A Thin Line

Night had long since fallen across Ponyville, and a curious event was taking place, hidden yet in plain sight.

Rarity panted into the night air behind her own boutique. She was splayed out on her back, nude and in plain sight aside from the cover of night and the fact that nopony ever walked around the back of the building. Her body was covered in a fine sheen of sweat, and her aching nipples pointed up towards the night sky, begging for somepony, anypony to tweak them or suck on them, even if it was just a little.

Even more curious was the sight of the pony in front of her, hands running up and down Rarity’s thighs with her head buried between them. It was a familiar cyan-coated Pegasus, dutifully servicing the unicorn’s luscious folds with her agile tongue.

“Rainbow Dash always was the best at licking.” Rarity thought to herself, but her thoughts were quickly cut off as Dash nipped at her now-exposed clitoris and sent her reeling in pleasure, her back arching and thrusting her melon-sized tits skyward. "Mmmmm, and she still is." She was nearing her fourth orgasm of the night, and she was sure she had given at least as many to Rainbow earlier. The thought only made her hotter.

“Ooh, OOOooohcelestia Dash, please don’t stop!” Rarity managed to gasp out.

“Mmmph!” Was Rainbow’s response.

Rarity's nipples were aching even harder now, and she wanted to send a signal to Dash to lavish some attention on her breasts, but every time she tried she was... distracted... so, the situation being as it was, Rarity reached to her breasts with her own hands and started fondling, occasionally licking the upper half of one in her lust-induced haze.

In one glorious moment, Rarity tweaked both her nipples at the same time that Dash decided to graze her clit with her teeth, and it nearly sent her over the edge. Rainbow paused in her ministrations and lifted her muzzle from between Rarity's thighs, her face dripping with cum and a blush spread across her cheeks.

"You really liked that, huh?" Rainbow asked rhetorically, and then dove right back in.

"MMMMmmm, aahhh, YES, Rainbow, that's EXACTLY what I like!" Rarity answered anyway, though not consciously. Her mind was overcome with pleasure as Rainbow relentlessly assaulted her clit, and Rarity couldn't help but cum in a mess all over Dash's face.

Dash finished up, licking a few more times and earning some moans from Rarity in the aftermath, then began to crawl up her body, lavishing attention over her curves with her hands along the way, before meeting their lips in a passionate kiss at the apex of her ascent. Rarity tasted her own cum on the mare's tongue, and it served to be slightly arousing but, judging by the slowing actions of the mare making out with her, they were both ready for bed.

They rose slowly from the bushes, holding each other's hands, and quickly peaked around to ensure no one was watching before quickly dashing to the doorway of the boutique around the other side. They had shredded or otherwise destroyed their clothing at some point during their love-making, but that didn't bother Rarity much. She loved finding excuses to make new outfits.

They trudged up the stairs to Rarity's room and flopped their sweaty bodies down onto the bed, too tired to bother themselves with a shower. Rarity knew all of their other friends were in similar situations now, cooling down after a night of passionate love-making.

In the warm afterglow of sex, Rarity's thoughts always turned to her friends, and the wonderful history they shared that led to moments like these. All the fun and trials alike that had strengthened their bonds of friendship until they were something that was, just maybe, beyond friendship.

Where Rainbow Dash was out near instantaneously, snoring lightly, Rarity lightly drifted off to sleep, a smile on her face.

Her dreams told a tale of the past.

Rarity was busy at work in her personal inspiration room. Everything was layed out perfectly for her next ensemble, and all she needed was the finishing touches to make it truly complete. While the stitching was easy and the colors had been specified in the order, she found that the embroidery was proving to be very difficult to pull off. It had seemed like a fantastic idea at the time, but when she actually sat down and got to work on her brilliant new embroidery design, she found herself regretting the decision.

As she began to pattern out the last frustrating section of the over-complicated design, she heard somepony knock on her door downstairs.

"I'm busy, but you can come in if you'd like!" She shouted down. The distinct sound of the Boutique's front doors opening and closing could be heard.

Rarity had finally finished her design just as she heard the hoof-steps of her visitor ascending the stairs, making a beeline for her inspiration room. She turned, took off her signature red work glasses, and did a once-over of herself just before her guest entered. While she was dressed in her work clothes, consisting of a plain white shirt that blended nicely with her coat and blue-jean shorts, she assumed she was presentable enough for anypony that was apparently familiar enough with her to risk coming straight into her inspiration room on short notice. When the door opened a smiling Twilight Sparkle greeted her.

"Hey Rarity! I know you're busy, but I'm kinda excited to deliver these to all of our friends around Ponyville." Twilight indicated the objects in her hand; envelopes with custom designs and emblazoned with each of their cutie marks.

Ever with an eye for fashion, Rarity appraised Twilight's apparel: Typical pink accented shirt with a purple vest to compliment her colors, and long blue jeans for a classy look. It seemed they had a similar fashion sense today. "Oh, it's really not a problem dear. I was just finishing up, as it were, and was simply planning on shipping my latest creation to Canterlot for review." Rarity said as her eyes spotted the white envelope with her mark on it and her horn lit up to pluck it from Twilight's fingers.

"Oh, well, that's great then! I wanted to let you know that I'm hosting another slumber party, and I can only hope that it'll be as fun as our first one! I know that it started out rough, but I think we worked everything out, and I took detailed notes and used them to draw up a detailed outline that will ensure we have fun this evening!" Twilight looked like she wanted to continue, but Rarity cut her off.

"Twilight, dear, you mean this evening? As in, this evening, this evening?" Rarity replied, stymied by the thought of delivering invitations for a party later that day. Sounded more like something Pinkie Pie would do.

"Yes, of course this evening! Spike's away on royal business in Canterlot again, and that made me think of our first slumber party, and the memory made me want to try it again! Of course, it'll be a little different this time with everypony there, and I'm still working out sleeping arrangements, but I'm sure we can have just as much fun this time as the last time!" Twilight had an undeniable shine in her eyes, and her joviality was infectious.

Rarity smiled.

"Alright, Twilight, I can be down there for tonight, I'll just need to close up early and plan on what to wear for the occasion." Rarity said half to herself.

"Oh that's actually a point that I forgot, but thanks for reminding me. You should wear something that you would be fine falling asleep in. My research shows that ponies often fall asleep at a good slumber party without notice, since they go well into the night, so keep that in mind when you choose something to wear." said Twilight. She clearly had this planned out.

"Of course, I'll be sure to keep that in mind." Rarity replied

"Thanks. Well, I've got to go and deliver the rest of these invitations, and you need to get ready. Details are on the card. Bye!" Twilight quickly rattled off before her horn shined and she teleported in a flash of pink light. Rarity looked out the window of her inspiration room and spotted an excited looking Twilight running away from the boutique in the direction of Sugarcube Corner. She couldn't teleport onto property that she didn't own without permission, anyways. That was against the law.

Now left to her own devices, Rarity had time to peruse the invitation and really think about Twilight's request. Of course she was going to go, but she still wanted more details on what exactly it was that she had agreed to in the heat of the moment that was brought on by Twilight's infectious giddiness. Looking over her customized invitation, written in an elegant script, she gleaned that she was cordially invited to Twilight's slumber party this afternoon at 7:00 pm, and that she was to enjoy herself, especially the "surprise" that was mentioned. Rarity didn't know what this surprise was, but she knew that Twilight wouldn't do anything without conducting extensive research before-hand. The preparations for this party alone were testament to that fact.

Rarity set about trying to find something to wear for her soiree at Twilight's house, which she was sure could take up the rest of the day until then. She quickly ran downstairs to set out her "closed" sign and then ran back up into her room, where her wardrobe was.

She thought about what she wore to bed, like Twilight said, and then blushed as she realized that she usually slept nude. Opting not to show up to Twilight's house naked, she instead rifled through all of her possible outfits that could even have a slight chance of suiting the occasion. There's no such thing as bad ideas when you're brainstorming, Rarity told herself.

Throughout the day, many outfits went on and came off as she tried to mix and match different pieces to create the finest piece of nightwear one could possibly imagine without making a new one herself, of course. Her outfits ranged from the elegant and flowing to the risque and revealing, but the final decision clearly lay somewhere in between. This was an informal party, and it was with only her close friends to boot, so she should dress in a way that errs on the side of casual, but begets a certain air of refinement. She settled on a simple purple midriff and purple panties that complimented her mane and tail, not to mention each other. While their design was understated, their materials were very rare and expensive, which gave an aura of elegance to their simplicity even to the untrained eye.

Before she knew it, the time of Twilight's slumber party was already nearing, and Rarity had to quickly check herself in her bathroom mirror to ensure she looked stunning. After all, wasn't it her friends who deserved the best?

Rarity set out for Twilight's place clad in her night-wear. Since Equestrian society was relatively loose, almost any apparel was suitable for wearing outdoors so long as the naughty bits were covered. While Equestrian law didn't exactly preclude public nudity, it was still rare to see, and generally frowned upon. In any case, few ponies were out at this hour, and none batted an eye at her outfit, though a few ponies did glance at her a few times, apparently stunned by her beauty. She had brought nothing else with her, as the invitation had requested, and was fully prepared to experience the fun Twilight had planned the way that she meant for it to happen. Lost in thought, she hardly noticed she was already at the front door until she practically bumped into it.

Composing herself, Rarity spoke "Twilight, I'm here, may I come in?" She knocked lightly a few times to emphasize her presence. There was no answer. After waiting a few minutes, impatiently tapping a hoof, she finally rationalized that she was a friend and it was fine to walk in on short notice. Twilight had just done the same to her earlier today, after all.

Rarity stepped in and was greeted with a Library that was re-appropriated into a plush and inviting dimly-lit room that could seat six ponies comfortably with room to spare and a snack bar was already laid out against one of the walls. Rarity knew first-hand that Twilight was a poor cook, so she reasoned that she must have ordered a pre-fabricated party set or done something with her magic.

Seeing no sign of Twilight, Rarity ascended the stairs, making the clopping of her hooves against the wood more apparent so as to avoid startling the poor dear. She quickly came across the door to Twilight's room, which was closed shut, and without thinking opened it.

Twilight stood there, naked, with her back turned and was rifling through her own wardrobe, fretting about what to wear. At the sound of her door opening, she turned and spotted Rarity.

"Oh, Rarity! Sorry, you spooked me!" said Twilight.

"My apologies, Twilight, I didn't realize you were still getting dressed, I'll just take my leave -." Rarity began

"No, no that won't be necessary. I was actually hoping you might help me pick out something to wear? I'm not sure how one dresses for these things, since I've never done much with social gatherings, and I usually sleep, well, you know..." She trailed off.

At the sound of Twilight saying she wanted help with something to wear, Rarity perked up. "Oh Twilight, of course I'll help you decide what to wear! Just you wait and I'm sure I can find something in your wardrobe that will look simply ravishing!"

"Thanks, Rarity. I hope it's not awkward in here with me, but I figured 'hey, we're all mares here,' so... yeah." said Twilight.

"Anytime, dear." Was Rarity's only reply, and then she set to work looking through Twilight's clothes. While she had a relatively sparse collection compared to Rarity's own, it was actually one of the more respectable wardrobes in Ponyville, and certainly the best aside from her own among their circle of friends. Occasionally, Rarity would glance back at Twilight, who was simply waiting patiently. She once thought she caught her staring, but she often thought that with her being so beautiful, so she figured it was simply her instincts saying somepony was watching, without any real evidence. Finally, Rarity found the outfit for Twilight to wear tonight: a two-tone blue and purple midriff with simple white panties. While it wasn't perfect, it was the best she could find without running home and giving Twilight some of her clothes.

Rarity walked over to Twilight and got down to her knees. Twilight realized she was offering to put the clothing on for her and blushed a little, but turned around to hide it. She lifted first one leg and then the other as Rarity reached down to pull the panties up her slender legs.

Rarity couldn't help but admire her friend's figure as her white fingers grazed against the soft lavander fur. Her naturally thin frame was offset by her sedentary lifestyle, which gave her some needed fat, and she clearly exercised occasionally in order to stay healthy, which showed especially in her flanks. Rarity was drawn to Twilight's rear as the panties slid up to it, and she felt something stir inside her when she looked at it. Twilight had lifted her tail earlier in order to keep it out of Rarity's way, so her cute butt was on full display for the seamstress. She noted how it was... what was the term... tight, was the word she would use, tight. It was cute and not too flat nor too pronounced, and Rarity could spy just a hint of her marehood peaking out...

"Rarity, is something wrong?" Twilight inquired.

That snapped Rarity back into reality quickly. She just realized that she had been staring at her friend's butt for at least a full minute with the panties held still around her thighs. Rarity quickly pulled them all the way up with a blush, then stood as Twilight turned to face her.

They were about the same height, much like the rest of their friends, and Rarity couldn't help but get an eyeful of Twilight's breasts as she rose. They weren't quite as big as her own FFs, but not many were. Twilight's were actually very respectably sized, being about D-cups, and they suited her frame very nicely. Rarity managed to snap herself out of it without Twilight's prompting this time, and looked up into her eyes.

Twilight was staring, confused.

Honestly, Rarity was just as confused. She'd never been really attracted to any mares before. She tried to think of stallions, especially one with a winning attitude unlike that boor, Blueblood, and she was still attracted to the idea. It's not like she was a filly-fooler...

"Uhm, Rarity? You wanna put on my top now, or do you need me to do it?" Twilight questioned.

The tension in the room was thick. Any moment one of them would do... something... and it wasn't going to be pretty. Wordlessly, Rarity handed the top over to Twilight and quickly took her leave of the room. As she descended the stairway, however, she failed to notice another presence that had already begun to occupy the main lobby.

"Hey Rarity! Where's Twilight? I've got just the thing to start this off, and I know it's gonna be so much fun!" It seemed the pink ball of energy had just arrived.

"Sorry, Pinkie, but I believe Twilight has this evening mapped out already. I wouldn't recommend getting in the way of her plans. You know how she gets sometimes." Rarity replied, a blush still on her face at the thought of her recent encounter with Twilight.

"Oh Rarity, you're probably right. I should trust that my friends probably know what's best!" Pinkie replied, not letting Rarity's shutdown bother her at all. "Oh, by the way, the others should be here shortly. I delivered the invitations myself!"

Rarity found herself distracted by Pinkie's bouncing. She wore a simple thing that looked like a blue two-piece bathing suit, and there was clearly nothing to support her bouncing D-cups, the same size as... Twilight...

"uh, Rarity? Helloooooo?" Pinkie broke Rarity out of her third trance that evening.

"Uh, yes, I'm happy Twilight found a way to deliver the invitations and still had time to prepare the party. I'm sure she's very grateful for your help." Rarity quickly replied. This seemed to please Pinkie Pie, who went about inspecting the party and all the amenities it had to offer.

Rarity's thoughts, on the other hand, turned inward.

"Why would I be having these thoughts now? I don't feel the same way about other mares. Why, I just had a spa treatment the other day, and I wasn't feeling like this then!" Rarity thought to herself. It was almost like she wanted to hug Pinkie... or Twilight... or whoever! but it was stronger than that. Rarity knew about kissing and romance and even a few of the smutty details, but these feelings were still new to her, and she was unsure how to act upon them, or even if she should act upon them, especially with one of her close friends.

Luckily, distraction from her own thoughts came in the form of a loud group of mares entering the room at the same time. Well, it was actually a scantily clad Rainbow Dash and Applejack having some sort of physical confrontation while Fluttershy walked nearby in a night gown, trying to calm them with soothing, whispering tones. Twilight had just descended the stairs, now with her top on.

"Alright, everypony, looks like we're all here. Now we can move to step one on the checklist, and Pinkie's favorite game: pin the tail on the pony!"