"A...a demonstration?" Twilight stammered. Her spirits didn't know whether to rise or fall, so they just flailed wildly, leaving her face stuck with an expression of utter befuddlement.

"Did I not speak clearly?" Celestia said, not quite crossly. "If I am going to get any idea of how your studies have been going, I'll have to see the spell firsthand."

Twilight's mouth was so dry she could barely move her tongue. "Couldn't you just look at my notes?"

"That will suffice for preliminary considerations, but I will need to see the spell in action." She crossed her arms and put one leg over the other. "Body modification spells of this type are among the most difficult to perform. No matter how it sounds in theory, it's impossible to analyze unless it's actually being cast."

"O...okay." Twilight's body tightened like a spring. "I...I'll need to find someone to cast it on."

"Oh?" Celestia raised an eyebrow. "I suppose you do. In that case, I can spare some time."

Twilight began to relax. Slightly.

"An hour," Celestia continued.

Twilight tensed up again. "Only an hour?"

"I'm willing to give you some leeway, Twilight, but I do have a schedule to keep. Besides, you've already cast this spell on several of your friends, correct?"

Twilight nodded.

"I'm sure at least one of them will be available." Celestia played with the tip of her hair. She smiled. "I have no doubt in your ability to pull things together. I look forward to your presentation."

Twilight's head felt like a balloon as she wandered aimlessly along main street. She had one hour... well, fifty-eight minutes now, to convince one of her friends to grow a cock and let Celestia examine it. Sure, they might all be around town, but who in their right mind would actually be willing to do that? Twilight stopped and took a long breath, forcing herself not to hyperventilate. Surely her friends would be reasonable. They knew how important her studies were. Surely they could see that it was vital for her to have someone to demonstrate how the spell worked... dammit she would just have to scalp her tickets for the next Grand Galloping Gala and pay them off with that.

She'd just have to pull out all the stops when it came to convincing her friends to temporarily abandon their modesty. She needed someone reasonable. Someone who was willing to help a friend, even if it meant being humiliated by growing a penis in front of the ruler of the country. She needed Applejack.

"You want me to do what?"

"I just need someone to demonstrate the spell on!" Twilight explained, trying to sound as though it were no big thing. "That way Celestia can see it in action, and I won't fail my assignment, and I'll get a nice big research grant!" She smiled a bit too widely and drummed her fingers together. "It's money that I could put towards researching a magical discouragement field to keep pests off of your farm." She winked conspicuously.

Applejack just stared blankly, her face devoid of any response.

"Well?" Twilight held out a hand. "What do you say?"

"Have you been eatin' Pinkie's special brownies or somethin'?" Applejack asked. "Cause you gotta be high off your tits if you think I'm gonna sprout a cock in front of Celestia! Seriously, what the hell are you thinkin'?!"

"I thought that because you originally offered to be the test subject for my genderflipping spell that you'd be willing to help me out here. You did offer to help me, didn't you? I was pretty upfront with the fact that I'd have to... uh... document the results of the spell."

"You also assured me that I'd remain totally anonymous, and more importantly, you said that nobody else would ever see it!" Applejack crossed her arms. And also her legs. "It's a pretty big jump from bein' an anonymous test subject and growin' a whole new set of anatomy in front of Celestia. No way in hell am I even considerin' it."

Twilight bit her lip and decided to appeal to Applejack's more base appetites. "But I thought that you liked having a dick. Doesn't it feel really good? I mean, whenever you end up with one you always have the time of your life with it. Remember when we did it? Didn't you enjoy it?"

Applejack snorted. "Twilight, you know how hard it is to think straight with that thing hangin' off me. If anythin' that's another reason not to. I don't want an extra body part messin' with my head. I mean, yeah, okay, it was pretty fun when I banged you with it, but that's not even close to the same as havin' somepony starin' at it. And the last thing I want is for my libido to go nuts and for me to try to get Princess Celestia to give me a blowjob or somethin'. Once my hormones were back to normal, it would be the most humiliatin' thing ever. I'm not takin' the chance."

"I thought we determined that the spell had no affect on your psyche that couldn't be explained by the placebo effect."

"I don't care!" Applejack rolled her eyes. "I ain't growin' no dick in front of Celestia and that's that!"

"Applejack, pleeeaase!" Twilight abandoned her approach and decided to go to the last resort. She fell to her knees and began to paw at Applejack's pant legs like a cat. "Pleeeeeaaaasse! My grades are at stake!"

"Yeah, well, my dignity is at stake." Applejack grabbed Twilight's shoulders and hauled her off of the floor. "I'm sorry, Twi. I wish I could help you, but I just don't feel comfortable with that. It's just too weird, even in light of everythin' that's happened already. Why don't you go ask somepony else who's a bit more... less inclined to feel weird about it."

Twilight sighed. "You're... positive about this?"

Applejack nodded. "I'm afraid so."

"Fine. I understand. I guess." Twilight waited until she was out the door to cry out in frustration. Hopefully Rainbow Dash would be a bit more amenable to the idea. Especially if Wonderbolt tickets were involved.

"crapcrapcrapcrapcrapcrapcrapcrapcrap," Twilight muttered to herself as she stomped down the road. The tension rose with each step. Her frustration, which had been simmering like a pot of hot chili just beneath the surface, was raising to a boil. Rainbow Dash was no prude, but at the same time she put far too much emphasis on her reputation. Would she really be willing to risk being a willing test subject? Granted, she didn't seem to have any qualms about dropping by to request a dick for "personal use". Then again, she also took pains to make sure that no one but Pinkie Pie could accidentally bust into her house. And Celestia would want "documentation". Whatever that meant. Twilight bit her lip. If she called in some favors, she could get Rainbow Dash a day with the Wonderbolts. That was worth growing a dick, right? Now she just had to get to the house.

She silently willed her hot air balloon to rise a bit faster. In her head, she rehearsed what she would say. The good thing was that it wasn't really a question of logic. As long as she through out enough facts, and quickly enough, Rainbow Dash would probably just go "Okay, fine, just stop talking!" before she even realized what she was agreeing to. There would be a brief window between the agreement itself and the realization of what she had just offered to do. Twilight already had a whole litany of thanks ready to fill that space with. If she were grateful enough, Rainbow Dash's loyalty would kick in and she'd probably go along with it despite her second thoughts.

As the balloon reached the door of Rainbow's house, Twilight took a deep breath. Then she let it out immediately, because there was a note taped to the door.

In Cloudsdale on business.

Awesome business.

Twilight groaned. It was a long, low, sound that grew louder and louder before finally erupting into a screamed profanity. The chili pot of her nerves had boiled over.

"FUCK!" It echoed between the clouds, catching the attention of a few kids below that Twilight wasn't paying attention to. Their moms would have to explain it to them. For the time being, Twilight focused on steeling herself for her last resort.

Twilight looked at her watch. She had seven minutes. She could certainly get an affirmative answer here, but the question was whether she wanted one. Celestia wanted a patient and understanding test subject, not someone who was likely to smack her upside the head with her cock just for the lulz of being able to say that she had turkey slapped a princess. And then after that, Pinkie would probably want to travel to Canterlot to put her dick in Luna's ear or whatever, and then she'd want to go all the way to the Crystal Empire to drape her nuts over Cadance's forehead to get the trifecta and Shining Armor would probably walk in on it and it would be so awkward.

Twilight looked up at Sugarcube Corner.

"Fuck this, I'll do it myself."

As she walked back to the library, she had sufficient time to think over the implications of her declaration. Namely that she had never used the spell on herself before, and that it would require her to be naked in front of Celestia. Granted, Celestia would be examining an anatomical feature that Twilight didn't normally have, but Twilight wasn't sure that made it worse or better. As a young girl she had had something of a crush on her mentor, and even had the occasional fantasy of being a bit intimate with her, fantasies that may or may not have involved some self-stimulation. Of course, she hadn't ever fantasized about having those experiences as a hermaphrodite. She forced herself to breathe slowly. It would be fine. Awkward, yes, but Celestia would certainly be professional about the whole thing.

She swallowed, and opened the door. Celestia was waiting.

"So, where's your test subject?" she asked.

"I..." Twilight didn't want to answer, but she forced it out. "I guess it's going to be me."

"Really?" Celestia raised an eyebrow. It sounded like a genuine question. "None of your friends were willing to help?"

"Oh, some of them were, but..." Twilight thought of Pinkie Pie trying to rub her balls on Celestia's crown. "I thought it would be most prudent to do it myself."

"If that's your decision, that is fine." Celestia leaned back and folded her arms. "This is your first time performing this spell on yourself, correct?"

Twilight nodded, not at all happy that the answer was affirmative.

"I'm guessing that it feels a bit uncomfortable?"

"Yeah, just a bit," Twilight said, making full use of her capability for understatement. "The idea is kind of... freaking me out a little."

Celestia put a reassuring hand on Twilight's shoulder. "Twilight, you know me. I don't want this to be awkward. I have no intent for this to be anything other than purely professional. I have no intention of doing anything untoward, and I fully recognize that you weren't intending to cast this spell on yourself. I will not let this influence my perception of you."

"I know, I know. It's just... it's so weird. I mean, things aren't going to be the same between us, no matter what you say. They can't stay the same; not if you've seen me..." she bit her lip, "...like that."

Celestia only rolled her eyes in response. "Twilight, you severely underestimate the perversions I've encountered over the past millennium. Compared to some of the things I've seen, the fact that you temporarily possess partially male anatomy will barely even register. To use the common vulgarism, I've seen some shit, Twilight."

"R-really?"

"Twilight, can I trust you with a secret?"

"O-of course!"

"Well, if you spread this I will deny it categorically, but just a week or two ago I caught my sister masturbating to a comic of Daring Do having sex with a tree. And not like an anthropomorphic tree or a dryad or anything, just Daring Do humping a tree. And Daring do had three breasts for some reason. And I didn't even blink. I told you, this won't even faze me. Doubly so as you aren't doing it due to interest. If anything, it's more surprising that you aren't doing it for... personal reasons."

"I, uh..." Twilight had never known that Princess Luna was a Daring Do fangirl. She suddenly realized who it was that might be responsible for that one fanfic she had read. She also tried not to think of how good it had felt to get boned by Applejack.

"Are you ready, Twilight?"

"I... I might as well get it overwith." She looked Celestia in the eyes. "Do you want me to cast the spell?"

Celestia nodded.

Twilight took a deep breath. Now or never. She summoned up all the magic she could muster and let it pour into herself. It washed over her in warm, tingly waves. The sensation drained into her groin, and she could feel it taking form. Her pants suddenly felt very tight.

Celestia crouched down, her elbow on her knee, her chin resting on her knuckles as she stared at Twilight's crotch bulge. "Hmmmmm," she said.

"Well, th-there's the spell," Twilight stammered, trying not to think of the flood of new sensations that she was feeling. "I... I guess that you want to... see it?"

"That would be my reason for being here, yes." Celestia nodded. "Do you mind if I..." Her eyes darted back to Twilight's crotch.

"G-go right ahead." Twilight nervously drummed her fingers. Her hands were shaking so much that she wasn't sure that she could undo her pants even if she wanted to.

Celestia's fingers deftly undid Twilight's belt, so quickly that Twilight briefly entertained the thought that Celestia must have done this before. Her mind immediately turned back to reality as she felt a draft and realized that her pants were around her ankles.

"Twilight, I never would have expected your panties to be quite so... frilly."

Twilight's already flushed face flushed a little more as she remembered what panties she was wearing. They were indeed quite frilly. And slightly transparent. "I don't usually wear that kind of underwear," she mumbled. Why it was important to clarify that, she couldn't say. The panties were less embarrassing than the fact that they how had a penis scrunched up inside them. "Pinkie Pie gave them to me as a joke for my birthday, and I hadn't done my laundry yet this week because I was trying to get ready for my visit, and... uh..."

Celestia was quite obviously not paying the least bit of attention. She was too busy examining Twilight's meat missile. Through the sheer fabric (Pinkie Pie had naturally picked the sheerest of the sheer; it didn't "cover" the cootch of the wearer so much as "make it appear slightly pinker"), she could quite easily make out the shape of a roughly medium-sized cock and some squishy-looking balls. Unfortunately, Pinkie had gotten Twilight's non-penis proportions exactly right, and as a result the panties kept the new body parts from unfurling. Her fingertip glided lightly over the thin fabric, imagining how soft the skin inside it must be. It was brand new, after all.

"S-so, as you can see, the spell was successful," Twilight mumbled.

"Yes, I was monitoring the magical frequencies caused by the spell," Celestia answered, her eyes still glued to the transparent underpants. "I will have to analyze the data as soon as I return. But for the time being, I will have to record the immediate results of the spell. I trust that you will collect the rest of the data points from other experiments for comparative purposes. Do you understand?"

Twilight nodded. "I guess you want me to take my panties off, now?"

"No need for that," Celestia said.

"Huh?" Twilight finally dared to look down. She focused on Celestia's face rather than on the protrusion for where her vagina typically was. "I don't have to take them off?"

"No," Celestia said. "I can do that myself."

"Oh." Twilight wasn't sure what to make of it. Celestia didn't sound flirty or lascivious, but that might just mean that she was very good at hiding it. No, Twilight told herself. Princess Celestia is professional. She wouldn't lie to me about this. Twilight focused on that thought. It was less disconcerting than the sensation of her panties sliding down her hips.

Author's Note

Stay tuned for the sequel story, Pinkie Pie Teabags Everyone, coming this spring to Fimfiction!

(Note: I'm not actually writing that)

Sexy shit starts next chapter.