Senior Year Ponies Up

"So that's basically the story," Sunset said, blushing heavily. It was the day after she'd fucked Rarity in the bathroom. All of the girls shared an elective as the Rainbooms, practicing their music alone in the band room right after lunch. Today, she'd taken the opportunity to fill them in on her new transformation, though without saying she'd already inseminated two of their number, and fully intended to pound Rarity again as soon as requested.

"Wowee," Pinkie said. "And it comes out when you get hot?"

"I dunno," Sunset said. "It did yesterday, but it's such a new thing, it's always sort of hot knowing I can do it whenever I like," she blushed harder, "and it hasn't happened yet today. I don't know if I'm getting it more under control, or what."

"It can't be a coincidence that you all sometimes grow pony ears and tails and now you, uh...get the other thing more often than you should," Twilight said. "It's got to be a manifestation or interaction of the magic you all draw on, be that terrestrial or residual Equestrian power from when the Element was here. And who knows if the potions are exacerbating the effect? You should come to my place right after school. We'll see what my magic detecting machines can do. I've got a new version of the Passive Etheric Field Fluctuation Detector. It's bluetooth!"

"I don't know what that means," Sunset said. "But I guess we do need to see what we can find out about the magic and why it's spontaneously reappearing."

"Exactly," Twilight said. "Sure, right now it's harmless, but who knows if that will change? Or if other things will start happening? And imagine how inconvenient it'd be if it happened in class! We need to get to the bottom of it, at least to make sure it's safe."

Inwardly Sunset didn't like the idea. The rigors of the scientific environment seemed unlikely to produce a spontaneous boner at all, and if it did appear, sitting around frustrated for the no doubt hours it would take to study it sounded like torture. Still, Twilight was right. Enjoyable though pumping Rarity full with the unexpected member had been, she was a bit concerned about the magic not working as expected. And if the potion was having any kind of effects like that, it'd be important to know about it now, before using it any more. So she agreed, and made plans to meet Twilight in the locker room after school, since both decided having some of the potion on hand to study might be useful.

None of her other friends had much to say to the revelation. Fluttershy just blushed furiously. Rarity began sketches on modified panties that might be able to better deal with any unexpected horse cock manifestation, both in terms of concealment and comfort, though there was of course only so much she could do. Rainbow Dash joked, as was her way, and Pinkie just grinned. Applejack was quiet, which worried Sunset, but when she asked, Applejack smiled at her and said it was fine, just weird.

Disappointed though she was in what that seemed to indicate about her chances of living out her Apple-related fantasies, it did put Sunset's mind at ease. So the girls went to their other classes on good terms.

The rest of the day passed uneventfully, with one exception. Right before last period, Sunset noticed her water bottle missing from her bag. Unfortunately, after a frantic search through the last few places she'd been, she found no sign of it. She hadn't taken it out all day, so hoped she'd just left it at home, but one way or another, it seemed to be out of her hands until she got back that evening.

So with nothing else to be done, she finished up last period, then went to meet Twilight in the locker room. She opened her locker and the crate, and Twilight pulled out a vial with great excitement.

"Oh, wow, look at that text! It's really not like anything on Earth! But I can totally tell it's writing. You said the yellow was without the contraceptive and the blue was with?"

Sunset nodded.

"I guess that makes sense, if we're all so similar we have analogues, it's not surprising we have similar color coding, yellow for caution, and blue is calming. Good mnemonic." Twilight took five of the blue potions and two of the yellow. "It looks like you have plenty of these of both kinds, you don't mind if I take this many, right?"

Sunset shook her head. "I can always get more if I need to. But why do you want so many?"

"I'll want to do several tests on the base formula, and might use a lot. And it'd be interesting to compare the other. It seems unlikely the contraceptive is just a biological agent, since the spontaneous generation of a penis is clearly magical, so I'm interested in how much my instruments can tell me about the difference. It might help me make them even better!"

Sunset shook her head, but grinned. "Sure, then, that's fine. Ready to go?"

Sunset still new relatively little about the Princess's human equivalent. Though she'd fit well, if awkwardly, in with their group of friends, they'd never really hung out after school. At least, not one-on-one. As a result, Sunset had never been to Twilight's house. It was smaller than she expected, and it also turned out both of her parents worked. Neither would be home for hours. Where Equestrian Twilight's parents were middle-class intellectuals, this Twilight turned out to be solidly working class, and, as far as Sunset could tell, significantly if benignly neglected. She felt it explained something about her...keenness, for lack of a better word, compared to her Equestrian counterpart.

It did make her wonder where the money for all the stuff in her basement lab came from, once she saw it, but she decided this might be a question for another time. The walls were covered with vials, books, and boxes of equipment. In the middle of the room was a work bench with a laptop on it and several truly esoteric looking devices.

"Wait here," Twilight said, and hurried off through a door. Before Sunset could think about disobeying, she came back in, struggling to push what looked like it was supposed to stand in for a hospital bed: a homemade wheeled frame carrying a narrow futon mattress.

"Wow," Sunset said. "What do you think we'll need that for?"

"I don't think we will," Twilight shrugged, "but you never know. It always pays to be prepared! But let's see what Ethyl 2 has to say."

"Ethyl 2?"

"Passive Etheric Field Fluctuation Detector Version 2 doesn't acronym very well. Anyway," she pulled a device from the table that looked, to Sunset, like a modified egg beater. "Remember when I scanned you all at school? I recorded all of your levels of magical energy both normally and during times when you 'pony up'. I'm interested to see if this changes anything." She opened the laptop and pressed a few buttons, and two lines appeared on the screen, looking very much like sine waves. One was blue and one red, and the red one was both higher on the screen and had a more significant amplitude than the blue.

"The blue is normal, the red is when you 'pony up'. As far as I can detect, when you do, your overall magical energy increases, and it also becomes more agitated." Twilight ran Ethyl the egg-beater-device slowly around Sunset at waist level. It emitted a strange whirring noise, and a green line crept across the screen, superimposed over the blue one.

"Okay," Twilight said, "your passive magical field is the same as ever. That's good. Or at least, makes it less likely the potion has had major effects outside the time the dick manifests. Have you noticed any physical changes besides the intermittent horse penis?"

Sunset laughed. "Certainly none as obvious. What do you mean?"

"The penis is clearly connected at least by nerves, since you can, um, masturbate it successfully," Twilight blushed a little. "If it's also connected to the endocrine system, it could be providing you with male sex hormones, or even equine hormones. That might have any number of effects from shrinking breasts to growth of muscle or hair."

"I haven't noticed any of that, no, but it's only been a few days."

"That's okay, fortunately we can check! Take off your clothes."

Sunset blinked. Twilight's voice said business, but she was blushing just a little, her cheeks shaded a darker purple.

"Excuse me?" Sunset said.

"Oh, um, I just meant I could measure it! I have your medical records, I can measure your bust and major muscles and compare."

"How did you get my medical records?"

"The Nurse Redheart has shameful cyber-security. It's okay if you don't want to I guess, but it'd be useful to know."

Sunset didn't exactly want to, primarily because she was concerned she'd get aroused and get an embarrassing erection. But though she loved her magical pony penis, she also liked her human young woman's body, and if she were disrupting it with strange hormones, she did want to know.

"No, it's okay," she finally said. "You're right, this is important to know."

Twilight watched the computer screen politely while Sunset stripped. She undid her skirt and let it fall to the floor, then her panties, then she pulled off her top and freed her breasts from her bra. Several times throughout the process, she thought she saw Twilight sneaking a peek, but couldn't be sure.

Sunset was particularly proud of her breasts. They were the most novel thing about her human body, of course, but she also thought they were one of her best features: not tiny by any means, but not so large as to be unwieldy in sports or saggy outside her bra. Quite the contrary, she found them shockingly and pleasantly firm even unaided. The medical feel of the lab, plus the slight chill in the air thankfully prevented her from becoming too turned on by stripping, though the chill air did make her nipples hard. Still, it could have been worse.

"Alright," Twilight said, pulling a tailor's measuring tape from the desk drawer, "ready?"

Sunset nodded and swallowed. Twilight measured her arms in several places, and her stomach and hips. She leaned down and gazed at her crotch, though not between her legs, before nodding. She looked too at her upper lip, and Sunset had to resist running a finger over it to check for errant hairs. Finally she put the tailor's measure around Sunset's bust, measuring it just below the nipples. Despite herself, Sunset shivered at the feeling of the chilly tape and Twilight's warm fingers just inches from her erect nipples.

"Sorry," Twilight blushed, but thankfully Sunset's crotch remained entirely feminine.

Twilight returned to the computer, leaving Sunset to stand awkwardly naked while she typed.

"You can lie down if you'd rather," she said over her shoulder. For some reason it did sound slightly less awkward, so Sunset did.

"Okay, good news," Twilight finally said, "if you're getting any weird hormones, they haven't done anything yet. As far as I can tell, there are no lingering effects of the potion."

"Other than that time it made me spontaneously gain a dick."

"Well, yes," Twilight blushed again, "other than that. Speaking of which, now I need to study it. So we need to see what makes it appear."

"Wait...really?"

"Of course. How can we see what changes when you have it unless it shows up?"

"But...I told you it makes me..."

"Very horny, I know. I'm sorry, but if you want to figure this out you'll just have to deal with it for a bit. It won't take long, and then you can take care of it."

Sunset sighed. "Fine. What's the plan?"

"I want to see how specific the stimulus needs to be. I talked to Rarity and she told me, ah, quite a bit. You were thinking of her when it appeared yesterday, right?"

Sunset's face was now burning up. "R-right."

"Okay, so I'm going to try to create escalating trigger conditions to see what causes it to appear. If all else fails we'll just have you take a potion, but obviously a repeat of the spontaneous event would be better." She walked over and placed Ethyl 2 on the bed next to Sunset. "We'll also measure your magic to see if it increases when the dick appears."

She turned the laptop screen towards Sunset. On it, a video was playing, featuring a woman on her knees, rear in the air and slightly spread.

"Are you showing me porn?" Sunset nearly laughed.

"It seemed the least direct way to try to arouse you," Twilight muttered.

She let the video play for a few minutes, but when Sunset showed no effect, other than a brief giggle, she turned it off.

"Okay, let's see if the connection to one of your friends is important, then."

She pressed a few buttons on the laptop, and the magical energy graph appeared in a small window in the bottom of the screen. Then she brought up another video in the main window.

"Rarity?!" Sunset was aghast.

Indeed, on the screen was Rarity, with a faint smile, standing in the locker room.

"We had a free period together," Twilight said. "She told me all about yesterday, and agreed to do a brief video once I explained the project."

"She's way kinkier than she seems," Sunset muttered.

Twilight ignored her and started the video.

"Hello Sunset darling," Rarity said from the laptop's speakers, "Twilight asked me to help make a video to help with her experiment," she grinned, and took off her jacket, revealing a low cut top. "Naturally, with how much I enjoyed our time yesterday, I couldn't refuse." She pressed her arms together, creating a really unfair view of her cleavage. Sunset's nipples hardened. "I must tell you darling, I've been thinking of that wonderful cock of yours all day." On the screen, Rarity pulled off her top. Her generous breasts were held back only by a pearly white lace bra, which she quickly took off. Sunset had never seen them freed before, but it was worth the wait. Larger than Sunset's own, they were nonetheless firm, and her nipples were hard and dark on the surprisingly small aureola. She began running her hands over them. Out of the corner of her eye, Sunset saw Twilight bite her lip.

"Oh yes," Rarity went on, "why, the only reason I haven't jumped you yet is that I want to do it right." The camera pulled back, and Rarity turned around, slowly raising her skirt over her matching white thong panties. "I want you to myself for a whole night. I want to fall asleep together all tangled up, exhausted from our indiscretions." She pulled down the panties and bent over more, then spread her sex with her fingers. Sunset was soaking, and was sure Twilight could smell her musk on the air. Still, no dick emerged. The video cut off.

"Well," Twilight said, her face nearly Imperial purple, "only one more thing to try. My hypothesis was that the physical presence of the one you were thinking of was important, and that's why it appeared only when you were in class with the girl you were thinking about."

"Wait, did you bring Rarity here or something?"

Twilight shook her head, and began unbuttoning her vest.

"Wait, you're going to--" Sunset cut off as Twilight glared at her, clearly already embarrassed.

Twilight shrugged off the vest and placed it on the work bench. Then she carefully undid her tie, doing the same. Sunset had never realized how many buttons were on the girl's outfit! She began on the next set, those on her sky blue undershirt. Every one she undid, a little more of the flesh beneath became visible, and Sunset found herself straining to see the unintentionally slow striptease. Twilight clearly never went to the beach - she was slightly paler lavender under the shirt. Finally she undid the last button. Sunset also hadn't noticed how skinny the girl was; she didn't seem unhealthy, but her stomach was even flatter than Fluttershy's, and it didn't look like her simple white bra held back much more in the way of breasts, either.

This impression soon proved correct. Twilight, her blush spreading to her neck and shoulders, carefully lay aside the shirt and reached back to unhook her bra. Her breasts fell free. They each looked right about a handful, and Sunset found herself quite keen to test that observation. As she watched, Twilight's nipples hardened and grew until they were substantially larger than Fluttershy's or Rarity's, and Sunset thought they looked fun to play with.

Twilight reached down and unbuckled her skirt. Again rather than letting it fall to the floor, she carefully placed it on the table. Her panties were also a simple, functional white, and she began removing them carefully too, but it seemed like something went wrong, and they slipped from her fingers and fell to the floor.

"Oops," she said, and turn around before bending over to pick them up.

Sunset wondered if she just really liked human butts, or if all her friends really did have fantastic ones. Twilight's was on the small side, but firm and tight, and she could imagine pressing her cock between the cheeks. As Twilight bent her pussy peaked out between her skinny thighs, and Sunset could definitely imagine pressing between them, her cock sinking into Twilight's body, the other girl's gasp as the shaft pressed into her...

The laptop let out an alarmed beep, and Sunset's mind again filled with the fog of lust as her pony prick appeared with a glimmer of red magic, just like her ears. Twilight shot to her feet, panties forgotten, and went to look at the screen. Absurdly, the magical line had formed a shape looking very much like a dick and balls before settling in to the normal "pony up" pattern.

"It worked!" Twilight nearly yelled, and began rummaging in drawers.

The next what felt like half an hour was a peculiar form of torture for Sunset. Twilight rushed about shamelessly, breasts and ass jiggling tantalizingly as she gathered supplies and measured every dimension of Sunset's cock, as well as taking numerous photos and running Ethyl 2 all around it, as well as several other devices. At first the only indication she remembered she was herself stark naked was her blush, but as the measurements went on, she began stroking her nipples and pussy with her off hand. Sunset wasn't even sure she knew she was doing it, but she didn't trust herself to speak with how aroused she was. Besides, the longer Twilight's measurements took, the longer before she could ask which beaker Twilight wanted to collect her cum in and relieve her throbbing cock.

Finally Twilight went and entered all the data in the laptop. Sunset was about to ask her if she was done, when Twilight picked up a tiny tape recorder, the kind Sunset had only seen in old movies, and began moving some papers aside. Sunset's curiosity was finally too much.

"What's the recorder for?"

"I don't expect to be able to take detailed notes once you're inside me, so I'm going to have to dictate them."

"Wait, you want me inside you? I figured you'd want to collect the cum in a beaker or something."

Twilight spread her legs slightly apart and placed a large glass bowl beneath her crotch, then lay down on the part of the desk she'd just cleared, revealing her slightly parted, glistening pussy lips and her glorious ass.

"I'll get it on the way out. Rarity told me that your unusual penis sealed her off and forced your semen past her cervix, leading to a visible bulge," she stretched the tailor's tape around her flat stomach and noted the number in the laptop. "By measuring the effect I hope I can figure out how much entered the womb and how much remained in the vaginal canal."

"Why is that useful?"

"Why would I only want to know something if it's useful? And it's a totally unique penis on this planet! It's similar to a horse's but not identical, size aside. I can compare how it feels."

"Wait, you know how a human penis feels inside you?"

"Well, not a real one, but I've experienced a wide variety of very accurate models."

Sunset rolled her eyes.

"Fine." Twilight placed one of the blue labeled bottles next to her on the table, then reached behind her and spread her pussy lips with her fingers. "I do want to do all that science, but the real answer is that I've been looking at your naked body and erect penis for half an hour and I'm aroused nearly out of my mind. So if you want to, please come and put it inside me already."

Sunset couldn't deny she wanted to. She got up from and moved behind Twilight. She chugged the potion, then pressed herself slowly inside. She could believe Twilight had extensive experience with "accurate models" - she began sinking in to her dripping opening easily, and moaned.

"Subject is very well endowed," Twilight panted into her recorder as Sunset sank in, "and unique phallic nature is easily distinguishable. The flared head has a - ah - strong and pleasant effect on the vaginal walls."

Sunset reached around and cupped one of Twilight's breasts in her hand, pressing steadily forward.

"As observation noted, subject has a slight medial ring, though not as pronounced as in terrestrial equines. Still," here Twilight gasped, "it is possible to feel it entering the vagina."

Sunset found herself drawn in by the narration. Twilight's large nipple was firm against her palm, and she squeezed and stroked it, eliciting a gasp. It was followed by a moan as she bottomed out, slapping her full balls against the lips of Twilight's sex.

"Subject's testicles feel heavily loaded, which agrees with Rarity's report. Their weight is noticeable as they press against the labia, even with a horizontal entry."

Sunset felt she must be getting at least a bit used to her new cock. Twilight wasn't any less sexy than Fluttershy or Rarity, but while she felt her orgasm was close, she had few good thrusts in her. She began deep strokes, pulling out just to the medial ring before plunging back in.

"Ah, subject is engaged in deep mating strokes," Twilight was panting into the recorder now, "and the medial ring and head flare massage the vaginal walls. Oh it's incredible. The flare hits my g-spot when she strokes out, this is way better than any of the dildos. I'm going to cum in like two more strokes."

This was too much for Sunset. "So am I," she muttered, and felt her flare deploying in preparation. Beneath her, Twilight began shaking and her pussy clenched hard.

"The, ah, hardening flare, ah, is hitting me just right, I'm oh God this is so good, this is the best I've ever cum. I can tell I'm sealed off, she's about to start loading me up. Oh I'm ready. Sunset, make sure to go as deep as you can!"

Sunset obliged, burying herself in Twilight as she began pumping her seed inside the lithe girl.

"Oh, I can feel it in my vaginal passage," Twilight reported, "there's so much of it! I can feel the pressure on my cervix, but it can't get out any other way. Mmmm-oh, that hurt a little, but the good kind, like fingernails or a nipple pinch. That must have been some going through. I wish I could feel it hitting my womb! Oh, there it is again, mmm this is nice I'm going to cum again, dear Lord Sunset, keep giving it to me!"

Sunset couldn't have stopped if she'd wanted to, of course, her magical balls emptying inexorably into her friend, far more than a natural cock could hold.

"Oh, I feel it now, sort of, just a pressure in my belly. It's so weird, but hot too." Twilight looked down. "It's like Rarity said, I can see it! And there's more coming!"

Twilight began shuddering again as Sunset rode out the last of her long, seed-pumping orgasm and her magical dick vanished. Quickly Twilight pressed a hand over her pussy, though a bit of sperm oozed out between her fingers. She measured her bloated belly and recorded the result, then squatted over the bowl, letting Sunset's massive load dribble out. When it seemed to be done, she poured it into a smaller beaker and placed it in the freezer. Despite the fading of her dick, Sunset had trouble taking her eyes off of the naked girl and the way her tight body moved as she hurried around the lab. She thought about what she'd just done to her, and shivered with naughty satisfaction.

"Enough for today?" Sunset asked.

"Oh," Twilight blinked. "Well, I suppose I don't technically need you for the next part, so you can go if you want, but I'm just getting started. And I was hoping you'd stick around, I could get a bit more data from you too."

Sunset shrugged. Her frustration had cleared up with her orgasm, and she had nowhere else to be.

"Sure, I guess. What's the next part?"

"This," Twilight picked up one of the yellow potions and, before Sunset could say anything, chugged it.

For a minute, Twilight only had a strange look on her face, then with a flash of purple magic, her own penis appeared. It was roughly the size of Sunset's...but it was a fully human, uncircumcised cock.

"Whoa," Sunset said, "you got a human one."

"Ugh," Twilight said, "you weren't kidding about the arousal, I can barely think strait! But I suspected this might happen. I think the magic doesn't read whatever magic made you a human, so it's giving you the penis your true form would use. As a full human, I get my own. Also, now we'll be able to see if my penis reappears in situations of arousal like yours does."

"Okay but uh, no offense, I'm not all that interested in having one inside me. And it's fertile anyway. What are you going to do with it?"

"I made it fertile since I want to compare samples of the fertile and infertile sperm to see if they're magically distinct." Twilight placed the rest of the potions next to the bed. "So I'll have to collect some of it. As for the rest, uh..."

Sunset rolled her eyes. "I just shot a massive load in you. You don't need to be shy."

Twilight was blushing furiously regardless. "I really like your breasts. Uh, do you mind lying on the bed and letting me look at them and uh, get off on them?"

Even if she'd been inclined, Sunset couldn't say no to that adorable blushing face. She lay down on her back on the bed, and Twilight crawled on top of her, resting her still-dripping pussy on top of Sunset's pubic hair. Slowly she began stroking her new cock, moaning at the sensation.

"Wow Sunset, I can see why you like this, it's totally different than having one inside you." She groaned and started stroking faster. "Also you're so lucky to have such big breasts and still have them so nice and full. They're just beautiful. They make me really hot."

Sunset felt herself warming at Twilight's words, and before she realized what was happening coherently enough to issue a warning, her own pony cock was back...having materialized hilted in Twilight.

"Mmm," Twilight sighed, rocking her hips, "I'd hoped that would happen. Now we can do two experiments at once. Sunset, drink two of the blue potions if you don't mind."

"Two?" Sunset was a bit distracted by the feeling of Twilight bouncing on top of her newly reappeared shaft.

"Well," Twilight panted, "we just found out that if you have a refractory period, it's very short, probably because you get new nerves and muscles every time the spell fires. Now I'm curious if additional potions have an effect on the etheric energy you release, which Ethyl 2 is still tracking, or on the volume of ejaculate you produce."

Sunset decided not to question a good thing. She quickly chugged both potions. The first, as usual, didn't seem to do much, but upon drinking the second, she felt warmth again gather in her balls, and they clenched and churned, feeling even heavier.

"I think you're right, I feel like I have even more than last time." She'd meant it as a warning, but Twilight shivered on top of her.

"I can't wait," she moaned, and began stroking her own cock faster. "Oh Sunset, having you inside me while I jerk this cock is just unbelievable." Within what seemed like moments, she was grinding her hips against Sunset's buried meat while her own jerked. Sunset saw her balls clench, and braced herself, then the first splash of cum rocketed directly on to her left breast, leaving a wet streak. The second glazed her right, then the third landed between them. While they weren't as big as the blasts she'd landed on Fluttershy, the magic clearly worked to increase human cum production as well, and Twilight kept jerking, each spurt causing her to press down and twitch delightfully on Sunset's own cock.

After a handful of spurts, Sunset's chest was coated, a sensation she found surprisingly erotic, and Twilight had gathered enough of her wits to send a few ropes into a beaker instead of on Sunset's orange flesh. After she had her sample, though, she let the rest splatter all over Sunset's eager body, to the delight of both. Just as her dick faded with a final volley, Sunset felt her flare beginning to deploy.

Twilight clearly did too, letting out a moan. "Quick," she said, pulling Sunset's arm, "get on top of me so it can go all the way in."

Without leaving her lover's body, Sunset sat up and Twilight wrapped her legs around her, allowing her to lay back. As Sunset loomed over Twilight, Twilight's own cum dripped down off of Sunset's chest on to her small breasts and (for now) flat stomach. Both girls shuddered in delight.

Sunset got a few deep thrusts in as her flare stiffened, bringing Twilight to the verge of a vaginal orgasm to follow up on her recent phallic one. With a final thrust she buried herself all the way in, ponderous balls pressing down on Twilight, who wrapped her legs around Sunset, holding her in to the hilt as both plunged into orgasm.

Sunset could tell the sheer volume of cum was unprecedented. Each rope was so large, and they were so frequent, that they barely felt separate, almost a continuous flow of seed into the tiny girl writhing in pleasure beneath her. After the third, every time Sunset's cock twitched Twilight squeaked as cum flooded into her womb. Both girls watched in awe and filthy pleasure as her belly swelled with Sunset's supernatural load. Soon the tiny girl looked near ready to give birth, and still Sunset's balls hung heavy.

"Sunset," she moaned, "pull out, I'm too full."

Sunset obeyed, her horse cock withdrawing from Twilight with a flood of warm cum, drenching the bed. It only got worse, as the waves of semen continued. The first splattered on Twilight's swollen belly, painting the lavender skin white. The depraved sight only made Sunset cum harder, and the next spurts drenched her heaving chest and rock-hard nipples, before the next soaked her lips and cheeks. With a moan Twilight licked off all she could, and the sight made Sunset pant with arousal, blasting the remainder of her load all over Twilight's hair. Finally, having filled her friend's womb to the brim and covered her in sticky semen, the magical organ vanished. Both girls promptly fell over, not caring about the sticky bed in their exhaustion.

After a long while, Twilight sat up, semen dripping off her entire front and out of her stuffed pussy. "Well," she said, "I think we learned a lot. It's only a pity I couldn't take it all, now we won't know how much bigger the load really was."

"Twilight," Sunset sighed, "I think we've proven it's significantly bigger."

Twilight frowned, but finally nodded. "I suppose it'll have to do."