The Strange Designs of the Elements of Harmony

“I'm sorry to bother you with this matter, princess. I know you are a very busy pony.”

Twilight Sparkle nervously walked by Princess Celestia's side through the halls of the royal Canterlot castle, trying to keep up with her graceful gait. The big monarch's size made each of her loud hoofsteps cover more ground than a regular pony, so she was used to slow down her walk when she was in company.

"It's no trouble, my dear Twilight. You know you're always welcome here,” Celestia answered gently. “I'm the one who should apologize for not being able to attend you until now. Unfortunately, things have been a bit fuzzy in the castle lately.”

Twilight sent her letter to the Princess six days ago. She asked her for an appointment to talk about the unexpected effects the Elements had on her and her five new friends. She might have had to be more direct in her missive about what those effects were, but she didn't had the courage to do so. In fact, when Celestia sent her a reply, setting the meeting in six days, she felt somewhat relieved. She was afraid that her visit would come too soon, maybe the next morning, or even as soon as she received the answer. She wanted to get herself ready; to gather her thoughts before talking about such a personal topic.

The six days, however, passed too quickly for her. She was still not prepared to talk about something like that with her mentor.

“Fuzzy?” Twilight asked. “Why is that?”

Celestia looked down to answer her.

"It's because of my sister, Luna. Oh, I don’t want to rest the blame on her, bless her soul, but a thousand years have passed since she set a hoof on Equestria, and a lot of things have changed. She’s having a hard time trying to adapt to the current customs and the poor thing is being a real headache to the castle's servants and guards. I also try to help her as much as I can, of course, but my royal duties don't leave me much time for it, unfortunately.”

Twilight looked up to her mentor's face, as she tried to listen carefully. The young unicorn was not particularly tall, barely five feet four inches, so Celestia's tremendous seven feet four inches made her stay well below her shoulders. That height added to her snowy fur, her long horn, her wide wingspan and her ethereal tail and mane of green, pink and cyan tones gave her a truly beautiful, imposing and majestic appearance.

Despite her grandiose aesthetic, Princess Celestia also managed to give off a maternal aura with her voice and her gestures naturally. Well, and with her body too. The low-cut pink dress she wore tightly hugged her generous curves, from her wide hips to her colossal breasts, which visibly bounced with her every step. On a regular mare, she would already be considered a very attractive figure, but someone as tall as Celestia was truly a magnet for every sight around her.

Princess Celestia had always liked to dress provocatively. Maybe it was because she had always seen her like this since she was a filly, but Twilight had never paid much attention to that daring habit of her mentor; however, today was different. She didn’t really know why, but Twilight couldn't help but glance every now and then at Celestia's generous ass and gigantic boobs. It’s not that she'd never noticed her assets, of course, but that sight was really filling her with lust, and that had never happened before with the Princess - or not as much as that day, at least.

What are you doing? Focus, Twilight!

“Besides, now that she's back, my idea is setting up a diarchy again and rule the two together like we did in the old times, but there are many nobles who are reluctant to that idea. Luna is a very capable and trustworthy ruler, I can assure you that, but after a thousand years there is no one left on the council who can corroborate that except me.” Celestia sighed. “They would really accept my will without question, but I want to demonstrate them that they can put their trust in Luna before being under her rule. So, all in all, there's still a lot of rough edges to iron out.”

"Oh, I see…" Twilight replied. “I guess the way she appeared before all the ponies doesn't help either.”

“It's one of the cons they used, of course, however I'm sure I'll be able to convince them that Nightmare Moon won't appear anymore,” Celestia said with a smile.

They finally reached her destination: Celestia's chambers. A pair of guards clad in golden armor and armed with long, pointed spears guarded the entrance, and seeing the princess and her student approaching, one of them opened the door to let them through. Celestia bowed her head in thanks, the pair stepped inside, and the door closed behind them.

Twilight had entered that room countless times, and little had changed over the years. Far from being a simple bedroom, Celestia's chambers also had a large study table, several bookcases with volumes from her personal collection and several couches next to a tea table for personal meetings, as well as a large fireplace to warm the room. And of course, a huge royal bed appropriate to the great size of the princess, a dresser and various cabinets in which she kept her clothes.

“Make yourself comfortable, Twilight.” Celestia pointed at the couches. “My chambers are your home.”

“Thanks, Princess.”

Twilight decided to sit on the corner of a fluffy three-seater while Celestia sat in a wingback chair suitable for her large size, across from her student.

“Do you want to start with something specific?” Celestia asked. “I'm sure you’ll have many questions.”

“What are…?” Twilight hesitated for a moment on how to phrase the question, and she finally opted to start from the basics. “Can you explain to me what the Elements of Harmony are exactly?”

Celestia smiled.

"I thought you already knew what they were, Twilight. I've seen you study them extensively these past few months.” Celestia cleared her throat. “The Elements are a physical manifestation of the magic of harmony. Their origin is pretty much unknown, but the most accepted theory is that they appeared in response to a magical imbalance between harmony and chaos. Each of the six elements try to compensate for the chaos among the ponies by promoting virtues related to harmony…”

“Yes, sorry for interrupting you, Princess, but… Since you were also a bearer of the Elements, I was wondering if you could tell me something else that wasn't in any book.“

Celestia looked up at the ceiling, thinking for a moment.

“Mmmhh. I’m afraid that everything I know about them I have either written about it myself or have passed the information on to other writers, although I must admit that several centuries have passed since anything new has been written about them. Keep in mind that the last time they were used was a millennium ago, so they were forgotten by the pass of time for most ponies.”

"But not for you, I’m sure. You were the last pony channeling their powers, after all.”

When she heard that, Celestia's expression darkened for an instant and lowered her gaze to the ground.

“It's not something I'm particularly proud of. Using the Elements against my own sister was one of the hardest decisions I’ve ever made in my long life. Probably the hardest.” Celestia looked back at Twilight with glassy eyes. “That's why I can't be thankful enough to you and your friends for bringing Luna back. You don't even know how much I've missed her, Twilight. Sometimes I see her and I think I'm dreaming.”

A tear slid down Celestia's cheek and she hurriedly wiped it away with one hand.

Twilight felt tremendously proud for making her tutor and sovereign so happy. She had never seen her cry with happiness until the day she and her friends released Luna with the Elements, bringing both sisters together again.

“It's okay, Princess. You’ve always been so kind to me, so if you are happy I am, too.” Twilight said with a bright smile.

Celestia used a few seconds to regain her composure.

"You still have a long way to go, but it warms my heart seeing how much you're maturing," the princess continued. “About your doubts, maybe if you ask me something more concrete I can clarify them. You talked about some ’unexpected effects’ in your letter, am I right?”

Twilight swallowed hard.

“Y-Yes.” Twilight then cleared her throat louder than she’d have liked. “Okay, so… Did using the Elements have any effect on you?”

Celestia thought of an answer for a few seconds.

"Hmm, it could be, yes. But I'm not really sure."

“What do you mean?”

“As you surely know, Luna and I were both the Elements bearers. Each of us represented three of them. The only time I channeled the power of all six relics was to use them against Luna. Surely using the Elements against one of the bearers was the reason I was later rejected by them.

“Luna and I were always very close, but after using the Elements together for the first time… I felt even closer, as if I could understand her even better. But to be honest, I couldn't tell you if it was due to the influence of the Elements or if simply working together to defend Equestria from dangerous threats brought us even closer together.”

“I understand what you mean, Princess; I also felt something similar with my friends when we channeled their powers.” Twilight suddenly remembered that night with Pinkie a few days ago, and then realized that her conversation with Celestia was following the same path. “Uhhhh…”

The unicorn was speechless for a moment, her cheeks red. She knew that this moment was going to arrive; she knew it from the very moment she sent that letter. And that moment was now.

“Is there something wrong?” Celestia asked.

“I… You… Aside from improving your emotional bond with Luna, did you notice any other change? Any physical change?”

"Oh…" Celestia put two fingers under her chin and thought for a moment. “Well, I'm not sure either. When Luna and I became the bearers of the Elements, we were still young alicorns. It hadn’t occurred to me that these could have affected our bodies. Unfortunately, the only alicorn in existence right now who hasn't been a bearer is Cadance, and she's still too young to be sure she won't develop like us. However, now that you mention it…”

Twilight blushed again as the princess looked down at her massive bosoms and touched one of them with a hand. It was a gesture filled with genuine curiosity, but for Twilight it was still tremendously embarrassing.

"I can say that my breasts and Luna's didn’t stop growing during the more than two hundred years that we were linked to the Elements of Harmony despite having reached our maximum height about a century and a half before," Celestia continued, this time lifting one of her breasts for more emphasis. “And ever since the Elements rejected me, they haven't grown even an inch. The same may have happened with Luna, but it will still take several weeks or even months for her to return to her old form. Unfortunately, purging Nightmare Moon from her body has temporarily sapped her magical power along with her physical body, so we’ll have to wait to check that.”

"Prin-Princess, please…" Twilight stammered. “Don't do that while I’m here.”

Celestia looked at her disciple with a confused expression for a few seconds. When she understood the cause of her blush, she released her massive tit and stifled a giggle.

“Oh, Twilight, always so demure.” Celestia smiled angelically at her student. “We are both fully grown mares, old enough to talk about these topics openly. Besides“ - this time she raised both boobs in Twilight's direction, holding them with both arms - “you had a lot of fun helping me clean them when we had those baths together.”

“I-I was only eight years old! I didn't know what I was doing!”

"Actually, you were still bathing with me until you were twelve years old. It’s a shame that we left behind such a beautiful habit.”

Twilight was sure that Celestia felt amused by reminding her of such anecdotes, but mockery was completely missing from her tone. Unfortunately, that didn't matter: talking about those embarrassing situations while her mentor moved her mammoth tits in front of her had caused a certain friend between her legs to wake up with vigor, escaping from the prison that were her panties. Fortunately, her skirt was long enough that it wouldn't be obvious while she was sitting.

"Anyway," Celestia released her boobs to stop tormenting Twilight, “I suppose that if you are asking about physical changes, it’s because you have noticed something odd about yourself?” She smiled radiantly. “Are my little Twilight's breasts growing?”

I wish…

"N-Not exactly," the unicorn replied sheepishly.

Twilight looked away, still flushed, and remained silent. Celestia gave her some time to continue, but her explanation didn’t come.

“There’s no need to be ashamed, Twilight. I promise you that, whatever it is, I’ll treat it in the most professional way possible,” the princess assured.

Despite those words, Twilight was still dubious, but she knew that she could trust Celestia. She was surely the pony she trusted the most—perhaps even more than her own parents—so she decided to move on.

"I-It's a-a... a, a... a-a... a... penis." Twilight stammered something inaudible.

“I beg your pardon?”

“A-A… A… penis.”

"I'm afraid you'll have to speak more clearly, Twilight."

“Aaaagh! Buck it!”

Closing her eyes tight, Twilight parted her legs and lifted the purple skirt she was wearing up to her chest.

After a few seconds of holding her breath, she realized there was no response from Celestia. She could feel her mentor's gaze even with her eyes closed, and she could tell that her own cock was very stiff, so she was one hundred percent sure that it caught Celestia’s attention.

Twilight couldn't stand that silence anymore, so she finally opened her eyes.

Just as she thought, Celestia was staring at her crotch with her mouth slightly open and eyes wide.

“Holy shit! You have a cock!” Celestia exclaimed. “And a good-sized one at that!”

"Prin-Princess!" Twilight brought her skirt down to cover her embarrassment again as she glared at her mentor.

“Oh, yes. Professionalism.” Celestia cleared her throat and shifted slightly in her place to regain her composure. “I’m truly sorry, Twilight. It’s…definitely it’s not what I expected.”

"I guess," Twilight answered through clenched teeth.

"So… have you had that since you used the Elements?"

The unicorn sighed. “Me and the other five bearers have it since the night after when we used the Elements.”

“All… All six of you?”

Twilight nodded. “*Ahem* The six of us have gone through a medical check-up at the Ponyville hospital and they have verified that it’s fully functional with the only exception that our… semen is infertile. Furthermore, we still have our female genitalia intact, including our ability to ovulate. Do you have any idea why the Elements would do such a thing?”

Celestia was still looking slightly perplexed, but after hearing the question, she scratched her chin as she tried to think of an answer.

“Well, there are several possibilities,” answered the princess. “It may be some kind of reward that they have decided to give to all of you for your good work.”

"A-A reward?"

"That's right," Celestia nodded. “I may be wrong, but as a result of our previous conversation, it has occurred to me that the gradual enlargement of my chest may have been some sort of compensation for the services rendered to the Elements of Harmony.” Celestia patted one of her tits. “I can say I’m certainly very happy with the results. What do you all think about your new parts?”

"Well…" Twilight blushed again at the thought of what she was going to admit. Despite her wardrobe problems, the truth is that she had taken a liking to her new penis. And to Pinkie's too, of course. “At first there were all kinds of reactions, but the general feeling is... quite positive at the moment.”

“I’m guessing that it’s because their performance is satisfactory.”

“Performance?”

“Sexual performance."

“Prin-Prin-Princess!"

Celestia didn't say anything; she just tilted her head slightly, showing a poker face while waiting for an answer. Understanding the gesture, Twilight sighed and gave up.

"Yes, it is satisfactory," the student admitted. “More than satisfactory, in fact.”

Hearing that answer, Celestia couldn't help but smile from ear to ear. Twilight responded with a scowling face, but the princess wouldn’t hide her feline smile.

“Let me guess: you have verified that sexual performance between yourselves.”

Twilight had blushed several times this morning, but it paled in comparison to that moment. She tried to raise a complaint, but all that came out of her mouth was pointless babble.

“Twilight, Twilight.” Celestia held up a hand to try to calm her down. “It's okay, you're all grown ponies.”

But Twilight didn't care. The young unicorn, crestfallen, covered her face with both hands to try to hide her blushing expression. She wished the earth had swallowed her up right then.

“Besides, it makes sense if you consider another possibility.”

Twilight kept her face covered, but seeing her ears twitch slightly at her last sentence, Celestia continued.

“As you know, my sister and I were the previous Elements Bearers. For these to work correctly, each of the bearers must be, at least, an excellent representative of their Element’s virtue, but also, there must be a strong emotional bond between them. Luna and I were very close sisters, so that bond was pretty strong already. And yet, it’s possible that the Elements further strengthened that link to ensure their functionality, as well as physically "rewarding" us as an incentive so we won’t abandon them.”

Twilight, at that point, still covered part of her face, but she watched her mentor and listened intently.

"But despite their best efforts," Celestia continued, "Nightmare Moon's spirit managed to invade Luna's will and I was forced to use the power of the Elements against her, the other bearer. Surely that was a great disappointment for them, so they rejected me after what happened and became inert as there was no one left who could use them at that time. It’s possible that by choosing all of you as new bearers, the Elements wanted to ensure even stronger bonds so that the same thing doesn’t happen again. And for this they have decided to give you all a little push.”

Twilight thought back to that first night she spent with Pinkie; the same one in which they received their stud parts. It was true that after that experimental romp, the two felt closer. In fact, that same week they met again and had their corresponding sex session. How much was due to Pinkie's effervescent personality and how much was due to her stunning physique, gigantic cock included? She couldn't tell, but she was pretty sure that both things were a plus for her.

"So you’re telling me I should have… sex with my friends to enhance our bonds with the Elements?"

Celestia firmly shook her head.

“That’s the wrong way to look at it, Twilight. You shouldn't feel obligated to do something like that. I'm sure the Elements themselves wouldn't want it either. Simply continue with your work in the library, do activities with your friends, meet new ponies and learn all the ins and outs of friendship with them. If something else has to come up, it will come up.”

“I see. Nothing to force the situation.” Twilight nodded her head firmly. “Understood, Princess.”

"And keep sending me letters with what you've learned about friendship! Also, if you notice any changes that you think are related to the Elements, please let me know,” Celestia explained. “Do you have any more questions?”

Twilight pondered for a few moments. It was quite a personal question, but…

"Well, the truth is…" The unicorn was silent for a couple of seconds, hesitating; until she finally backed down. “No, I think that's it.” Twilight rose suddenly from the couch and bowed her head. “Thank you very much for everything, Princess.”

Celestia responded with a gentle giggle. "It's nothing, my dear student, but…" She pointed a finger at a spot below Twilight's waist, "if you're going to leave maybe you should take a look at that first."

Twilight looked down and, to her horror, saw that her erection was still as hard as before, but as she stood up, it was lifting her skirt visibly. She nervously tried to cover her bulge with her hands without much success.

Oh shit! What do I do now?

"I-I'm so sorry, Princess!" Twilight apologized. “This stupid thing seems to have a mind of its own.”

"Don't worry, my dear Twilight. If you need help with anything, you know you can count on me.”

Twilight, who was futilely struggling to try to lower her erection, paused for a moment.

"I insist," Celestia repeated as she winked at her, "with anything."

The young student was stunned. She surely was misunderstanding the Princess’ words, right?

“B-But… B-But… You are my teacher! A-And… And the Princess!”

"That shouldn't be a problem. As I said before, we are both grown ponies.” Celestia gave her a candid smile and squeezed one of her colossal tits. “Also, I noticed that my body is distracting you much more than usual. I'd say it's the cause of that erection.”

“B-But what about…?” Several words uttered by a certain pink pony on their second date came to Twilight's mind: ‘You don't even know how happy Mrs. Cake is with my new pullet! And Mr. Cake too! You should try it with more ponies, Twilight!’ “Uhhh… It’s nothing, never mind.”

"I'm just offering you my help. It doesn't have to mean anything else if you don't want to.” Celestia waved her hand at one of the doors to the room. “If you're not sure, you can use my personal bathroom and soundproof it to relieve yourself there while I continue with my schedule. Or if you want I can call one of my maids to help you. Or even one of my personal guards.”

Celestia was still watching her student with a motherly smile. Her gaze and her gestures were calm; she was trying to stop Twilight from making a forced decision.

Twilight stared at that serene gaze for a few seconds, and then she couldn't help but look down once more at her massive tits.

You should try it with more ponies, Twilight! She heard again in her head.

Twilight swallowed hard.

"O-Okay, but…" Twilight sat back down on the couch. “Actually, I do have something else to tell you, Princess.”

"Go ahead, I'm all ears."

“The truth is that during this week I have already noticed changes in my… male genitalia. Size changes.”

"You mean an increase in size?"

As Twilight nodded, Celestia's eyes lit up for the briefest of moments, but she quickly placed a hand under her chin thoughtfully.

"I didn't realize it at first, but after my first night with Pinkie…" Shit. Twilight paused for a moment upon noticing her slip, but since Celestia didn't say anything, she continued. “After my first night with Pinkie, my…penis and testicles had increased in size substantially.”

"Hmm, I see. How substantially are we talking?”

“Well… During that night, my erection was seven point one inches in length and five point nine inches in girth, and my testicles about an inch and a half in diameter.” Twilight looked down slightly and blushed. “The next day it was eight point eight in length and six point four in girth, while my testicles were around two inches in diameter.”

“Hmmm, that's a very noteworthy increase. And what about Pinkie? Or the rest of your friends. Have they undergone a similar change?”

Twilight swallowed as she tried to remember it.

“About my friends, none of them have told me anything. However, Pinkie… We went back to spend some time together a couple of days after the first night and I can say her… tumescence was slightly bigger.”

“I see… And there were more changes after that second time?”

"I'm still the same, and Pinkie hasn't said anything to me about it, but I'll check back on my next date with her," Twilight explained. “The question is… What can these changes be due to, Princess?”

Celestia murmured and scratched her temple thoughtfully.

"Okay, let's recap. What do the bearers of the Elements need in order to activate them?”

"Oh…" Twilight's reply came out automatically. “They need to be excellent representatives of the virtue of their element and have a strong affective bond with the other carriers.”

“Okay, let's turn now to the first point. What element do you represent, Twilight?”

“Me? I’m the Element of Magic, Princess.”

“That's right, but is ‘magic’ a virtue like the rest? You are certainly a unicorn with tremendous magical potential, but that is not the real reason the Element of Magic chose you, my dear Twilight. She chose you because of your potential to make friends. After all, ‘friendship is magic’.”

"But… I don't have that many friends."

Celestia smiled. “That’s exactly the point I wanted to get to. Tell me, Twilight, when the Elements gave you your new genitals, were you satisfied with their size?”

"W-what?" Twilight's cheeks reddened for the hundredth time that day. “But what does that have to do with anything?”

“Please be honest.”

Twilight looked away as she rubbed her arm. “Well…they were a little below normal, so…no, not quite.”

"Okay, and how about now? Are you completely satisfied or would you like them to be bigger?”

Twilight felt a chill and giggled anxiously.

"They're better now, but I wouldn't mind if they were…uhhhh…a little bigger. You know what they say: the bigger the better, haha…”

"I thought so," Celestia murmured, almost to herself. “Okay, now let's talk about Pinkie. She’s the bearer of the Element of Laughter. Delving a little deeper into the concept, the virtue of her element has to do with causing joy in others. Would you say that she is a good representative of her Element?”

Twilight thought about her for a few moments. About her extremely positive attitude, her wide smile, her eagerness to make friends with everyone and make them laugh…

“I still have to become acquainted with the rest of the Bearers in greater depth. I've only known them for a week, after all,” Twilight explained. “But from what I've seen, Pinkie is, in my opinion, the one that best represents her Element by far.”

Celestia smiled mischievously. “Then I suppose that she will have very large genitals.”

Twilight laughed nervously again. "I'm afraid 'very large' is an understatement, Princess. She may have the biggest…” At that moment, something clicked in Twilight's mind. “Oh, oh! Do you mean that the better we represent our Element, the bigger will be our…?”

Celestia nodded. "At least as long as the change satisfies the bearer. It’s only a hypothesis, but the possibility is there.”

Pinkie's words echoed in Twilight's head again: You don't know how happy Mrs. Cake is with my new pullet! And Mr. Cake too! If Celestia was right, the fact that Pinkie's member grew a bit after making more ponies happy would make sense.

And it also meant that the more friendships she forged, the more hers would grow…

"Do you have any more questions? Or anything else you want to tell me about this?” Celestia asked.

Twilight shook her head. "That'd be all, Princess.”

"Very well, then... Do you still need me to help you with your problem?"

Twilight could still feel the hardness of her erection pressed against her leg. The conversation topic added to the sight of the Princess’ luscious body kept her cock fully stiff during all that time.

“If you do not mind…”

Celestia smiled at her student. "It will be a pleasure, my dear Twilight."

The Princess got up from her armchair, approached her disciple slowly and knelt before her. Even in that pose, Celestia's enormous height meant that her head was still above Twilight's. Gently, she parted the unicorn's legs and lifted her skirt, bringing her erect member back into view.

"Those panties are too small to contain something that big, Twilight." Celestia reached under her skirt and brought the white garment down her lilac thighs, drawing a sigh of relief from her student. “Better now?”

Twilight simply nodded, and in response, Celestia wrapped a hand around her cock and rubbed it slowly as she flashed a gentle smile.

Twilight could hardly believe that Princess Celestia, the highest authority in all of Equestria, her guardian since she was just a foal, a mare who was almost like her second mother, was giving her a handjob so casually. Twilight's heart hammered in her chest as she felt her mentor's delicate fingers gently stroking her hard, veiny cock.

It didn't take long for Celestia to lower her muzzle to her member for a tentative lick. Her precum was already beginning to ooze and the princess caught some of her drops with her tongue.

"My little Twilight has grown so much…" Celestia said, licking her lips.

Then she opened her mouth and introduced the tip of his cock inside her. Twilight bit back a moan as Celestia sucked on her member while caressing its underside with her tongue, licking carefully each of its folds. Meanwhile, she put her other hand under the lock and gently toyed with Twilight's generous scrotal sac.
Twilight let out a loud moan of pleasure when Celestia made up her mind to effortlessly shove the entire cock down her throat in one sitting. She was surprised that the monarch could swallow it whole so quickly, but Celestia had countless years of experience. And a very deep throat, too.

The princess kept her muzzle pressed against Twilight's pubis for a few seconds as her tongue danced around the hard cock, massaging it lewdly. She then began to move her neck, letting the stiff member fuck her mouth and gullet.

Twilight watched the flushed and needy look Celestia gave her as she shook her head trying to pleasure her.

“Princess…”

She felt weird seeing how her mentor had her head stuck between her own legs. She didn't even remember ever having her own gaze above hers. The whole situation made her feel strangely powerful. Powerful and horny.

Almost unconsciously, Twilight placed a hand on Celestia's head and assisted her with her movements, causing her throat to fuck her cock more intensely.

Celestia offered no resistance, letting her student go with the flow. Twilight's precum was starting to ooze profusely, and she was swallowing every drop of that stallionly scent.

After a few minutes of sucking, Twilight felt her climax imminent and she cupped Celestia with both hands, using even more force to carelessly fuck her throat.

“Prin-Princess...!"

Twilight reached her peak and expelled her cum while pressing Celestia's head hard against her crotch. If her ejaculations had been abundant during her first night with Pinkie, after that event her discharges had increased in volume even more. The copious volleys exploded inside Celestia's jaws, causing her cheeks to swell, but she managed to hold back the torrent and swallow every last drop of the virile paste.

Once she finished, Twilight let go of Celestia's head and dropped her back onto the couch, panting. However, it didn't take her long to turn her attention back to her mentor.

“Princess celestia! Are you okay?” Twilight asked with concern. “I’m really sorry! I got carried away and…”

As soon as she heard Twilight's urgent voice, Celestia reared back, pulled the generous cock out of her mouth with a loud plop, and licked her lips to clean the remains of cum.

"My sweet little Twilight is really productive," Celestia replied with an innocent smile. “Do not worry, dear. This old mare needs a little excitement from time to time.”

“But you are not old…”

“I'm over fourteen hundred years old, Twilight.”

The unicorn looked at the soft, delicate features of her teacher. She may have been a millennial creature, but she didn't look more than forty years old.

"Y-You know what I mean," Twilight murmured.

"My loyal student, always so formal," Celestia replied with a glassy, motherly giggle. “And yet, quite an alpha when it comes to sex.”

Twilight blushed deeply and tried to reply, but she only managed to mumble unintelligibly.

Celestia ignored her student's attempts to retort and lowered her muzzle again to delicately lick at the semen leftovers that still remained on her still-stiff phallus. Once she finished, she raised her head again.

"I see you haven't had enough yet," Celestia said as she took Twilight's rod with one hand and moved it from side to side. “You are still very hard.”

"I… Could you use…?" Twilight stammered, thinking her request was going to be too bold. “Could you use your… breasts?”

Celestia could see insecurity in her student's flushed features, but there was also longing in her eyes; she was desperate to satisfy her own sexual appetite. It was no wonder Twilight had a thing for her boobs, because they were without a doubt the most remarkable part of her body. Twilight would never admit it, but Celestia was very aware of the deep fascination her student had with her boobs since she was very young.

"Yes, I could…" Celestia answered, still smiling.”But I have a better idea.”

The Princess rose from the ground and her horn lit up. Using her telekinesis, she stripped off her crown, her necklace and the rest of her golden jewelry and placed them on the tea table. Then she unzipped her dress and slid it down her curvaceous body to the floor.

Twilight, still sitting on the couch, gaped at the stunning half-naked figure of her tutor. The only thing left were her pink bra and panties.

It wasn't the first time Twilight had seen the princess in her underwear, or even naked. Just as Celestia had explained, the two of them had a habit of taking baths together when Twilight was younger. She had always marveled at the princess's gigantic bust, although she had more innocent reasons back then. And although when she reached her adolescence, she already saw Celestia's body in a different way, she never had lascivious thoughts about her. Or at least not as lascivious as the ones that ran through her mind that day. Considering her recent changes, she was sure her new stud parts had a lot to do with that.

Still, Celestia's gigantic, curvy body commanded the attention of anyone, mare or stallion, pony or otherwise. Her colossal bosoms, pressed tightly by the bra she was wearing, were even larger than Fluttershy's, though proportionately they may have been a bit below her. Her wide thighs and thick ass, without being exaggerated, gave her a maternal figure very much in tune with her voice and personality. All that added to her seven feet four height and her provocative way of dressing, made her become the spotlight wherever she went. She certainly shone like the sun that represented her cutie mark.

"Instead of me using my body to please you, I'm going to let you use it," Celestia explained as she walked over to her student and took her hand. “Come here.”

Twilight got up from the couch, letting herself be carried by Celestia's soft hand like when she was a filly. They both reached the huge royal bed and the Princess sat on it. Twilight stood motionless, her cock still erect and lifting her purple skirt.

“S-So… you want me to take the initiative?”

Celestia nodded. “That's right, my dear student. Let yourself go.”

Twilight sighed and showed a determined expression. “Okay.”

Without further delay, the unicorn got rid of her skirt, blouse, panties and bra using her magic, leaving her completely naked. She then jumped on the princess, causing her to fall backwards onto her bed. As she laid on top of her, pressing her more than decent D-cup to her massive breasts, she used her hands to insistently massage and squeeze her mentor's mounds, moving them from side to side.

She hadn't felt the soft touch of those colossal boobs in years, and hadn't realized until that moment how much she missed them.

The princess's fine lingerie still prevented full access to every inch of those breasts, so Twilight ran her hands up Celestia's back and unhooked her bra in one quick motion, then removed it to free her glorious mammaries. An even greater hunger filled her at the sight of the Princess' huge pink nipples, causing her to lick and suck on one of them while she pinched and tugged on the other. Celestia couldn’t help but moan in response.

“Oh yeah! Use my boobs *aah* as you please, my loyal student,” Celestia managed. “They are all for you.”

Twilight took those words as permission to squeeze and suck on those nipples harder, rubbing and massaging them nonstop. Celestia, far from complaining, hugged her student's hips to assure her that she was doing a good job. However, the unicorn, full of lust, soon decided that this was not enough; she pulled the nipple out of her mouth and released the gigantic breasts, causing them to sway salaciously. One of her hands returned to her vascular tool, fully erect and ready for action.

"I-I can't take it anymore," Twilight said in a demanding voice. “I need this, Princess.”

Desperately, the student dropped her cock onto her teacher's sternum and used both hands to cup her colossal tits and cover her stallionly member with them completely. Driven by her instinct, Twilight held them tight and began to move her hips, uninhibitedly fucking the fat mounds. The pleasure was so intoxicating that thoughts other than carnal barely had a place on her mind.

“Yes! Fuck my tits, Twilight!”

With each push, the mammaries devoured the unicorn's rod entirely. They were so big that, despite Twilight's respectable size, she wasn't big enough to break through them. Little by little, her movements picked up more speed. Sweat began to break out on her forehead as licentious moans escaped her mouth and a burning heat coursed through her body.

Celestia, for her part, slid a hand to her own crotch and slipped two fingers under her already damp panties to rub herself. The harsh treatment she was receiving from her virile student was turning her on much more than she had initially realized. She tried to keep up with each vigorous shove thrusting index and ring fingers up to its knuckles as she growled fervently.

Seeing her climax approaching, Twilight redoubled her efforts, making shorter but much faster strokes, fucking her tits like a purple blur as her moans went higher and higher.

"Prin-Princess!"

As soon as she exhaled that cry, the first rope of semen came out from between Celestia's boobs, permeating her face and neck. Her stud scent filled the monarch's nostrils as Twilight spurted more and more cum onto her face, marking her like her property.

At such a display of dominance, Celestia couldn't help but cum too, drenching her panties and fingers lavishly with her feminine nectar as she moaned deeply and babbled her student's name.

Once Twilight was done, she let go of her teacher's tits, making them slide down the sides of her torso, and revealing how well soaked they were. Her sticky cum made a copious mess on them and Celestia’s face and mane. The volume of her climax during her first night with Pinkie was nothing to sneeze at, but it had increased even more since then.

With the Princess still recovering from the high of her cum, Twilight, still panting and her mane scruffy, moved down from Celestia's torso until she settled on her crotch. She pushed her mentor's hand away, which was still firmly anchored to her cunt, then wrapped her magic around her sodden panties and slid them down her thick, curvy legs. Celestia, although surprised, did not put up any resistance.

"I'm… I'm so sorry, princess," Twilight moaned as she spread her mentor's legs and gazed anxiously at her large, swollen pussy lips. “I need more…”

After wiping the cum from her face, Celestia noted with surprise that Twilight was still fully erect. Maybe even more erect? And she didn’t even go through a refractory period! She bit her lip in excitement as she felt her student probing her pussy with her hard cock, impatiently waiting for an action, a word, a gesture on her part that would give her permission to proceed.

Celestia gave her a narrow-eyed smile. "Go ahead," she said as she relaxed her legs, “take me, my sweet Twilight.”

When she barely heard those words, Twilight thrusted hard and Celestia's pussy swallowed every inch of cock in one sitting. Although the member was slightly larger than normal, the princess's cavity accepted it without too much trouble. In response, Twilight pistoned her hard stallionhood without waiting another second. Her silky wet interior felt hot as an oven, and she felt the vaginal walls begin to constrict her length as if the princess was trying to milk all the cum she was preparing to give her. Celestia, for her part, clung firmly to the sheets of the bed while her disciple penetrated her with more and more force, causing a loud and lascivious plap every time her balls collided with her crotch.

Overwhelmed with pleasure, Twilight lowered her torso, laying on top of the princess's body and holding onto her lower back, giving way to shorter but much faster thrusts. Sweat was beginning to break out on her body, and her breathing was becoming more demanding and ragged.

"Twi-Twilight!"

Celestia hugged her pupil's neck, pressing her face against her tremendous breasts desperately as she came again. Twilight, far from slowing her pace, fucked her mentor even harder, willing to give her as much pleasure as possible, until she couldn't take it anymore and ejaculated inside her. Ropes and ropes of semen permeated the interior of the princess without Twilight stopping her pelvic movements. The torrent of her slimy seed, mixed with Celestia's slippery vaginal juices, began to gush out of the monarch's cunt, unable to contain any more. Twilight, however, didn't stop fucking her mentor, thrusting and thrusting nonstop, until, expelling the last drop of her, she finally ceased her pelvic movements and dropped her exhausted body on top of the Princess'.

After that thrilling dance, teacher and student relaxed their bodies, trying to catch their breaths and reveling in the dopamine coursing through their veins.

"My little Twilight." Celestia placed a hand on Twilight's head and gently stroked her mane. “You have done so well.”

Twilight, inert, responded with an almost inaudible babble. Celestia noticed that her eyes were closed and that she was snoring softly. The poor thing had given her all and was exhausted from the effort. They were still joined at their sexes, but Celestia didn't want to disturb her student. She had booked an hour of her busy schedule for Twilight and it still hadn't been three quarters of an hour. She could give her loyal student a five-minute break and then she'd get ready again to get on with her busy morning.

"Twilight... You still have so much to learn. So much to grow… I can't wait to see the mare you’ll become in a few years.” A mischievous smile spread across Celestia's face. “In the meantime, I think I should also get to know your friends a bit more intimately…”