plop of her glans pulling free of Rarity's dripping snatch filled the air.

Twilight turned the panel outwards, so that the other girls could all see Rarity's still gaping vagina. Applejack whistled.

“That,” Applejack said, “is some nice gizmo you've built there, Twi.”

“Really,” Rarity faux-pouted, “the 'gizmo' is nice, huh?”

“Well, I can use that to pump your pretty pussy, right?”

Twilight had lifted a grey cylinder from her saddlebags, and now she transferred the portal from the belt to the fleshlight, which she passed over to Applejack. She grinned. “I was thinking you could pump her pussy while you sit on her face — double the pleasure, right?”

“And we just watch?” interrupted Rainbow Dash.

“Actually, Rainbow, I was hoping you could fuck me with my own penis.” Twilight lifted a third belt from her bags, and offered it to Rainbow Dash.

“Oh, I am all over that.” Rainbow grabbed the belt and began slipping it into place around her hips.

Lifting her skirts, Rarity trotted over to just beyond Twilight, where somepony had set up blankets over piles of straw — a padded floor perfect for rutting. Applejack followed behind, just close enough for Rarity to flick the farmer's nose with her tail.

Rainbow finished securing the belt, and Twilight activated the portals before slipping her own belt back down over her shaft, which immediately emerged from a panel between Rainbow Dash's legs, as if the pegasus had suddenly sprouted a deep purple penis of her own.

“Awe-some,” Rainbow squeed, giving “her” new member a test stroke with her wingtips. Twilight moaned appreciatively, and trotted over to join Rarity.

Rarity lowered herself as gracefully as possible onto the ground, rolling onto her back and resting her head on a mound in the blanket, and bringing her forehooves up together onto her chest. Applejack clopped around to be standing over Rarity's head, bringing her own rump down towards the fashionista's neatly made-up face. She was facing towards Rarity's tail end, and so her own tail came to rest over the tip of Rarity's horn.

Twilight, meanwhile, climbed on top of Rarity, lowering her own chest down onto Rarity's forehooves and pinning them in place. Twilight's face was inches from Applejack's now fully erect member; She had to tilt her head around to one side just to avoid being poked in the eye.

Even as she lowered her front half, Twilight raised her rump, lifting her dress, flicking her tail forward, spreading her hindlegs, and magically pulling her pussy lips aside to invite Rainbow Dash in. Dash needed little invitation, swooping down behind Twilight, forehooves on Twilight's rump and Twilight's own cock aligned to the bookworm's dripping purple pussy.

There was a moment's hesitation as all four ponies waited for the others to be ready. Rarity breathed in the smell of Applejack's aroused sex, staring up at her vagina and anus. The warm weight of Twilight pressed down on her, the heat of Applejack's thighs bathed her cheeks.

Applejack and Rainbow Dash shared a look, a moment of bonding over the dominant positions they had over the ponies underneath them.

Then Applejack kicked things off by sliding Rarity's pussy down onto the tip of her cock. Rarity groaned lustfully and shoved her face up into Applejack's rump, which came down to meet her, grinding against her muzzle as she pushed her tongue and open mouth in between Applejack's folds.

Rainbow Dash thrust forwards, ramming Twilight's cock into Twilight's pussy with force that made the other mare cry out in pleasure, before Twilight herself stretched her head forward and sucked one of Applejack's balls into her mouth.

The four ponies became a medley of moans and squelches. Rainbow pounded Twilight mercilessly. Before long, Twilight was pumping cum into her own cunt, but Rainbow Dash was unrelenting and the over-stimulated Twilight was somehow staying hard. Rarity's juices ran generously down Applejack's shaft to where Twilight hungrily licked, sucked, and slurped them up. Applejack rocked back and forth, grinding her crotch against Rarity's face and pumping Rarity's pussy down onto her shaft like nothing more than a toy. Beneath them all Rarity shuddered and writhed, needily sucking on Applejack's clit.

Fluids ran down Twilight's legs as she shook from double orgasm, spasms shaking her body. Applejack began to wail as her own orgasms fast approached, her forehooves gripping the Rarity-fleshlight tightly as she instinctively timed the strokes to bring both sex organs to climax simultaneously. Rarity was already cumming, but didn't pause in her attention to Applejack's snatch.

When the farmpony finally reached her own climaxes, she let the tube slip free from her shaft. Ropes of cum arced through the air onto Twilight's head and back, soaking into her dress and mane, dribbling down her horn and face to where her mouth continued to slurp. Twilight began to work her way up Applejack's member as it flopped onto her face, eating up the rivulets of cum that made their way down. Beneath Applejack, Rarity gulped down the fluids that had squirted into her mouth, while still more coated her face.

When Applejack's spasms subsided, she flopped down onto her side, with traces of Rarity's makeup smeared across her hindquarters. As if on cue, Twilight also dropped, all strength leaving her hindlegs as she finally allowed them to un-tense. That left Rainbow Dash standing over her and Rarity, with Twilight's mostly flaccid but still thick and heavy cock swinging between her legs, dripping fluids onto the dresses of the mares huddled together below her.

As the only pony not currently collapsed from exhaustion, Rainbow Dash took it upon herself to make the next move. Jump-gliding her way up to where Twilight and Rarity were cheek-to-cheek smearing various fluids onto each others faces, she swung Twilight's member down to the vicinity of their lips, posing herself cockily over them.

Without needing a work, Twilight reached up and slid a tongue around the rim of her own cock-head. She reached up one hoof onto Rainbow Dash's leg to pull her closer, and Rainbow happily obliged. Twilight shuddered as she got to lick her own mixed cum and pussy juices off her twitching shaft, while Rainbow watched hungrily. Seeing what was happening, Rarity lifted her head and began to assist Twilight's attempts at autofellatio. The two mares slipped their mouths and tongues up and down the length of Twilight's shaft, brushing muzzles against each other and swapping glances into each other's eyes. At one point, their horns collided and slid over each other — when they did, a blob of Applejack's cum from Twilight's horn stuck to Rarity's, stretching out between them as they continued to slide their heads up and down. Twitch by twitch, Twilight's member began to stiffen once more, preparing for another round. Rainbow Dash slowly swayed her hips, rubbing Twilight's cock against the two mares' faces.

When it was almost fully hard, Rainbow Dash pulled away and swung her head around, her body mostly now occupying the same position Applejack had held previously. She used a wingtip to gently hold the back of Twilight's head, and looked down at Twilight's face, with its smeared makeup and plastering of Applejack's cum. Twilight looked back up at her, straight into her eyes. Saying nothing, Twilight understood and eased herself into a slightly straighter position, tilting her head back and opening her mouth wide, angling her own throat straight towards her own throbbing shaft.

Grinning, Rainbow Dash slowly and gently thrust forward, only gently gripping the back of Twilight's unresisting head as Twilight found her mouth filled with her own cock, which was already making advances on her throat. Twilight groaned at the wondrous feeling of being autofellated.

If Rainbow Dash had thought things through a little more, she might not have been surprised when Rarity reached up and planted her mouth onto Rainbow's vulva. Not that Rainbow Dash had any objections, but that didn't stop her from gasping and twitching with surprise, thrusting a little deeper into Twilight's throat than she'd planned to do at this point. Fortunately Twilight seemed to have no problem with this, in fact taking the opportunity to push forward, taking her shaft deeper still.

Rarity, too, was a little surprised to feel a tongue probing her nethers. Not wanting to be left out, Applejack had rolled the cylinder up to her face, and was now having a taste of her own spunk mixed with Rarity's marecum. Well, Rarity didn't have any objections to that, either.

Rarity did her best to match her head bobbing to Rainbow Dash's thrusts, but it quickly became apparent that everything worked out better if Twilight did most of the thrusting, so instead Rainbow opted to help her along, gripping Twilight's head more firmly and driving it down onto the cock. Twilight greedily swallowed her own shaft, eyes rolling from the pleasure. Rarity pressed her face in deep against Rainbow Dash's marehood, intensifying her licking as Rainbow Dash began to quiver.

Rainbow came first, having been waiting on edge the longest. She shuddered and squealed but Rarity continued her ministrations, intending to coax at least two orgasms out of Rainbow Dash before she relented. Rarity herself was second, wrapping her thighs tightly around Twilight as her climax began crashing through her.

Between Rarity's firm grip and Rainbow's spasmodic thrusting. Twilight herself was not far behind. She grabbed Rainbow's buttocks and held on tight as she unleashed her own seed straight down her throat and into her own belly. Her orgasm was the shortest of the three, though, and she soon after collapsed, sliding off her own dick once more, this time coughing and gasping as her lungs burned for air.

Rainbow Dash fell onto her side, but Rarity followed her, working out her own orgasm by helping Rainbow achieve another. Rainbow Dash writhed on the barn floor as Rarity locked forehooves around her hips, Rainbow's hindlegs gripping Rarity's head tightly. Only when Rainbow's quickened panting and moaning, and the spasming of her cunt, signified a second orgasm, Rarity let go, allowing Rainbow Dash to reciprocate in her own time.

Twilight and Rarity lay side-by-side, both exhausted, both covered in sticky fluids, their dressed ruined and their manes disheveled. Rainbow Dash was panting, satisfied but not yet exhausted, while Applejack was already mostly recovered, and quite hard again from what she had just witnessed.

Not wanting to leave her friend out, Rainbow Dash crawled over to Applejack, placing her lips onto the farmgirl's tip and working saliva around. Since Applejack was mostly lying down, Rainbow maneuvered around into a sixty-nine position without thinking. Twilight mewled as Applejack began to tease her now completely flaccid member.

Rarity pulled over the discarded cylinder that held the portal to her pussy. She wasn't really planning to do anything with it. Not much anyway. Just a few gentle “cool-down” licks as she watched the scene unfold.

Applejack had pushed herself into a more upright, seated position, forcing Rainbow Dash to raise her rump high. Rainbow had Applejack's shaft well into her mouth and making inroads into her throat, working her way up and down with singular focus. Twilight lay curled up and rocking on the barn floor as Applejack coaxed her into yet another erection, but she made no effort to protest or ask the farmpony to stop.

As Rarity watched, Twilight's shaft regained a half-erect stiffness, and Applejack took the whole thing into her mouth. Rarity couldn't see, but could well imagine, Applejack's tongue swirling around as Twilight's shaft grew thicker still insider her mouth and throat.

When Rainbow Dash had managed to take the entire shaft into her face, Applejack straightened further, spreading her legs and lifting Rainbow's hindlegs clean off the ground. Rainbow's eyes went wide and her hindlegs kicked the air as Applejack lifted her and began to bounce her up and down — Rainbow Dash stretched one wing up between her hindlegs and began to masturbate. Still curled up, Twilight seemed unable to tear her eyes away from the pair of them.

Gulping, sucking, squelching noises filled the barn. The other girls watched Rainbow used like a sex toy while Applejack deepthroated Twilight's cock. When Applejack came, cum bubbled out of Rainbow's nose and around her lips. Her hindlegs crossed and shook in midair as she reached her own climax. When it was over, Applejack had to help Rainbow Dash down gently so the normally athletic pony wouldn't simply fall and injure herself.

Twilight sighed. She hadn't cum again, but she was too exhausted to push for another climax. Instead, she reached down and removed her belt, pulling her stallionhood out through the portal.

“I…” she gasped, “I think that's enough, for me.”

Rarity was enjoying playing with her own cunny, but had to admit she was too worn to really get invested in it, so she set the cylinder down and murmured assent.

“Yeah, I'm good for now,” agreed Applejack.

Rainbow Dash raised a wingtip in a gesture of affirmation, still collapsed on the floor.

…

By the time the other girls had recovered, Rainbow Dash had fallen asleep. They left her on top of a hay bale; She could take care of herself when she woke up. Twilight offered to teleport herself and Rarity straight back to the boutique's bathroom, and Rarity all but leapt at the suggestion. Figuratively, at least. They stayed to help with the cleanup, first, but with Twilight's magic and Applejack having planned ahead, it didn't take all that long.

Back at the boutique, the pair showered together. Rarity's belt was removed, all the devices set aside for cleaning. Afterward, Twilight gathered up her research notes, thanking Rarity for being such a helpful test subject, and explaining that she would be returning home to compile her results.

“Very well, darling, but… would it be too much to ask, if you could lend me a couple of those devices? Whenever is suitable, of course.

“I have a few experiments of my own, that I'd like to run…”