Sunlight streamed out into the darkest recesses of the hallways in the celestial half of the castle. It was designed so that in daytime there would be no darkness, and everything would be subject to its healing glow.

"More like its harsh glare." Luna thought to herself. She had decided to travel to the wing that was set aside for the six heroes from Ponyville, and that, unfortunately for her, entailed being subjected to the bright and wondrous rays that characterized Celestia's half of their new castle.

Being the Princess of the Night, one could imagine that she was particularly susceptible.

Apparently, they were still asleep. Luna decided to check on how they were all doing, and entered the first door on her right leading to Rainbow Dash's room.

While she had been expecting signs of frustrated masturbation, she wasn't prepared for the sight within.

Before her, a nude Rainbow Dash was lying in a heap against the wall of her room, the one closest to Rarity's, she noted. She was surrounded by cushions that were clearly soaked through with her fluids, if Luna remembered anything about sex. The room positively reeked of her scent. It was unmistakeable that she had cum many times in this room. Perplexed, she went to check on the others.

The sights in their rooms proved to be even more shocking. She had crossed the hall to Pinkie's room and saw that she had apparently decided to wear an erotic looking ensemble. She had no idea where the pink pony got it from, since nopony should know how to make such a thing anymore, but Luna couldn't deny it made her look more... enticing....

Next up was Twilight Sparkle, who was lying on her back in her bed, the sheets soaked and her tongue hanging open, allowing drool to escape. Upon closer inspection, she spied the head of a tail brush peaking out of her marehood, the handle being lodged inside. It was apparent she had used it as a makeshift stallionhood, which she was actually familiar with. Mares often used such things in the old days if stallions were not available, but usually not ones that were so crude.

She crossed the hall once more to enter Applejack's room. Hers was a little more tame, at first, but then she noticed the shredded fabrics littering the floor. Clearly, this pony was strong; she had inadvertently destroyed all her clothing and most of her sheets in the throes of passion. Luna hurried excitedly to the next room, Fluttershy's. She had began looking with the intent of gauging how far they had progressed sexually, but now she really wanted to see what they were up to for curiousity's sake.

She hadn't expected much, but she was still impressed the quiet yellow mare had cum so much. There were obvious stains throughout her room. suddenly, she noticed that some of it was dripping... from the ceiling? She left for Rarity's room with a shocked look on her face.

Opening the door, the first thing Luna noticed was that Rarity's room was in much the same condition as Twilight's, with much of the damage contained to stains on the sheets. The second was that Rarity was not in her bed, or even in her room at all. Suddenly, Luna's ears perked up as she heard a noise coming through a doorway she hadn't noticed before.

"La la la laa la, la la la laa la."

It was clearly Rarity's voice, singing that old tune everypony knew from their younger days. Luna heard the noise of a shower running as she approached with curiosity, and then realized that Rarity had to already be awake, and was clearly cleaning herself of the mess and the smell she had no-doubt accrued during her night of self-love. Luna imagined her body, glistening with water as she sang the tune in the shower, scrubbing her body up and down. She couldn't form a perfect image, having only seen her clothed, but her imagination filled in the blank spots.

Suddenly, she didn't have to imagine anymore, as the door to the suite's bathroom opened and Rarity herself stepped through.

Naked, glistening, voluptuous. Her real body was even better than what Luna had imagined. The first thing she noticed was her huge breasts. It was uncommon for a pony that wasn't a princess to be quite that big. They were almost large enough to rival her own, and capped with beautiful nipples that were still hard, somehow, with water dripping from the tips. Her gaze turned downward, and Luna appreciated the way she struck an hourglass figure, her relatively thin, in comparison with her breasts, stomach tapering into wide, inviting hips. Her legs were long and smooth, same with her arms. Clearly, this mare cared for her body. Luna could see her marehood betwixt her thighs, and noted how it was in perfect condition, and dripping a bit more than the rest of her. A normal mare's lower lips would have been red and swollen having suffered so much abuse last night.

Luna couldn't deny that she felt some degree of arousal, but she was still new to the experience of being attracted to another mare, and so withheld the advances her body wanted her to make.

Rarity's legs shifted into a more sultry position, and her breasts had suddenly thrust forward. Luna looked up to find Rarity was looking at her with a smile on her face, having begun to pose for her.

"Why hello, Princess, I was just going to clean my room and air dry, I trust you are enjoying the show?" Rarity hefted a breast in one of her hands and jiggled it a bit. "I know that these are the main attraction, but there are other events," At this, she turned around and thrust out her flank, which was large and sensuous just like the rest of her, lifting her tail to make her marehood visible. "and I think you might enjoy them just as much." Rarity finished.

Luna was visibly flustered, and had to stammer out a reply. "Uhm, uh, well, fair Rarity (very fair, her mind added), I'm, um, very grateful for the offer, but, well, I'll need to go and, uhm, prepare the lesson plans! Yes, that's right, lesson plans." Her gaze shifted to the side, then Rarity turned back to face Luna, a bit of a pout on her lips.

"Don't you want to stay a little longer, Princess? I'm sure you could do with some relief from all that tension, don't you agree..." Rarity's eyes took in Luna's form hungrily, seeming to undress her with her eyes. Rarity took a step forward. "I could show you such pleasures, the kind only brought by a mare's touch." She took another step. She was close enough now that Luna could reach out and squeeze one of her breasts, if she felt so inclined. A gulp forced its way through her throat.

She definitely felt so inclined.

"I'm sure those crass stallions from the past cared nothing for you." Rarity advanced one last time, their bodies inches from each other. Rarity took a hand and gently grasped Luna's chin, forcing her to focus her gaze on Rarity's face. Her wet mane framed her face cutely. "I would lavish you with the attention you truly deserve..." Rarity leaned in for a kiss. Luna's eyes were closed, ready to receive it.

Just before their lips met, Luna's eyes bugged wide open and she ran off, simply shouting "Lesson plans!" as she shut the door behind her.

Rarity stomped her hoof in frustration. "Oh come on, I was this close!"

The mane six set about cleaing up their messes from the night before. They were kind of embarrassed at their predicament, but they had time before the first lesson with Luna began, and the task helped to distract them from their other thoughts.

They simply couldn't stop thinking about sex now. Everything made them want it. A glance at a pillow evoked images of lying in it, lavishing their bodies in attention. Scrubbing with rags made them want to scrub more intimate parts of their bodies. Any attempt to distract themselves brought images of their friends in various states of dress, enjoying their touch or giving it in equal measure.

It was starting to become a problem.

The six mares got dressed in simple cotton shirts and jean shorts, with the fabric rubbing against their bodies uncomfortably, begging to be taken off. They remembered to pack their Elements into their bags, as Luna had requested the previous evening. They were still glowing, perhaps even brighter than before, but they figured they could ask Luna about it once they got there.

Trying to avoid looking at one-another, they set out for the dark wing of the castle, where Luna's class was to take place. On the way, a particularly beautiful assistant mare walked by, her body similar to Twilight and Pinkie Pie's. They all stared as she passed, practically drooling as they mentally undressed her and imagined the unspeakable things they would introduce to her. She quickened her pace, noticing their stares, then rounded a corner and was gone.

Finally, they came up on the door to Luna's study and entered. She greeted them graciously, apparently having gotten over her encounter with Rarity earlier this morning. They sat down on plush pillows, still fidgeting uncomfortably and blushing. Luna noticed, and began to speak.

"You still feel the call of the heat? I was under the impression you had relieved yourselves last night. Did something go wrong?" She didn't say she had seen the state their rooms were in. She had seen the aftermath of just one of them cumming by masturbation, and they were still horny? She began to wonder if they perhaps had too much potential.

They nodded, fidgeting even more as they felt the crotches of their undergarments begin to get wet.

"Whatever went wrong last night that would have prevented you from feeling release, My Little Ponies?" Luna asked with true concern. Applejack was the first to speak up.

"Well, your highness, it's not that we couldn't orgasm, no. We had plenty last night. It's just that... well, we still want more. The rest of the mane six nodded their heads in agreement.

"Dearest friends, I daresay it shall be difficult for you to focus on today's lesson with your lusts abounding in such a way. Do you still wish to attempt learning the vocabulary of sex?"

The six friends looked at each other, then nodded. Twilight spoke for them.

"Yes, Princess. I think we can handle a few words. Horny or not."

"We shall begin, then."

There were many words to learn. Tits, bust, or rack for breasts. Cunt, pussy, snatch, slit, and many more names for the vagina. Lust described the sensation of heat for another pony. When you desired to have sex with somepony you lusted for them. Attraction towards them eliciting a physical arousal of your body meant you were horny for them. An orgasm could be called cumming, which actually made some sense (and was an easier signal while in it's throes). The fluids coming from a mare's snatch during arousal could be called many things. Nectar, honey, cum, mare-cum if you wanted to be specific. This segued into a lesson on using euphemisms for sexual terms. Luna admitted that she could not possibly teach them all, and encouraged them to get creative.

The mane six absorbed this knowledge easily. Since it was at least connected to sex in some way, they found it easy to remain focused on the subject and place their raging lusts to the side for now.

Unfortunately, the lesson had to end at some point, and they all became suddenly aware of not just how horny they were (and how soaked the pillows they were sitting on were), but also how hungry they had become. Their stomach's grumbled, alerting Luna to her citizen's needs.

"Alas, it is noon, and ponies must eat. Go now, you may eat, then report back to me. I wish to discuss the Elements of Harmony this evening. In fact, leave them here, so I may examine them."

With that, they dropped off their glowing artifacts, adjourned the class, and took a lunch break. They all decided to keep it simple; Sandwiches of their choice flowers with hay fries, though the castle cooks were quite stellar, and provided great service. Rarity felt her mind wandering, wondering what other services they might provide...

They tried to avoid talking, not wanting to accidentally start making out in public, which they were on the verge of doing. Honestly, if they weren't prohibited from sex by Luna's decree, they would do it right on this table right now. They knew their uncontrollable lusts were becoming a problem, but they didn't know why it was happening, and it's not like they could resist for long. The heat was simply so strong. Ponies walking by could catch a whiff of their scent, but they didn't know what it was.

Almost panting and sweating at this point, they re-entered Luna's study, where she had been actively searching the depths of the Elements for evidence as to their odd behavior. She seemed glad they had walked in, apparently having made a discovery.

"Ah, there you are. I have figured out what is wrong with the Elements of Harmony. They are radiating an excess of friendship energy, since they can't store it all. I was not aware they had a capacity, but it seems you six's recently bolstered affections for one-another has kicked the Element's energy production into overdrive. Unfortunately, due to their nature, you are bound to them, and so they share that energy with you. I believe that the excess friendship energy is projecting itself back onto your bodies and manifesting as lust, likely due ot the nature of your recent actions that would be generating this energy in the first place." Luna was confident in her research.

They realized now that it was the Elements of Harmony themselves that were causing their recent spike of lust, but one question still remained.

"So, how do we make it stop?" asked Rainbow Dash.

"Simple, you must use the Elements to shed the excess energy. Just fire the energy away from anything important and you should be fine after that."

Her plan seemed simple enough, but they were still apprehensive about what the Elements might do if they wore them in this state. Celestia had expressed some trepidation earlier, and that had stuck with them, hence the fact they haven't worn them yet.

"I don't know, girls. Remember Celestia's warning? Maybe we shouldn't do this." Twilight suggested.

"But what are we gonna do? We can't focus like this!" Rainbow Dash replied.

"Well, sugarcube, we also can't focus if the Elements put us out of commission for one reason or another, now can we?"

"Applejack's right, we should play it safe, though Dashie does have a good point."

"Uhm, girls, I don't think arguing about it is going to help..."

Rarity was just about fed up with this situation.

"Well, girls, I don't see our choice in this matter. I don't know about you, but I will wear my Element and use it with pride." Rarity finally broke up the argument by taking her necklace and affixing it around her neck, placing her hands on her hips and her muzzle in the air with indignition.

No sooner had the glowing necklace been affixed did her outfit begin to ripple, invisible waves of magic rolling across her body. Rarity was scared, and so was everypony else present, but they couldn't do anything against the power of an Element of Harmony, and so were forced to watch.

Rarity's horn began to spark as excess magic flowed from it, and her clothes rippled even faster as she was picked up off her hooves and lifted into the air. She could feel the magic coursing through her veins as the Element's excess energy flowed into her much more quickly, now that they were connected.

And with it came unimaginable lust.

Rarity gasped as a pulse of magical lust shot straight to her marehood, which quivered in response. She felt her mare-cum start to flow faster, likely staining her new panties and shorts permenantly. What happened next, though, ensured she wouldn't need to worry about that.

A distinct tearing sound could be heard, and they looked to find that Rarity's clothes were being shredded by the magic. First her sleeves came off at the shoulders, next her shorts split down the sides, then her shirt was cut right down the middle, and finally the flow of magic increased again and shredded her remaining clothing into tiny bits.

Rarity wasted no time in allowing a hand to begin servicing her dripping snatch once it was finally exposed. She moaned loudly as her Element pumped wave after wave of delightful lust through her veins. When they looked closer, they could see that Rarity was very slowly changing as she fingered herself. Each pulse seemed to make her a little more attractive, but they couldn't place why at first. Eventually, they noticed how her mane had begun to lengthen, flowing outward and gaining volume. Next, they saw her getting slightly taller.

Rarity cried out loudly as her fingers finally brought her to orgasm, her cunt spraying juices all across her legs and the floor. This caused the rest of the changes to happen all at once as her eyes glowed from the overflow of magic.

Rarity's already prodigious breasts surged outward, growing a few sizes until they were a match for Celestia's. Her other curves filled in to compensate for this change, and she gained some height as well, bringing her level with Luna. Her mane flowed even longer, now reaching down slightly lower than her flank, while her tail would drag across the floor if she stood upright. Each pulse of lust seemed to be prolonging her climax, causing her dripping sex to make a veritable puddle of fluids on the floor beneath her. The room had already assumed the heady smell of sex.

Overall, Rarity had been transformed from a beauty queen to a veritable sex-goddess. The other mares in the room could only gasp as the magic finally stopped pulsing through Rarity's body and dropped her un-ceremoniously to the floor, bringing her to one knee with a hand on the floor to help maintain balance. Her new strength was belied by the fact that the stone had cracked beneath her.

Nopony could deny that they were incredibly wet after a performance like that.

Suddenly, Rarity lifted her head and gazed around the room, her eyes no longer glowing, but instead bearing a certain intensity that wasn't there before.

Her eyes alighted on Luna, and in the blink of an eye she had teleported to her and locked their lips in a passionate kiss. Despite her intimidating beauty, she was surprisingly gentle. She ripped Luna's clothing from her body with ease and gently sent them towards the ground, where it would be easier to have sex.

At first, Luna was apprehensive about continuing, but then she noticed how nice it was to be cuddling up with somepony who was so soft. Their huge breasts were mashed together, like pillows between them, and her face was just so pretty and her lips were so soft and her body was gentle and inviting and warm...

Luna thought she was becoming attracted to mares.

Twilight and friends stared, mouths agape, as Rarity made out un-abashadly with the Moon-Princess. Seeing her new body making love with Luna's equally beautiful one made them hornier than they thought possible.

Twilight, with a slow smirk, placed her Big Crown Thingy upon her head.

Author's Note

I split this chapter into two parts. It was getting too long, and I want to start pacing myself.