Just This Once

by n3k1dsk1llz

Rating: mature
Tags: Applejack, Slice of Life, My Little Pony: Friendship is Magic, Rainbow Dash, Romance, Big Macintosh, Sex, Sugar Belle
Length: 4668

When Big Mac agrees to meet with another couple for some sexy fun, he doesn’t fully know what he’s getting himself into. He’s about to go on an emotional rollercoaster of self discovery as he explores himself, his sister’s friend, and…his sister?

When Big Mac agrees to meet with another couple for some sexy fun, he doesn’t fully know what he’s getting himself into. He’s about to go on an emotional rollercoaster of self discovery as he explores himself, his sister’s friend, and…his sister?

Written for First-Time February and submitted just under the deadline.

I'd like to thank all the members of the Adult Writers Discord for all their input and support.

Special thanks to the following:
WaywardSon--for helping me keep it emotionally balanced.
Atom Smash--for staying up late to give it a final polish
Arkadios--for his super fast last minute edits

Published 2022-03-01 03:00:00 UTC
Last updated 2022-03-15 23:29:02 UTC

Chapter 1

Big Mac couldn’t believe what he was hearing. His beautiful wife was telling him that she found a really nice couple and wanted to…have an orgy. He shook his head but stopped himself from asking her to say it again for the fourth time. Her cute eyes softened him up all the time but he tried resisting on this one. He was a one-mare stallion even if his wife wanted him to…experiment. He turned away and walked out of the barn with a “Nope!”

*********
A week later, Sugar Belle scooted just a little bit closer to Big Mac in bed and started talking. “I was talking with Pinkie Pie the other day and she told me about an adult party she had a few months ago. There were a few different stallions and mares from around Ponyville there doing all sorts of fun adult things.” Sugar Belle giggled. “Pinkie said she was glad she thought about renting out the spa. It made clean up a lot easier.”

Big Mac sighed. “Why are you telling me this, Sugar Belle?”

She draped a hoof over him and started tracing little circles on his chest. “I don’t know. It just sounds like fun, doesn’t it? Cutting loose with friends. Letting them touch you as something other than friends for a night. Doesn’t that sound fun?”

“Nope.” Mac rolled on his side away from Sugar Belle, hunching slightly out of her reach. He didn’t like that idea one bit.

***********

Another week later, she was on top of him in their bed. She was so beautiful and she knew just how to rile him up. She leaned her muzzle down to his cheek and gave him a soft kiss. Then she lifted her muzzle to his ear. “Wouldn’t you love to feel another pussy while you watch your wife get pleasured by another pony?”

“Nope!”

Big Mac sat up in bed, causing Sugar Belle to slip off his barrel to the floor. He stomped to the door and opened it to a stunned Applejack. She wasn’t expecting her brother’s door to be ripped open like that. Big Mac stammered and shifted to hide his boner as he slammed the door, but in his embarrassment, he slammed it too hard, causing it to fall off the hinges.

Panicked, he shoved past his sister and ran for the bathroom down the hall, cock slapping his belly all the way. He barely made it to the bathroom before his cock exploded all over the floor. He slumped to the floor unable to enjoy any sort of afterglow from his impromptu public masturbation. He stared at his spunk all over the floor and let his mind wander.

His wife was asking for something that she really wanted. He knew this. He had committed to her and wanted to give everything to her, but the concept of an orgy was so foreign to him. He knew that plenty of other ponies did it and they all seemed okay. Heck, the Cake twins were from one such gathering. It was a bit controversial when that was revealed to the town, but everypony seemed to forgive and forget in a matter of minutes. And the main upset wasn’t even that they had the orgy. Ponies were just mad that they tried to lie about it.

But the other issue was…He had never felt this way about anypony except Sugar Belle. Even as a young colt, Applejack going through her heat never really bothered him. He knew that some siblings had no control over themselves and ended up rutting each other through the season, but it had never been an issue for him. He actually wondered if he was gay for a while because he just wasn’t attracted to any of the mares in town.

But then he met Sugar Belle.

She made him feel everything. He felt love. Real love, and not that horrible obsession that came from the love poison. He felt passion and desire in his pursuit of her. He felt attraction to a mare, both physical and emotional. And last, but certainly not least, he felt horny when she was around. She awoke so much in him and he loved her so much for it.

And now she wanted to have him share all of that with somepony else. It just felt so wrong.

He got up and cleaned up the floor. After one last look in the mirror to pump himself up, he opened the door and walked back to his room. The door was leaning against the wall and AJ was talking quietly with Sugar Belle while they both sat on his bed. The briefest thought that his sister was probably sitting on a cum stain crossed his mind before he shushed it away and spoke.

“Sugar Belle, can we talk in private?”

Applejack stood and patted Mac’s shoulder on her way out of the door. “I’ll keep Apple Bloom downstairs while you guys talk.”

Mac nodded and turned back to face his wife. She looked a little scared and Big Mac felt really bad about that. He plodded over and sat on the floor next to her so they could be eye to eye.

“I did some thinkin’ down the hall. I realized that I want to give this to you, but at the same time, it feels like you’re asking me to give away this wonderful gift that you finally woke up inside me. I don’t fully feel proper doin’ somethin’ like that.”

Sugar Belle placed a hoof on his shoulder. “I should apologize, Big Mac. I shouldn’t have asked you that way. I just…I was thinking if you were riled up, maybe you would agree. Applejack told me that was “downright dirty” of me.” The side eye from Big Mac forced elaboration. “I didn’t tell her details about what we were doing or what I asked. But she’s smart enough to know a few things.” She pressed her head up to his. “We are married you know.”

Mac couldn’t help but smile at that. She was his wife. And she was an amazing wife. He knew she loved him with all her heart. He pulled her into a hug squeezing her right to the point where she loved it. He put his muzzle to her ear.

“Let’s do it.”

Sugar Belle pushed out of the hug and stared at Mac with eyes like saucers. “No! Big Mac if you don’t want to, I’m not going to force you. You are far more important to me than any fantasy.”

He raised a hoof to calm her reaction. “I know what I said. But you’re important to me, too, Sugar Belle. I love you with my whole heart and I know you love me the same.” She grabbed his hoof at that and nodded while Mac continued. “This is something you really want to try and pushing myself to be a bit more adventurous is a good thing. Celestia knows I like to push myself in O&O.”

Sugar Belle giggled. “Did you finish making your Lancer yet?”

Mac chuckled. “No. Soon, though. But what I’m sayin’ is that I want to do this. I want to do this for you and with you. Because I love you.”

He smiled and watched the sparkles grow in his wife’s eyes. She pounced on top of him and gave him everything he liked.

They forgot the door was open.

Chapter 2

The train to Manehatten had been a long one. Big Mac had had a long time to think about what he would be doing when he got there. He nearly talked himself out of it several times. But then he always came back to Sugar Belle leaving early to get the hotel room set up. He had to make the trip if for no other reason than to pick her up.

The walk to the hotel had been pretty uneventful. The crowd of ponies in the big city certainly didn’t care about personal space and would shove by him here and there, but the directions were clear and he didn’t get lost. He nodded to the door pony as he walked through the door. Still following his directions, he got on the elevator and headed up to the eleventh floor. They didn’t get a suite, but Sugar Belle said they had indeed had a large room. It would be plenty big for the evening they had planned. Plus the hotel assured them that the room had been made with earth pony strength in mind.

There it was: room 1147. He knocked on the door and was quickly greeted by his beautiful wife. She wrapped her hooves around him and pulled him in for a kiss. She pulled him into the room and sat him on the couch. Another knock came on the door right as he sat down. Sugar Belle ran to answer the door, excitement written all over her face.

“Hey, Sugar Belle.” That familiar voice of Rainbow Dash made Mac Crane his neck to look at the door.

“Hey, Rainbow Dash. Where’s your marefriend?”

Rainbow Dash chuckled. “She’s not really my marefriend. Not officially. I’m hoping to change that soon, though.” Rainbow Dash walked into the room. "Hey, Big Mac."

He waved silently, mulling over what he was about to do with his sister's friend. He pictured her under him, her rainbow mane slick with sweat while he pounded her pussy. Then she was on top of him looking down directly into his face while the sweat dropped off her body and onto his.

He felt a slight stirring in his loins, but it settled quickly. He turned his attention to his wife. So beautiful. One wink from her and he'd be ready to go in no time. He allowed his eyes to roam over Sugar Belle's body. From her ears, down her back, all the way to her...flagged tail. She was flagging. She was chatting with Rainbow Dash and had her tail up as high as it would go, letting her scent fill the room.

Mac couldn't help but breathe it in and enjoy it. He felt his cock wake up and didn't worry about it. If she was flagging, he was gonna enjoy it. He relaxed into the couch, allowing his stallionhood to grow as he continued watching the two mares chat. They were laughing and getting awfully close to each other.

He let his eyes wander over Rainbow Dash. She was actually pretty in her own athletic, pegasus way. He did always enjoy looking into her eyes. His eyes were then drawn to her wings as she laughed and fluffed them out. She could do so much with those wings. He’d seen it. Mac began wondering what it would feel like to have them trailing over his body. His loins began to stir once more.

But his loins didn’t settle down this time. He began eyeing the pegasus a little more hungrily, filling his mind with her tight muscles, her lean physique, and those gorgeous eyes. She noticed him staring and smirked, but before he could feel embarrassed about it, she pulled Sugar Belle into a deep kiss.

A moment later she broke the kiss, flashing Big Mac a devious grin. Then she answered Sugar Belle’s unspoken question. “That was for Mac.”

Sugar Belle turned around, finally looking at her flustered husband since Rainbow Dash had arrived. All he could do was offer a sheepish grin which made her chuckle. “You weren’t expecting Rainbow Dash, were you, Big Mac?”

She turned around and walked back to Big Mac. He got lost in her eyes as she wrapped her hooves around him and began those teasing pecks that drove him wild. She trailed down his neck to his chest, where he opened his front legs and revealed his growing stallionhood. Rainbow Dash peeked around Sugar Belle. Stars filled her eyes as she took in the whole length of Big Mac’s rod.

Rainbow Dash stuck her tongue out and licked the base of Mac’s cock causing him to jerk away and stare at Rainbow for a moment, her look of shock doing nothing to calm him down. A calming hoof on his chin brought his gaze over to his wife. “It’s what we’re here for, right? To share in some fun?”

He nodded and took a breath. Turning back to Rainbow, he said, “I’m sorry, Rainbow Dash.”

Rainbow scoffed at him. “Don’t sweat it, big guy. It’s fine to be nervous about new stuff.” She looked down at his cock then back up to him. “So…you want me to keep going?”

He was about to nod when a question of his own formed. “Should we wait for your marefriend?”

Rainbow waved a hoof. “Nah. She has the other room key, so she can let herself in. Besides, she likes to watch a bit anyway.” She chuckled and ran a hoof up his length.

Big Mac stiffened at the touch, but soon relaxed into it. Her hooves were a different temperature from his wife’s. They were cooler, but softer. Her eyes met his and he nodded. She opened her mouth and took the tip of his cock in. He sucked in a breath at the sensation. While her hooves were cooler than Sugar Belle’s, Rainbow Dash’s mouth was hotter. His breath quickened as he watched his wife sit in a chair across from him to watch this new mare suck on his cock.

Sugar Belle spread her legs and began slowly rubbing her hoof up and down her moist slit. He watched her eyes trailing up and down his body and finally landing on the rainbow maned pegasus working her way around the tip of his cock. The tongue swirled around his flare while his wife pushed the edge of her hoof between her lips. The tongue flicked at his hole as his wife brought her hoof up to lick it clean. Big Mac was really starting to relax and enjoy himself as the door to the room opened.

“Howdy, y’all! Sorry I’m late. Rarity needed more than—“ Applejack froze, locking eyes with Big Mac. Big Mac’s world dropped away, leaving only his little sister and the deep deep shame of getting caught by family. Her eyes began taking in the whole scene. Sugar Belle was mid-lick on her hoof, Rainbow Dash trying her best to take all of Mac’s cock in her mouth, and a dumbfounded Mac that never once considered that Rainbow Dash’s marefriend might be the pony that she always hung out with: His sister.

“WHAT in Tarnation is goin’ on here?!” Applejack’s eyes were wild, filled with confusion and just a hint of anger. Mac could feel the fear building as he knew what an angry Applejack was capable of. He felt his body tense and get ready to dodge thrown objects.

“What the heck!?” Rainbow Dash stood and stared at the once huge cock going soft and retreating back into its sheath. The outburst was enough to tear his gaze from his sister. He looked down at Rainbow Dash between his legs and glared. Applejack’s glare landed, then Sugar Belle’s, causing Rainbow Dash to shrink down under the attention.

“Uh…heh heh. What’s wrong, guys?” Rainbow Dash tapped her hooves together nervously while she surveyed the room. Then she turned to Applejack and threw her hooves into the air. “Oh come on, Applejack! I see the way you stare at your brother when he’s working.”

Rainbow Dash approached her marefriend, throwing a foreleg over her withers. “I’ve seen how your eyes linger for a second when he’s picking up those heavy baskets of apples, or when he’s dripping with sweat and still bucking with everything he’s got. Heck, the other day, you were pretty much staring at his junk when he was loading the cart for the market.”

Applejack pushed her away. “I was not! I was…uhm…” her eyes landed on Big Mac once more. He saw her scan him up and down as her blush deepened.

At this point, Sugar Belle stepped over and pulled Applejack into a gentle hug. “I’ve seen it too, Applejack. And it’s okay. We all have desires.” She looked at Rainbow Dash. “I just wish we would have known you were coming so that we could be better prepared.”

Mac shifted his gaze between Sugar Belle and Rainbow Dash. Were they really saying what he thought they were saying? Applejack’s gaze met his once more, this time containing guilt and sadness. He stood from his place on the couch and walked up to his sister. Sugar Belle and Rainbow Dash backed away to give them a little bit of space.

“Is all that true, Applejack?”

She looked away a moment before looking back with tears forming in her eyes and nodding. Big Mac lifted her chin with his hoof and kissed her. Immediate tension melted quickly and her lips opened to receive his kiss fully. He felt her tongue graze the tip of his as he pulled back to nibble her bottom lip. He stood to his full height once more and took in the sight of bliss on his sister’s face.

As her eyes opened once more, Big Mac smiled down at his sister. Her smile quickly melted away as a look of panic settled over her. “Oh Mac! You shouldn’t have done that. It ain’t right for siblings to do this stuff. What would Granny Smith think?” Her eyes grew wider as she reached up and pulled his face down to hers. “What would Apple Bloom think?”

Rainbow Dash and Sugar Belle pulled Applejack off of her brother and worked on calming her down.

“Relax, AJ. He’s obviously into it if he’s gonna kiss you like that.”

Sugar Belle rubbed her back. “It’s fine, Applejack. As far as I’m concerned, we’re just four consenting adults in a hotel room for an evening of fun.”

Applejack glanced at Rainbow Dash who smiled. “Is this what you want, Dash? You want to have an orgy with my brother and his wife?”

“Of course it’s what I want. We wouldn’t be here if I didn’t want that. But what do you want, AJ? If you want to leave, we can leave. I won’t be mad.”

Applejack nodded and looked back up at her big brother. “And what about you, Big Mac? Is this something you really want? Or are you just letting mare folk push you around into it?”

Big Mac thought about that for a moment, but quickly decided that wasn’t the case. “Nope. I’m here because I love my wife and I’m open to the experience. But just like they said, if you don’t want to, we won’t do anything.”

Big Mac watched his sister start to consider everything. She pressed her hat to her chest and looked around the room. Big Mac could see the gears turning in her head. Then she put her hat back on and Big Mac knew her decision had been made. She looked up into his eyes and her excitement was infectious.

“Let’s start this rodeo.”

Chapter 3

“Alright, I brought some games to help us get a little more comfortable if we need it.” Rainbow Dash grabbed her saddlebag and started rummaging through it. Applejack placed a hoof on hers and stopped her.

“I think we’re a little past games by now, sugarcube. Besides, weren’t you in the middle of something when I walked in?” Applejack’s eyes wandered over to Big Mac as a soft grin spread across her face. Rainbow Dash lifted her head up and smiled across to Big Mac. She leapt across the room, landing with her snout just under his balls. The sudden contact made him squirm, but only a little, quickly settling into the feeling of Rainbow Dash nuzzling his scrotum.

He watched his wife cross the room to his sister. Sugar Belle smiled and placed a hoof on Applejack’s cheek, pulling her into a soft kiss. Along with the visual and physical cues, the smell of mare musk soon filled the room and Big Mac began to be overwhelmed. His cock rose to full height quickly and Rainbow Dash began licking her way up his shaft. At his head, her tongue swirled around his flare once more. He loved that feeling so much, especially when he got to watch his wife and sister make out.

He began to absentmindedly thrust into Rainbow Dash’s mouth while he watched the two most important mares in his life. His flare was teased, then his sister moaned while Sugar Belle worked her magic on the neck, then the musk filled his head as he tried to take a breath. “Rainbow, I’m—“

He guessed it was enough warning. She braced her body and he felt her lips lock around his tip as the first shot exploded out of his cock. He grunted, throwing his head back on the couch. Each shot was followed by a quick swirl of Rainbow Dash’s tongue around his cock head. He didn’t know how long it took for his dick to stop pulsing, but he could barely lift his head when it did. With one last swirl of her tongue, Rainbow Dash pulled her mouth off of his softening cock. Then, a tap to his belly forced him to lift his head and look.

There between his legs, Rainbow Dash sat with her cheeks stretched out farther than he thought was possible. Once she knew he was watching her, Rainbow Dash stood and walked over to Sugar Belle. They pressed their lips together and Rainbow Dash fed his cum into Sugar Belle’s mouth. When about a third of it was shared, she pulled away and moved to Applejack. She placed her hoof on Applejack’s cheek and gently pulled her in to meet her lips. Applejack moaned softly as Big Mac’s cum was pushed into her mouth.

When half of the remainder was gone, Rainbow Dash pulled away once more. Big Mac looked over at his wife. She showed him his cum in her mouth before swallowing it for him with a smile. When he turned his attention back to Rainbow and Applejack, his sister had turned toward him and began walking up to him. Her cheeks were still bulged with his cum as she sat down in front of him. Their eyes met once more and she swallowed.

Big Mac dove down and pressed Applejack to the floor in a deep kiss. His tongue invaded her mouth, tasting himself and her tongue in the process. She wrapped her hooves around him and held him tight, not letting move away. Big Mac felt his cock begin to rise once more and soon it was pressing against his sister’s sex. She gasped and broke the kiss, staring up into his eyes.

Big Mac thought about his wife sitting three feet away. He thought about Rainbow Dash staring at them after giving him a great blowjob and swallowing his cum. Then he thought about the moist heat he felt at the tip of his cock. Without breaking their eye contact, he asked, “Are you ready, AJ?”

Applejack took a deep breath and nodded, bracing herself to receive her brother’s massive cock. Big Mac leaned down and kissed her once more as he pushed forward into her most intimate place. Applejack let out a grunt and Big Mac froze, lifting his head and watching to make sure she was okay. After a second, she looked up at him and nodded for him to continue. Big Mac continued forward and soon hilted himself in his sister.

He looked into her eyes as she looked into his. A smile spread on his lips that she mirrored. Then she chuckled. He chuckled in response. Then they were both chuckling and soon laughing. Big Mac pulled his sister up into a hug as he sat up and his cock fell out of her pussy. They leaned back on the couch together and laughed in each other’s hooves for a few minutes.

When they calmed down they smiled at each other before looking across the room at the others. Sugar Belle was smiling softly with watery eyes, but Rainbow Dash looked confused. She glanced back and forth a few times between Applejack and Big Mac before finally throwing her hooves up in the air.

"What was that?! It was super hot until you started laughing."

Big Mac tightened a foreleg around Applejack and gave her a soft noogie. "Well, we are siblings." Then they both began to giggle again.

Epilogue

The harsh lights of the hallway stung his eyes as Big Mac left the dark hotel room. By now he was used to letting Sugar Belle sleep in a bit whilst he got his day started, and with how vivacious they were last night, he couldn’t imagine Rainbow or AJ being awake either. He half-stumbled down the hall to the elevator on a quest for the continental breakfast. He knew he was probably still too early for it, but his farm work lifestyle forced him to get up early like this.

When he got out of the elevator, a familiar stetson was there waiting for breakfast. His sister was sitting against the wall, clearly lost in her thoughts. He knew that look. She was doubting herself and possibly her whole life. And seeing her like that was making him doubt himself, too. He walked over and sat next to her, ready to be her supportive big brother just like he always was.

After a couple minutes, she began to speak. "We did a lot of things last night."

Big Mac nodded. "Yep."

"We did a lot of things...together."

"Eyep."

"It was so much better than all my dreams I've had. It was so warm. And safe. I don't even fully feel like that when I'm with Rainbow." She reached up and pulled her hat down over her face. "Don't tell her I said that."

Bic Mac smiled at his sister. She was always so worried about her image, just like her marefriend. It was their main reason for disagreements. Applejack straightened her hat and looked up at him.

“Are we okay? Is it wrong that I’ve wanted that for so long? Is it wrong that…you gave it to me?”

He thought about that. Whether or not they should have had sex never crossed his mind. All he knew was that she was his sister and he loved her with everything he had. He reached a hoof out and wrapped it around her shoulders, pulling her close.

“I love you, Applejack. You love me. I think that’s all that matters.”

She relaxed into his chest and returned the hug. “I do love you, Big Mac.”

Big Mac kissed the top of Applejack’s hat as he tightened his hug. She lifted her muzzle and pulled him down for another kiss. Tender lips met as they shared their new depth of love. A loud Ka-Chunk snapped them back to the present and they turned to face the doors opening to the breakfast hall. A few ponies were finally beginning to make their way to the hall as the sun began to peek around the tall buildings of the city.

Applejack and Big Mac walked in and began piling their plates high with muffins and fruits and yogurt. They sat and ate while they talked about plans for the farm and plans for another hotel stay. They had a lot of fun and would need to do this again, but they did have a farm to run. A new chapter in their lives had begun and they were going to enjoy it just as much as all the others.

Author's Note

And now this story is complete.

It didn’t feel complete when I submitted it for the contest, but I think this puts a nice bow on things. I hope you enjoyed it.