With careful, measured steps, Princess Luna stalked through the palace in the darkness of night. She avoided the thestral guards at every turn, finding that even with their stronger sense of hearing compared to their Equestrian brothers, she was easily able to sneak under their radar. As she made her way from her observatory to the lone hallway connecting her room with her destination, she swiveled her ears back and forth, searching for any indication that she was being followed. Once she was clear of the observatory and in the palace proper, her ears flicked forward, detecting the sound of incoming hoofsteps, armed with heavy sabots.

Luna quickly unfurled her wings and with one powerful, yet nearly silent flap, reached the tall ceiling of the castle hallway. Her horn ignited in a deep blue hue and rendered her almost completely invisible to the naked eye within seconds. She shot out her legs to the walls to hold herself up and looked down just in time to see a pair of thestral guards patrolling the hall, a quiet conversation between them echoing through the empty hall.

"I just don't see the point. We already have a princess of the day and of the night. What's a third princess going to control exactly?" One of the guards, Sabre Spear, if Luna's memory was accurate, said.

"Not just one more princess. Crescent Peek from the Day Guard told me that the princesses are discussing a fourth princess as well. Something about that student of Princess Celestia's that destroyed Nightmare Moon or something. From what I heard, they're gonna be the princesses of Love and Friendship or something." The other guard, Quill Point, replied.

"There's gonna be too many princesses to guard at this rate." Sabre shook his head.

Luna watched them as they passed under her, completely unaware of her presence.

Hmm... if my night guards already know what Tia and I are planning, then gossip must spread more quickly around the castle than we predicted... We must be careful not to let too much else out, lest they reveal something classified to somepony without clearance. She thought, her brow furrowed as the guards left through the hallway.

With the coast clear for the moment, Luna dropped from her hiding spot, flapping her wings just once more before landing on the ground with a quiet *clop*. She canceled the spell keeping her invisible and proceeded toward her destination. She found few guards along her route, allowing her to make much quicker time. Within a few minutes, she was standing outside her sister's door.

As the dark princess stared up at the imposing frame, she carefully knocked on the large wooden door. The sound echoed in the empty hallway, making her ears snap back against her skull. She quickly looked left and right for any prying eyes, thankfully finding nothing before the door creaked open.

Luna looked into the now open doorway to find none other than her sister standing there, as beautiful and majestic as she ever remembered her. Her pristine white coat, neatly groomed and cleaned to have just the right shine in the pale moonlight, her soft flowing mane, which largely reminded her of sherbet ice cream, and her gentle magenta eyes, giving a view of the most generous soul she'd ever know, made Luna's knees weak. She allowed a soft smile to grace her face as took her sister in for what felt like the first time in years.

"You're late." Celestia teased, her voice smooth as silk as it caressed Luna's ears.

A smirk found its way onto Luna's face immediately, "Well my guards were doing their jobs, after all. Not like it's as easy to sneak around the palace at night as compared to the day, sister." She teased.

Celestia chuckled, "I'll have you know that my guards do their very best."

"I should hate to see their worst then." Luna snickered.

"Oh har har..." Celestia relented, before her eyes softened again, "Are you sure nopony saw you?"

Luna beamed, "Absolutely. The guards just had their shift change, and I instructed them in the evening briefing that neither of us were to be disturbed the entire night. We have four hours until the next shift change and I can sneak back to the observatory."

"Perfect. Although... We could avoid all this sneaking around and such if you'd just teleport into my room. It's not like the guards will monitor inside while I'm expected to be sleeping." Celestia suggested.

"That's true... but this is more fun, is it not?" Luna grinned.

"Heh, I suppose. Now, come inside, won't you? It would be a shame for a guard to see you standing outside my doorway and all your hard 'sneaking' to go to waste." Celestia chuckled.

Luna took the hint and entered Celestia's room, the door closing softly behind her with a quiet *click*. Once inside, her eyes lingered on her sister's form for just a moment before drifting to the rest of the room. A trail of roses led the way to Celestia's massive, soft bed. Finely woven purple silk sheets covered the bed, bringing a smile to Luna's face as she imagined the feeling of the silk against her hooves and coat. The fireplace behind the bed crackled with warmth and light, bathing the room in a gentle orange glow and casting flickering shadows across the floor.

Just as Luna stepped forward, a white wing stuck out in front of her, halting her advance. She cast a curious look at her sister, only for a blush to cover her face as she watched Celestia slowly saunter over to the bed. The larger mare casually laid down on the sheets, taking her sweet time to roll over and expose her teats and bits of her marehood to her sister as she found the most sensual pose she could.

Laying on her side, her head resting on her hoof, and her legs spread just wide enough to give her sister a clear look at her winking sex, Celestia brought her free hoof to her lips and blew a kiss. Luna stumbled back a step, her cheeks burning as she drank in the view of her sibling so shamelessly showing off her body. On quickly weakening legs, Luna walked over toward her sister, finding herself at the edge of the bed in mere moments.

"Well?" Celestia teased.

"Faust I want you so much." Luna whispered, her own sex winking desperately.

"Well then come and take me."

Luna needed no second invitation, and clambered onto the bed. She eagerly pressed her lips against her sisters, her tongue instantly rushing out to dance with Celestia's. Luna's hooves quickly grabbed onto Celestia's cheeks as she turned her head to deepen the kiss, soon finding their tongues lashing against each other in a passionate display of love that only drove her lust even higher.

They pulled apart slowly, leaving a thin line of saliva connecting their lips. Both breathing heavily, they separated only enough for Luna to turn her body around and bring her muzzle to Celestia's teats. Without a moment of hesitation, the younger princess latched onto the closest teat like it was her mother's and she was a newborn foal, earning a soft moan from her sister in the process. Luna kissed and licked the prickly flesh, along with the mound that supported it while Celestia ignited her horn and grabbed a hold of her sister's tail while she continued her assault on her teats.

Celestia gave a sharp tug on Luna's tail, forcing a cry of ecstasy to escape her lips as she paused her suckling. The sun princess licked her lips as she stared into her little sister's treasure, just between her legs and coated in the black of her cutie mark. The lips of her vulva parted quickly, allowing her cute pink clit to peek out again and again under Celestia's lustful eyes. It only took a moment for her to dive into the abyss , her lips quickly latching onto the engorged nub as it poked out again.

Luna immediately threw her head back and gasped as Celestia buried her muzzle into her pussy, and suckled at her clit. Waves of pleasure darted up her spine over and over again as she struggled to find air to fill her lungs when all she wanted to do was scream out in rapture. Luna slowly turned her gaze back to her sister as she lapped at her folds, juices dripping from her muzzle and into the bedsheets below. It took all of her willpower to not cum right then and there.

Stealing her resolve, Luna turned her head back to the treasure just before her and leaned down. Celestia's sex was unbelievably beautiful in a way that only an immortal goddess of the sun could be. Her perfect flanks, curved perfectly in all the right places, ended just at the soft, pinkish outer lips of her vulva, and the delicious pink deeper inside. Just as Luna leaned forward to have her taste, the pink nub of Celestia's clit poked out once more, prompting the night princess to take a moment of loving revenge.

Luna planted a kiss on Celestia's clit that instantly turned into a long, sensual suckling that forced the larger princess to quiver beneath her. Luna smiled to herself, even with her mouth practically filled with her sister's clit and juices. She sucked hard on the little bundle of nerves, forcing Celestia to pause and moan into her folds.

Not wanting to be outdone, the solar princess ignited her horn once more, and a similar golden aura formed inside the very pussy she was eating, only to fill her sister's folds with vibrations a moment later. Luna instantly released her clit and screamed in pleasure as her pussy clenched over and over again on a member that simply wasn't there. Celestia continued to suck on her clit, forcing her completely over the edge just a moment later, and a flood of her marecum rushed out into the older sister's eagerly waiting muzzle.

Stars danced about in Luna's vision as her entire body was overcome with rapture. Her legs quivered and her muscles tensed as wave after wave of sensual pleasure rippled up her spine and back down into her folds.

"Tia..." She moaned, her voice drifting from a low to high pitch as she came again and again.

The lunar sister eventually came down from her high, and collapsed onto her sister's belly. Luna's legs shook weakly with the force of her climax, and she struggled to lift her head up from her sister's teats after such a powerful orgasm. She slowly turned her head back around to see his sister swallowing down the last of her essence. Celestia licked her lips to clean off anything else she missed, although there was a fair amount of fluid still all over her face and dripping down her fur.

"No... fair..." Luna whined.

"Whatever do you mean, Lulu?" Celestia asked, innocently.

"You used... magic... you know that spell is my weakness." Luna pouted.

Celestia smirked, "Oh, I know. I just couldn't wait to hear your voice again. It's been so long since I've heard that beautiful range of yours when you climax. I suppose I just got a little carried away." She chuckled.

"Well... now I simply must make you climax as well... tis' only fair I get to hear your voice, after all." Luna grinned, pushing herself to her hooves, albeit shakily.

Celestia playfully rolled her eyes, "I suppose that is fair. By all means then, take me, dear sister."

Luna quickly ignited her horn and a phallic shaped apparition of magical energy appeared next to her only a moment later. Celestia raised her eyebrows in surprise for just a moment before the magical construct moved over to Luna's groin, just between her teats, and a strap emerged from behind it, latching onto her, just below her teats. A knowing smirk appeared on her face as the lunar princess stepped up between her spread hind legs and straddled her. The magical dildo came to a rest just between her teats, and Luna took her time rubbing the appendage against the sensitive mounds of flesh for a few moments before leaning in for another kiss.

Their lips caressed each other slowly and sensually as the lunar princess lined herself up with her sister's slit. Luna's tongue darted out to pry Celestia's lips open, allowing her access to her own once more. Just as their tongues made contact, Luna thrust her hips forward, penetrating deep into the larger alicorns dripping pussy. Celestia immediately broke the kiss and gasped as her eyes shot wide open from the unexpected intrusion.

Luna smirked, "Oh, I'm so sorry, dear sister. Did I forget to warn you?"

Celestia fixed her with a playful scowl, "Alright... I suppose I deserved that for cheating earlier."

"Indeed. Now, it's long past time I made you scream, dear sister." Luna purred, leaning down and drawing a long, slow lick up Celestia's horn.

The older alicorn shivered from the sensation, her lips trembling as she felt the tingling feeling of her sister's magical member deep in her folds. After a moment, Luna pulled back far enough to pull her hips back and thrust forward again, earning a small squeak of pleasure from Celestia as she was slightly rocked back on the bed.

In and out she thrust, the lunar princess keeping an ever watchful eye on her sister's face to gauge her reactions. On one thrust, her face grimaced, prompting Luna to change her angle slightly, earning a long, pleasureful moan in response. She kept her thrusts angled right at her sister's g spot, forcing her chest to heave as more and more pleasure was forcefully fucked into her snatch. Celestia's cheeks flushed pink as her clit winked out again and again against the top of the shaft Luna was fucking her with.

Luna bit her lip as she watched her sister moan and convulse beneath her, and the feeling of dominance she felt from fucking her brought a fire to her own loins that made her own clit wink out again and again. She glanced down at her magically strap on for a moment before an idea popped into her head, and she ignited her horn once more.

A moment later, another magical construct appeared just behind her winking sex, and plunged into her depths, making Luna groan in bliss as she fucked herself along with her sister. She synced her own dildo with her thrusts into her sister, adding extra force into her thrusts in the process, and drawing a long, loud moan from her sister. If her increased volume was anything to go off of, she was loving every second of it.

Celestia felt her end quickly coming for her, and she struggled to find the words as her sister pounded her pussy with a force only an alicorn could muster.

"Lu-Lulu... I'm close." Celestia moaned.

"As am I... Tia." Luna groaned.

"Let's finish... together." Celestia whispered, gently placing a hoof against Luna's cheek.

Luna paused in her thrusting, her cheeks flushed as she stared down into her sister's eyes. She only hesitated a second before a warm smile filled her face.

"I would love nothing more, sister." She replied.

Luna immediately redoubled her efforts and thrust into her sister even faster, and the magical dildo in her own sex thrust in and out of her just as fast. Luna and Celestia both panted for air as their bodies pressed against one another, sweat dripping from Luna's neck and onto the larger alicorn's belly. Celestia gasped and moaned with each thrust, her volume easily drowning out Luna's as the younger sister panted while thrusting away as hard as her hips could.

Celestia felt each thrust of the magical dildo press up against her cervix, and her g spot was hit nearly every time the medial ring slid over it, sending tingles of ecstasy up through her entire body. The dense cluster of nerves inside her labia fired off a sensory overload that drove her higher and higher toward rapture with each deep thrust from her sister. Celestia found that as much air as she breathed in, it was gone just a moment later as she heaved desperately for air amidst her moaning and screaming.

Luna felt her pussy convulsing over and over around the dildo she was fucking herself with. Her clit winked again and again, pressing against the medial ring of the magical construct as her folds were filled with each thrust. Her breaths came out as ragged panting while she continued to thrust away, her legs burning from the exertion. Sweat dripped from her brow and all over her body as she pushed herself harder and harder into her sister below.

Eventually, it became too much for either of them, and they finally reached their peaks. Celestia tipped over the edge first, her walls convulsing and contracting as marecum gushed out of her slit and past the magical dildo. She coated the bed, her tail, and all of Luna's belly and thighs as she screamed out to the heavens and her back arched. Every muscle in her body went rigid, forcing her to shiver and quiver in place as Luna continued to thrust into her for just a few more climactic thrusts.

Luna finally hit her climax as well, her pussy convulsing tightly on the dildo still inside it. Unlike her sister, hers was much more reserved, and she only grunted several times as her back arched with each wave of orgasmic bliss that passed through her from her sex all the way up to her ears and then back down again. Her winking pussy dripped marecum down onto the bedsheets below as she stood over her sister, gasping for breath as her muscled slowly relaxed.

After a few moments of riding the lightning, Luna cut out the spell she was maintaining, and the dildos disappeared. She immediately collapsed onto her sister as they both panted for breath. Celestia gladfully pulled Luna into a tight hug as they caught their breath together in the firelight. She could feel the younger alicorn's heart pounding against her chest as Luna hugged her back.

"Well... I can honestly say it's been a millennia since I've cum that hard." Celestia chuckled.

"Cum?" Luna inquired, an ear perking up as she was far too tired to lift her head.

"Oh it's a newer saying. It just means an orgasm, or a climax." Celestia explained.

"Hmm... cum. I like it." Luna smiled.

"Heh, I'll bet you do." Celestia replied, suppressing a snicker.

"Oh, har har. You're so full of jokes this evening, sister." Luna responded with a whinny of annoyance.

"I'm just teasing," Celestia dismissively waved her hoof, "It's been far too long since I was able to do so with you."

"I know... I have missed it... I've missed... this." Luna whispered, burying her muzzle into Celestia's chest tuft.

"As have I. I'd almost forgotten of your fondness for my teats and tuft." Celestia snickered.

Luna nuzzled her cheek against the soft, long white fur of her sister's chest while the larger alicorn softly cooed and planted small kisses on the top of her head. The exchange of affection continued for a few minutes before Luna finally pulled away, a thin strand of drool connecting her muzzle to her sister's chest for just a moment longer.

"I'd forgotten how soft your coat was. I was beginning to fall asleep there for a moment." Luna admitted, a sheepish smile on her face.

Celestia laughed, "I recall an article I read in the news a few years back, comparing the softness of materials in Equestria. Clouds won, but only because I declined to allow them to feel my tuft for comparison."

Luna chuckled, "I'm sure that our little ponies were devastated that they wouldn't be groping you for the sake of 'science'."

"Oh the poor dears were. However, as you recall, there's only one pony in the world that I love enough to let her drool all over my chest after an evening of passion." Celestia smiled warmly down at the smaller mare.

"Hmm... might this pony perhaps have some sort of power over a particular celestial object floating in the sky?" Luna teased.

"You know," Celestia began, wrapping her hooves around Luna's barrel and pulling her close enough for their muzzles to touch, "I think you just might know her." She said, planting a deep kiss on the lunar alicorn's lips.

They held the kiss for several moments as the flames from the fireplace crackled behind them, framing the scene in a hue of orange light and warmth. Celestia's hoof gently stroked against Luna's wing, forcing a shudder to run down her spine, while she played with her silky smooth ethereal mane with her other hoof. Meanwhile, Luna drew her hooves down Celestia's barrel, all the way down to her cutie marks, where she rubbed circles around the pair of flaming suns while her tongue danced with Celestia's.

Eventually, the kiss broke, and they pulled apart enough to look into each other's eyes once more.

"I truly have missed you, sister. More than I can ever put into words... I'm just so glad to have you back." Celestia whispered, her magenta eyes watering some.

"Tia... you have nothing to feel regret for. You did what you had to do... The fault was mine, clear as your day. If I had only listened to you and not let my jealousy get the better of me... we never would have been separated." Luna replied, her eyes misting slightly as well.

Celestia pulled her into a tight hug once more, "I promise I'll never let anything like that ever happen again. I won't ever let the darkness take you from me. I love you." Celestia whispered.

"I love you too, sister... more than I could ever describe. I'm just thankful that the elements allowed me to return to you at all." Luna replied, her voice also a whisper.

They pulled away once more, this time enough to fully separate and spread out more on the large bed.

"It seems we have created quite the mess in your chambers." Luna remarked, amusedly looking down at the still wet bedsheets. She ignited her horn, and the mess was suddenly transported to the far side of the bed, away from either of their bodies.

"Indeed. It seems that I'll have to request clean sheets from the maids tomorrow morning." Celestia chuckled, before a yawn escaped her lips.

"Are you feeling tired, sister? There's still quite some time before the next guard shift, but I can let you rest if you'd like. I know you have to raise the sun in just a few hours." Luna replied, stifling her own yawn.

Celestia smiled, " I appreciate that greatly, Lulu, but I would like to spend some more time with you, if you've nowhere to be for at least another hour. Besides, tomorrow all I have to do is raise the sun and conduct Day Court. It's a relatively easy day for me." She responded.

"I'm happy to stay with you as long as you'll allow." Luna replied, laying down beside Celestia once more.

They shared a brief nuzzle before Celestia spoke again, "So how has it been, resuming your duties as a princess?"

Luna sighed, "As much as I've missed our subjects, I don't believe I can say the same for them."

Celestia's brow furrowed, "What do you mean?"

"They fear me, Tia. Even after the elements freed me from the nightmare's curse, they still think that I'm... her. Even when I enter their dreams to help them, I seem to do more harm than good, at least... so far." Luna explained with another sigh.

"They'll come around. I know they will. I'm sure you'll see soon enough. You've no idea how many ponies adore the night sky and the princess who crafts it for them" Celestia comforted, offering a small nuzzle to the lunar princess.

"I hope you're right, Tia. I hope you're right."

Author's Note

Hey all! Can't begin to express how excited I am to finally be sharing this story with ya'll. I've been writing it for months now and we're finally here. It's gonna be a fun ride and I hope you all stick around until the end!