Luna blinked the sleep out of her eyes. It was the early evening, a few hours before her usual nightly duties would commence. This gave her some time to get ready, have something to eat and see her sister for a few hours before she went to bed.
Lazily Luna got out of bed and went to fetch her royal attire. She slipped on her crown and necklace as usual then paused for a second. She couldn't explain why but it was already beginning to feel like a boring night, so she decided she might get more comfortable a little earlier than usual. Slipping her necklace back off she instead reached for a very loose fitting sweater to replace it.
She admired it for a second. It was a gift from Rarity that she had been given after remarking offhandedly one time that it hardly even mattered what she wore given how her usual waking hours did not match up with very many other ponies. It was soft to touch, perfect for her long nights. She only hoped that nopony thought it was too out of place in the relatively short time she would be out and about.
With the sweater in place Luna made for the door, she would be having breakfast with Celestia soon. Well breakfast for her, dinner in her sisters case. They usually settled for a sort of brunch even though that didn't really make too much sense for either of them.
Walking through the halls none of the guards made any note of her slightly unusual outfit. Although this may have been because they weren't paid to make those sorts of observations it did do a little to ease her mind on topic.
Reaching the banquet hall she saw her sister was already sitting at one end of the long table. Celestia was looking fairly alert compared to her usual evening demeanor and it looked as though she was drinking coffee despite the late hour. Unusual, but perhaps she had some late night obligations that would be keeping her up.
“Good afternoon sister” Luna said as she took a seat across from Celestia “you're looking pretty awake.”
“Good morning Luna” she responded shifting her gaze to her sister “I have some pans for later tonight.”
Luna swore she saw Celestia smile for a second before returning to her default warm expresion, almost as if she was trying to hid it for some reason. Luna decided to let it go for the time being, it’s not like nondescript plans could really be something to worry about, especially if they made her sister happy.
“I see you're a little more casual than usual” Celestia noted “it looks good on you”
Luna blushed a little at the unexpected compliment. “Thank you, I would forgo the royal attire more often but I am a little worried about the image I’ll give off if im hardly ever seen with it.”
Celestia glanced down for a second and motioned to her bare chest and head with her hooves. “I’m already undressed, I think you worry too much.”
“I think it’s a little different for me though. You’re around all day making appearances and I’m hardly seen at all it around the castle.” She argued, “I think it's a little more important for me even as it starts to get late.”
“No, I really think you're fine.” Celestia persisted, “Besides with how baggy that sweater is nopony would even know that you're not wearing you're necklace beneath it. It leaves a lot to the imagination.”
There it was again, a faint smile on her sisters lips. This time Luna decided to press her about it.
“What's got you so happy dear sister?” she asked raising a slightly accusatory eyebrow.
“Oh, nothing specifically.” Celestia responded, “I just like having the opportunity to spend some time with my little sister is all.”
Luna was going to press further but at that moment the wait staff burst through the door carrying an array of food ranging from pancakes to pastries. Celestia, taking full advantage of the sudden interruption, immediately went about picking a variety of food to set on her plate. Luna was a little more hesitant, opting for just a few pancakes, she was becoming more and more aware that something was off.
She occupied herself with the food for a while before noticing Celestia having another drink of coffee. “Is it really such a good idea to be having coffee this late?” Luna questioned, “surely you won’t be awake for too much longer?”
Celestia looked at her for a second before responding in a slightly exaggerated tone. “Oh no you're right. This meeting I have wont take too long and I surely won’t be able to fall asleep for a while after.” There was a slight pause, “and besides sleeping after consuming so much caffeine is bad for your health.”
Luna somewhat doubted the validity of this second statement but decided not to interject.
“And nopony will be awake at such an hour, whatever shall I do?” Celestia continued.
Luna was a little apprehensive about what she was about to offer because it was quite obviously what her sister wanted to hear but she said it anyway.
“Well I suppose if you're going to be awake anyways perhaps you would like assist me in my nightly duties?”
“Yes that would be wonderful!”
The answer came a little too fast. The whole situation had turned strange, Luna wondered what the motivation behind her sisters actions were. This was all obviously planned in advance but what could the harm of it? Maybe her sister just wanted to spend more time together since they only ever really got to see each other twice a day.
“Alright then, you can come to my quarters whenever you are finished with you're meeting” Luna said, less tense than before.
At this point Luna had already finished everything she had picked out to eat but it had not been very much. She scanned the table looking for something else that might satisfy her but inadvertently caught a glimpse of her sister looking her over the same way she was the food on the table. But the expression was gone in an instant, replaced by the same jovial look she usual possesed.
Luna decided instead to use her empty plate as an opportunity to excuse herself.
“I think I’ve had enough. I’m going to go prepare for the coming night, see you later sister” she quickly said as she began to stand up.
“What’s the hurry Lulu? They haven’t even brought out dessert yet” Celestia asked warmly.
Luna had not heard that name in a long time. It was a childhood nickname.
Caught off guard she responded with Celestia's nickname by accident “No I’m really fine Cely”
She could feel her cheeks going red with embarrassment so she quickly turned around and made her way to the door. She glanced back once only to see her sister still sitting calmly with a knowing smile on her face.
“Ok, see you soon” Celestia called after her.
…
Safely back in her room Luna got a chance to reflect for a moment. What had that been about? This shouldn’t feel as weird as it did. Even if it was a plot by Celestia to spend some time with her that wasn't so bad right?
But she knew there was more to it. Celestia had been so delibrit in trying to hide something. And those looks she had given her weren’t normal either. Luna could not deny that towards the end the situation had felt almost sexual somehow, but that surely could not have been her sisters intent, right?
Even so she hated to admit that the thought really was turning her on. She tried to squash the feeling but it really was not working.
After silently debating with herself for a few seconds Luna came to the conclusion that her sister would certainly be at that meeting for a while and it would good to get this out of her system she reasoned. With that in mind she moved over to her large four poster and reached beneath her sweater toward her nether lips.
She didn’t do this often but Celestia really had gotten her worked up with just a few well placed words and glances. As she began to rub her clit with her hoof she simultaneously began to open one of her bedside drawers with her magic and levitate small pink dildo over to her.
Luna began to lick the toy up and down in order to get it lubed up, which probably wasn't wholly necessary considering how wet she already was but the action felt right.
She was getting so invested that she did not notice the door open or hear the soft hoofsteps on the tiled floor. What she did notice where the hooves that were suddenly massaging her soldiers, something hard poking her in the back, and a soft whisper in her ear.
“My, my, sister, isn’t it a little risky to be doing such a thing when expecting company? It’s almost as if you wanted me to walk in on you”
Beyond startled, Luna haphazardly flung her toy in a random direction and tried in vain to look innocent.
“Celestia! I thought you were going to be busy for a while and….and….”
As Luna struggled to find something to say Celestia's face came into view, apparently having caught the dildo with her magic and placed it in her own mouth during Lunas panic. Slowly she reached up and took it in her hoove, pulling it from her mouth before holding up against her sisters lips, effectively stopping her attempts to reconcile the situation.
“Don’t let me interrupt anything, I realise I came earlier than expected. However it would appear as though you might need assistance with more than just you're nightly duties.”
As she said this she began to trace one of her hooves down Luna’s side, feeling her through the soft sweater, making a slow move towards her sisters marehood. Luna opened her mouth to protest but found it was quickly filled the toy that had been in her sister's mouth only moments ago. Lacking the capability to form words she struggled to make any noise of protest around the plastic Celestia was pressing into her, but her attempted cries were quickly converted into moans as her sister began to stimulate her nethers with her hoof.
Luna was beginning to get swept up into the advances from her sister but then the full magnitude of what was happening became clear and she forcefully pulled away. Ripping the toy from her mouth she turned around to face Celestia.
“Sister what has gotten into you?” she questioned.
“I just want to spend some more quality time with my beloved sister, we hardly get to see each other and I think our relationship would benefit if we got to spend some more ...intimate time together.” Celestia responded, placing extra emphasis on the word ‘intimate’.
“Surely you can’t really mean that, we’re sisters, we have known each other for such a long time, this is so sudden!”
“I really do, and by the looks of it you like the thought too.” Celestia said bringing her hoof to her face, showing off how wet Luna’s juices had made it before running her tongue over it. “And look how hard you have made me.” she continued bringing attention to her large member for the first time.
Luna had noticed it but had been hoping to not have to address it, but it didn’t look like she had a choice so she went for the obvious.
“How do you even have one of those? I know it isn’t normal”
“So you’ve checked before?” Celestia teased.
“What? No I…” Luna began, her cheeks going red.
Celestia decided to save her from embarrassment, cutting her off with the simple answer “Magic.” She put bluntly. “But it still wants you sister. And judging by the glancing you’ve been giving it I think you want it too.”
Luna could not deny that the fire of lust had been growing inside her ever since Celestia had entered the room, and after seeing the hard appendage sitting between them that fire had grown even hotter. She could not deny it any longer and she gave a weak nod to her sister affirming her need.
In response Celestia sat down on the bed, spreading her legs before her sister and placing a hoof on Lunas head, guided her down the shaft resting her face before her sizable sack. Luna took a deep breath inhaling the scent of her sisters recently acquired assets, committing to the lewdness of what was about to take place.
Beginning with a tentative lick Luna started to lavish her sisters balls with attention messily kissing them while taking turns sucking on each of the large orbs. They were too large to attend to both at once but she made sure to spread her love equally over the whole area before moving higher.
She began to run her tongue up her sisters shaft while continuing to massage her balls with her hooves, intent on coaxing more precum out before she got the tip. She stopped briefly at the medial ring shuddering a little at the thought of having it inside her. Upon reaching the head Luna eagerly lapped up the precum that had amassed there before glancing up at her sister to see her warm smile.
Urged on by Celestia's apparent enjoyment she spread her lips fully around her cock. Luna bounced her head up and down determined to take in more on every dive. She tried her best to massage the shaft with her tongue as she continued to pleasure it, taking great satisfaction the light moans her sister let loose.
When she felt the head hit the back of her mouth she readjusted before pressing on slowly at first but with increasing speed as the cock entered her throat. It had been quite some time since she had laid with someone of this size but she would not let that stop her from taking the whole thing.
As Luna worked she felt celestia move her hooves down under the hem of her sweatshirt, tracing her body and enjoying the heat that was building up inside it. At the same time Celestia used her magic to move the dildo from before down to lunas mare hood easily slipping it inside eliciting a pleasurable moan around her cock.
Motivated further by her sisters advances Luna quickly made her way to the base of the shaft holding still for a moment enjoying all the wondrous sensations that were enveloping her body before moving her head back. She was eager to have a real cock in her pussy, the small toy would not do a moment longer.
Pulling her mouth off of the head of the cock with an audible pop she immediately went to kiss her sister. Luna wasted no time pressing her tongue into Celestia's mouth, who was more than eager to reciprocate. Meanwhile Luna was already starting to angle her sisters shaft downward spreading her legs wide, waiting for the her tiny toy to be replaced with the real thing. Mercifully she didn’t have to wait long for Celestia to remove the toy and press her cock head against her sisters cunt.
“Are you ready LuLu?” She asked breaking their passionate kiss.
“Yes! Please fuck me Cely!” Came the enthusiastic response though heavy breathing.
Without hesitation Celestia thrust forward spearing her sister on the first few inches of her cock. Luna let out a scream of delight as her sister continued to fuck her deeper and deeper determined to fill every inch of her sisters snatch.
The kiss resumed in renewed passion their tongues wrestleing for domiance within each others moan filled mouths. Celestia used her magic to move the discarded toy to a new location, pressing its tip against her sisters back door, silently asking for permission. She took Luna’s awkward attempts to thrust onto it as an affirmative, pushing it inside eliciting a small gasp from her sister followed by a renewed vigor in their makeout session.
Luna was experiencing a level of pleasure she had never felt before due in no small part to the fact that it was her sister who was fucking her. The thought was more appealing to her lust filled mind than she would like to admit but right now her reservations were pushed to the side making way for more intense feelings as she neared her climax.
Luna had her orgasm as soon as Celestia hilted inside of her, her inner walls clamped down on her sisters cock as it kissed her womb. Hearing her sisters squeals of delight Celestia edoubled her efforts pulling her cock almost all the way out before slamming it back in with the sound of flesh against flesh echoing throughout the room as her hips smacked Luna’s ass.
“Sister, I’m close” Celestia warned
“Do it inside! Fill my womb with your seed sister! I want all of it!” Lana screamed through labored breaths.
With that encouragement Celestia thrusted faster before hilting herself one last time as her cock head flared. Massive thick ropes of cum painted Luna’s insides as her sisters cock throbbed inside of her filling her completely until eventually becoming too much and spilling out her entrance.
They embraced as Celestia rode out her orgasm attempting to resume their kiss, Luna struggling to return the gesture through the immense pleasure. The heat between their bodies reminded Luna of how close they were now, sharing a connection even greater than sisterly bond.
As the cock within her began to soften Luna pulled back letting a sizable amount of cum leak out and soak her bedspread, but she didn’t care. She pulled her sister down beside her and cuddled silently in her arms while they both calmed down.
“You planned for this from the start didn’t you?” Luna broke the silence with a question she already knew the answer to.
“Yes, I have always admired you sister. I really would have loved to just spend the night with you but it was obvious that you were just as willing as me, if a little reluctant to admit it.” Celestia responded in a soothing tone.
“I do still have my duties to complete tonight, but perhaps I could stop by your dream and we could continue our time together there?” Luna said with a wink.
“Please do sister.” Celestia said drowsily. “All that caffeine is wearing off, I could just go to sleep right here.”
Silence followed as Luna allowed her sister to rest. She had just been through a strange new experience but she was already eager to repeat it. Perhaps the realm of dreams could provide a regular meeting ground each night. She was excited to see where her relationship with her sister could go now that they had already crossed a great line.
She slowly stroked Celestia's hair as she slipped into sleep
“See you soon Cely.” she whispered soothingly.
Author's Note
This is my first story and it probably shows 
. So feel free to point out any errors I may have made.
That being said thank you to DarkRyu and the Incest is Wincest group for giving me some motivation to write something. I've had an interest for a while and had lots of fun writing this story.
