Chapter 1
The air was cool, crisp, and quiet as Celestia sat in her royal chambers, getting ready to relax for the night. The moon was already out, raised by her sister hours ago. The glow from the moon cast its silver light through her open window as a midnight breeze fluttered the thin curtains. The only other thing that gave the room light was a small candle positioned on Celestia side table, giving her enough light to read from a spellbook Cadence and Shining Armor delivered to her from the Crystal Empire. In all truth she should have been sleeping, considering morning would be arriving faster than she wanted, yet she knew trying to sleep would be futile.
She was going to have company that night. Company in the form of her younger sibling Luna.
Celestia was alert and eager, looking forward to seeing her younger for a short spell. Every few seconds her eyes would dart to the door and hope to hear a pair of hooves slowly walking to it. Her eyes struggled to stay open, switching from the ancient spell book to the door, but Luna would be with her very soon.
Finally a distant clopping of hooves started to resonate from behind the door and Celestia knew she was coming. The closer it got, the more she could feel her heart thumping in her chest. Anticipation, excitement, and even desire made her body shiver and feel warm for a brief second against the air. A few seconds later, voices ranging from Luna’s to the guards positioned outside of her door were exchanged. For what was about to happen, it was better if the guards were not around to hear. The voices stopped and the sound of hooves started to move away from the door. The further the hooves went, the more the excitement in her fatigued mind rose up. Once the hooves were drowned out by the silence of the night, a small and delicate knocking came from the wooden door.
“Come in,” Celestia said softly, just loud enough so Luna would hear her.
As the words left her mouth the large door slowly opened up and the silhouette of her sister stood in the doorway. Their eyes connected briefly before Luna slipped in and closed the door behind her, making the candle flicker violently from the small burst of air.
“Good evening dear sister,” Celestia spoke first, as Luna slowly moved to her bed without speaking. “You’re a bit late today.”
“Apologies. Had a small debate with my captain about certain activities she’s been doing as of late,” Luna replied in a soft tone, her breathing slow and heavy.
“Oh?” Celestia asked in a curious tone. “Do tell.”
“Something I’ll deal with after,” Luna replied as she pulled her light frame onto Celestia’s bed and pulled close beside her sister.
The first to touch Celestia was the soft down of Luna’s feathers, brushing against her own. The next was her soft, warm body pressing against her until Luna moved her face close to Celestia’s. The small candle on the side gave Luna’s face a bit of color as she moved in, letting her sister study her nightly features.
“More important tasks to deal with I assume?” Celestia joked as she gave her a quick kiss on her cold nose.
“Very, can’t have my big sister waiting all night for me, now can I?” Luna replied, matching her elder’s tone as she adjusted her body, making the soft sheet move around and become untidy.
“I take it you know the spell by heart now?” Celestia asked, excited to get started as soon as possible.
“Very much so,” Luna whispered into her ear letting every syllable sink into Celestia’s mind, making her more eager.
Lighting up her horn, a soft blue magical aura swirled around it. The magic energy rippled in the air as Celestia hovered the ancient book to her side table and watched her sister perform. Pulling herself up, Luna manipulated the spell, letting the swirling energy descend down her body until it swirled around her thighs. Celestia looked at Luna’s face, seeing nothing but pure concentration on it. Her eyes were closed and fidgeted as she tried to not make any errors in the spell. The spell was a unique one that reformed the bodies inner working, changing them to reflect the opposite gender.
Calling it the complete opposite wasn’t the full truth, but rather it was a fusion of both the male and female sexual organs. Luna could feel every part of the spell working her body. She could feel her vagina shrink slightly, as an artificial pair of balls started to grow from the area.
Celestia continued to watch with hungry eyes as a pink and slightly blackish cock started to grow near Luna’s balls. Hearing her little sister grunt slightly, Celestia looked up and saw her sisters horn sparkling with magic. The spell was a complex one considering it altered the casters body, changing around lots of the internal workings. The one thing it didn’t change was the semen output. If a male cast the spell, even with a female’s organ, he could still get a female pregnant if tribadism was used and she was in heat. If a female used the spell, her semen would remain the same, making any receiver on the other end not worrying about impregnation. In a more simple explanation, male could still impregnate females if tribadism was used in greats effect, while females didn’t have to worry about any unwanted foals appearing.
Once the spell was complete, Celestia stared down and saw a fully erect stallion penis hovering below her sister’s gut. Neither said a word as Luna moved closer to her and let her newly made erection jab slightly at the lower part of Celestia’s haunches. As Celestia felt it prod her legs, they closed slightly as her breathing picked up.
“Hmm,” Celestia hummed in a soft tone as her eyes looked at Luna’s newly added member. “I’m happy that Twilight found that book in her library and had Spike send it back to us.”
“Indeed, tis the last known copy of the book as well,” Luna replied with a matter-of-fact tone as she looked at it as well. “Shall we begin?”
Celestia nodded her head and adjusted her body so her head was resting against her pillow and her ass was presented to her sibling. Resting her knees on her sheets, Celestia made it simple for Luna to study her slender frame. Swishing her tail for a few seconds, she brushed it against luna’s chin and even her erection, successfully making her coo softly from her touch. Taking her touch as a sign to start, Luna jostled herself forward, resting her head between her wings. While she couldn’t reach her face to make it more intimate, Luna opted to focus mostly on pleasuring with rutting and wing play. Celestia cooed softly as felt her sisters hot breath touch her wings, but she didn’t say a word to her. For a few seconds, Luna gently planted small kisses on her spine, making Celestia crane her neck slightly as her wings fluttered in response. She loved the soft yet abrasive feeling of her tongue and even her lips, caressing her fur and even her flesh quietly.
“Mhm, trying to mimic a proper lover I see,” Celestia said softly, letting her wings spread open.
“I aim to please,” Luna replied as she moved her lips to the base of her sister’s right wing.
Feeling her touch her wings, Celestia rested her head, her mouth hanging slightly open as Luna inspected them with her mouth. The way her mouth caressed the base of her wing, it was enough to put Celestia in a small daze. Before she could sink into her blissful daze, Luna pulled away to speak.
“Mhm, seems you haven’t preened your wings today.” A smile came across Luna’s face, knowing she had a reason to play with them. “How unfitting for a princess.”
“Of course, a princess is not expected to do such things herself,” Celestia replied, putting a small grin on her face. “This is why I look forward to your company every night. You know how to do a proper preening.”
Smirking at her words, Luna reached out and gingerly brushed her muzzle against the large white feathers. Celestia shivered as she felt her tongue move out and meet the delicate skin under as well. Luna’s touch was very soft and it was enough to slowly arouse her. She wasn’t wet, but she would be very soon.
As Luna nuzzled her wing, she flared up her horn and focused it to touch her other wing, matching her soft touch. Feeling her magic touch her, Celestia’s moan softly caused her to twitch erratically. Seeing her sister enjoy it, she moved her mouth to her scapulars and gently suckled at the bone. Celestia gave off another moan as she almost lost her breath and felt a small wet feeling start to build up in her nethers. Moving away from the wing, Luna looked down as the scent of her sister’s sex filled her nostrils.
“Mhm, already getting excited are we?” Luna teased as she brought her lips back to Celestia’s wing and moved her lips over her marginals right to her alula feathers before stopping and gently nibbling at the area where her wing was about to bend.
“H-hard to keep one's composure when you… ah! Have one as skilled as you,” Celestia stuttered out, her wings twitching from the touch.
“Seems you need to be taught a lesson then,” Luna replied as she ran her hoof over her side in a slow yet arousing manner.
The movement matched the touch of a caring and curious sister. It was gentle but Celestia could feel desire behind it as it traced over her side before it traveled to her thighs and finally rested on her haunches. Knowing very well that she aimed to start rutting her, Celestia slowly spread her legs, giving her more room to work with. Adjusting her own hooves, Luna stopped treating Celestia’s wings briefly to position herself for entry.
Moving her hooves to Celestia’s flank, both mares braced against each other, letting the bed creak softly. Continuing to enjoy the feel of her sister’s soft white fur, Luna massaged her sun splotched mark gently, making Celestia moan softly into her pillow. Positioning her erection to line it up, Luna let it brush against Celestia, making both of them shiver with excitement. Happy to see that her preening made her wet, Luna pushed the tip of it into her folds.
Celestia eyes went wide with excitement as she felt the tip move in, but not in enough to penetrate her. For a brief second she felt ashamed for what was happening. Both of them were princesses, sisters born from the same parents. If her mother and father saw them right now they would get scolded for their unhealthy relationship. Yet just like regular ponies, the princesses were not immune to the lusts and desires of a naughty mind. In order to prevent unwanted relations with real mates, they sought to comfort each other while keeping a proper rule over their country.
“Are you ready for it?” Luna asked as she rocked her hips slightly, letting the tip push in and out just to elicit pleasure.
“What?” She spoke up, not hearing what she said to her.
“I said are you ready?” She asked again as she stopped moving.
Looking over her shoulder, she saw the eager and lusty look in her sister’s eyes. She could see her own wings flared open and vibrating slightly and knew she was going to return the favor at some point later on. With a nod of her head, Celestia faced her pillow and sank her teeth into it, preparing for it to enter.
Taking a deep breath, Luna pulled back slightly and pushed it in a few inches. Feeling it enter, Celestia groaned into her pillow, letting its girth and length slowly register in her mind. It was much like an average stallion’s dick, but it was an inch longer and a bit thicker, making it much more pleasurable than the rest.
“Mhm, you made it a bit bigger today,” Celestia moaned softly as a bit of drool coated her lips.
“Indeed,” Luna replied, pushing more in until half of it was resting against her wet walls. “You moan like a filly when it’s bigger than normal.”
Celestia blushed slightly, knowing she had a tendency to sound like a mare getting rutted for the first time when Luna felt like being slightly more willing to pleasure her. Seeing her sister relax, Luna smirked and with a hard push, she felt her penis go fully in. Feeling the sudden push, Celestia tensed up and let a loud moan roll out of her throat. Had there been guards outside of the room, they would have surely heard.
“Mhm, just like a filly,” Luna teased as she was able to kiss the back of her sister’s neck.
Celestia didn’t reply, letting the feeling of the twitching erection hold its place inside of her. She could feel her walls tighten around it, eager to feel it break into a motion of rutting. Luna felt the tightness as well, her body shaking as she wanted to start rocking her hips.
“Ahh, I feel like such a naughty pony. Mother please forgive me.” Celestia said in her mind as she started to breathe very heavily.
Moving her hooves down from Celestia’s body, Luna rested them against the bed sheets, mimicking the proper position of a stallion ready to rut. Resting them against Celestia’s, Luna pushed a bit more of her erection in, letting the base of her hips rest against Celestia firm yet bubbly ass.
Feeling the little extra push in, Celestia’s eyes went wide, making her mutter under her breath. Ignoring her muttering, Luna slowly pulled her erection out of her quivering pussy before she pushed it back in, making Celestia moan again and even making the large bed groan from the thrust.
“You have little self-control sister,” Luna teased, knowing Celestia couldn’t fight her own moans. Not giving her a chance to answer, Luna quickly broke into a well pace thrusting motion that felt rough, but felt good enough for both of them.
Celestia said nothing, letting her sister’s jerky movements provide her with satisfaction.
“Maybe I should leave the guard out front next time we do this,” Luna continued to tease her as she let her newly formed balls slap against Celestia’s wetness. “Imagine their thoughts when they hear their rulers rutting like common whores in the bed.”
Celestia only moaned into her pillow, letting the bit of saliva around it water her throat. She could feel Luna’s words taunting her, making her more horny than ever. The thought of a curious guard hearing them rut and opening the door only to see the small alicorn dominating her elder’s backside made her more wet. It was wrong, disgusting, and vile to think of, but nothing aroused her more than the thought of being watched. Focusing her thoughts back on the erection moving at a steady rate inside of her, she start to feel more like a common slut. Doing it with her own sister. Madness, travesty, fillyfooler, unfit ruler, and many more words spoken by the Canterlot nobles echoed in her mind. To know she was getting pleasured by a penis that shouldn’t exist would cause many unsettling rumors around the kingdom and even the country. Of course she didn’t care; the only thing she cared about was how long she could enjoy it in a night. Biting the pillow harder, she continued to moan into it, giving Luna more fuel to provoke simulation.
“Maybe I should do that tomorrow, maybe I’ll sneak a few of my unicorn guards in at some point and have them watch from the shadows, letting them clop themselves before us,” She spoke out in an effort to further arouse her sister but also herself.
“T-That not very princess like…you ah! You know,” Celestia stammered out, wanting to sound like a slightly concerned sister.
“I know,” Luna said in a matter of fact tone as she gave Celestia one large thrust before returning to her normal motion. “When we are in this room, we are but simple mares, seeking and basking in our carnal desires.”
Celestia agreed silently, knowing Luna was able to make sex greater than it was. She was, after all, the princess of the night and all its lustful desires. Her ability to dream walk gave her lots of access to ponies naughty minds across the land. Celestia was no exception to her dream walking and knew in the dirtiest parts of her mind what really got her off more than anything.
“I know what you like sister,” Luna said lighting up her horn, slowly making the erection a bit bigger. Celestia’s eyes went wide and she felt her throat block any words wanting to escape. It didn’t grow much bigger but enough to stretch her inner walls more than regular. Slowly pulling her larger erection out, she left only the tip of the ring in before giving it a hard thrust.
“AH!” Celestia’s voice return to her as she gasped, feeling the whole thing go back inside of her.
Celestia’s eyes nearly rolled to the back of her head as Luna moved at a faster rate than before. She wanted to move her head into the air but the only thing she could do was twitch her legs a bit to try and get her mind off of how big it felt.
“Oh mother,” Celestia moaned softly, her wings still fully extended and twitching violently.
Moving her head up a bit, Luna rested her mouth against her sister’s neck, planting small kisses on it like she did prior to her rutting.
“My sister is such a naughty mare indeed. Getting off from the idea of being watched. How very un-princess like of… you.”
Celestia said nothing, refusing to say a word to her, but instead wanting to enjoy the feeling of being stuffed like she was. Grinding her own hooves against the bed, Celestia hissed and moaned into the pillow, knowing very well the maids would have to change her sheets in the morning. No doubt her pussy was dripping juice onto the sheets, staining the delicate fabric, most likely making the cleaner question her nightly activities.
Luna loved provoking her sister with her lusty words. She knew Celestia wasn’t fond of her words but knew all of them were true. The words made her horny and succeeded in making Celestia’s wet walls tighten around Luna’s grinding dick, driving both into further depravity. Yet as horny as both were, Luna was far from done with pleasuring Celestia. Pulling her face away from her neck and without losing her frantic pace, Luna stood on her hind legs and stared at the next hole waiting to be filled.
“As horny as it makes you sister,” Luna said softly as she got ready to pull out. “I know what your biggest kink is.” She finished as she slowly licked her lips.
The words barely registered in Celestia’s mind, and when she slowly pulled out Celestia let her body relax for a few brief seconds. Wasting no time Luna moved her hooves to the base of Celestia’s tail, pulling it away, letting Celestia know what was coming next. Celestia quickly looked over her shoulder and gave her sibling a pleading look, begging her to put it back in, but she stopped herself as she felt her dick prodding at her backside, knowing she was going to make Celestia do something slightly whorish. Moving her hooves down, Luna wrapped her hooves around her midsection and got ready to pull her back.
“Your turn to do the work!” Luna hissed as she rested against Celestia’s chest before she let her body fall back, dragging Celestia with her.
As Luna’s back fell to the bed, Celestia’s body kept moving until her ass got impaled by her cock and her cheeks rested against Luna’s hips. Feeling Luna’s well lubricated cock slide into her ass, Celestia let out a very loud and very deprived moan as she nearly came on top of it. Luna too almost came herself from the sudden penetration as well, but it wasn’t meant to be for the time being. Snorting her nose, Luna let her magic die down and she moved her hooves to Celestia’s flank before she began to speak again.
“Now why don’t you move that rump of yours and finish yourself off?” Luna stated with a large smirk on her face.
Celestia said nothing and without even thinking about it, she braced her front hooves against the bed and slowly raised her own ass into the air before slamming it back down, allowing a wet slap to echo throughout the room. She did feel naughty for having to resort to moving her own body for pleasure but she was so far in she didn’t even care. Pleased by her sister’s eagerness, Luna chuckled and slowly ground her hips, providing Celestia with further satisfaction.
“Just like that…” Luna hissed, feeling her sister’s body start to bounce on her lap.
Celestia moaned in response, she closed her eyes and placed her hoof to her mouth to try and stifle her increasingly loud moans. Her bounces were deep and fueled by pleasure, letting each one hit Luna’s lap. Luna grunted as each one hit her, but found herself wanting to answer back. Adjusting her hindlegs, she braced her hooves against the sheets and thrusted upward, meeting Celestia at the peak of her descent. Gritting her teeth, Luna gripped her ass harder with her hooves and started to meet her sisters movements over and over again, making Luna sigh with content while Celestia moaned with depravity.
Luna’s thrusts were deep and long; long enough that each thrust would almost pull out completely, leaving only the head of her cock inside before it entered fully, letting the sound of wet flesh meeting fur play out in in short and erratic beats.
Both mares loved every second that ticked by for them. For Celestia, everything below her hips was starting to feel numb, but she refused to stop until she got her much needed climax. It didn’t take long for her, a few more minutes of hard thrusting from Luna passed until Celestia’s body started to quiver and shudder violently. Freezing up, Celestia lowered her head and muttered underher breath for Luna to finish her off. Though she didn’t hear her sister, Luna knew she was about to get her sister’s ejaculate over her balls and hindlegs. Not slowing down, Celestia’s lips trembled until she let out a loud, cracked moan and instantly came. Feeling the warm liquid hit her legs lightly, Luna smiled, knowing she got her sister off from just some good old fashion anal penetration. Though she had gotten off, Luna was still looking to have more fun with her.
Stopping her thrusting, Luna pulled her erection out and caught her breath for a brief second before she used Celestia’s body to pull herself over the bed slightly. Allowing her erection to target her sister’s now very sensitive pussy, she got ready to move back in. The movements didn’t even register in Celestia’s body as she started to bask in her afterglow but was quickly jerked out of it as she felt Luna’s dick re-enter her soaking wet hole.
“L-Luna, ah!” Celestia cried out, feeling her sister’s wet cock slap hard and fast against her wetness.
Luna said nothing, letting her sister’s own marecum coat her dick, allowing for fast and effortless thrusts. Celestia moaned wildly, eyes nearly rolling to the back of her head, enjoying the constant onslaught. Luna tried to pace her breathing as she found it to be very erratic, making her pant like a stallion near orgasm. She cursed under her breath, wanting her dick to finish up and fill her sister up. Eventually it happened, and with a loud grunt and groan, Luna felt the surge of jizz run through her cock and into Celestia royal pussy. As the orgasm was riding out, Luna thrusted a few extra times, making sure every last drop had made it into Celestia before it seeped out and coated her shaft, balls, and even the inside of her thighs before it found its way onto the bed.
Once it was over and Luna’s cock had stopped surging, both ponies stayed still, trying to catch their breath from the experience. Turning her head slightly Celestia looked at her sister and saw a slightly vacant look in her eyes. She couldn’t blame her, and with a deep breath, Celestia slowly pulled her abused cunt off of Luna’s dick. Once she was off, Luna lit up her horn and quickly got rid of the spell, letting her beautiful folds and nethers return to proper form. Looking down at her lap, Luna chuckled softly from the mess on it. Celestia heard her chuckle and looked as well, but she said nothing and slowly rested her tired head against her pillow.
With a loud groan, Luna rolled and steadied her body against the bed, allowing her to pick herself up and move over her sister’s head. Moving a bit of her mane away from her face, Luna gave her a quick peck on the cheek before Celestia responded by turning her neck and met Luna’s kiss. Both held it for a brief second before Luna broke and nuzzled her out of affection.
“I trust you had a good night?” Luna teased as she nibbled on Celestia’s ear lightly. “I better get my turn tomorrow.”
“Of course, what kind of sister would I be if I didn’t take care of your needs,” Celestia replied, her body aching from exhaustion and fatigue.
“Hmm, that’s what I like to hear. I’m going to borrow your shower quickly,” Luna replied as she looked to the still lit candle and blew it out.
As darkness filled the room, the only thing that gave Celestia the ability to see around was the moon from outside of her window. Staring at it for a few seconds Celestia smiled as she heard her sibling get off of the bed and trot for the nearby small bathroom to freshen up. Turning her tired body over, Celestia’s eyes saw her sister swaying her hips, letting her vibrant blue tail swish, giving Celestia the view of her wet backside. Feeling the look of her elder, Luna looked over her shoulder and smiled at her before focusing her vision on the bathroom. Once she opened the door and went in, Celestia smiled and rested her tired eyes, letting the sound of water cascading down become her shepherd into the dream world.