Sibling Rivalry, Pt 1

Story by steampunkstallion on SoFurry

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#1 of sibling rivalry

Just a rough draft for the moment, looking for feedback and suggestions.


This is a draft, will be rewritten, looking for feedback.

Incest, horse, m/m, heat, alcohol, rimming, anal, domination/submission, masterbation

Robert sighed as he sat around his bedroom, looking at his computer and trying to find something decent to read. Lounging lazily in his boxers, the young fourteen year old colt reached down lightly to massage his sheath through the material. He gave a slight shiver, feeling the stirring underneath, his balls quite heavy from not getting off in the last week. Letting his eyes drift close, stroking slowly along his shaft through the material, his unflared head spilling free. Pushing his hips agaisnt his hand, sliding it under the fabric, he moaned very quietly squeezing himself. So absorbed in his toying with his sheath and emerging shaft he completely missed the door opening, his twin brother Adam coming in.

Looking back, the colt didn't really think about how things had ended up the way they did with him and his brother. Both of them had been fairly competitive in elementary school, and in middle school as well, and things changed a bit when they started high school. His brother had gotten picked on a bit, and he stood up for Adam. Slowly things had changed a bit, Robert had gotten a bit more sexually aggressive cause of the way he protected his brother, giving him quite a number of sexual partners. He was a bit of an eager male, taking both girls and boys for fun, but didn't submit to them and he saw his brother enjoy the protection, helping him out a few times with his urges.

"What the hell man!" as he glanced at his brother, the colt blushing slightly, his ears bright pink, nostrils flaring as he inhales the musk in the room. "You really want to get in trouble don't you?" Feeling quite embarassed as he could feel his own sheath stirring a bit in his tight briefs, unlike his brother who usually wore boxers.

Smirking slightly, Robert didn't bother to stop, shrugging at his brother. "Well I'm tired of not getting off.. I've got a horrible case of blue balls." Snorting slightly, he moans as his cock fully unsheaths, just under nine inches of thick equine flesh. Precum dribbled from the cumslit as he massaged his shaft lewdly in front of his brother, glancing over and noticing the bulge, laughing, "Oh.. getting hard watching your brother jerk off.. that's just a bit nasty" as he winks. "Come over.. give me a hand or get the fuck out, And I'll take care of it myself." Knowing alreadly what was going to happen, his brother was the opposite of himself. He flicked his tail high behind him in an aggressive posturing. His brother was more like a mare, than some of the mares he knew.

Looking back and forth nervously, "W.. what if we get caught?" the colt making his way over, slowly kneeling down in front of his brother, continually glancing back towards the open door. Adam was nervous, his parents were both downstairs, and they were supposed to waiting for their older sister to come home. Snuffling slightly at the other colt's balls, he gave them a tentative lick, ears folding back hearing that moan. Slightly wrapping his hand around his brother's thick flesh, Adam started to stroke him.

Shrugging, Robert's fingers, slickened with precum grabbed his brother's mane, "Mmmm shush..." letting his eyes close as he enjoys the feelings of his brother's hand and muzzle servicing him, scooting forward on the chair till he was almost falling out of it. Teasingly, he smeared his cock against his brother's muzzle, watching his reaction knowing he hated it, "Mmm like a greedy little mare.." Thick spurts of precum coating his shaft, he gasps softly at something his brother did, never did it before to him.

Adam snorted when that cock was rubbed against his muzzle, he decided to take advantage of his brother's distraction, trying something to be curious. His broad tongue flicked teasingly the slouched colt's tailhole, making him nicker, the taste of his sweat and precum and rump was a completely different taste than he had expected. He continued to lick, swirling his tongue teasingly around that tail star for a few minutes, making his brother squirm and whimper. Not knowing how long they were going to have, decided to help his brother get off and licked his way up his slick shaft, taking his head into his muzzle.

Feeling that tongue against his tailhole made the colt nearly fall out of his chair, he hadn't expected that sort of attention and his brother had always been against that sort of thing. Closing his eyes tightly, he wraps his hand around his cock stroking himself quickly, trying to resist the urge to jerk his hips, feeling his orgasm building. Groaning, he shuddered when he felt Adam's muzzle stop teasing him and engulf his cockhead. Lasting only a few more moments, he gripped his brother's head, pushing him down onto his cock, most of his shaft buried in the muzzle as he climaxed, his head flaring. Those heavy colt balls drawing tight against his body, spraying his thick cum down into the gulping maw. Snorting in pleasure, he could smell his scent thick in the air, covering up the aroused smell of his brother. "Mmm that's it slut.. swallow it.. every last drop." He enjoyed the sensation of dominating his brother far too often, and using him for his pleasure whenever he could. Finishing up, he gently pushed his brother away and smirked. "Poor little mare.. all worked up." pointing at the other colt's tented and stained underwear.

Giving a little groan, he swallowed the massive load as it flooded his throat, knowing it was either swallow his brother's load or choke on it, and it wouldn't be the first time it had happened. Eyes closed, he continued until he had swallowed it all, licking the shaft clean, feeling his brother scoot back. Ears folding back submissively as he lowers his tail covering his rump, realizing that his cock had been leaking this entire time into his underwear, and would have to change them before going back downstairs.

Both the brothers jerked their ears up when their parents called upstairs. "Get your rumps down here, your sister is home!" Robert and Adam both looked at each other in alarm, then glancing at the clock and realizing they had both wasted nearly forty five minutes on helping Robert get off. Smirking, Robert gave a bit of a laugh, "Awww.. poor mare can't get changed. Tough.." as he gave Adam's muzzle a bit of a smack, feeling the wetness of the pre and cum on his muzzle.

Adam blushed as his muzzle was smacked, he watched his brother Robert get on a clean set of dressing and then head downstairs. Sighing slightly, he adjusted his semi hard cock in his underwear and got dressed, groaning slightly at the tightness of his black jeans, knowing it was his best chance to hide any stains his cock may cause later. He headed downstairs a few minutes later, grateful for the fact he had just gotten a new bit of cologne, using it to cover up the smell of his fairly aroused state the best he could. Blushing brightly as he saw his sister, she had been gone for the last two years at college. The poor colt just couldn't help himself, he was starting to get interested in mares as well as colts in the last year, and his sister was what would be defined as hot. It showed that her gymnastics scholarship was still holding up quite nicely. She stood easily six foot, a good four or five inches taller than him and his brother, but where they were stocky, she was quite lithe in stature. He gave a little wave, trying not to stare at her ample d cup breasts.

The colts both oogled their sister a bit, only half listening to their parents when they said they were going out to a resturaunt to eat a dinner, celebrating their sister being home. Their parents ended going to a fairly fancy place that they went rarely, but with the table was setup, Adam ended up sitting next to his sister, the poor young colt squirmed in his seat the entire night, knowing that any second that his sister was going to point out that his was all musky and aroused in public. His tail flicked anxiously behind him while they ate. Robert shot him a few dirty looks during dinner, Adam was fairly sure it was cause he wanted to sit next to their sister, Erinn. By the end of the night, only their mother and Adam hasn't had indulged in the wine, he didn't find the taste to his palatte. After they had gotten home a little while later, he was instructed to help his sister to the guest room to get some sleep. Adam nodded dumbly, coaxing his sister to the room, and she slurred a bit teasing him, "I could smell your cock all night.." as the mare's hand cupped her brother's groin, Adam instinctively moaned. He excused himself as fast as he could, feeling quite nervous, the sound of Erinn's laughter ringing in his ears.

Robert perked his ears in the morning, a hand to his head as he sighed, realizing that he shouldn't have had so much wine last night at the resturaunt. Glancing over at his brother's bed, he smirked. "What's wrong there little mare?" teasing his brother. He could see Adam stroking himself through his underwear, deciding to laugh a bit, Robert rolled onto all fours, and flagged his tail grinning. "Come on.. take care of me some more.." Giving a little blush and nicker, wanting to feel good again.

Adam gave a snort and looked at his brother, eyes going wide watching him get on all fours, nickering slightly as he felt his cock lurch. Remembering last night when his sister groped his cock through his jeans, he slipped out of bed and slide his underwear down, his cock throbbing, being a little confused. Genital wise, he was bigger than his brother, thicker as well, something welling up in his body, moving forward as he smacked his brother's rump. "Oh.. want to feel good?" Feeling quite odd.

He gasped slightly, squirming as his rump was smacked, he slowly looked back a bit nervously. "W.. what? Of course.. Just kneel down and lick me. I want to get off." as he snorted lightly, his cock only semi hard, he hadn't seen Adam ever act this way before. He figured it might just be his hangover making it seemingly a bit difficult to focus, he flexed his rump slightly. A few moments later he rested his head on his pillow, closing his eyes "Oh yah.." He was getting his rump licked again, ignoring the heavy musk of his brother, or the way his ass was being kneaded, the same way he had done to girls at school.

Adam snorted slightly, but after a few moments gave into his brother's request, eyes glancing at that flexing rump as he grabbed it with his hands, kneading it slowly, his cock starting to ache. The colt was slightly confused, he had never felt this way, even when he watched some of the gay boys at school submit to the males, his tongue flicked against his brother's tailhole, getting it slick with slobber. He teasingly started to press his finger into his brother as he licked, giving a little snort at the soft moans escaping his brother's muzzle. Using his free hand, he slid his underwear fully off, climbing onto the bed, he leaned over his brother and whispered, "here.. let me tease you some more.." as his drooling cockhead nudged his brother's tailhole, he felt the colt try and move under him, leaning in and nipping him hard, his brother stopping his fighting.

Squirming, he enjoyed the attention to his tailhole, moaning out at the feeling. It felt so good having his tailhole licked like that, he had a girl do it once and tried to find someone to do it for him again after that but hadn't had much luck. He couldn't believe his luck with his brother doing it last night, and now again this morning before everyone got up. Giving a little whinny as he felt that finger against his tailhole, he tried to relax, having toyed with himself a little like that, feeling it sliding in and out, moaning a bit more, flagging his tail more before flicking it to the side, getting annoyed with it smacking against his brother. His eyes snapped open when he felt that weight on his back and his brother's cockhead rubbing against his tailhole, he tried to lift himself up but whined as his neck was bitten roughly, what was going on, Adam had never acted this way before! He tried to squirm slightly, not really fighting but trying to make it so he couldn't get mounted like some mare, cause he knew he'd never be able to live it down after all the times he'd dominated his brother. It wasn't like he could cry out for help, he didn't want his parents to catch him like this, underneath his own brother bout to be mounted like a mare. Robert gave a little moan from time to time, feeling that leaking cockhead slowly spreading his virgin tailhole open, relaxing after a bit as he let himself be mounted, his half hard cock barely able to slap against his belly. For all the times he had been the alpha stallion, he felt so confused why it felt nice to be the mare for once and possibly more than once.

Adam's hands slowly slid to his brother's hips, he snorted and nipped his neck again elicting a moan and nicker from his brother, his cock jerking slightly. A single thought kept racing through his head, "claim this mare. put her in her place" He felt a thrill race up his spine, a bit of fear in him as well, not having felt these sort of urges before. Those fears faded to a barest of whispers, when his brother relaxed and let him into him. He gave a deep moan, gently pressing his thick unflared flesh into his brother, his tail jerked high behind him. "I'm not your mare.. not now and never again." as he slowly pressed until his shaft rested fully in his twin brother, something causing him to grind himself when he got an acknowledgement. Closing his eyes, he drew back until the medial ring of his shaft popped out, eliciting a gasp from both of them, he then thrust into his new mare. He continued those slow delicious thrusts, getting used to the feeling of being in charge, claiming something that belonged to a stallion. He heavy balls swaying slowly, bouncing wetly against his twin brother's balls, enjoying the sound of his ample balls swinging, he snorts lightly, "Going to cum and claim you.." as he gives a bit of a snort.

Robert couldn't believe what was going on, here he was being fucked like some little mare, he whinnied in pleasure each time his brother's thick shaft sunk fully into him. Closing his eyes, he didn't want to admit how good it felt, know he knew what it was like with the girl's he was with, and didn't want this pleasure to end. Folding his ears back submissively when he listened to Adam's words, he groans a bit, wanting to feel it more than anything, he whispers "p.. please.. it feels so good.." starting to push back against the stallion on his back, a hand sliding back to cup the heavy balls. Eyes snapping open when he felt his brother slam himself forward roughly, grinding against his rump as he shuddered, those heavy balls drawing away from his hand. He wasn't sure what was happening, until he felt that muzzle clamp down on his neck, biting him as that shaft swelled inside him, head flaring as he groaned, it sinking in fully what he had just done. The normally dominant colt had completely given in to his brother's mounting him, moaning softly in pleasure as that thick heat flooded his rump, the smell of his brother's cum filling his nose. Shivering slightly at the odd sensation, his own climax hitting him, shooting his seed against his bed slumping down slightly. Sighing softly as he felt his brother withdraw and give his rump a slap, causing him to blush furiously. He turned and glanced his brother slipping out of the room, his cock coated with cum.

Giving a lick of his muzzle, he stroked a hand along his chest, he felt so filled with a new found confidence. He didn't bother to change into anything, heading to the shower across the hall from his bedroom, his cock hanging freely from his sheath, glistening with cum. He perked his ears and listened to see if his parents were up, and hearing snoring coming from their room, he made his way fully to the bathroom, pushing the door open. Stiffening as he paused, a rather interesting view greeting him. His sister was sitting on the toilet, the look of suprise in her eyes palpable as she looked at him, then glanced at his cock. "Well sis.. going to finish or sit here still? Gotta piss." as he snorts, feeling in charge and confident now. His nostrils flared as he heard the sound of piss hitting water, giving a slight groan "damn.. never thought piss could smell so good.." The colt licking his muzzle as his sister pushed her way past him, groaning "dirty little boy" as she laughed, he glanced at her rump before turning to grip his shaft, relaxing and emptying his bladder into the toilet. Leaving a hand on the wall as he finished emptying his bladder into the toilet, he stepped back and grabbed a washcloth and wiped his shaft clean.

Pausing as he went to leave the bathroom, he noticed his sister's pair of pink silk panties. He noticed the dampness along the groin area, lifting it to his muzzle, he snorted getting a nose full of her scent, it was a mixture of her juices and her piss. He grunts as his sheath stirs slightly. Licking his lips, he heads back to his bedroom glancing at his brother was was dressed and was getting ready to go downstairs. Smirking, "Why not be a good boy.. make everyone breakfast." as he kept the panties hidden from his brother's view. His sheath still somewhat thick looking. Something just felt nice about being able to boss his brother around and how he listened. As his brother went to step past him, he leaned in and whispered softly, "Oh don't worry.. Everything outside this room will be the same and won't change, but in the room, you'll obey me." as he grunts. Watching as his brother nod, he smiled and settled down on his bed, stuffing the pair of panties under his pillow for later.

The next few days were fairly boring for the colts and the mare, they did normal family things. There were a few outings that they went on, Robert couldn't help but notice that his sister was acting fairly odd whenever she was around Adam, but shrugged it off. He had gotten used to his place, servicing his brother each night once everyone was a sleep, and rather looked forward to it as he didn't mind being fucked. He still acted like the big tough guy outside the bedroom, and at school, but other than that, he was the nice faithful mare to his twin when they got alone.

Many things had changed for the young colt since something had been awakened inside him, and didn't even realize what it was.