Do A Little Shake

by LilSlipsy

Rating: mature
Tags: Twilight Sparkle, Slice of Life, Porn, My Little Pony: Friendship is Magic, Princess Cadance, Romance, Sex
Length: 8812

Twilight learns about some knowledge that's forbidden from foals her age, and Cadance is more than ready to help them do some thorough research together.

Cadance is foalsitting while Twilight's parents and Shining Armor are away. The young Twilight Sparkle learns about some knowledge that's forbidden from foals her age and decides to do some more research on the subject.

As a great foalsitter and research assistant, she is more than ready to help do some thorough research together.

Tags: Foalcon, F/F, Mare, Filly, Lesbian, Nerds, Horngasm, Horn Penetration, 69, Cunnilingus, Masturbation, Mathurbation

Published 2024-08-22 18:10:00 UTC
Last updated 2024-08-22 18:10:00 UTC

Research

"Goodbye, Shining!" Cadance said before grabbing his tie, pulling the surprised teen closer to give him a peck on the lips.

His eyes went wide, and a red blush immediately filled his cheeks. Twilight gagged in the doorway, but both of his parents chuckled in the background as they loaded up a small cart. There was enough packed for them to be gone for a few days.

"Awww, my little colt's all grown up!" his mother said with a proud smirk once Cadance had pulled away.

His whole head turned red as a tomato as soon as she said that. "Mooom!" Shining Armor groaned as he went to get strapped in to pull the cart.

"But we do have to go. Don't want to miss the train to Manehatten for the big flugelhorn recital!" his mother said as they started to head off down the street. Twilight and Cadance waved them off, but eventually retreated back inside.

"Bleh!" Twilight gagged once more now that Cadance had stepped through the door.

"Oh, it was just a little kiss, Twi," Cadance teased as she headed down to the kitchen to see what was there. She had to get the foalsitter things out of the way first; making sure there was enough food and activities to keep them both fed and entertained.

"Yea! But he's my brother!" she said as she trotted along. "I didn't know that you kissing my brother in front of me would be part of the deal when we planned to make him your very special somepony!"

"And I'm glad you helped. Now I can kiss him all I want!" Cadance stuck out her tongue, and Twilight rolled her eyes in a huff. Cadance opened up the fridge with a wing. It would be more than enough to keep them both fed over for the weekend, and much longer if her parents ran super late on getting back. "Carrots?"

Twilight nodded happily, jumping up on a chair as Cadance floated some over on a plate for both of them to nibble on.

"So, I know the next few days are looking real nice outside. They said they weren't planning on having a cloud in the sky."

Twilight looked like she had seen a ghost. "And... we're going to stay perfectly inside reading? Instead of getting dragged outside or something like that? You... you wouldn't do that to me, right, Cadance?"

"Hehe, maybe not this weekend," Cadance said with a small giggle. "I actually have some studying to do too, so I'm right there with you on that."

"Oh, what were you studying?"

"Let's see." Cadance floated books out from her bag, reading the titles of them one by one. "Math... homework. Language studies... there's a test on Tuesday. Umm... some other stuff..." Cadance said as she skipped the red book in the middle and looked at the last one. "Oh, and history."

"Some other stuff?" Twilight asked suspiciously.

"Yes, this red one's just another class I'm needing to study." The books started to slowly float back as Cadance opened her bookbag again.

"Wait! Is that for your super secret class that both of you are taking? And no pony's telling me about?"

The other three books slid into the bag, but kept the red one in the air. "It might be. But it’s still a subject that's forbidden for foals to learn." Twilight's eyes twitched a little as soon as she heard the word forbidden. "You'll learn everything that's in this red book when you're older," she continued and slowly twirled the book around for Twilight to get a good long look at it. "You just need to wait."

"It can't be that forbidden if my brother is learning the same things as you!" Twilight huffed as the book slid in with the rest and the bookbag closed. Grabbing another carrot, she crunched down on it, failing to hide her indignance.

"But..." Cadance started with a cheerful smile. "What have you been working on since our last time together? Any new research?"

"Yes!" Twilight suddenly sprang from her chair. "Actually, I've been working on a little something!" Her sour expression was gone completely as she raced to her room and yelled from the other end of the house. "I've been so excited to show you!" The sounds of paper and tools smacking everything in their path could be heard until she came bursting into the living room and immediately got to work.

Posters were set up quickly onto their easels with practiced efficiency. Cadance sat down to just watch the filly, especially when she needed to reach up really high, or bend down low to pick up something from the ground. However, the graphs, charts, and other visual aids did warrant a quick peek at too.

Standing proud, Twilight motioned at the finished display of research that was far above her early grade school peers. "Tadaaa! I took your suggestion last time you came over to study. The long-haired ludere apes. I was able to find quite a few things interesting about them! They are actually quite similar to the koalas, except for their obvious long hair and prominent colours around their... lower regions," she said with a hesitant smile as she pointed at the vivid mosaic of blues, greens, and reds between the apes' legs.

"Wow, that's a lot different from ponies!" Cadance said with a small clap of her hooves. "The colours are spread out all over our fur and tails!"

"Precisely! And a lot of the research in the library actually pointed to some of those specific differences from ponies too, like how they have non-monogamous pairings. So, instead of just a mother and father, the entire group, or multiple groups, are just like one big family! They are even known to engage in same-sex pairings too, well... mostly the females, which make those pairings classified as either bisexual, or lesbian in some cases."

Cadance tilted her head at the last part, almost looking a little surprised. "Oh... where'd you learn about those two words?"

"You can look at the reference section on the back, or umm..." Twilight paused, a sheepish smile growing on her face. "Or I could tell you that it was from a pamphlet... you accidentally left behind... when you were over last."

"Oh, right!" Cadance said with a chuckle. "I was doing a school project on that. I was wondering where it went!"

"You're not mad or anything?"

"No, Twilight! I couldn't be mad at you for just reading through something. Really, it was my fault for leaving it around like that! But maybe let's not tell anyone what you found."

Twilight gasped suddenly. "Y-you mean... is this part of your super secret forbidden class?" Cadance nodded firmly, and Twilight gulped. "Oh... I understand. I won't tell anypony!"

Candance stood up and looked at her seriously.

"Ok! I swear it! I even take the foal school playground oath on it!" Twilight said, standing up for the pledge. "Sunshine, sunshine. Ladybugs awake. Clap your hooves and bake a cake. If I do lie and spill the beans, you can make me eat sardines!"

Cadance cheered, and Twilight quickly joined in, rumps bumping together in excitement, before giving each other a long hug. "Good. Now, what else did you find in your research? I'm sure you want to continue."

"Yes! We haven't even gotten to the pie charts yet!"

After a few more hours of comprehensive presentation, and some breaks to eat a mix of cookies, ice-cream, and a little salad, which was later dubbed dinsert, they ended up relaxing in the living room. Twilight was lying on the floor next to the slowly dying fireplace. She was reading through a stack of books that had been switching from the unread stack to the read stack with a steady pace.

Cadance, however, was finishing up some of the math homework with paper, a quill, and a trusty abacus in her magical grasp. Although she could have been finished a while ago, she took her time answering each problem. Being leaned up against the couch, and at a very specific angle behind Twilight, it was just enough to see some suggestive shadows under the filly's tail. The flickering candlelights still hid many of the more detailed features, but it was enough to catch the darkened purple of her fur there.

As much as she drug it out, the homework problems were completed, doubled, and even triple checked. With the evening getting later, it was about time to start heading to bed. Cadance gave a small yawn and a stretch as she stood. "Alright, Twilight. I'm heading off to bed now."

Twilight didn't respond or even move in the slightest. Her eyes were still darting across the pages in front of her.

Cadance smiled and started to pack up her bag, taking all but the red book. That one remained on the end table. A simple mistake that any sleepy pony could make. "Goodnight, Twilight," she said as she left the room.

A small smirk crept up on her face as she walked down the hallway and made her way to Shining's room. Cadance rolled her hips a little, feeling the growing frustrations from watching filly butt for a few hours. While she did have permission to sleep in their parent's room, it wasn't beside Twilight's like Shining's was. Plus, it was kind of funny knowing that hoofing it in his bed would get him all riled up when he got back.

Closing the door and landing in his bed was enough to just want to fall asleep right away, but there was more that needed to be done. Her ears were on full alert for any noise, but a hoof slowly slid down as the seconds passed. Gentle circles. It was enough to need to breathe deeper, but like many nights of babysitting before, she remained nearly silent.

Her hoof was damp, and steady ministrations were slowly starting to build towards a stealthy finish. However, a small creak from down the hallway put everything to a halt. Tiny hooves on the floor. Not the kind of a filly just going to bed, but one who was trying to sneak into their room without anyone hearing. But those floorboards were never merciful enough for that.

As soon as the door closed, Cadance checked the time on the abnormally large clock. Her hoof started moving again as numbers started to swirl in her head. With an approximate length of 72,000 words in that book, and Twilight's average reading speed of 875 words per minute, plus about a 10% bonus factor for focusing on a forbidden book. It would take her...

Cadance shivered and breathed a little harder than expected, with a sudden rise of tension in her loins. Her hoof dug in harder as she dove into some long division. It'd take about an hour and a quarter to finish the whole thing.

Out of the 14, chapter 5 was focusing heavily on the female anatomy... that wonderful female anatomy and those delicious flanks, and those. Cadance shook her head, needing to focus. It would take Twilight approximately...

She bit her lip as she continued, those equations having a hard time staying in her mind when purple cutiemarkless flanks kept springing up just as she was getting close to the answer. The jumbo-sized clock was ticking by, and precision was key, else the last pages Twilight would read would be more focused on the stallion anatomy of the next chapters. The fewer questions on that, the better.

With one last push, it was so close, yet still so far away. Masturbation and math were always a tricky balance, but sometimes a girl just needed the right tool to finish the job. She pulled out her abacus.

It was already well lubricated from earlier in the night, and flicking those beads into just the right spot was easy enough with her practiced hooves. She smirked as she started everything all over again and quickly realized how close she had previously been without any help.

Her hooves moved fast, until everything just came together in all the right ways. "26 minutes, 43 seconds," she whispered under her breath before biting her lips and pressing in hard between her legs. She clenched as a rewarding wave rushed through her, dampening her hoof enough until it started to soak into her tail and the sheets below.

Glancing over at Shining's big clock, she calculated exactly when Twilight closed the door and just how long it would take her to reach the end of chapter 5 after that. There were still several minutes left, and she was more than content laying there in her blissful afterglow, watching as the time ticked by.

Even though things were a bit too sensitive right now to push for more after that mathurbation session, her hoof still moved around in idle circles. It was enough to keep her awake until the countdown ended. She slowly slid out of bed in the last minute and got ready by the door. With fifteen seconds left, she took fifteen steps down the hallway and opened Twilight's door right on time.

At least, it was close to being on time.

Twilight was heavily focused on reading through the red book, flipping through the remaining pages of chapter 5.

A few seconds too early.

Cadance couldn't help but take another look at her favourite filly laying on the floor like that. Even though the room was dimly lit, she could catch a little sheen in the candlelight. Not much, but enough that you could see if you were really looking. Fortunately, she was.

Whether or not Twilight was aware of the dampness, Cadance couldn't really tell. Twilight really did get engrossed enough that she might not have even noticed anything yet. With a smirk, she stealthily stepped closer, her tail swishing slowly behind her, helping waft her needy scent all around the room. After a few seconds more, the page flipped again, right onto chapter 6.

Cadance’s horn lit up, and she slid the candle ever so slightly.

"Ahh!" Twilight shouted and slammed the book shut.

"Hey, Twilight," Cadance said with a sweetness to it. "Have you seen one of my textbooks? I might have left one lying around, and I can't seem to find it."

"Oh, hey! You know," Twilight said, looking at the borrowed goods in her hooves. "Funny story! That book that you said I couldn't read is here!" She stood up and nervously giggle-snorted. "Good thing that I found it for you!" She quickly passed it over like it was a hot potato. Her smile was shaky, like she was desperately trying to stay calm but was just on the edge of crying.

"Wonderful! I'm glad you found it!" Cadance said, floating it away; Twilight's sad eyes followed. "Don't stay up all night reading. You'll have all day tomorrow to do it," she finished as she blew the candle out.

Experimentation

It had been a few hours since Cadance woke up in the morning, but Twilight was still asleep in her room. It was later than normal for a weekend, but it was expected. There were sounds of a filly not going to bed last night for as long as Cadance had stayed awake. Usually she should have put a stop to it, but let it slide for one night.

A creak on the floor or a hushed whisper, Cadance could only imagine what Twilight had been doing on the other side of the wall. And imagine she did. Fanciful adventures of self-exploration on untouched lands, discovery of new pleasures, until reaching juicy rewards. The images played in her mind until her thoughts became delightfully vivid dreams.

As enticing as staying in that particular fantasy was, she did have to wake up eventually. Now she was busy studying through her language studies for the upcoming test. The rest of her books were stowed away in her bookbag.

Soon enough, she heard Twilight's door opening, but unlike the stealth of last night, the approaching hoofsteps were heavier, and a yawn echoed through the halls.

"Morning, sunshine!" Cadance greeted with a bright smile as Twilight turned the corner.

"Oh, is it morning already?" Twilight said with a tired grin.

"Yes! Quite a lot of morning so far!" Cadance giggled a little, as if laughing at her own joke. "The ladybugs have been awake for a while now!"

"What?"

Cadance started to sing and prance in front of Twilight before dropping down and doing a quick peekaboo. "Sunshine, sunshine! Ladybugs awake! Clap your hooves, and," she spun her rump around to wiggle at Twilight, "do a little shake!"

Twilight's head was tilted in confusion, but a smile quickly grew as the impromptu song finished. "Hehe, Cadance! That's just the foal school playground oath, but... different!"

"I know. I thought I'd... shake things up a little," she emphasized with the shaking of her rear and the occasional slip of her tail going just a little too far on either side.

Twilight's face suddenly looked a little red as she gulped from the unavoidable glance.

"You try it too!"

"Uhh... sure!" Twilight said as her eyes snapped back to Cadance's.

"Sunshine... sunshine," they both slowly sang as Twilight tried to copy Cadance's prancing as best as she could. "Ladybugs awake. Clap your hooves," they continued by clapping each other's hooves. "And... do a little shake!" Cadance’s rump shook boldly, but Twilight moved hesitantly.

"And do a little shake!" Cadance said again, putting even more effort into it and waving her tail around.

Twilight watched Cadance's rump and tried doing it better. It still needed some improvement, but it was enough that Cadance could see under the filly's tail clearly. There was a moment of silence until they noticed that both of them were staring under each other. Twilight's cheeks brought on even more of a blush than before as she nervously giggled and glanced away.

"So, ummm... breakfast?" Cadance suggested.

"Yes, please!" Twilight said with a lot more energy than she did earlier. "Do you think we can do something like last night? Desserfast instead of breakfast, maybe?"

"Haha, no." Cadance chuckled as they started walking to the kitchen. "I think you've had more than enough sweets last night."

"How about hay-ggs and haycon instead?"

Cadance nodded at that and started grabbing things to make the meal.

However, Twilight quickly ran from the room, but returned in a minute with a notebook, quill, and ink. She plopped herself down at the table and started writing on partially filled pages.

The pans were sizzling, the hay-ggs were frying, and the haycon was getting crispy. While she cooked, Cadance swished her tail back and forth like a song was in her head. Which... from the reflection of the metal salt shaker, she could see Twilight take notice and obviously look under Cadance's tail, only to put quill to paper right after.

Cadance wasn't entirely using the full heat to cook, letting it take as long as she could manage. But eventually, the food was ready to be served. Which might have been for the best; her dock was starting to get a little sore from all the wagging.

As soon as she headed over with the plates, Twilight's head snapped up quickly, and she turned the pages over. "T-thanks, Cadance!" she squeaked out as the food was placed down in front of her. Although it didn't take long for her to dive right into it.

Cadance ate much more casually, glancing over at the notebook, which was now on blank pages. With a subtle flick of magic, the pages turned until they landed on two drawings. By the cutiemark, she could tell it was her own rump, with all its explicit details sketched out on the page. And right next to it was a smaller, but much more detailed drawing of someone more filly sized; it must have taken a long while working on that last night.

"So, have you thought about your next project?"

"Mmmhmm," Twilight started to say, but choked a little when she saw what Cadance was looking at. "I... ack-... I..."

"If I didn't know any better, it looks like Miss. Sparkle already has her next research project in mind."

The blush on Twilight's face was fierce as she gulped down some juice. "Y-yes!" she finally blurted out. "Miss. Sparkle has her secret research project, and she can't... I mean... I can't show it to you!"

Cadance feigned a gasp. "What do you mean? I would love to see any of your projects."

"No fair!" Twilight snapped. She crossed her hooves and started pouting. "You and my brother get to have your super secret forbidden classes, and I don't!"

"I know, I know," Cadance said, trying to be as calming as she could. "It seems unfair that you won't get to learn new things until you're older. Hmm... or..." Cadance paused, enough that Twilight looked at her with curiosity. "Well, show me what you learned so far, and maybe I can help juuuust a little with it."

"R-really?" Twilight said in disbelief, but eagerly grabbed her notebook at the opportunity. "Ok, well... I maaaay have read through a few pages of your book you left behind last night, and I couldn't help but think about it all last night; pony anatomy and reproductive systems. Here's mine..." she said, pointing to the smaller drawing on the page. "And... well... you."

Cadance scooched her seat much closer to see, enough that their fur brushed against each other. On closer inspection, the small drawing was quite detailed and labelled in several spots. It was spread ever so slightly, enough that it revealed deeper inside; at least deep enough that it could have been done by candlelight.

"I had a mirror, so that helped a lot with sketching, but there's more internal structure that I can really reproduce yet," Twilight said with the same candidness as any other research project.

"And mine?"

"Y-yours?!" Twilight's eyes went wide. "Well, uh, I... I kind of just... watched you. Although I, uh... didn't have the same amount of time to do something more detailed. I'm sure if I can reference it a little longer, I can have something better... ahhh... I mean, if you wanted... no. That'd be... you... not... would..."

"Hehe, Twilight, it's fine!" Cadance said as she grabbed ahold of her before her brain had a full meltdown. "Whatever you need."

"It's fine? You'd be fine with that?"

"Mmhmm! It's not like anything's hidden walking around normally."

"R-right!"

"Besides, I could be your research assistant or something!" Cadance hugged a little tighter, but then let go. "Did you have any ideas on what to do next?"

Twilight smirked as she flipped pages. "I had a few ideas." It was a checklist. Not just one page, but it filled all the way to seven. "I haven't checked off the reorganization of the checklist step yet, but I put down a few things that might provide a bit more insight... at least after reading some of that book. While it did give some surface level definitions and qualitative information, it was distinctly lacking in quantitative data. Like... what's the median volumetric capacity of a vagina? Or how big is a clitoris supposed to be? Is mine statistically significant?"

She couldn't help but let out an exasperated sigh. There were probably a million more questions floating in the filly's head, far more than she could ever voice. "Does the book get better at the end?"

Cadance shook her head. "No. It's about the same throughout the whole thing."

"Ughhh..." she groaned before immediately starting to scribble on a fresh page.

Taking the opportunity to finish off her breakfast, Cadance did that while she watched Twilight make a few tables, notably with them ready to record details on only two ponies. Most of it seemed to be focused on sizes and other dimensions.

"What about taste?" Cadance said, only for Twilight to think on it for just a moment before writing it down. That thought alone made Cadance squirm in her seat, enough that she stood up to get the dishes cleaned up before Twilight saw her getting too excited. At least for now.

She came back to the other side of the table, leaning across to hide the growing dampness between her legs. "Orgasms?" she suggested. It wasn't really the easiest detail to put on a data table, but that would be a problem for later.

"What's that?" Twilight asked. "I didn't read that anywhere."

"Oh, you didn't get to that part?" An expected outcome. That part was only in chapter 8 and later. "Just forget I said anything."

Twilight looked at her with suspicion, but instead wrote out the word next to the rest .

Cadance couldn't help but feel her loins give a quick squeeze and wink out. It was hard to resist the temptation to go grab something far down under the sink and give Twilight even more things to add to her research, but she stayed firmly at the table.

Eventually, the brainstorming pace started to slow, and Twilight was spending more time thinking about what to put down than actually writing things down. Cadance looked over the pieces again. "What about depth?"

"Oh, I already have that one here." Twilight pointed to the exact spot Cadance was looking at. "Although that one's been a bit tricky. I was able to get the external measurements." Those spots were already filled on her tables. "But well... let me get it." She quickly jumped off her chair to run to her room and brought back a box filled with several tools; she pulled a metal ruler right from it.

"It was way too big to fit," she said, shaking the ruler until it made a wobbling sound. "And... it's pretty pokey, so..."

"So we might need something smaller then?" Cadance countered, and Twilight nodded along. "And maybe something with more forgiving edges. Tapered, so it could slide in easier." It was hard to hide the smirk as she rubbed up against it. "How about a horn?"

"That should fit!" Twilight cheered triumphantly before looking up at said horn. Her face suddenly flushed red. "But, uh, we don't-"

"Shhh." Cadance quickly brought a hoof to Twilight's lips before the filly started stammering even more. "So you're thinking it will work?" Twilight nodded. "We might be able to just make a mark on the horn and then measure that."

Twilight thought about it for a moment before reaching into her supplies and picking out a marker. "I think this would work; it says it's skin-safe and non-permanent."

"Alright! Then I think we can start collecting some data points," Cadance said with a little more seductiveness in her voice. She started to walk to the living room, wagging her tail back and forth, while Twilight followed behind. "And Twilight, you don't need to worry about touching or looking, I'm here to help as your research assistant, so feel free to-"

"Eeep!" Cadance squeaked out as she felt cool metal press across her slit.

"S-sorry!" Twilight jumped back with the ruler in her teeth; a small bit of wetness covering one end of it. "I just..."

"N-no, that's ok! It was just a little cold," Cadance said with a hesitant giggle. "How about... we warm up a little instead. Here, sit down. We can try to get those depth measurements first." Twilight sat, and Cadance laid down in front of her. "It'll be better if you get my horn a bit wetter before we go in, so just suck on it to start."

Twilight looked a little confused. "But... it's designed to naturally produce lubricant from a few glands. It should be fine."

"Yes, that's true, but what it doesn't tell you is that it might be better to add more lubrication to start with. Trust me on that."

The gears were turning in Twilight's head, before nodding along and staring at the horn that needed moistening.

"While you do that, I'll just lick between your legs. That should be more than enough!" Cadance said as her head moved down.

"W-wha-aaahh~" Twilight started to stammer, but Cadance was already too far, and her tongue quickly reached its target. "A-ahh~ t-that tickles!" Her small hooves gripped Cadance's head as the sudden sensations caught her off guard. She squirmed around, but Cadance gripped onto her tiny rump with her hooves.

"O-ok... t-that..." Twilight huffed out, finally having a few moments to think. "It's a little..."

"My horn, Twilight. Suck my horn."

"R-right!" The Twilight squeaked out before gulping. She bent down hesitantly, sticking her tongue out at Cadance's pink spiral. It was firm. Slowly, she wrapped her lips around it, gently going in deeper until it touched the top of her mouth. Like an unmelting popsicle, she gently started suckling on it.

Even with the simple touches, it was enough to send Cadance's eyes rolling back at the feelings; a delightful tingle that went right into her head and down through her spine. She squeezed her legs tight and rolled her hips side to side, rubbing just enough to add to the experience.

But none of that compared to actually enjoying Twilight. There was already a slight wetness when she started, but after some quick tending, it was a much different story. Her lips were starting to get puffier, and Twilight's natural taste was coming out heavily. She could feel each quiver of the filly's bits when she hit the right spots. As Twilight started to slow and as she felt that precious pearl wink out, she thought that this was more than enough prep.

"Whaaaa~" Twilight said in a slow moan as Cadance stopped and pulled back.

"Everything should be more than lubricated now, don't you think?" Cadance said with a smirk fully covered in filly juice.

"Y-yea~" she huffed out one last time before looking down to see the growing mess. "It's way more than I was able to do last night. I might need to add a few more things to the research, but umm... how... how does it taste?"

Cadance couldn't help but take it one step further and tackled Twilight, only to go right for a hearty smooch.

Twilight toppled over, and stayed frozen and wide-eyed on the floor as their lips held together. It wasn't until Cadance moved back that Twilight licked her lips. "Is... is that lavender?"

"Mmhmm," Cadance said with a sly smirk. "Pretty delicious, right?"

"Your... you... my... on my... ah... ahhh!" she stammered before licking her own lips again and going into a heavy blush. But the notebook beside her also caught her eye and gave her something normal to focus on. "S-so... we got taste for me done," she said as she wiggled over enough to write the findings down and mark the spot off on the checklist. "Should we... get yours too?" She glanced back over to Cadance's dripping horn with a mix of emotions on her face. "Or... we could finish that part of the research."

Cadance let out a small chuckle, wondering if she overdid it or not, but besides the temporary short circuiting, it looked like she was fine. "Here, let me help you up," she said, but Twilight's legs shook as soon as she stood and would have tumbled over if Cadance hadn't caught her. "Whoa... ok, let's get you on the couch for the next part."

Twilight laid on the couch with her legs dangling off the end. If she stood on the tips of her hooves, they could barely touch the ground. Her tail was instinctively raised, but as she looked back, it slowly moved to the side, revealing the small, aroused mound underneath. "L-like this?"

"That's perfect, Twi!" Cadance licked her lips as she got closer. Her muzzle had already been there, but it was enticing to just try again and again. With enough willpower, she angled her horn down instead, watching very carefully as it got near. The thin and rounded tip gently pressed against her delicate opening, parting it ever so slightly as it found its target. Cautiously rocking forward, it started to dip in more and more.

A sharp inhale from Twilight sounded like she was certainly feeling this.

Cadance moved the angle of her horn around, sliding when it felt like there was less resistance. Twilight's tunnel tightly squeezed, only letting up in short bursts. She could have tried to tell her to relax a bit more, but each clench was like an intimate massage on her brain. It lit up and down her spine all the way to her own marehood. The mouth was nice, but nothing like this.

"Y-you're doing great, Twi," Cadance said with a little waiver in her voice. It took a lot of resolve to not just bury herself all the way, but it was good that she didn't. She pressed in a little more but felt firm resistance. Even if there was a considerable amount of horn left out, it was as far in as it was going to go.

Twilight tensed and grunted out as it pressed against her cervix, though she quickly started looking from side to side. "Oh... we... we forgot to grab the marker!"

Cadance looked down as much as she could without moving her head. All the supplies were spread out in the middle of the room. "Here, let me try something." Magic started flowing from her horn, reaching out to try and grab everything.

"Oooo~ that's warm, and... s-so ticklish!" Twilight squealed, crossing her legs as well as she could with another pony deep inside her.

It was like trying to grab something from another room, and with the restless filly squirming on her horn, it was very hard to concentrate. It was almost a miracle that the magical glow started to envelope the items. She focused intensely on floating them all over, putting more magic into her horn, and getting the filly to bury her head into a nearby pillow to yell.

Soon enough, they had everything floated over to the couch, and Twilight picked her head up a few moments after the magical rod inside her turned off. "You..." she started to say, but paused a little more to recover. "You know, you could have just walked over there."

"I could have, but where's the fun in that?"

Twilight gave a huff in annoyance, but the unmistakable smile that she tried to hide gave everything away.

She totally liked it.

The cap of the marker popped off as Twilight grabbed it, and she blindly made a mark on Cadance's horn where it felt appropriate. She put the cap back on and wiggled forward until the horn was out of her. With a quick check on the ruler, she jotted down the measurements in their assigned column, as well as a few additional notes on sensations she marked down on the side, and marked another item off the checklist.

"How'd that feel?" Cadance asked after she stopped writing.

Twilight put down the quill and looked over her words. "It was weird. It felt like it was just kind of... there, but the insertion into the vagina felt nice. Like a massage? Although, when it touched my cervix, that... was a little uncomfortable." She stared at the pages, but it looked more like she was replaying everything in her mind until her eyes suddenly lit up.

"But that magic!" Twilight continued. "Wow... that was something. I don't know how we're going to measure that. Pleasure? Can we measure pleasure? Is there a formula we could use? I'll just rank it at the top for now, but that was the best thing, like... ok, when my magic finally works, I swear I'll let you try that! It was-" The enormous smile on Cadance's face was enough for Twilight to suddenly pause.

"I look forward to it," Cadance said in a sly tone. A blush erupted again on Twilight's face, but there was also a small grin that showed itself. "In the meantime, I guess we can make due with what we have right now."

"Do... you want to suck on my horn too?"

"Yes..." Cadance said with a mischievous chuckle. "But I think we can skip that and go right to the next measurements. I'm more than lubricated." She thought about turning around and showing her exactly how wet it was, but as much as her winking clit desperately wanted to, she still wanted to take things with some sort of restraint.

"Please?"

"Oh...?" Cadance paused, getting caught off guard by the question. "Oh! Sure!" She looked at Twilight again, and her eyes had their usual curiosity, but there was a spark of something else there. Was it just initiative for thorough research, or was it for something more? Either way, Cadance stood up fully to give the foal what she wanted.

Twilight bowed her head down as Cadance approached, staring down at the couch.

Neither said a word.

She put a hoof on the back of Twilight's head, gently pulling her in as her lips kissed the tip. She could feel Twilight stiffen up, but Cadance still held on tightly to keep her horn still. It wasn't much to fit the entire filly's horn in. She gave it a strong suck as she pulled back up, making it more than wet. It sent a deep shiver through Twilight.

Cadance could hear those breaths getting heavier and wavering the longer this went on. Curious, though, was that her horn was mostly tasteless, except for a slight tingle on the tongue from the idle magic within. If Cadance wasn't busy, it might have been something new to note down.

"Mmmm~" Cadance let out after really getting into this. Slurping from base to tip again and again, it was reminding her of a similar activity with Shining; but thankfully, he won considerably in the size department compared to a foal's horn. She giggled in her head, wondering how Shining would have reacted to her comparing the two. She gave it a slow lick all the way along its length again, swirling around right on the rounded point at the top.

"Ahh~ Ahh~" Twilight started to breathe out, until. "Oops!"

Looking down, she could see the notebook right between Twilight's lap. Notes on the side were progressively getting messier, until a long stroke of ink looked to have accidentally been swiped across the page. A sheepish smile crossed her face when she looked up.

As much as Cadance should have been surprised, she wasn't at all. She chuckled and shook her head softly. "I think we could move on to the next part." Stepping back to the middle of the room, she flicked her tail to the side, revealing her winking sex. "You ready?"

"I..." Twilight started, but it looked like her brain was starting to spin, at least until they caught each other's eyes. Cadance gave a small nod, and Twilight resolved herself before firmly nodding back. "I'm ready." Sweeping up the notebook and other essentials, she trotted off the couch and headed over.

Cadance bit her lip a little and closed her eyes when the anticipation between her legs was building close to unbearable. The carnal need that followed wasn't this bad since her first heat, but at least she knew exactly where she was going to get some relief. "I'm going to help get every single one of those data points filled out for you," she mused, widening her stance and waiting for that small tip to show itself in the middle. "So go ahead and take all the thorough measurements you-"

"Ahh~!" Cadance gasped out as she felt a pair of lips land right against her clit. Although, instead of the filly jumping away, those lips stayed and her tongue pressed against her. She winked out hard. Her back arched and her hips went back, but almost as quick as it started, the filly pulled away.

"Twilight!" Cadance snapped in frustration and spun around, shocking the filly.

"S-sorry, I-" Twilight said as she went to wipe her dripping muzzle off with a hoof.

"Don't you dare take away my opportunity to taste myself on you!" Before Twilight could really react, Cadance swept in and planted another deep kiss on Twilight's lips. They were soft as usual, with a hint of lavender on them, but heavily mixed in was the taste of her own marehood; that being on Twilight's stunned face made it all the sweeter.

"How does it taste?" Cadance said with a smirk as she turned back around to present herself once more. Her tail curled around the back of Twilight's head, hugging her closer with it.

"It..." Twilight stammered right as she stared directly at the source. "I... don't actually know. It kind of tastes like the way I feel right now."

"Horny?"

"Uhh...?"

"Like you just want to keep doing this over and over again until you can't stand up anymore?"

"Y-yea... like that." She moved to go write down something in the notebook, but the tail stopped her.

"Twilight," Cadance said with a bit more urgency in her usually kind voice. As much as she loved the data collection...

"I need you to put your horn in me right now."

"S-sure... for the measurements..." Twilight spoke softly as her head dipped down, and slowly pressed closer to its mark. Carefully, it searched around for the correct spots, but Cadance did help guide her a little with her tail until it found its mark. It slid in with a similar cautiousness as Cadance had done to her. But as the horn was halfway in, Cadance pushed her rump back for the rest. Both of them huffed hard with it buried as far as it could go.

Cadance's eyes rolled back at the feelings; it was like finally getting a satisfying bite after being hungry for so long. Although she couldn't help but glance back and notice the marker hadn't moved at all. Slowly, she retreated, only to press back again.

The measurements could wait for now.

She could feel Twilight's weight shift, leaning forward into her rump a little each time she pushed. The filly's legs were locked, so hopefully it was enough to keep her upright for as long as possible. "Mmm..." Cadance sounded out in delight as she kept going. The horn itself wasn't big, but the forbidden intimacy and faint magic within were enough to hit the right spots in their own special way.

"A-ahh... ahh... ahh..." She could hear Twilight from behind her as the rhythm picked up. Cadance hadn't really practiced horn penetration that much, but she had heard the most intensely pleasured vocalizations from the foal so far, so she might be doing a few things correctly.

The filly's head twitched and squirmed, but Cadance pressed her tail in more to keep her there for as long as she could. From today, she knew the difference between mouth verses between a mare's folds were on whole different levels; an appetiser to the main course that she was going to serve plenty of.

"T-the marker..." Twilight spoke up, but didn't move a muscle towards it.

"Well... uhnnn~... it's all of your horn. I don't think we really need it now. Don't you agree?"

"Mmmmm~" Twilight moaned deeply in response.

That sounded like the right answer, but there was one more thing that she was thinking of adding. With a bit of focus, her horn lit up again, and a magic field felt around Twilight's rump until she located one particular spot. It pressed hard against her magical touch, only to wink out strongly when it gripped her clit.

"A-ahh~! C-Cad-ahh~!" Twilight squeaked out as the magic gently massaged that small dot. With that spot being so sensitive, she was probably feeling the magical tingle and vibrations even more than normal.

Cadance was feeling herself starting to get closer to that satisfying finish, but her focus was still divided primarily on Twilight. With her magic, she could feel every quiver and tightening of the filly's nethers. It was getting faster and more urgent too.

One of Twilight's back legs stomped the ground hard as her moaning and unsuccessful attempts at speaking turned into one long chorus of pleasured sounds. She was taking all that Cadance was giving her until she squealed out one last time. A long pause followed as her entire body tensed.

Cadance could feel Twilight's entire fillyhood tighten and a few strong pulses of wetness gliding past the edge of her magic. But Cadance's eyes also widened as she felt the horn inside her heating up, and a wave of warmth erupted through her tunnel. The spurts from Twilight's horn and sex matched, as Cadance felt herself filling with a hot, tingly burst of magical sauce.

She pressed back into Twilight's head as much as she could, so close to getting there again, but she felt the horn suddenly slip as Twilight's legs finally buckled. She was close, so very close!

Cadance desperately looked back and saw that Twilight's horn was still sticking up. She could do it; just sit herself down like the great foalsitter she was and ride it to completion, even if Twilight might be more than a little overstimulated. It was tempting, but she couldn't do that to Twilight... at least not yet.

She took a deep breath to calm down, reminding herself that there was still much of the day left for more fun.

"Huughabuugaa..." Twilight mumbled as she struggled to lift her head up. "W-what... what was..."

"An orgasm," Cadance answered, gently petting Twilight's mane.

The top of it was completely soaked, with a mix of glittery goo from the horngasm. Sweat and marejuice ran down the sides of her cheeks as she met Cadance's eyes. "He... hehe... hehe..." she exhaustively giggled, but she looked more like she was having a hard time waking after a long nap. Cadance let the filly rest her head in her lap as she petted her for a few minutes longer.

With great effort, Twilight roused and crawled over to the notebook. She shook herself awake a little more as she reached for the quill, putting a deep checkmark right under the orgasm column for Twilight. She rolled over on her back to rest for a few moments, her legs spread wide to cool down.

Those filly folds were absolutely drenched, and like her mane, her tail was sticky with copious amounts of love juices soaking through to the floor. The adorably debaucherous scene warmed Cadance's heart, but the begging in her other parts had her tail flicking with some force behind her.

"I guess... it's your turn to orgasm too?" Twilight said as she tenderly rubbed her horn.

Cadance’s rear leg lifted over Twilight's head as she lowered herself down to straddle the filly's chest. Her tail was lifted high, but the ends of it still brushed against Twilight's head. "I think that would be a great idea." Her voice held all the pent-up tension that had accumulated since they started this at breakfast.

Looking down at the delightful slit below her, Cadance licked her lips. "Now... you can just dive into it and explore with your tongue. I'm sure you're now aware that the winking clit on the bottom is what really feels good." Her whole body tense a little as she felt a particularly hard wink flash out right on cue. "That... that's where you want to go for. You can just follow my lead. What's feels good on you will feel good on-"

"M-eeep!" Cadance squeaked out again, and she felt cool metal pressing against her slit.

Her head snapped back as she saw Twilight lining up the ruler with her hooves, before making a few notes on the notebook. Cadance rolled her eyes and pressed back, pushing her rump far enough until the ruler clattered to the ground. Twilight tried to speak up, but her muzzle squeezed between Cadance's folds, and the complaints quickly turned into annoyed muffles.

She grinded herself all over that filly's muzzle until she finally felt a tongue poke out and give a few tentative licks. "That's it, Twi... just keep doing that…" she purred.

Cadance brushed her mane to one side of her head as she went down to tend those puffed-up filly lips. Her tongue ran from top to bottom, and a muffled moan squeaked out from underneath her. She probably had enough of a break for another orgasm; second today and probably second in the entire filly's life.

That thought was almost as delightful as the small tongue eagerly lapping wherever she could, going at it like it was an ice cream rapidly melting from the scorching heat. Cadance teased around Twilight's clit, and she felt her shiver deeply, but Twilight's tongue quickly copied the motions.

"Mmmm... t-that's good," Cadance panted out, feeling herself getting closer and closer, finally getting the rewards she needed so badly. Her hips rocked reflexively, getting lost in the pleasures that came with each lick. Twilight used that to take a quick gasp of air, but she dove right back in with renewed fervour.

Twilight was such a good study. Whenever Cadance found a spot that sent Twilight squirming or sucked on somewhere that made her moan out deeply, Twilight matched it. She was really getting close now, just on the edge, ready to be pushed through at any moment. But as she dug into the filly more, she could feel those small hindlegs clamp around her head, desperately squeezing in an all-too-familiar way.

Twilight was close again too.

As much as it pained her to take her lips off, Cadance cried out, "Y-you're there, Twi, just do it... it a little.. m-more!"

"Ahhh~!" Cadance squealed out from all the built-up delight reaching its maximum point. She pressed back hard into the filly's small muzzle until it dipped in, and her own flood of juices was let loose, soaking Twilight in all the liquid love that came out. It was like she was flying higher than she had ever flown before; she felt practically lighter than air in that euphoric state.

"Oh... t-that.. that was good," Cadance panted out hard as she slowly came down. Shining was going to have some strong completion.

But as she came back down from that high, she felt those legs squirming for more around her head. She immediately put her lips on Twilight's urgently winking clit to give it the satisfaction it needed too.

Twilight's own chorus was being sung once more, and even louder now that she only had to focus on her second orgasm, which was fast approaching. Her body could only squirm so far with the alicorn on top of her, but as everything quickly built back up, she tried sticking her hips in the air as far as she could manage.

Cadance eagerly pushed right back, until she sucked right on that sensitive dot and stayed there right until the end. Her head was tightly squeezed again by those hindlegs, until a final ripple and rigidity overcame them.

"C-Cadance!" Twilight nearly screamed as she went over the orgasmic edge.

She could feel the filly's tunnel with the top of her muzzle and how it tried to internally grasp around something that wasn't there. But suddenly, there was a wet spray shooting out. It wasn't as powerful as the first round, but it was a delight to be squished against the source of delicious juices when they went off.

Twilight's hindlegs started to relax until they just hit the floor with a thud; the sounds of her forelegs did the same.

Cadance stood and watched as Twilight just revelled in that sweet afterglow. She expected her to be down for a while after two solid orgasms, but Twilight managed to will herself up on her shaky legs.

With a tired giggle, they both smiled at each other, but Twilight didn't hold it for long as she glanced at the notebook. She spun around and reached for the quill to check off a few boxes and make the notes that were still fresh in her mind.

"How was that?" Cadance asked her perfect little researcher.

Twilight blushed, but a noticeable smirk crossed her face. "I think we need to do some more thorough research," she said as she pointed her rump at Cadance and did a little shake.

Author's Note

After researching on Cadance and filly Twilight, I thought of making this story. It seemed fun, so I hope you liked it too. Let me know with a like and a comment below if you did!