Siblings are like glue; they always stick together.
The alarm clock from the nightstand started singing its loud, annoying melody. A light purple hand reached for it and stopped it.
Sunny Sorbet sighed and slowly opened her eyes. The young mare drunkenly got out of her bed and headed towards her bathroom. After finishing, she got out on the sound of the toilet flushing and started heading towards her door fixed mirror. She stopped in front of it and took in her appearance.
Soft, delicate light purple fur that reminded her of freshly picked wisteria; pale pink, curly hair streaked with golden highlights that looked like sun rising, probably one of the reasons for her name. Her dark brown eyes were the only thing contrasting beautifully with her overall pastel coloration. Sunny admired herself in the mirror: she was a beautiful young lady. She knew that and everyone knew it too. But like any other mare her age, she had her insecurities. And her biggest one was, ironically, her appearance. But not in the "beauty" kind of way. Sunny hated the fact that despite being twenty three, she still looked like a child. Despite her taller, curvaceous friends, no curves or femininity could be seen on her body. A lot of times Sunny found herself fuming when other ponies assumed that she was the kid sister of one of her friends.
"I know every mare wants to be complimented that she looks young, but this is ridiculous!", lamented the mare. She knew that mares benefited from looking young, but she was just treated like a child. Stallions rarely flirted with her, and those that flirted with her turned out to be...dubious, at best.
"Fucking foal fiddlers! How come every stallion I want to date either treats me like a child or wants to date me for this exact reason?", asked the mare through clenched teeth.
The mare sighed and ran her hand through her hair. "Whatevs. I need to get ready to meet with the girls", and with that, Sunny walked towards her dresser. Despite her looking much younger than her age, Sunny had her own personal fashion sense and aesthetics, and she didn't want to give up on them just for the sake of attracting a stallion. She refused to dress in order to look older. So she picked up her favorite floral milkmaid dress and rose headband, put them on and then sat down at her makeup vanity and started applying her eye makeup in a way that accentuated her beautiful brown eyes, then applied a delicate peach blush that contrasted gently with her light purple coat and finished her makeup with her favorite pastel pink lip gloss. After she finished, she smiled at herself and nodded. She looked cute. Very mindful, very demure.
Sunny picked her floral handbag that she got as a present from best friend, then headed towards the exit. As she passed the guest's bathroom, she couldn't help but notice a soft whistle. She furrowed her eyebrows for a bit, then lowered them in annoyance as she remembered who produced that sound.
"Ugh, right. Onyx Haze is home this week. How nice", she said sarcastically as she passed the bathroom. Truth be told, she didn't really have a bad relationship with her step brother. In fact, and she kinda hated admitting it, he was a pretty decent dude. Handsome, tall, athletic and a bit nerdy, he was both polite at times but also a bit teasing. At first, Sunny respected him deeply for not mocking her for her childlike appearance, especially since she was older than him, but that respect changed a bit into disgust when she realized, totally by mistake, that he had a rather...peculiar, to say the least, taste in mares.
She recalled the day, a few months ago, when she barged into his room, asking for something. He was in the bathroom, and while she skimmed his room, she noticed his computer was on. She narrowed her eyes when she noticed it was actually opened on a porn site. Sunny rolled her eyes. She knew her brother watched porn, it wasn't a surprise for anyone. However, her brows lifted a bit in surprise when she realized what kind of porn he watched. All titles contained words like "petite", "young", "barely legal" and "lolita". It was a bit strange, but she didn't think much about it at that moment. So she simply decided to exit his room. "He probably has no idea where my earring is anyway", she concluded.
But that incident appeared again in her mind when two weeks after she visited his room, her best friend appeared at her door with her little sister. Her step brother was in the kitchen and Sunny was just coming down the stairs from her room, so she didn't have time to open the front door. She noticed that her step bro did that and after that he just froze. Sunny greeted her best friend and her little sister as she stopped near Onyx. She side eyed him as he had his gaze fixed on her best friend's sis. It was odd. She never saw her step brother eye any mare like this. It was like he was enraptured by the filly.
She was just imagining things, right? Even if she tried her best to deny it, deep down she knew that sometimes, her step brother eyed her suspiciously too. It didn't help that their relationship was always a bit awkward, since they became step siblings in their teenage years. Sure, they actually did a lot of activities together: they played video games, they gossiped, they played sports together, but all the time it felt like there was...something off between them. Sunny always tried to justify her step brother's behavior. Not because she was naïve, but because she thought that it will make things less awkward for them. It wasn't sexual tension, they were just embarrassed around each other. He wasn't a perv, he was just hormonal. He didn't look at her lustfully, he was just surprised by her appearance, that was all. But deep down, she knew the truth. And no amount of studying, hard work or politeness would hide it. Not for a long time.
Later that day, Sunny came home and slammed the door behind her, taking her headband off and slamming it too on the table. She didn't know exactly why she did that, all she knew was that she was mad again. Grumbling, she briskly walked towards her room. Of course, stallions were driven towards her circle of friends again. Of course, they all ignored her. Again. She was so tired of this ignominy, even though it was always the same. Why was she even surprised at this point? She sighed in resignation and decided the best course of action now was to take a hot, steamy bubble bath to calm her mind, body and soul.
As she thought about transforming her bath into a pastel colored, delightfully smelling potion cauldron, her train of thought was interrupted by the sudden greetings someone offered her:
"Heya sis, watcha doin'?, said politely, but with a hint of mischief, her step brother Onyx Haze.
Sunny didn't even realize that she entered the living room and was now posted near the couch, which was currently occupied by her step brother, who was lazily scrolling on his phone.
She grumbled internally and thought about what was she going to do: should she be curt with him? Should she tell him how she felt? Should she simply ignore him? All of these options made sense, since she was tired and frustrated. But right then, something else was plotting in her brain. Because of her appearance, Sunny was always underestimated, but in reality, she was a very smart, analytical and logical girl. But right then and there, even she couldn't explain what she was about to do and why. She just snapped. It was probably all her pent up anger, sadness and frustration that came crashing down and materialized itself as this one action.
Suddenly, Sunny smirked at her step brother and then turned away. Even he was surprised at her gesture, and he sat up straight on the couch while looking at Sunny with a quirked eyebrow.
Without a hint of hesitation, the pastel mare bend over like a cat, supporting her weight on her arms while her ass was high in the air. She started waggling her hips at Onyx, and in turn her floral dress hiked up above her ass, and he could see her plain white panties. The stallion stopped moving, stopped breathing as he perplexedly drank in the view presented before him. He was always attracted to small mares, and it didn't help at all that his step sister fit that criteria. She was an adult mare, even older than him, but she almost looked like a preteen. A gorgeous preteen. He knew she was mad that almost everyone treated her like a child, and even he was guilty sometimes of teasing her about her features. But the reason why he did that was simple: not really because he was polite, because he was respectful or because she was older. It was so he could hide that he lusted over her almost daily. He'd ravage this mare if he had the chance. He'd enjoy her childlike body while fucking her like the adult she was. And it seemed that today he had the chance. His cock throbbed painfully in anticipation.
"Supp, perv. Like what you see?", asked boldly Sunny. She never stopped wriggling her hips at him. But in reality, the mare had no intention of doing it with this perv. All she wanted to do was tease this stallion and to get the confirmation that he was either attracted to her, or to fillies. Or mares that looked like fillies.
She wanted to add something, but heard Onyx getting up from the couch and hurriedly approaching her. She wondered what he was about to do. Was he going to ask her what is she doing? Why is she doing this? Or would he be bold enough to just playfully slap her ass and laugh-
She stopped thinking though as the stallion plunged his entire cock in her pussy, not even bothering to move her panties aside. She let out a shrill scream as she started to convulse.
"If this is what you wanted, you could've just ask, slut!", replied her brother as he reached for her arms and brought them to her sides.
Sunny gasped as she was lifted upwards by her arms and noticed that her legs stopped touching the floor. The only thing that kept her up was her step brother's cock. It was surreal.
The tall stallion used his strong arms to support the petite mare, and then started fucking Sunny like a beast. The mare moaned and thrashed as saliva poured down on the floor through her clenched teeth. It was amazing. His giant cock felt amazing in her needy pussy. She opened her mouth and screamed in pure ecstasy as she came, drenching both their thighs in her thick nectar.
"Heh, you already came? Fucking whore, I knew you'd love my cock", said smugly Onyx as he started fucking his sister faster. Her pussy felt amazing: it was extremely wet and hot, but also tight. He loved it.
As he continued using his step sis like a living fleshlight, Onyx lifted his head and noticed that they were facing the dresser's mirror. He suddenly grabbed Sunny's dress and ripped it off, leaving her with only her ripped panties on. He put her arms behind her back and grabbed them both with his left arm, while he used his right hand to grab a fist of her beautiful, curly hair and lifted her head towards the mirror. The stallion smirked and whispered gently in her ear:
"Look, look at your petite, beautiful and slutty body. It is mine now. I know your frustrations. I know stallions don't want to date you. But don't worry, I am here for you. Your desperate, needy pussy will be fed daily by my cock. In fact, I will fill all of your tiny holes with my cum. I will fuck you so hard and so good that you'll beg me to come home sooner".
The mare shuddered at his words and at the image in the mirror: her impaled on his cock, with no possibility of escape, a strong hand firmly grasping her hair, her tall, handsome step brother glued behind her like a shadow, and most importantly, his big cock visible through her flat tummy. She stared in awe as he gently fucked her, as if letting her process all he said, but the small, analytical and logical voice in her head screamed for her to stop, to end this debauchery. This was her brother after all. She loved him. As a brother, she meant! It was not right. But the instinctive, more primal Sunny in her head was louder and it won, so she gave it voice:
"Fuck me"
Onyx grunted and started fucking her like a savage animal. There was no gentleness, no love. Just raw, passionate breeding. Sunny came again as her toes curled inwards, but she still wanted more. It almost felt like she was in heat. Or maybe she was, who knows? At least that way she could justify her behavior and her body's response to this intense coupling.
"Fuck, I'm so close, I'm gonna -", but he was unable to finish his sentence, as he groaned loudly and deposited shot after shot of hot, thick and potent cum straight in her womb. Sunny watched with wide eyes as her belly got bigger, almost like she was pregnant.
The mare yelped as her brother unceremoniously dropped her to the floor, where she fell on all fours. She looked down between her arms and legs and saw her brother's cum pouring out of her abused pussy, forming a pool on the carpet. They'd need to clean that fast.
She got up slowly and looked towards her brother, who was silently sitting on the couch, as if he could not believe what happened. Truth be told, she was somewhat in the same boat.
He looked at her, but avoided her eyes. "Sunny, I-". That's all he could muster before he turned his head away, thinking about what he was supposed to say. What was he really supposed to say? Sorry that he fucked his extremely gorgeous step sister that was exactly his type and who was also the object of his fantasies? And how could he say that? He wasn't even sorry.
Sunny for her part, just looked at him silently, pondering. What happened was strange and unconventional. But at the same time, not really something that wasn't unheard of. In fact, she had a lot of friends that fantasized about their step brothers. Even she sometimes fantasized about him. It shouldn't be an excuse, but still. And even if she didn't want to admit it out loud, it was hot. Not to mention that her brother was to die for. But first, she just wanted to be sure of something.
"Hey Onyx, do you love me?", she asked somberly.
The stallion was taken aback by her question. His eyes widened as he stared at her. "H-huh? What do you mean?".
"Do you at least like me...?", she tried again.
"Wha...?"
"As a sibling, I mean".
Ok, this was getting uncomfortable, but Onyx knew he owned her an answer. And he was about to give her an honest answer.
"Sunny, I won't lie to you. Our relationship as siblings always seemed awkward and, heck, I bet that after tonight it'll be even more awkward. And the reason as to why it's awkward is because, well, I was always attracted to you. So, to answer your question: no, I don't love you as a sibling", the stallion didn't explain, but he hoped she understood the implication. And as his step sister's eyes widened, he smiled.
"You mean..."
"Y-yes"
Sunny paused as she processed his words. So basically her brother admitted that he loved her as a girlfriend. But would he actually want a relationship with her? Was he all bark and no bite?
"Hmm, to be fair, I didn't pursue anything with you because you're my step brother. But yeah, I feel the same way". She smiled as his eyes lit up. "Glad we talked, just thought and hoped that we'd do that first before...you know", she added humorously, just to assure her brother that she wasn't mad. "So, what happens now?"
Onyx could only stare dumbly, with his mouth agape at his beautiful and amazing step sister, who just now became his girlfriend. He grinned widely at her, not quite yet believing that she not only wasn't mad at what happened today, but she also liked him and started a relationship with him. What was once his fantasy was now a reality. So, emboldened by her responses and question, he asked without any hint of hesitation:
"How do you feel about cosplay and butt stuff?"
Author's Note
This is just a silly fic I created a few days ago, I know it's not great. I am actually a bit uncomfortable with incest, even if it's "step siblings", so this was more like a challenge for me to write and this is also the reason why I used OCs and not "canon" ponies i.e. Twilight x Shining or Applejack x Big Mac. And aside from that, another theme I am a bit uncomfortable is clop involving fillies and "mares that look like fillies". So two for one combo yay.
I have nothing against incest, in fact I like reading incest stories, it's just that it's a bit icky for me to write incest clop. I hope I don't come off as a bit hypocritical 
