Twilight did not have time to mentally prepare herself. Her brain instantly formulated several contingencies, but none could have prepared her for this. To begin with, the sensation of having a living, squirming, pony on her tongue made Twilight want to hurl, but Pinkie certainly wouldn’t thank her for that, and Pinkie had been such a great… host, to her before.

Then there was the taste. Pinkie Pie just tasted of… well, it was hard to put a name on it other than just Pinkie. It was somewhere between sugary sweets and... parties; if parties had a flavor that could actually be experienced via taste buds, this was it.

When Pinkie was fully on, Twilight retracted her tongue, trying to remember what Pinkie had done last time. She would certainly want the full experience. Twilight closed her mouth and squeezed Pinkie up against the roof of her mouth, which—aside from exacting a cacophony of excited squeals and giggles from Pinkie—only released an explosion of taste to Twilight’s tongue. Her saliva glands began working overtime as Pinkie flavor washed over her senses. It was all Twilight could do not to just swallow her right then and there.

“Mmmmmmmmm-mmmm-mmmm-mm-m-m-m-m.” Twilight shivered, but held back her throat muscles from claiming their prize.

Slowly, as she began to regain control over her mouth, Twilight began to swirl Pinkie around with her tongue, moaning at the signals it sent to her brain, but focusing on giving her friend a fun time. Twilight’s mouth vibrated with her own strangled moans and with Pinkie Pie’s giggling.

The strong flavor leaking onto Twilight’s tongue was so intoxicating she nearly lost her balance. She lay down and rolled over onto her back, mouth open, chest rising and falling quickly. The squirming lump in her mouth began sliding backwards as soon as she did so, pressing against the back of her throat. Involuntary muscles began grabbing hungrily at their captive, but Twilight wanted to enjoy this a bit longer. She closed her eyes and focused on not swallowing, ignoring a disappointed moan from her throat.

Several minutes went by. Pinkie had stopped squirming, Twilight lay back, breathing slowly. The two of them consumed in each other’s embrace, when Twilight relaxed a little too much. Involuntary muscles finally triumphed, and the cute lump in her throat slid further back, down past her gullet and en route to her stomach.

“Oh, heheh, oops.”

She could feel Pinkie sliding down her throat, wriggling the whole way—now that she’d realized the fun was beginning again. It was like being tickled from the inside, and Twilight couldn’t help squirming a little at the new sensations.

“Hmm-hmm. Pinkie, that tickles.”

As Pinkie settled into Twilight’s stomach, Twilight felt a little disappointed that it was over for now, but Pinkie would come back in an hour anyway, so she picked herself up and went back to the library to check on Spike.

“SPI-IKE!” Twilight called out her favorite assistant’s name purely out of habit as she trudged through the door to Golden Oaks Library. There was a rapid shuffling of footsteps and Spike came racing down the main stairway.

“Oh, Twilight. You’re back. Pinkie said you were busy. What were you doing?”

“Oh, just some experiments with Pinkie Pie.” Twilight walked past him and up the main stairway.

“Wait, but then, how come Pinkie came back to tell me? Why couldn’t you do it? And what sort of experiments were you doing?”

Twilight gave him a blank stare. “You don’t want to know,” she deadpanned. Seeing Spike manage to fight back the question rising in his throat, Twilight continued up the stairs to her bedroom. She had some research to do.

Right as she got to her room, she felt a squirming in her gut that could only mean Pinkie had moved from her stomach into her intestines. She wasn’t used to having solid objects in there, and she could feel every wiggle, every small tickling movement her friend made. She nearly didn’t make it to her bookshelf, but finally she pulled out Obscure Oddities from her mature section, curled up on her favorite pillow, and magically flipped to the section on vore.

As it turned out, the idea had existed for quite some time—as the case would be with any idea, as an idea always exists, and simply needs to be discovered—but it never had practical use until somepony brought together a few different spells used for completely different purposes. An infinite air spell, developed for divers so they could stay submerged for long periods of time, without the use of air tanks; An anti acid spell, commissioned by a team of chemists who worked with harsh chemicals; And the latest addition, a rare compound discovered by a botanist who had accidentally ingested a few otherwise dangerous plants, and been daring enough to conduct further research on the effects it had produced.

Twilight flipped back to the front cover of the book. It was about ten years old, so it was likely that the ‘v-pills’ Pinkie had purchased were the product of that botanist’s latest research. She had said that Aloe and Lotus had developed it though…

Twilight jumped up, causing the book to flop off of the pillow. The implications of what she had just put together in her head were too intriguing to pass up. She looked at the clock, she’d only been here about 5 minutes, meaning she had a good half hour or more left before Pinkie’s turn was up. With no time to lose, she teleported straight to the main lobby of the library.

“Spike, I’ve got to check on something. I’ll be back soon, but for now… just continue whatever it is you were doing.”

Spike looked down at her from the top of a ladder with a feather duster in hand. “Uh, sure, I guess.” He turned around and picked up a book, proceeding to dust it off. Twilight took off out the door, ignoring the tickling sensation coming from a very precise spot in her abdomen. Pinkie Pie would surely thank her for this, if her theory was correct. She cast a modified version of the infinite air spell as she ran. It was a bit more complicated than the original, but it meant she wouldn’t be out of breath when she arrived.

It only took about 5 minutes to reach the spa, and she calmly strode up to the desk upon entering. She rang the little bell, and before long, Lotus appeared from behind a curtain to the left.

“Good afternoon, welcome to the Ponyville Day Spa. How can we be of service to you today?”

Twilight levitated a few bits from the small coinpurse she’d brought with her, and placed them on the counter. “I’d like a very private session with one of the head masseuses. if that’s alright with her.” Twilight looked across at the blushing blue earth pony with a wry smile. “In the back room,” she added, flashing her eyebrows this time.

“Oh, my. Um…” Lotus fumbled for the words “We wouldn’t normally but um… we are rather slow today and um… let me check with my sister.”

She disappeared for a moment, during which Twilight’s thoughts returned to Pinkie Pie. She rubbed her abdomen where she knew Pinkie was, and received a delightful tickle in response.
A moment later, Lotus appeared with Aloe, who spoke up immediately. “We are rather short on time, but a quick session could be fit in, depending on your desired activities.”

She beckoned with a hoof and escorted Twilight toward the back of the spa. The two sisters trotted perfectly upright, occasionally brushing up against Twilight as they went. They arrived at the same room she and Pinkie had used earlier, and the two earth pony sisters ushured Twilight inside.

The door closed, their demeanor changed entirely. the two of them turned on her with seductive eyes, moving with graceful but exxagerated movements. “And how may we… service you today, Miss Sparkle?” Lotus asked in a low tone, drawing out each word.

Twilight giggled a bit. “Well, we could get to the fun in a minute, but first I wanted to ask you two about something.

“Yes?” Aloe leaned on Twilight a bit, running a hoof down Twilight’s cheek and rubbing her back with the other, moving closer to her rear.

Twilight tried to ignore them, and forced herself to remember her idea. “Pinkie told me you two developed the little ‘v-pill’ you sell, in which I assume the v stands for ‘vore’.”

Aloe’s eyes flashed up to Twilight’s horn, then locked her gaze. Her seductive grin grew even wider. “And you’d like a session with one of us, I presume?” She began licking Twilight’s neck, and moving up toward her cheek. Meanwhile Lotus began rubbing her belly, which drew several wiggles from Pinkie. Twilight tried not to squirm, but a chuckle from Lotus told her the masseuse knew what her reaction had been.

“Well, not a session exactly, but as you’ve already answered my first question, I’m curious about what you two have done with it.” Twilight cleared her throat as Lotus began licking her flank. Both earth ponies ceased their advanced and stood calmly in front of Twilight, grinning eagerly.

“What are your favorite activities, as both pred and prey? I have a good friend on the inside, and I want to make this really special for her.” Twilight rubbed her belly and smiled fondly down at it.

Aloe and Lotus’s faces brightened up intensely. They both leapt forward and grabbed Twilight by the hooves, dragging her to the bed. They thrust her onto her back and crawled up on either side of her, each rubbing different portions of her abdomen.

“How far along is she? Aloe asked, caressing Twilight’s belly with her cheek.

“Um—” Twilight’s brain was having trouble contemplating the very discussion she was having. “—she just left my stomach a little while ago…” Aloe’s hooves shifted to Pinkie’s exact location.

“Ah, found her.” Aloe let out a little hum of delight. “I was the one who came up with the idea for the pill. Useful little thing. Lotus was always the predator and I the prey. We’ve switched a few times, but we both like it the other way.” She smiled and began massaging that spot on Twilight’s belly, occasionally slapping it very gently. Each time Pinkie would wriggle around and it would send shivers up through Twilight that made her feel very… aroused. “I always enjoyed when my sister would massage me from the outside. She always knew just how to get the muscles to stimulate some incredible sensations. The pill is designed to enhance your experience of course—in addition to making you just the right size for such an activity—but a little assistance from an experienced pred always helps.”

Lotus moved up and began licking Twilight’s cheek, then slid onto her and began kissing her passionately, but paused to tell her side. “Mmm, you’re tasty. Yes I was always the pred. It was fun having my sister inside me. She knew how to stimulate me from the inside as well, so we both made each other happy. You know…” She looked up at Twilight’s horn. “As a unicorn, you could make things—” She reached up and gave Twilight’s horn a lick, which only made her feel even hornier. “—even more special.”

Fighting back the moan that threatened to escape her lips—the spa twins certainly were good at their profession—Twilight asked “H-how?” Lotus continued assaulting Twilight’s horn, a sensation she was most definitely not accustomed to.

“Oh, you just modify your internal fluids a little bit. Make them more… pleasure oriented. They’ll taste sweeter, make her feel more euphoric than the pill already allows for.” Lotus let out a giggle. “Do it right and you might have to peel her off the floor when she comes out, since she’ll be gooey ball of giggles. And of course you can increase your own sensitivity, so such wiggles and wriggles—” At that moment, Aloe patted Twilight’s tummy again, drawing an especially sensational movement from Pinkie, which combined with Lotus sucking on her horn, almost threw her into an orgasm. “will ‘tickle’ your fancy as well.”

Aloe abandoned her massaging of Twilight’s tummy and hopped off the bed. Meanwhile Lotus abandoned her sensual assault on Twilight’s horn, and took her sister’s place. She turned around so her rump was on Twilight’s chest, and she could massage Twilight’s abdomen with her hooves. But she leaned down and gave Twilght’s nether region a lick, making it extremely difficult to focus on her spells.

“Gyah!” Twilight’s head was swimming in sensual overload, and the worst part of it was, she wasn’t even into mares. But dammit Lotus was reeeeally good at this. But Twilight remembered why she was here, and focused on Pinkie Pie. She closed her eyes, doing her best to ignore the sexual assault she was being submitted to, and focused on her intestinal tract.

She found Pinkie, then focused on the lining of her intestinal fluids. Make them more pleasure oriented. Twilight wasn’t really sure how to do that, but at this point she could smell Lotus in front of her, and decided perhaps she could make it something like that. She focused on the mare’s fluid’s chemical make up, then thought of the sensations she and Pinkie should be experiencing, and added a standard amplifier algorithm to the spell. Once she had it right in her head, Twilight redrew her focus on her intestinal wall and cast the spell.

Shivers ran up and down her gut and suddenly she could feel the entire length of her digestive system without even thinking about it, and she could feel a solid—yet somehow, soft—lump right where Pinkie ought to be. Her friend was writhing around inside her intestines, even moreso than before, and it was turning Twilight on in a way she never would have thought possible. She threw her head back onto the pillow as her eyes rolled back in her head, and just lay there, letting the continuous ripples of pleasure penetrate through her whole body. She couldn’t even feel Lotus anymore.

After what had to be at least ten minutes of constant pleasure waves coursing through her whole body, Twilight finally felt something pressing up against her rump from the inside.

“Um, Lotus?”

“Mm?” Lotus lifted her head up and turned to look at Twilight. Her lips and chin were dripping with what could only be a mix of saliva and Twilight’s own personal juices.

“I think our time’s up.”

Lotus’s eyes widened, and she quickly hopped off of Twilight and onto the floor. “Oh, um. Right.” She quickly wiped off her lips, then checked the clock in the corner. “U-unfortunately that’s all I have time for. Aloe actually had to leave earlier. I’ll just leave you two to yourselves. If you’d like extended time, just leave the tag on the door so we know someone’s in here.” She opened the door slightly, peeked out, then left quickly and closed it behind her.

Due to her heightened senses, Twilight could feel Pinkie still squirming inside her butt. “Alright, Pinkie, hang on.”

Twilight stood up, and searched for a decent spot to… deposit Pinkie. The area near where her butt had been on the bed was completely soaked. Twilight wasn’t exactly sure how much of it was from her but judging by the smell, probably a lot. Lotus must have gotten quite the drink for her efforts. Twilight decided she’d rather not soil more of the blanket so she took a step forward and squatted down a bit over the offending spot on the sheets.

“Okay, here we go.” Twilight squeezed, as she normally would have, and was rewarded with a small ‘pop’ as Pinkie’s head slipped through her anus. Another side effect of having heightened sensory input was the feeling of something sliding in or out of her was even more pleasurable. Twilight let out a groan of ecstasy as Pinkie slid all the way out with a wet ‘plop’ and fell onto the bed.

“Welcome back, Pinkie.” Twilight called, turning around t greet her friend properly. “How was it?”

She found a completely dazed Pinkie Pie staring back at her through glazed eyes. She was twitching slightly, but was otherwise fine, owing to the ridiculous grin on her face.

“Me too, Pinkie,” Twilight chuckled. “Me too.”

Author's Notes:

If you're getting deja vu, yes, this is a reupload from my main account. This is an alt account and I'm going to move all my adult stuff over here. Stay tuned.