Portalbelt XXX

The next few tests gave Rarity some chance to rest. First, Twilight wanted to document how easily Rarity's nethers could be cleaned without removing the belt, and so Rarity endured the disconcerting sensation of Twilight applying a shower-jet and flannel through the portals, scrubbing down her aching vulva and anus — a process that was drawn out by the excess semen oozing and lube out of both holes. Eventually, the flow ceased and Twilight was able to finish the job to her own satisfaction. Having recovered her breath and the strength in her legs in the meantime, Rarity was then able to put the shower to work on herself, smoothing out her messed-up mane and soothing her tired muscles.

Twilight stood outside the shower, taking notes but also displaying obvious interest in watching Rarity work the soap suds all over her body. Around halfway through, Twilight stepped out of the room to fetch some additional device, which she then proceeded to set up over the bowl of Rarity's toilet…

Having established that Rarity could, indeed, use the toilet via the portals — an experience made only worse by having Twilight watch and take notes — and having cleaned up after, the two proceeded to Rarity's kitchen, where Twilight insisted on attempting to spoon-feed Rarity through the portal mask.

The attempt proved somewhat successful once the central strap had been removed — before that the mask held her jaw too tightly and prevented chewing. Twilight scribbled down some more notes, muttering something about a redesign. After that, the mask was removed and Rarity allowed to finish her meal in peace. Twilight explained that she had further arrangements to put in place, and that she would return the next day at 11. With that, she departed, leaving Rarity alone with the belt secured in place and the controls explained, should she need to use the bathroom again in the meantime.

It wasn't the first time she'd had to sleep wearing a chastity belt. At least this one was more comfortable than the last.

…

True to her word, Twilight returned the next morning at 11am sharp, saddlebags bulging with new equipment.

“So then dear,” asked Rarity once they were both inside, “more testing?” She smiled nervously.

“That's right!” Twilight smiled. “I'd like to set up in your bedroom, if that's okay.”

“Of course, darling.”

Rarity followed, and watched Twilight unfold a set of panels which attached to the headboard of Rarity's belt. There was a pair of dials, both reading zero, both with space for double-digits. There was a flat, grey-white board in the middle. There were shackles on either side. Those at least, Rarity recognised the function of.

“Alright, Rarity. For this test I'd like you to lie on your front with your forehooves secured here” — she gestured the shackles around the headboard — “and I'll secure your hindhooves at this end.” She lifted another pair of shackles from her bags — Celestia only knew how she fit so much in there. With more portals, maybe.

Rarity climbed into place on the bed as directed, positioning her head in front of the central board, and spreading her legs so that she could be secured into place. A quiver of anticipation ran through her as the last lock clicked into place.

“Ahem.” Twilight raised a pointer to indicate the dials. “Today we'll be testing the portals' interaction with my orgasm detectors. These 'cum counters'” — she gestured the dials on the left and right — “will track the number of orgasms achieved. The left panel will count orgasms you administer orally.” She lifted a simple collar with a small pink heart on it into place around Rarity's neck. “You can open the portal on this panel by directing a small amount of magic here,” she gestured a small orb at the top of the panel, “and it will gently repel any intruding material before closing automatically after it registers an orgasm.

“The right dial will track any orgasms other ponies experience through the belt, and any that other ponies give you. Those portals will operate automatically, once the experiment begins. The other ends are set up in Ponyville spa — Saturday mornings are always busy, so there should be no shortage of patrons.

“To release the locks and end the experiment, there needs to be a total of at least four orgasms on the dials, with more on the left than the right. Do you have any questions before the experiment begins?”

“Uh…” Rarity shook her head, processing the implications of this set-up. “N-no, that all makes sense…”

“Great!” exclaimed Twilight, pushing a button and causing the machine to bleep.

Rarity froze up, caught unprepared by the sudden commencement. Automated nozzles once again deluged her butthole in lube, pumping a generous dose directly into her rectum before withdrawing. She tensed in surprise, tugging against the restraints holding her firmly in place, and barely regained her composure enough to relax for the first stallion to enter her quivering pussy.

This stallion seemed willing to take things slowly — fortunately for Rarity, as he was by no means small. Thinking fast, Rarity realise she had already given a head-start to the opposition in this challenge, and directed her magic to the controls, preparing to suck her first cock of the day to climax as quickly as possible.

When the portal opened, however, what greeted her was not a penis, but a familiar-looking yellow pussy, spread to reveal the pastel-pink insides. The sight gave Rarity paused — surely this marehood belonged to Fluttershy, who had always been so hesitant about anything sexual…

Another penis rammed against Rarity's butthole, stretching her ponut around the well-lubricated glans. Coupled with another, deeper, thrust into her vagina, it reminded Rarity that she hardly had time to hesitate. She dove forwards, pressing her muzzle into the hot wet folds in front of her and closing her lips around Fluttershy's clit, causing the pussy to twitch. Rarity was more used to providing fellation than cunnilingus, but that certainly did not make her inpet.

She moaned as both her rear holes were filled, pushing the vibrations from her throat onto her lips. She rubbed her face up and down against Fluttershy's entrance, tongue working her friend's love button as she alternated licking and sucking, building up a steady rhythm to outpace the double penetration she was receiving in her rear.

Rarity could feel the tension starting to build within her loins, promising her the first orgasm of the day. Remembering that her own orgasms would be counted against her, Rarity fought to keep her mare-parts under control, breathing steadily while working Fluttershy's cunny as best she could.

The dials chimed as the cock in her ass reached a climax, and began pumping its seed into her. From Fluttershy's quivering, she could tell the other mare was close, but if Rarity had to satisfy at least another two mares after this, her tongue was going to get tired fast.

The stallion in her pussy was still going slow, but Rarity was struggling to keep calm under the deep, filling strokes. If she and the stallion both came, that would be three points against her… she silently willed Fluttershy to finish faster, trying to decide if it was worth switching tack to try and bring her to a climax sooner, or if that would only waste time. She tried running her tongue in circle's around the other mare's clit instead of sucking, and was rewarded by Fluttershy's folds clamping down on her muzzle, fluids spraying onto her face and into her open mouth.

The dial chimed, as Fluttershy continued to quiver. Meanwhile, the stallion in Rarity's ass withdrew, gently tugging her insides as he went. The stallion in her cunt, though, was picking up the pace, and Rarity knew her own orgasm was becoming unavoidable.

She pulled away from Fluttershy, hoping to quickly move on to the next pony. Sure enough, the portal closed off. Rarity knew she needed to send a pulse of magic up to the controls, but focussing was becoming hard as the tension of her rising climax threatened to overwhelm her. She barely managed to focus through the tension, to activate the portal a second time, before the dial chimed to count her own peaking orgasm.

He cunt spasmed as pleasure pulsed through her, against her protests. As she clamped down on the stallion's cock, he too reached his climax. The dials chimed again as his cum spurted into her. She was still shuddering when another penis, this one dark brown and mottled, emerged from the portal in front of her. Not wanting to fall behind, she quickly threw herself onto it, sucking and licking it fervently even as she rode out the spasms that shook her body.

Before the stallion in her cunny had a chance to withdraw, another cock drove deep into her slime-coated anus. Her limbs continued to tense against her restraints as her hips bucked helplessly against the twin shafts. She drove the cock in front of her into her throat with desperate abandon, its entrance lubricated by a mix of her saliva and Fluttershy's juices. Whichever stallion she was swallowing on responded with thrusts of his own, matching Rarity's speed. She had no idea who this belonged to, or if they had even met, but at this point she hardly cared. Her eyes watered as she forced his cock deep into her tight throat, rushing to finish him as quickly as possible.

The stallion who had filled her vagina withdrew, and she enjoyed only a brief respite before the portal over her pussy switched to a different patron. Almost immediately, a tongue pushed into her folds, eagerly scooping out the residual cum. Mare or stallion, she had no idea, but this anonymous pony was clearly eager to taste Rarity's sticky, cum-filled cunt.

The shaft in her anus was not especially thick, but it was long and Rarity felt it ram deep into her insides. With the other shaft sunk deep into her throat, the phrase “spit-roast” had never felt more apt.

Whichever pony had chosen to lick out Rarity's cunt, was now moving onto her clit, seemingly with every intent of making the bound mare cum once more. Though the tongue work wasn't fast, Rarity realised that she was dealing with somepony more skillful then herself, as she felt the first shivers of pleasure run through her sooner than she had anticipated.

Salty goo filled her mouth as the dial chimed once more. She slipped down off the shaft, swallowing some of the seed but allowing much of it to spurt over her face when the cock popped out of her mouth, the still-erect shaft slapping heavily against her brow. She lay panting, still doing her best to ride out the combined thrusting and licking assailing her rear, as she waited for this stallion to withdraw so that she could begin sucking the next.

Trying to gather her thoughts, she turned her gaze to the dials. Two points on the left and three on the right meant she needed at least three more to win… She wondered if she would ever catch up, and how long Twilight would allow this to continue if she could not.

Before she could dwell on that for long, the stallion in front of her had withdrawn, and she was facing a blank panel again. She focused her magic and opened the portal once more, preparing to deliver her third bout of oral. She still had her safeword at least, loath as she was to use it, but if Twilight believed Rarity could do this, then she at least intended to give it her best effort.

Another stallion pushed his shaft through the portal — this one a creamy yellow, with a reddish-brown head. She greedily wrapped her lips around it, running her tongue around the tip and purring into it. Somepony was sucking on her clit and she was powerless to prevent the fresh orgasm welling up inside her. She felt a mixture of relief and emptiness as the cock in her ass withdrew — she wasn't sure if he'd cum inside or not…

This cock resisted her efforts to deep-throat, pulling back when she pushed forward, so she switched to heavy tongue action instead, twisting her head from side-to-side as she swirled her tongue around his glans. She forced herself to continue this steady rhythm even as her second orgasm began to wash through her, somepony lapping up every drop of fluid squeezed from her pussy.

Thick, salty goo flooded her mouth and this time she gulped it all down without even thinking. The shaft withdrew, and she summoned another. Somepony was sticking a tongue into her butthole. Another cock was stretching her cunt and her belly was being rammed into the bed.

Before long, things started to blur. How many stallions had she fellated? She didn't stop to look at them now, just sucking and thrusting as fast as her throat could take, the taste of cum permanently filling her mouth. Her face was covered in goo. Her ass and pussy both ached, but another orgasm assailed her — how many was that, now? She was almost certain she was gaining ground, that she must be close to the orgasm that would tip the balance in her favour, releasing the locks and finally allowing her to rest, but her eyes were blurred and she didn't have time to stop and look properly.

Another stallion emptied his load down her throat, before withdrawing. She summoned the next portal to be greeted by another marehood — this one already oozing cum. Without hesitation, she dove forward to begin pleasuring the other mare, fully ready to suck cum from a stranger's pussy.

At the same time, a mouth closed on her own fold, tongue swirling around her clit. She sucked, and somepony sucked her. She ran a tongue over the strangers folds, and somepony ran a tongue over hers…

She hesitated. The licking stopped. Another penis was slowly working its way into her ass, but Rarity… she stared at the pale grey pussy staring back at her, twitching when she twitched, her own pussy.

Confused, she glanced at the score. Both dials displayed a twelve — if she could pleasure one more pony, she would win… but if she had another orgasm, that would count against her — was winning impossible?

Twilight had noticed Rarity's confusion. “If you make yourself cum, it will only count on the left dial.”

Rarity nodded, and immediately dove back in, relaxing into the autocunnilingus. Just one more… she just needed one more orgasm to win. She sucked and swirled, letting her own pussy telling her exactly how to deliver the fastest pleasure. Just a little more… she was so close.

The dial chimed, but not from her. Another load of semen filled her intestines, another stallion finding pleasure in her asshole. She pushed forward. Two more — she could manage two more.

The stallion withdrew. Shortly after, another entered. Rarity quivered, pushing herself right up to the edge. Another cock slid into her ass, but the dial chimed as Rarity shook from her self-administered orgasm, drinking cum and marecum straight from her own cunt. One more — it was a race against this stallion, who only had the slightest head-start.

Twilight moaned. The sound surprised Rarity, but she didn't let it distract her. A cloth wiped Rarity's face, wiping the goo clear from her eye so she could see more clearly. There beside her, Twilight had set up a chair, and was working a portal-fleshlight down her own shaft, taking Rarity's ass herself. Rarity shot a dirty look in Twilight's direction, but didn't let up from sucking on her own cunt.

Twilight grinned impishly. “Hah… sorry Rare, couldn't resist…” She rubbed the toy up and down her shaft, impaling Rarity's asshole, cum oozing out with each thrust. She lifted a vibrator to her own pussy, part-hidden beneath her ballsack, to order to doubly pleasure herself. Rarity recognised Twilight's moans and knew how close her friend was.

She redoubled her efforts. Her mouth ached; Her tongue threatened to cramp up. All the muscles in her rump were screaming at her to take a break, but Rarity knew she needed to finish before Twilight if she didn't want this to drag on. Through sheer willpower, she drove herself onward to a shattering, all-consuming orgasm. Her ass gripped Twilight's cock so tight, Twilight couldn't pull her own median ring out. Her cunt squeezed until her muscles burned. Her body shook and she threw back her head with a howl of torturous ecstacy.

When she finally came down from her peak, the locks were gone, and she curled up tight. Twilight had cum from the spasms of Rarity's climax, coupled with her own masturbation. Rarity hadn't really noticed. She lay quivering, her body continuing to spasm even as the last dregs of strength left her. Twilight set about cleaning Rarity's ass and pussy, this time using her own mouth to do so, gently and slowly lapping all the excess fluid away. When she finished cleaning through the portals, Twilight climbed up onto the bed and began licking clean Rarity's face. The two said nothing, but Rarity slipped her legs around Twilight and held her close, so Twilight stayed beside her and returned the embrace.

The two stayed motionless together for over an hour before Rarity broke away, rolling onto her back.

“Darling…” she breathed… “could you perhaps… help me to the bathtub? I think I need a long, hot, soak.”

…

Across town in Ponyville spa, Pinkie Pie licked her lips and patted her belly. She'd guessed correctly — cream-filled Rarity tasted good.