A Thin Line

The Elements of Harmony and the Princess of the Night exited the shower, refreshed and rejuvenated by having their bodies cleansed. Washing each other had put them in a bit of a playful mood, and they were probably just a bit horny, but it was manageable. Besides, nopony wanted to ruin the emotional control that Luna had so ardently praised them of possessing. Smiling and laughing, speaking to each other of trivial things and referencing the kind of in-jokes only a close-knit group of friends can form, they set about getting dressed.

At this point, Rarity, Twilight, and Luna all realized they didn't have any clothing to wear, or at least not anything that was readily available. They would need to return to their rooms to get some of the extras provided to them.

Twilight had been preparing a group teleportation spell, in order to avoid the errant gazes of the castle staff, but then Luna interjected her casting with an interesting proposal.

"Actually, Twilight, I think we are all well aware that there aren't exactly any rules about walking around without clothing. Maybe we could... enjoy a walk to my practice chambers?" She smirked. "You and Rarity can come with me, the rest of you can use the Gym reserved for the Royal Guards in the mean-time. After all, you'll need some training if you are to travel to Stalliongrad and handle the changeling threat, correct?" Luna had a good point, and served to remind them of their true purpose for going through all this. Everypony agreed with her that it was a good idea to spend a bit of time apart and hone their skills.

Rarity's heart was beating quickly. She'd never been very physically or magically strong, but that wasn't her problem. She was about to walk around Canterlot Castle naked! It wasn't like Ponyville, where it actually happened occasionally and was generally written off, this was Canterlot. If she were seen, why, the wrong pony spotting her could send her career careening into ruin! Luna noticed her very visible distress.

"Why my dear Rarity, do not be so anxious. Thou hast a wondrous body, I'm sure even the royal guards will be jealous. Besides, we will be going through some deeper areas of the castle, so we should only encounter the errant patrol." This served to quell Rarity's fears, a bit, but there was still the chance of being seen...

Before she knew it, the other mares had already opened the doors and exited the room, leaving Rarity to snap herself back into focus and scurry out after them.

"Well, here goes nothing." Rarity thought.

Luna was leading the group, strutting forward in her fully bared glory with pride, apparently enjoying the experience thoroughly. Twilight herself began meekly walking beside her, but began warming up to a conversation about magic Luna had begun, seeing her distress. Rarity had planned to use her more clothed friends as cover, but unfortunately the rest of her friends had already turned off to the side, entering into a large looking room with all manner of exercise gear and weight-lifting equipment.

Rarity had no qualms about showing off her body to her friends; in fact, it would be a lie to say she didn't derive quite a bit of enjoyment from it, but she felt that propriety demanded she at least cover up in front of strangers. The few guards they passed made her slightly nervous, especially since some of them gave her extended gazes, the usual stare and appraisal of her beauty combined with a look in their eyes she had previously only seen worn by her friends in the heat of passion, now that there was no clothing to mask her luscious curves. It was a raw reaction to a raw presentation. Primal. Instinctual.

Natural.

This realization served to calm Rarity, if only by a little. If this was natural, for ponies to feel this way, then why should she fear it? There was still some lingering doubt, but it had been quelled for long enough that she felt she was able to focus on something else for a while.

Twilight was in full magic nerd mode, regaling Luna with her discoveries and experiences of magic in all its forms. It seemed to serve a suitable distraction from her unclothed state, and Twilight still appeared to be the same bookworm they all knew and loved. Being fully nude in the middle of Canterlot Castle hadn't changed that. Having sex just the previous night with the Princess she was talking to now hadn't changed that.

They shared a deeper bond now, but that was just it. Their bond was deeper. It didn't come at the expense of other facets of their relationship, but rather had made that relationship more meaningful, more beautiful. Their interactions were now laced with the undercurrent of a new emotion and experience that each knew the others shared. Rarity felt the potential for expressing herself in this new way every time she talked with her friends now, but it wasn't overpowering anymore without the magical lust of the Elements influencing her. They were all in agreement, they all enjoyed each other's company, and they all wanted it. Just the increased potential had made them all closer, something more akin to cousins, but without the familial restrictions.

There were no restrictions between true, true friends.

During her ruminations, Rarity failed to notice a purple door that had swung out from the side of the hallway just as she was passing by it. The situation being as it was, the door collided with Rarity rather forcefully and knocked her back, sending her down to her flanks. In a confused daze, she brought a hand up to her forehead, then heard cries of distress that sounded vaguely like Twilight and Luna calling out to her, asking if she was alright. A deeper, but still feminine sounding voice came next.

"Ma'am, are you alright?" Asked the voice.

"mmh, I think I'll be alright, just... give me a minute to find my bearings..." Rarity replied. She looked up to see a mare in golden armor, her helmet off and held to her side, with the other arm extended towards Rarity, a hand offered as if expecting Rarity to take it.

With a blush, Rarity realized that she was supposed to take it, and reached out her arm to allow the guard to help her up. It wasn't common to see mares in the guard, but times were changing, and mares were taking traditional stallion jobs even while stallions were occasionally moving up and getting management positions.

Rarity took a moment to appraise her savior (well, and her aggressor, but who was keeping score?). Most of her body was hidden under plates of golden armor, but her face was very pretty with the helmet off, and one could see that her coat was a fine grey color, not uncommon for a member of the palace guard.

The other mare appeared to be eyeing up Rarity's nude body with confusion, but there was also a hint of something else. Something similar to that smoldering gaze the stallions and her friends had been giving her. It had to be her imagination that she was receiving those kinds of looks from these ponies. They didn't even understand what sex was yet, right? Why should they feel -

"Mmmmmph!" At that moment, Rarity's thoughts were interrupted by a pair of firm grey lips meeting with her own. She heard a clang as the guard mare's helmet fell to the floor, forgotten, freeing up an arm to wrap around Rarity's waist and pull her closer. While it was rather unexpected, she found that she wasn't entirely against this turn of events, and simply let the kiss continue unabated. She began to get more into it, and tilted her head sideways to change it from a rather innocent kiss into a more intense make-out. The other mare seemed to be surprised, and used her greater strength to pull them apart, a strand of saliva between them.

Rarity's allowed her eyes to assume a half-lidded demeanor, and said, in her huskiest voice, "Thank you, very much."

"Mmm, my pleasure." Replied the guard with a smile. Stealthily, the grey mare fished a small, folded up piece of paper out of her pocket and placed it into Rarity's hand, who noticed it and clenched. "All in a day's work." And so, with a glance at their audience of two, blushed as if realizing what she had just done and left.

Rarity, still half in a daze from the rather odd events that had just transpired, looked over to the lavender mare and the lunar princess. Twilight was looking with a soft smile and a blush, her expression making her seem both happy for her friend and slightly embarrassed something like this had happened on such short notice, likely trying to be sympathetic with Rarity's confusion. Luna, however, looked extremely pleased with the recent events, a huge grin on her face that made her seem almost... proud?

"My my, Rarity, I knew you had mastery of the art of seduction, but never did I think you could have a mare who didn't even know what sex was kiss you with but a single exchange of words." Luna praised. "Do you practice, perchance?" She asked.

"Err, actually, I do not, Princess. I just let it happen naturally." Rarity replied sheepishly.

"Wait, you mean to tell us that we were seduced in your room the morning previous by a mare with no formal training in seduction? My, you are quite the natural, my subject. Perhaps you can even teach me a thing or two about how to get a pony into bed." Luna licked her lips and smirked at that last suggestion.

"Um, well, I'll keep that in mind, Princess." said Rarity.

They were about to continue on when Rarity noticed the helmet still lying upon the floor. That mare must have left it here on accident in her embarrassed haste to leave.

"Well, this simply won't do!" Thought Rarity. "I'll have to return the helmet to her; I couldn't imagine somepony getting in trouble because of my beauty." And so she picked up the golden helm and tucked it beneath an arm. The metal felt slightly chilly against her bare skin, but her fur helped to insulate against the cold a bit. Luna noticed her actions and spoke up.

"I see thou now hast a trophy of thy conquest. Dost thou plan to keep it when you wish to, remember her?"

"Actually, I was planning on giving it back to her." Rarity was ready for that question.

"Aah, a good excuse for being able to meet her in a more private setting, even better!" Luna's grin was positively enormous. Rarity simply blushed with a soft smile. She may have been fantasizing just a bit about how returning the guard's helmet would go. After a kiss like that, could anypony blame her? Twilight, who had been quiet throughout most of this, finally spoke.

"Rarity, I think it's sweet of you to want to return the guard's helmet. She might get in trouble for losing it. I'm totally for you going to her quarters to return it." At this, she leaned in to Rarity's ear and whispered, "but, if anything does happen between you two, I want all the details." She licked her lips. "For research, of course." Twilight nibbled on Rarity's ear a little, earning a soft groan of longing. Rarity whispered back.

"Oh, Twilight, don't tease me, please? You know we can't -aah- do this now. We're in -ooooh- public, and don't forget Lun -mmmm- Luna's orders... " Rarity trailed off and let drool escape from her gaping muzzle as her brain shut off in response to Twilight gently licking and nipping at her collarbone. However, both to Rarity's relief and dismay, Twilight pulled herself away.

"I suppose you're right, Rarity. However, just remember that I'll be thinking of you when I relieve myself."

Rarity felt wetness begin to run down the inside of her thigh. The fires of lust had been re-kindled.

Luna had noticed them, and wore a knowing smile, like she had often experienced what they were now going through.

They finally came to the end of the hall and entered into Luna's private practice chambers through a large set of deep purple double doors. The walls were lined with shelves filled with a myriad of spell books and magic scrolls, serving to distract Twilight from her fervent heat for a moment. Rarity took a moment to place the piece of paper inside the helmet she was still carrying, opting to read the message and return the guard's helmet later, and set it on an unassuming looking desk near the entrance to the room.

Luna was still smiling.

"It is, perhaps, fortuitous that your lusts have been re-awakened for this lesson. I think it will make it much easier to teach the magical applications I am about to show you." Luna's horn began to glow, and a formless blob of dark blue magic appeared next to her. "This, I'm sure Twilight is familiar with, is a corporeal manifestation of telekinetic energy. It is infinitely malleable, limited only by the power and skill of the caster. A very useful and versatile spell, most unicorns will agree."

Rarity had to use everything she could remember from her magic classes to keep up with the Princess. She remembered casting the spell once as part of an exam, but had never found practical ways to apply it to her occupation, and had forgotten it since then. It was especially hard to pay attention now that she was horny, but Luna had hinted at how they were lucky that they were horny, and that thought kept her focused throughout the lesson. She looked over to Twilight to see that she was rapt with attention, clearly enjoying having magical instruction from a Princess, even if it was likely basics for both of them.

After Luna's rather technical explanation on the theory, she allowed Twilight and Rarity to give the spell a shot. Twilight's horn glowed and a formless pink mass of telekinetic energy appeared next to her almost instantaneously, as expected. Rarity had much more difficulty, and seemed only to be able to form smaller masses that fizzled out when she tried to force them much larger.

If Rarity could simply form it into smaller pieces, like she was accustomed to working with... and her new theory worked! She simply needed to create many smaller masses and ultimately combine them, rather than force a large (by her standards) mass into existence.

"Ha! Still got it!" Rarity exclaimed with pride. She earned a round of lighthearted clapping and "Yay!"s from Luna and Twilight.

"Excellent work, my students. I knew I was working with a powerful unicorn when dealing with Twilight Sparkle, but it seems fair Rarity is quite above the average unicorn as well." Rarity blushed at the layered compliment.

"Well, I did take some advanced magic courses, and passed them rather well, but I've simply been out of practice for so long, I'm surprised I could keep up with you during the explanation, honestly." said Rarity.

"Well, I am glad you have both a good understanding of the basics and have even gotten into higher level magic, as some spells may become complex later, but today's magic lesson will simply be an exercise in power. I want you to re-shape your telekinetic masses into rods, preferably of decent thickness." said Luna.

Twilight once again proved to be Rarity's superior magic-wise, as her telekinetic blob quickly re-formed into a thickened shaft, maybe a little over a foot long.

Rarity was, again, having some difficulty. She could make a long rod-like shape, but it was thin like a pencil. Any attempts to increase the circumference ended with it snapping back into place; she couldn't get the changes to stick. Rarity wracked her brain for ideas, and the solution finally came in a form similar to her previous one. She simply formed more magical blobs using her previous method, surrounding herself in an impressive looking field of blue light motes that congealed into multiple formless masses, then reshaped those into more spindly rods. Finally, she magically "glued" her magical structures together and finally ended up with an approximation of what Twilight had made.

"Ingenious, Rarity. Your reputation as a creative designer is well earned. It seems you have quite a bit more ease in handling lesser concentrations of power, but you seem to have no problem with controlling many separate magical fields at once." praised Luna.

"Thank you, Princess. While I'm no Twilight Sparkle, I certainly have developed a few tricks. I was always complimented on my ability to carry many objects at once in multiple telekinetic fields." replied Rarity. She thought back to the time she ran into Fancypants. Just before that, she had been levitating no less than six large bags full of dress-making supplies.

Now with their rods magically constructed, they were left to ponder their purpose. Clearly, Luna was trying to teach them something, but it must have something to do with the rods themselves, not simply their creation.

"Now then, my fine mares, this exercise will be an education in sexual experience. You and all of your friends have shown great promise and creativity in the art of the flesh, but that is only through your new discovery of sex between mares." Rarity and Twilight sat rapt at attention, and already felt they had an idea of where this was going. "I am hoping to teach you in the more traditional style, though I believe it is best to ease you in, so it will be just us mares for now." Now, Twilight was absolutely sure of what the Princess wanted from them, and Rarity wasn't too far behind in understanding. They were both getting excited.

"Here is how we shall do this. You will both find cushions scattered throughout the room with which to sit upon, spread your legs, and face one another. Position your magical rod in front of your partner's marehood, and thrust rhythmically. This exercise, while only an approximation of the real thing, should still significantly decrease any apprehension or surprise you might have when coupling with the opposite sex."

They understood. This lesson was a simulation of sex with a stallion, and it would likely prove to be important in the near future, when they may be dealing with changelings that had the ability to assume any gender.

Rarity and Twilight took their positions opposite from each other, maybe about a meter's length apart, and set an elongated magical rod pointing towards their partner's vagina.

"Partner, I like that term! After all, we are certainly more than friends... right?" Rarity thought.

They were both already visibly aroused, their nipples hardening and pointing towards each other even as their marehoods began to glisten with the natural lubrication being produced from deeper within the cores of their bodies. Rarity could see, now, that the purpose of these fluids was indeed likely for making the vagina more accommodating for a rod or other object of the sort. Well, that's as much of a purpose that she could glean aside from the fact that it made sex way sexier. Luna's voice sounded, interrupting her thoughts.

"Ah, I almost forgot something important... consider the ban on sex between each other lifted."

Rarity and Twilight were ready, they needed no further incentive. They plunged their magically created rods into one another's soaking marehoods, letting their warm, wet folds envelop the objects invading them.

"AAAaaahhn!" They cried out in unison. The experience was like no other. The initial thrust had been quick, catching both of them by surprise, and causing them to falter a bit, leaving the rods half-buried inside them. Rarity could feel every inch of the tingly, magical shaft as her vaginal walls clenched around it, practically begging for it to be drawn in further. Luckily, they both recovered at nearly the same time, and delivered on their desires at just the right moment.

The pink, glowing rod proceeded to bury itself further within her dripping folds, eliciting anything from soft moans to shrieks of satisfaction as it passed particularly sensitive nerve clusters. It wasn't quite as viscerally satisfying as being licked, but she couldn't deny the feeling of contented fullness she got from having a relatively thick shaft like this buried so deeply within her body.

Eventually, the shaft was all the way inside of her, not a hint of it peeking from her outer lips. She looked over to see that Twilight was in a similar situation. They looked to Luna for positive reinforcement, but they saw that she was seated on a cushion a few meters away, her eyes closed, legs spread wide and a hand working the dripping folds between her thighs. She wouldn't be of much help to them anytime soon.

"Well," Rarity thought "I suppose that's one way of expressing your approval." She chuckled inwardly.

It came as a surprise when she felt the shaft beginning to withdraw, almost disappointingly, but she quickly emulated Twilight's actions. She figured that she might as well follow along with the bookworm here. She might at least have a slight clue of what they were doing.

Suddenly, just as the magically crafted rod was about to exit Rarity's marehood, Twilight quickly thrust it back in with a powerful display of telekinesis, instantly burying it deep within her once more. Rarity's mind flooded with pleasure as her first experience with a shaft inside her vagina was repeated, and then magnified as the sensations happened so much more quickly. She followed Twilight's lead, half of her actions being reflexive, but it elicited a positive groan from her partner none-the-less.

"Ah yes, Luna did say to rhythmically thrust, if I recall correctly." Rarity thought, but those thoughts were shattered once more as Twilight extracted and thrust the rod within her again, and Rarity tried her best to follow along. In a sudden, slightly competitive moment, Rarity didn't hesitate after her last thrust and simply did it again, making Twilight cry out even more loudly with pleasure. Rarity smirked and, before Twilight could recover, thrust the rod in and out again.

Rarity began to keep up a rhythm, thrusting in and out gently, but never stopping her motions, never giving Twilight enough time to recover and begin pleasuring Rarity in return, but she was having too much fun to care about that overly much for now. Rarity saw as the muscles of Twilight's abdomen visibly contracted, her marehood clenching in response to the rod pleasuring her body as if begging for more.

So Rarity gave her more, thrusting the rod into Twilight's dripping snatch even harder and adjusting the angle to hit her sensitive nerves more effectively. Twilight was nearly incoherent at this point, having degenerated into constant yelps and grunts of primal sexual satisfaction.

Finally, she came, a rather loud and throaty scream emitting from her mouth even as her lower lips let loose a deluge of fluids, soaking the magical shaft buried inside her and the floor beneath her. Rarity could almost feel through her magic the contractions of Twilight's inner walls as she rode out the intense climax. As the pleasurable spasms appeared to subside, Rarity steadily slowed down her movement of the shaft and eventually stopped it altogether, giving Twilight a moment to rest.

Rarity's nipples were hard as diamond, tingling with arousal at the incredibly erotic sight before her. She allowed a hand to rise and fondle a tit in order to help alleviate the feeling a bit. Twilight managed to recover surprisingly quickly, after such a dramatic display of erotica, and noticed how Rarity seemed to be uncomfortably aroused.

"Mmm, I'm sorry I couldn't tend to your needs as well, Rarity. I was rather... distracted." At this, Twilight began to work the shaft within Rarity, steadily pumping it in and out at a gentle pace with her magic, making Rarity gasp half with surprise and half with pleasure. "Please, allow me to repay you, with interest."

Twilight's eyes were half-lidded, a smoldering gaze of raw lust piercing into Rarity, exciting her more than she thought possible. It never ceased to amaze her how all of them, herself included, almost instantaneously became highly skilled seductresses when they were aroused. It almost felt like a skill they always possessed, or at least it did for her, but it had simply lied dormant for a long time, waiting for the opportune moment to be applied.

In a running theme for the day, Rarity's ruminations on their sexuality were interrupted as the tingly, magical pseudo-stallionhood burying itself repeatedly into her folds began to pick up speed. She was already worked up quite a bit, and felt that her first orgasm of the night wasn't far off. Rarity just now realized that she had been gyrating against the magical shaft, meeting each of its thrusts with one of her own. Well, just because she consciously realized she was doing it doesn't mean she had to stop now!

Rarity's climax was nearing now, and it took all of her willpower just to keep her body upright, constantly moving her hips in an effort to help the shaft delve even deeper into her folds with each successive thrust.

The effort paid off. Rarity had, if not the greatest, at least the messiest orgasm of her life, the cum trying to exit her vagina spraying out around the magic stallionhood that was still thrusting away, helping her ride out her orgasm for even longer. It was almost gross to her how much fluid came from their marehoods every time they came, though in the context of actually engaging in sex, it only served to heighten the experience through touch, taste, and even smell.

As Rarity came, they could hear that Luna was cumming with her, saying what sounded like "Oooh, by me, thou art sooo hot!" Clearly, Luna's dialogue was still sporadically shifting between archaic and modern. It was oddly gratifying to know that the Princess of Sex could clop at the sight of them making love.

Rarity sighed as her muscles relaxed, simply basking in the afterglow that always followed sex with her friends. The rod buried in her snatch still tingled with magical energy, but her senses were dulled and her body felt warm and happy, so she was sated for now.

She loved the way the rod had simply filled her, it was like a natural fit for her body. She supposed that might actually be the case, since Luna had expressed that she had never heard of sex between mares before, only with stallions and mares. If a stallionhood was as good as what she had just experienced, she supposed the ponies of the past hadn't really been deprived, but they had certainly missed out on something exciting and different.

Rarity's body had built up a fine sheen of sweat from her previous exertions, and the chill caused her to yearn for a warm body to press against. Seeing that Twilight was one of her best friends, she simply scooted on over to her back and wrapped her arms around Twilight's waist, inhaling the scent of her mane in warm, post-coital bliss. Twilight reached up and stroked Rarity's cheek behind her affectionately. She really enjoyed moments like these. Of course, the sex was absolutely amazing, but simply lying side-by-side afterwards was just as good in its own special way.

Twilight spoke softly, and Rarity tried to listen closely, only half-aware in a dreamy haze, but what she heard is not what she expected.

"I hope you've still got some energy left, because I've still got more things I wanted to try with you."

"Hm, what was that, Twilight? I'm not sure I can...-" Rarity cut herself off, realizing that she really was ready for another round. She had simply assumed that, with how physically exhausting sex should be, that she would be tired after having a rod rammed into her body for almost half an hour, but such was not the case. Fresh fluids continued to drip from between her thighs, and even the idea of prolonging their session was making her knees weak with lust. She supposed it was still the Elements exerting some kind of influence over them, but she hoped they could control themselves more effectively in the coming days. "Well..." Rarity trailed off, using a tone that made her sound like she was considering it.

Luna, who had been observing their behavior with a marked interest, chimed in.

"We, as Princess of the Night, declare that this is an excellent course of action. Thou will likely require as much practice as you can get, and, as they say, there's no time like the present! Besides, I would quite enjoy it if the show were to continue." Luna admitted with a smirk.

Twilight certainly needed no further incentive. She turned around so she was facing Rarity and connected their muzzles in a passionate kiss. Rarity's marehood instinctively contracted around the faux-stallionhood still implanted within her, and her non-verbal communication had apparently reached Twilight somehow, who began to move it back and forth once more. Rarity returned the favor, finding it much easier to focus now that she had prior knowledge of the new sensations.

There was so much more this time, with sweaty bodies sliding together, tongues battling for dominance, and thick, magic shafts bobbing in and out of the depths of their marehoods. Rarity cooed in delight as she saw Twilight's horn glow brighter, and that coincided with a greater feeling of fullness with each thrust her telekinetic rod made. Twilight was enlarging it! Nearby, they noticed that Luna had constructed a deep blue magical shaft of her own, opting to use her hands in order to plunge it within herself more directly.

In a brief moment of lucidity, Rarity realized what had been missing the first time around. There was no real physical contact, nopony to hold or caress or kiss, no body heat to provide warmth and comfort, there was only the tools of pleasure, and she had simply felt it.

This time, she was going to experience it.