Sunny was the day out on the apple farm. Applejack And Big Mac were both hard at work, harvesting as many apples as they could for a big school fundraiser. Applejack knocked the apples out of the tree with her strong back legs while Big Mac did the heavy lifting, moving buckets of apples over to a cart and filling it up. Together, they made a great team.
"Ok Big Mac," Applejack said. "Now we just gotta haul these apples over to the school, and we'll let the school make the delicacies."
"Eeyup." Big Mac Agreed. He put on the harness attach to a wagon with a huge pile of apples in it.
Applejack emptied the last bucket into the wagon and also harnessed up. Big Mac would normally be able to pull it himself, but it was especially hot, and the cart was almost twice as full as normal. Plus, as much as he wished it weren't true, he had developed a crush or his little sister. He didn't know what was wrong with him, what kind of pony did he have to be to be sexually attracted to his own sibling? Regardless, he enjoyed spending as much time with Applejack as he could, but he was too afraid to ever tell her how he felt. He didn't want to be forever shamed by his sister, or possibly... family. It was driving him crazy keeping the secret inside, but he knew he had to. Applejack finished harnessing up, and together they pulled the heavy wagon into Ponyville.
As they pulled the wagon into Ponyville, the sun started to come out, making it hotter, and it didn't help that they were pulling a two ton cart full of apples. Pretty soon, both Big Mac and Applejack were sweating and panting. They really needed to cool off. Halfway into Ponyville, they saw a vender selling frozen popsicles. They both agreed to take a quick rest, and enjoy a cool, delicious treat. They both removed their harnesses and bought two popsicles, then took shade underneath a tree.
They laid in the shade, Applejack was just looking at the sky, but Big Mac was looking at Applejack. Applejack didn't realize it, but the way she ate popsicles was actually... quite seductive. It was starting to turn Big Mac on, watching her tongue circle the popsicle, and imagining how good it would feel if she did it to him. Big Mac leaned back against the tree and closed his eyes as he thought dirty thoughts. A light smile came across his face, and his member started to unsheathe itself. Big Mac didn't even realize it, for he was too caught up in his imagination. However, Applejack did. She had glimpsed away from the clouds to see if Big Mac was almost done with his popsicle, only to see that he was caught up in the middle of a sexual fantasy. But she didn't look away, she couldn't. She was fascinated with the size of it, not knowing that her brother could possess something so magnificent, apart from his strength and character. She knew that it was wrong to be looking at her own brother's member, but curiosity compelled her, and it was making her wet. If it wasn't for the sudden realization that they were on a schedule, she would've been tempted to do other things...
"Uh, Big Mac?" Applejack said blushingly, while still catching glimpse of his shaft. "We should probably get going."
Big Mac opened his eyes to find that his shaft had grown to its entirety. He blushed and stammered as Applejack sat next to him. He was embarrassed at the fact his little sister had seen something so... private, but it was also slightly attractive. Still, he was speechless.
"Uh... Apples, I-" Bic Mac stammered panickedly.
"Its alright to be embarrassed Big Mac, it happens. I ain't gonna make a big deal out of it." She got up from next to him. "Lets just get back to deliverin' these apples, I'll give you as much time as you need." She started to make her way back to the cart and harness up.
Big Mac just sat that there, waiting for his erection to fade away, thankful that Applejack didn't make a big deal of the situation. But there was something he couldn't stop wondering about... what was she thinking about him? Was she disgusted, or ashamed? Even though it was without a doubt the most awkward and uncomfortable moment he has ever experienced, he wanted to know what was going through her mind. He didn't want this one accident to ruin the relationship between his sister. As soon as his erection disappeared back into its' sheath, he got up from the cool shady tree, and harnessed himself back up. Big Mac was still blushing as he pulled the cart beside Applejack, but Applejack kept trying to sooth him.
"Big Mac, don't worry about, really." She said, "Its perfectly natural if you get urges at unexpected times. Its not gonna make me think any less of you." Big Mac just looked away shyly. "C'mon, you got nothing to be ashamed of, we're family. I mean, its not like you really have anything to be ashamed of." Big Mac's head suddenly lifted at her words, and he looked at her. She blushed lightly, she was trying to cheer him up so badly, she didn't realize what she said. The both of them just blushed.
"Well... lets just agree to never tell anypony about this, please?" Big Mac said to Applejack.
"Agreed." She said. The two of them managed to quickly put it behind them, and they continued to pull the cart to the school.
It wasn't long until they reached the school and were exhausted again. There were pony staff to help unload the cart, which gave Big Mac and Applejack time to just sit and talk.
"So, do you want to talk about it more?" She asked looking at him.
"I'm not sure yet." Big Mac said staring into the sunset.
"Well, its your choice anyway, I'm not forcing you." She said. She placed a hoof on his shoulder, comforting him.
"I just, I don't know how to feel. You're my sister, and you've seen a part of me nopony else has." Big Mac sighed. "Are we gonna stay for the fundraiser?"
"Do you want to?" Applejack replied.
Big Mac looked at the cart as the apples were hauled into the school. "I think I'll just take the cart back. Now that it's empty, it won't be hard to pull." He went back to the cart and began to harness up.
Applejack went over to him, "Well, I'm gonna stay here and help out, I should only be an hour or two." She told him.
Big Mac nodded and then left. Applejack felt bad for Big Mac, but she didn't know would cheer him up. Maybe if she just gave him some space? Either way, she hated seeing him like this, and was determined to cheer him up no matter what, even if it meant admitting her deepest darkest secret...
One Hour Later
The day went on and Big Mac was already back at Sweet Apple Acres. What had happened earlier was starting to bug him less and less, and he was finally getting back to being his old self. He distracted himself by doing various chores, and was currently cleaning the stables. He was so focused on cleaning, he didn't notice Applejack standing at the doorway.
"So." Applejack said, leaning against the door, "I see you've kept yourself busy."
Big Mac turned to her, "Eeyup." He replied, "How was the fundraiser?"
"Great! We sold enough apple treats to buy the school new art supplies, and instruments." She said.
"Great!" Big Mac said happily.
"Y'know, this calls for a celebration." Applejack said grabbing a six pack from behind the doorway. "Apple ale?"
"Sure." Big Mac said putting down the broom to catch the bottle of ale Applejack had tossed to him.
Applejack approached him as he took a sip of the bottle. "So, how are you feeling?" She asked sympathetically.
"Better." Big Mac said taking a sip of the ale.
"Are you ready to talk about it?" She asked placing a hoof on his shoulder.
Big Mac took a deep sigh before responding, "Eeyup." Big Mac looked at his sister and after fighting it in his head for so long, he asked her, "What did you think? Seeing me... like that?"
"What do you mean?" Applejack asked back.
"What did you feel? Weird? Disgusted?" Big Mac asked desperately, trying to rush her answer.
"To be honest, it..." Applejack backed away slightly. "It kinda aroused me." She looked away. "Look, I feel like now might be the best time to tell you this, and I hate to admit it, but I feel... attracted to you, like you're more than just a big brother to me." She started frowning. "And I've felt that way for a while now."
Big Mac looked at his little sister, who had just told him her deepest darkest secret, and had no choice but comfort her too. He hugged her and held her close. It was then when Big Mac knew he had to admit his secret too. "Sis, I... I have feelings for you too. I've also had them for a while now, and... I'm just glad that now I can finally tell you without having the fear of being ashamed."
Applejack heard Big Mac's words, and hugged him back. "We shouldn't have to hold back feelings for each other just because of what we are, right?" Applejack asked. She was on the verge of tears. Her emotions for her brother stronger than she ever thought.
"Right." Big Mac said to Applejack as a single tear fell down his face, he could feel the passion between their beating hearts, and even though what they were about to do was wrong, to them... it never felt more right.
Applejack broke the hug to kiss Big Mac on his lips, the passion she felt was making her wild, and she needed a release. The kiss soon escalated as the two used their tongues, and Applejack began letting out small moans. She had never moaned before around others, but she didn't care. She had finally let herself be free around her brother. Her moans started to arouse Mac, he grabbed a hoof, and started caressing her beautiful, blonde, apple-scented mane. Applejack loved it, the feeling of his strong hooves against her soft mane. She wrapped hers around his muscular neck and pulled herself closer. She wanted her brother, more than anything in the world.
She broke the kiss, and grabbed Big Macs hoof, leading him to a haystack. She laid on her back, hooves up, and pleading for Big Mac to take her. Her eyes were filled with lust and her rapid breaths were filled with desperation. Big Mac stood over her, his member touching against her vaginal lips. He leaned over to kiss her forehead, before slowly inserting himself into his little sister. Applejack let out a sharp gasp as she felt the tip part her lips, and send a shiver down her spine. Big Mac also gasped unexpectedly, for he didn't expect Applejack to be as tight as she was. The pleasure was almost too much for them... almost.
Applejack held on to Big Mac tightly as he started to thrust ever so slightly. He wanted to make sure he didn't hurt Applejack, he loved her too much to ever let something like that happen. Which each thrust, came a tiny moan from her, her eyes closed tight as she passionately kissed her brother, and felt his hard shaft inside her. The euphoria was like something she never imagined. Each thrust bringing her closer and closer to her orgasm. Big Mac picked up his speed slightly, making it perfect for Applejack, who started moaning louder. Her eyes tightly shut, shuddering breaths escaped with sexual sounds, and they both enjoyed it.
Big Mac was letting out his own sounds, groans and grunts as his shaft slowly went in and out of his sister's tight marehood. He couldn't hold out much longer, the combination pleasure in each thrust, mixed with her seductive moans, and overall beauty was bringing him closer to his limit.
"Ugh," Big Mac grunted, "Apples, I'm gonna-"
"I'm almost there! P-Please, don't stop!" Applejack squealed.
Big Mac increased his pace even more, to try and make Applejack reach her orgasm before he did. The sudden pace change was unexpected, and indeed brought her to her edge. She bit her bottom lip and held in a loud moan as she achieved maximum euphoria. As she reached her orgasm, all that flowed through her mind was pure happiness, for the love she had for her brother burned a bright flame deep in her heart. Applejack smiled as she felt her liquid ooze down to her tail. Big Mac felt her liquid against his shaft and knew he had done his job. He couldn't hold back anymore, he unleashed himself inside her, letting out a mixture of groans and shudders. Applejack felt his liquid fill her, the sudden warmth dizzying her. He kept himself inside her for a while after he finished ejaculating his seed, the combined fluids dripping down onto his balls. The two of them panted and stared into each others' eyes, realizing what they had just done, and not caring at all. Applejack's leg quivered, as the two shared another long, deep kiss.
When the kiss broke, Big Mac pulled out. Applejack was still panting, smiling, twitching, and tired. Big Mac lifted her onto his back and carried her to her room. He tucked her in, her eyes already closed and still smiling. As he started to head out of her room, he heard her say, "I love you, big brother."
He looked back at her and smiled, "I love you too, sis."
The Next Day
The next day, Big Mac was deep asleep. Buried underneath his cluster of blankets, and snoring loudly. He would've continued to stay asleep, if it wasn't for the scent of freshly made pancakes laying next to his bed that invaded his nostrils. Big Mac then opened his eyes and woke up to breakfast in bed made by his sister, Applejack. Sure, it was a pleasant surprise, but it was unusual. Applejack only things like this when it was his birthday, but it wasn't. Applejack laid on the edge of the bed with a light smile, which concerned Big Mac.
"Apples? What's wrong?" Big Mac asked. Pulling the plate of pancakes close to him.
Applejack looked away shyly, "Um, Can we talk about last night?" She asked.
"Sure, what's up?" Asked Big Mac, putting aside the breakfast in bed and sitting eye to eye with Applejack.
"Um, well, some of the stuff that happened last night... I'm not sure it should've happened." She said. "Now I'm not saying I have any problem with what happened last night, but I just... I need to make sure that it wasn't a mistake."
"How would it be mistake?" Asked Big Mac confusedly. "I'm sorry but I can't understand."
"I just need to know... do you really feel the way the way you do about me?" Applejack asked, putting a hoof on his shoulder.
Big Mac got nervous at her question, he didn't know what to say because he didn't know the answer she wanted. A lot of stuff happened the night before that he didn't know if his response would negatively affect the relationship between the two. He didn't want it to. "Applejack," Big Mac said, "I... I don't know you want me to say."
"Just tell me the honest truth, please." Applejack said.
Big Mac looked down and sighed, "I do." He glanced up at Applejack, who he expected to cast him out for it. He thought the reason why she was here was because she didn't really mean what she said last night, when it was actually the complete opposite.
Applejack smiled. "I'm glad to hear it." She said. She approached Big Mac until she was eye to eye with him, and gave him and a deep mouth to mouth kiss. One which Big Mac did not all expect.
When the kiss ended, Big Mac was speechless. "Wait, so... you're not here to cast me out for it?" He asked. "I thought you were here because what you said last night was just to cheer me up, and you didn't really feel that way at all!"
"What? Of course not!" Applejack chuckled, "How I feel for you is true, I just wanted to see if you truly felt it too...." She started reaching down in between his legs, "...and I'm glad you do."
"Uh, what are ya doin?" Big Mac asked nervously.
"Oh come on, you've had your breakfast... let me have mine." Applejack said smirking seductively. She tossed her hat onto the floor, and started touching and grabbing on his testicles, making his erection start to come out. "Did anypony ever tell you that you're quite a big stallion?" Applejack asked as she staring at his erection.
"Uh No, but... thanks." Big Mac said awkwardly. Nopony had ever said that to him before, so for it to be his sister, he was a little speechless. He eventually stopped trying to make sense of what was happening, and just went along with it, laying his back against the wall, and letting Applejack do the rest.
Big Mac's erection fully grew. Applejack blushed as it touched her nose. She gave a quick glance to Big Mac, smiling as she started licking the underside of his shaft. She licked up and down his shaft, just as a tease to Big Mac. Her hooves ran along the side of shaft, stimulating more pleasure for him. She continued to do so for another minute, before Big Mac asked, "Apples, are you sure you want to do this? You don't have-"
"I want to." She said looking at him with passionate eyes. She looked back to his shaft, giving it a tiny kiss before wrapping her lips around it and starting to suck it.
Big Mac groaned as he could feel the warmth of her mouth touch his shaft. He felt her wet tongue circle his shaft, and her hooves continued to play with his balls. He shuddered in his breaths as he stared at his sister's beautiful blonde mane. Her head bobbed back and forth, having no choice but to deepthroat his long shaft. Big Mac felt his cock go deeper and deeper into his sister's throat, groaning in pleasure, but he couldn't fight the feeling that maybe she shouldn't be doing what she was doing. Maybe its was just his natural big brother instinct, where no matter what, he always cared for his little sister.
"Apples... Ugh." Big Mac tried to speak but couldn't because of the tremendous amounts of pleasure that he was receiving from Applejack. "Uh... look, are you s-sure you wanna be d-doin' this?" Big Mac stuttered, "I just d-don't want you to be doin' something you don't w-wanna do."
Applejack pulled her head back and looked up at Big Mac, a string of saliva connecting from her lip to his shaft. "Look, Big Mac," Applejack said, "I understand if you're a little unsure about me pleasuring ya, but last night, you gave me the night of my life. You turned something I had secretly dreamed about for years into a memory I'll never forget... now let me return the favor." She smiled as she leaned forward to kiss Big Mac again, then returned to sucking on his shaft.
She deepthroated his cock, pushing herself to swallow more and more with every head movement. Big Mac couldn't do anything except watch as she stared back at him with her bright green eyes. He stroked her mane, moving any stray hairs out of her beautiful face. He was having trouble keeping a straight face, as he started getting closer and closer to his edge. Every action Applejack did only sent more pleasure to Big Mac than the one before. She felt and massaged his balls and the very base of shaft, her tongue active all times, sometimes licking against the bottom side, or often circling the very sensitive rim of his cock. To be honest, she was partly doing it for him, but it was mostly for herself. The night before had left her hungry for more of her brother's rock hard cock, but she immediately fell asleep because of the incredible sex that she had never experienced before. She could tell Big Mac was starting to get close, his breaths were closer and faster, his groans started sounding less and less controlled. His cock throbbed inside her, tightly pressing against the inside of her throat. She started licking faster, her hooves squeezing the base of his cock. Big Mac couldn't hold it in anymore.
He tried to speak, let her know he was about to cum, but instead what came out of his mouth was her name and a large groan. "Apples! I'm... Ugh!" Out of sexual instinct, he shoved Applejack's head to the base of his shaft, completely taking her by surprise, as he unloaded his seed into her throat. Applejack just smiled happily as she closed her eyes and willingly took his seed, some escaping from the side of her mouth. She waited fifteen seconds for Big Mac to finish spraying his seed. When he finished, she still feel it slowing sliding down her throat like syrup, the salty remains on her taste buds. She pulled her head away from his now flaccid cock, and smirked at Big Mac, who blushed shyly back at her.
"Enjoy yourself?" Applejack said sarcastically, wiping the remaining semen from her lips.
"Hehe," Chuckled Big Mac, brushing his hoof against his mane. "My bad." He said.
"Its no problem." Responded Applejack, "I kinda enjoyed it when you did that, taking charge. It turned me on." She said whispering into his ear, then giving his cheek a tiny kiss. She ran her hoof down his leg then she got off his bed. "C'mon Big Mac!" She yelled heading towards the doorway. "Remember that no matter what, we still got apples to farm!" She winked at him, then headed out.
Big Mac chuckled as he lightly panted on his bed. He looked around his room and stared at his now cold pancakes. He got from his bed and let out a deep sigh. As he was going to wash up, he looked to see something on his floor. He picked it up and smiled. "Hey, Applejack! You forgot your hat!"
Author's Note
Sorry if its not the best, Its definitely been a while. I've proofread this story five times, and if there are still typos, please comment so I can fix them. (Also, Any constructive criticism is deeply appreciated) 
