Fiery Hearts and Sibling Love

by SamSwordsman123

Rating: mature
Tags: Slice of Life, Alternate Universe, Original Character, Porn, My Little Pony: Friendship is Magic, Princess Cadance, Romance, Sex
Length: 4083

Cadance has a special gift for the pony who is both her little brother and cousin on his birthday.

This story takes place in the same universe as Element of Balance.

Prince Fire Sword lives with his mother Princess Celestia in Canterlot Castle. His birthday comes one day and his cousin whom he views as a sister, surprises him with a bonus gift. An invitation to her room so she can give him his first ever sexual experience.

First sex related fic so don't be too hard please and offer feedback for improvement. Also please respect that I have a different view on alicorns NOT being immortal as a whole.

Also if you feel the romance tag doesn't belong I will consider removing it.

Includes, anal, vaginal, blowjob, and semi-incest.

Published 2023-10-23 06:00:00 UTC
Last updated 2023-10-23 06:00:00 UTC

A Sister Figure's Gift

Prince Fire Sword, natural born alicorn son of Princess Celestia, awoke in Canterlot Castle. For a while he just lay there in his red covered bed. But soon the drowsiness wore off and he got to his hooves, stretching them and his wings out. He took a quick shower, then emerged and dried himself off. He looked in the mirror and saw himself. He smiled at his reflection, everypony told him he was handsome and he couldn’t disagree. His white fur that he’d inherited from his mother, his mane that had the fiery combination of red and yellow, his gold eyes. Then came on his equally gold crown encrusted with rubies that he levitated with his red magic that matched the jewels. He smiled as he saw himself as a prince should be. Handsome, but also good and strong, unlike a certain other prince who was vain and rude.

Fire sighed as he made his way out and joined his mother for breakfast. Also seated with her was Cadance, the beautiful pink alicorn princess that had earned her horn a short time after Fire was born. Celestia had adopted her as an honorary family member and Cadance had helped take care of Fire when he was young. She was kind, smart, and could spread love wherever she went. A true princess of Equestria just like her aunt and Fire’s mother. Though, Cadance was more to Fire then just a cousin. She was like the big sister he’d never had, the Perfect Princess Big Sister that was. They’d never had a fight in their lives, a little competing over who was the best flyer or magic user.

“Good morning Fire,” Celestia greeted as he entered the dining room.

“Morning Mom,” Fire said.

“Hello my Perfect Prince Little Brother,” Cadance said as he sat down next to her.

“Hello to you as well my Perfect Princess Big Sister,” Fire grinned as he leaned over.

They performed their signature greeting to each other, kissing each other on the cheek. Just as Cadance did that ‘Sunshine Sunshine’ rhyme with that young filly she foalsat, she and Fire had their own routine.

“Happy birthday!” Cadance said.

Fire grinned. Today was his big day where he’d have a celebration in the castle with his friends and family. The royal guards would put on a jousting tournament in the grounds and Fire would be partaking as well. That would be fun.

“Thanks,” Fire said.

They ate their breakfast that Celestia had made. Pancakes with smiley faces on them. Even though she was ruler of the nation she liked to cook her own breakfast every so often. Fire ate it all up and then headed out for a morning flight. He flew through the air, overlooking Canterlot’s immense city. It was a beautiful area, being the royal city. Of course, he knew not everypony there was friendly. He’d known that from a young age, seen how a fair number of the nobles looked down on other ponies. He’d decided to have a little fun with those nobles and pulled a few pranks on them. Of course that got him in trouble but it was worth it he felt.

He enjoyed his flight then read a book in his room till noon. Then his party began in the castle courtyard. He saw many ponies that he’d personally asked for. His classmates from the school of magic, teenage fillies and colts as well his mother and Cadance. Some of the nobility were there as well, but only the ones he liked or at least didn’t mind.

“Happy day to you, Prince Fire Sword!” Fancy Pants said as he waved.

Fire smiled at him. Fancy Pants treated even the lower class with respect and even did charities. He was a good rich pony who didn’t let his wealth go to his head. His entourage was there, and Fire knew some of them were simpletons who would change their minds on a whim to match Fancy’s.

“Welcome Fancy Pants,” he said with a sincere smile before looking at everypony else. “Thank you all for coming.”

His classmates from the School of Magic stepped forward. He saw Lyra, Minuette, Moondancer, Twinkleshine, and Lemon Hearts as well as others. Though he noticed Twilight Sparkle, the best student in class was missing. He shrugged. Enough had come.

“We would never miss one of our friends parties!” Minuette said.

“Nor our favorite prince!” Lyra added.

They got the party in full swing. First was a jousting tournament held in the royal game fields by the royal guards. Fire would have liked to partake himself but most of the guards were still just a bit bigger than him. Maybe next year. Their lances met and one of the guards, a unicorn stallion with a blue mane brought down his Earth Pony opponent.

“Well fought Lieutenant Shining Armor!” Cadance cheered next to Fire.

The unicorn looked up at her and blushed. Fire grinned and looked from him to Cadance.

“I bet he would like a kiss as a reward,” he whispered to Cadance.

She blushed as well. He knew they both had an attraction to each other.

“Well maybe he will get one… someday,” she said.

After the jousting came the presents, Fire got many things like a fine red suit and cape from Fancy Pants, a book on the history of wars in old Equestria from Moondancer, a lance from his mother…

“You should be old enough to use it next year,” Celestia said. “I can’t hold you back any longer my little pony.”

“Thanks Mom,” Fire said.

He then opened Cadance’s present. A suit of armor like the royal guards, but more elaborate. It was adorned with red paint over the gold tinted metal.

“I got that a little bigger so you could grow into it,” Cadance said.

“Thanks sis!” Fire said as he hugged her.

She smiled and whispered in his ear. “Come to my room after dark. I’ve got another present for you… but it has to be our little secret okay?”

Fire was surprised but nodded. “Okay.”

They had cake and Fire soon bid everypony goodbye. The servants took his presents to his room and he put them where he desired. He then waited until his mother lowered the sun and rose the moon with the special powers that gave her her immortality.

Many assumed that she’d lived so long because she was an alicorn, but those ponies were wrong. It was the power of the sun and moon that allowed his mother, and his aunt still trapped in the moon, to live without the fear of aging. Celestia had told him of this truth around a year ago after his last birthday. Fire had been slightly relieved, after reading Buck Everlasting he wasn’t so sure he liked the idea of immortality. But that did mean his mother would eventually outlive him… unless she gave up the power of the sun and moon. Fire put that aside, it didn’t matter right now. He looked up at the lovely moon, where he could see the mare inside it, his Aunt Luna. She’d betrayed his mother due to the jealousy of ponies preferring to frolic in the sun brought by Fire’s mother instead of her moon. Fire stepped outside onto his balcony to get a better view of the night sky. It was beautiful, the stars shined everywhere. If only some ponies had spent time stargazing, that betrayal could have been averted perhaps. He sighed, knowing there was nothing he could to change the past.

He flew up to Cadance’s tower and knocked on the back door.

“Come in!” Cadance said from inside.

Fire opened the door with his magic and closed it behind him. He was surprised to see Cadance not standing but laying on her bed. She grinned at him as she saw him. Her room was lovely with pink wallpaper that bore hearts, fitting for the Princess of Love. She had a sky-blue covered bed that added a nice contrast to the wallpaper and matched her magic. A dresser was nearby to hold her occasionally used clothes and a jewelry box on top of it. A desk was also present in front of the bed, and on the bedside table were a few frames pictures. One of her Earth Pony parents, another of her and Celestia with Fire as a baby just after Celestia had adopted her as a niece, and one of her and Fire. Lastly, she had a scrapbook as well with pictures of various fillies and colts that she foalsat like Twilight Sparkle.

Fire looked at her in confusion.

“Uh, where’s my present?” he asked in what he hoped wasn’t a demanding tone.

She grinned at him. “I AM your present little brother!”

Fire frowned at her. “What do you mean? You’re not a present, those can only be objects not ponies!”

Cadance giggled. “I want to share something very special with you tonight! Surely you’ve been educated about… sex?”

Fire’s eyes widened. Sure he’d been given the lesson at the School of Magic when he turned thirteen two years ago.

“You… wanna have sex with me?” he asked dumbfounded.

She giggled. “Yes, but don’t mistake this as me being in love with you! I am the Princess of Love! Therefore, it is my duty to spread love, and occasionally I give a lucky colt a good time on his birthday! You are my favorite colt around here so I have to do it for you little brother! I want your first time to be with somepony who loves you!”

Fire was… conflicted about this. He was tempted though, his cheeks turning red. “Uh, I guess I understand but… what if I get you pregnant?”

She chuckled. “I’ve already cast an anti conceivement spell on myself so there’s no risk of that! With how many stallions from the royal guard I have in a month I’d definitely be pregnant by now if I didn’t know that spell!”

Fire sniggered. “I didn’t know you were a naughty little slut pony princess, sis!”

She scoffed. “Careful brother. I love you but I can still retract this offer! And don’t worry, once I find the right stallion there won’t be anymore of this. I’m still young though so I might as well live a little!”

“If you say so,” Fire said.

He thought back to when he’d been young and Cadance had foalsat him back before she’d become his big sister.

They’d play hide and seek, chess, and fly as well as practice magic or toy swords together. Eventually they collapsed from exhaustion after a game of tag and Cadance pulled him into a hug.

“I love you Fire,” Cadance said.

“I love you too Cadance,” he said. “Can I marry you someday?”

This caused her to laugh. “Oh you! You’re a little young for that right now!”

But she kissed him on the forehead all the same then said… “Maybe. We are both alicorns and from what I’ve heard we live a lot longer than most ponies, or even forever. Maybe it would be for the best if we did, I’d hate to have a husband that could only live a fraction of my life.”

Eventually they both learned from Celestia that it was her immense magic power that kept her from aging like a normal pony would. When that day came they made up their minds that they were more like siblings then lovers.

“I remember I wanted to marry you when I was a foal,” Fire said.

Cadance blushed as well. “I remember too. If Celestia had confirmed we as alicorns would both live as long as her, I’d probably have decided to be with you romantically. It’s not really taboo since we’re not blood related, and in olden days of Equestria ponies would marry their cousins quite often. Though that would be a health hazard for future offspring.”

“It still feels a bit weird doing this though,” Fire admitted.

“I know,” Cadance said. “You are my little brother, and you always will be that in my heart.”

She put her hoof over the mentioned part of her body.

“But right now, let’s just pretend we’re a couple in love! A handsome young stallion and an old mare like me!”

“You’re not that old! And if we really age super slow or not all after a certain stage, I’d probably catch up to you in no time!” Fire said.

They laughed for a moment.

Then Cadance looked at him. “Well, this is just a one-time thing, okay?”

“Okay,” Fire agreed.

“Come on, then!” she urged eagerly, adjusting herself so that her lower area was visible.

She put a hoof on it, it was already slightly moist. This was the first time Fire had ever seen a mare’s private area so clearly, as they were usually blocked by legs. He could smell the faint arousal as well, and caused his own lower section to grow hard.

He tried to take a step forward. But this was his first time and he was shy. He came a little too slowly for Cadance’s taste, only taking half steps forward.

“Looks like you need a little push, Fire!” she said as her horn lit up. “Luckily for you I have just the spell to help you overcome your nerves!”

She lit up her horn with love magic and shot it at him. All of Fire’s shyness melted away and he felt nothing but his love for her. Not the usual kind of love, this was an altered version of it. The romantic or perhaps lust filled love.

“Cadance,” he said.

She smiled at him as he stepped forward much quicker and climbed on her bed and on top of her. She was still a bit taller than him but she had little doubt he’d become the taller of the two of them in time. His cock lined up with her entrance and she closed her eyes as he slid inside her, earning a moan of pleasure.

Fire grinned down at his sister figure and reacted on instinct. Her walls were tight around him even though she was the larger of them for now. He wrapped his hooves around her back and pulled out a bit before pushing back in. She panted softly with his movement and he likewise moaned as well at the feeling.

She smiled up at him, cheeks red. When he thrusted back in she seized the opportunity to give him a kiss on the lips. He was surprised for a moment but quickly returned the kiss and embraced her. Then an idea occurred to him.

“Care for a flight my beloved cousin and sister? Or are you just my lover now?” he asked spreading his wings.

“I’m your lover for tonight birthday boy!” Cadance said before adding in a teasing manner. “Think you can lift me?”

He grinned and with the strength of an Earth Pony did so. He had more strength then she did thanks to his part time training with the royal guard. Cadance knew that she as an alicorn would grow bigger then most ponies, but did hope to find a stallion strong enough to dominate her. What mare didn’t love being submissive now and then?

Fire lifted her up and pressed her back against the ceiling of her bedroom, and pressed his lips to hers. She smiled through the kiss and pushed back. They rammed from one end of the ceiling to the other, creating slight thuds that may or may not have been heard by guards outside.

Cadance was soon pinned to the floor, Fire’s cock buried deep in her marehood which was wetter then it had been before they started. He was so long and big already, almost long enough to hit her cervix. His white lips ran along her pink neck and she took a moment to say something.

“Good thing the guards are used to my occasional night time visitors or we might have some explaining to do when they tell Aunt Celestia!” she said.

Fire shook. “Yeah! I know we aren’t blood related but she might have some reservations about this!”

“What sort of punishment do you think she’d give me for seducing her son?” Cadance asked half-jokingly.

“Oh, probably something like… this!” Fire said as he lifted her up and landed a good smack on her ass.

“Aah!” she yelped before forming a mischievous smile. “Oh, you naughty colt!”

And she pushed up and rammed him back to the top of the ceiling before following up with a flurry of kisses. She started on his lips then both cheeks and then did a blowkiss to his stomach. He laughed then startled tickling her, causing her to laugh uncontrollably and she fell. Fortunately, he was quick to pull out of her and catch her in a bridal style manner as he landed on his hind legs gracefully. She wrapped her hooves around his neck.

“My strong little brother,” she praised.

He panted a bit. “That was fun.”

She giggled. “It's not over yet. We have a few more positions to try! Put me on bed!”

He obliged, flapping his wings and carrying his big sister figure turned-lover for the night to her bed. He set her down gently and she put a hoof to her soaking wet pussy.

“Lick it!” she said.

“They do that?” he asked in surprise.

She nodded. “I know it probably sounds disgusting but it will taste good!” she said.

Fire hesitated, the effects of the love spell wearing off. This time Cadance was patient and only had to wait a moment before he got before her and brought his mouth down directly before it and his tongue quickly followed. Cadance moaned she felt it move around her folds. He sucked on it, moving his tongue about and moaning as well before pulling away.

He licked her fluids off his lips. “Mhmm, tastes like cherry. I prefer grape but ah well!”

“Oh really?” she asked with another mischievous grin and her horn lit up again. “Try this then!”

Her magic flew up for a moment and traveled down into her vagina. Fire looked at her in surprise.

“There are spells for this?” he asked.

“Lovers Magic 101,” she said. “Take another taste!”

He did so, and to his surprise she tasted like grapes. He stopped for a moment and began eating her marehood more violently. She gasped as his tongue went through her at a faster pace that all but froze her in bliss.

“Oh! Ah! Ah! Oh!” she exclaimed, her eyes closed and her face burning red. “Yes, Fire eat me out!”

Her body produced more fluid in response to the increased stimulation. Slowly she could feel a climax approaching as he ate her pussy. This continued for several minutes and their shared moans filled the room. Cadance felt his tongue inside her, moving back and forth. The feeling built up and she had half a mind to tell Fire but decided it was best to surprise him.

Soon it released itself and squirted all over Fire’s face.

“Ah!” he exclaimed in surprise as his face was covered in white cum that just barely stood out from his fur. “Hey!”

“Sorry! That’s what happens sooner or later to either mares or stallions!” she said with a red face before getting on her hooves on top of the bed. “My turn! Show me that stallionhood of yours!”

He obliged and presented his erect member. She took it in her mouth and began to suck on it. The saliva of her mouth and the vibrations made him grow harder and he felt pleasure move up him. She continued her task for several minutes, the salty taste in her mouth as her head throbbed up and down.

Then Fire felt something, was it his turn? Sure enough, as Cadance continued to suck his dick he felt it get stronger.

“Hey Cadance, I think I’m gonna…”

It released into Cadance’s mouth, she swallowed the majority. A bit leaked out and dripped down her muzzle onto her bed. It was clear contrast on her pink skin. She let out a breath looking up at him with a bit of a wild lustful expression before snatching him and bringing him down onto her bed. She pressed her lips to his and put her tongue in his mouth, giving him a taste of his own cum. Fire quickly used his own tongue to pin hers down and his hooves did the same with her body as he got on top of her.

“The little brother beats the big sister,” he said once he broke the kiss before planting one on her forehead.

“I guess so,” she admitted. “Well, just one more area for you to enter inside me.”

“And what’s that?” he asked.

She rolled over on her tummy and presented her… Fire’s eyes widened.

“Leh!” he said in disgust. “You sure that’s sanitary?”

“It's fine,” she said. “If you’re really scared of germs little brother you can always wash up afterwards.”

“Right,” he said with a blush.

It wasn’t that he was afraid of germs, he just preferred not to get sick. He lined his cock up with Cadance’s asshole and pushed inside. She let out a grunt as he did so and felt him grab her flank. Her face pressed up against her bed as he began pounding her. For several minutes he fucked her ass senseless, hard enough to make her-

“AAAH!”

“Cadance you okay? Did I hurt you?” Fire asked in concern.

“A bit,” she admitted. “But the pain is nothing! That felt so good!”

He smiled and continued for a while longer, their grunts, moans, and pants filling the otherwise silent room. Then he felt it again.

“I think I’m gonna let it out again!” he said.

“Give it to me Fire!” Cadance screamed in a loud voice. “Fill me up! Get me pregnant!”

“Is that a challenge?” Fire asked.

“Maybe, of course you’ll lose!” she looked up at him as best she could and grinned.

“Good!” Fire said as he gave her his hardest treatment yet.

“Oh! Oh! Ah!” she squealed. “Oh yes my little brother! Make me yours!”

“Oh you want to be mine now huh?” he asked playfully. “Sorry but too little too late big sis!”

He hammered her until he let loose, his cum shooting inside her and she felt a slight sting at it. Her teeth clenched, but the pain soon passed and she took a breath as Fire stopped. He pulled out and fell on bed beside her. She got on her back and pulled him closer. The younger alicorn nuzzled the elder.

“Thanks Cadance, that was… great,” he said kissing her cheek.

“No problem,” Cadance said to her sibling figure. “You certainly are a natural. I’m sure you’ll please your mare someday.”

He smiled and wondered what sort of mare that might be out there.

“Everypony in Canterlot still thinks that might be you!” he said.

“Rumors,” she dismissed. “Someponies thought Celestia just turned me into an alicorn so you wouldn’t have to outlive a lot of wives you might take.”

“Glad I don’t have to worry about that,” he said. “But I worry about my mom. What happens to her when I’m gone?”

“She’ll carry on I suppose,” Cadance said. “You wouldn’t want her to forget to be happy just cause she doesn’t have you anymore would you?”

Fire shook his head. “No of course not.”

She smiled. “Aunt Celestia is strong. She’s managed to endure a thousand years with the pain of banishing her sister to the moon.”

They both looked out the window and saw the Mare in the Moon. It was sad, their Aunt Luna was up there, trapped. Fire sighed, another family member he might never know. He didn’t know who his father was and that was a constant sting. But he still had a wonderful mother who was also the ruler of Equestria, good friends that he occasionally hang out with at the school of magic, and a particularly loving sister figure.

He looked at her and gave her a final kiss before jumping off her bed.

“Night Fire,” Cadance said.

“Night. Love you sis,” he said as he made his way to her balcony and opened the door to return to his own room.

This was easily the best birthday so far.