Chapter Text
Looking back, Thor knows it all started during the journey marking them as fully-fledged adults, ones fit to rule.
It hadn’t been obvious at the time, of course not, he’s only just realized it right now, for Gods’ sakes. It had been a month’s long travel from their native kingdom out all the way to the frigid ocean to the very north of the continent, passing through winter forests and up and down multiple mountains with no other way to go. It was a perilous journey, physically, mentally, emotionally trying even for Thor, one who’d gone on such expeditions before, just shorter.
But for Loki, it was a different story entirely.
He was made not for brawn but for brains, his hands calling magic just as soon as his mouth could form words. So when their father swore off any sort of witchcraft for the entirety of the trip, claiming it was to grow them into fine, strong young men, the two merely looked to one another. There was no way that was going to happen.
And, for the most part, there wasn’t. Loki would cast spells whenever Odin wasn’t looking, glancing to Thor with a sly grin before going back to staring at the sky, hands clasping to snap out the magic, going right back to it the moment their father looked away again. Thor knew he should tell, knew the spells of fortification and strength were cheating, things that would keep Loki from growing real muscles, real resilience.
But he just couldn’t bring himself to snitch on him. Those cunning eyes sparkling with familiar mischief, the slight twitch of a sneer, all wrapped up in a dark, alluring secret. It made Thor feel even closer to his little brother, tied in a lie that would make their father enraged if he found it out, enough perhaps to haul them all the way back home and call the whole journey off for at least a year.
It was chilling, made it hard for him to sleep at night, and he wasn’t entirely sure why. It was just magic, it was only a year, at most.
But now he knows why.
It wasn’t the secret itself. It wasn’t even Loki’s hidden expressions, to him and only him.
It was the feeling underneath those eyes. Something dark and powerful, lurking just under the surface. He might call it evil if he were in a place to speak, but he isn’t, at least, not anymore.
It was exciting, like Loki was challenging him with every glare, every well-timed grin, every slight tilt of his head. Not just challenging him, perhaps daring him. Inviting him. Pleading him.
Begging him.
And those tiny expressions only got more common, the subtle meaning behind them more intense, still not enough Thor caught on, though, as the month wore on. Loki would grow tired to the point his spells could no longer aid him, having to lean on Thor’s solid chest until their father checked behind himself and toss himself onto exhausted feet; had been scratched by thorns and branches to the point of permanent scars forming; had fallen from cliff faces and bruised himself badly too many times to count. All of it should have made him stronger, tougher, as Odin had intended.
Instead, it made him even more rebellious than he had been already, every hit, each cut, making him more driven, yes, but in the entirely wrong direction. Odin didn’t notice, too proud to see it, too unattached from Loki’s emotions, but Thor did, of course.
Slowly, ever so slowly, over the course of the journey to the frozen sea and back, Loki grew from an innocent, albeit somewhat tricky teenager of before, to what Thor knows now is a monster. Driven solely by selfish greed, reckless desire.
But Thor himself isn’t blameless. In fact, he’s much to blame.
It was the night that they returned back to the castle that it all boiled over. Loki waited until after all the servants and their mother had greeted them, praised them for a relatively safe return, waited entire hours until well past midnight when they were finally allowed to get some rest, then waited some more until the moment Thor had just begun to doze off.
Then he began to sob, wracking wails just loud enough to penetrate the thin wall between their mirrored rooms, waking Thor immediately from his thin slumber. Thor rose and rushed to Loki’s room, of course he had, for what else should an older brother do but to help the younger, however possible?
It had been a tough journey, after all. They had nearly died more than a handful of times, each of them, so a good heart-to-heart was long overdue, he thought. He held Loki’s still-slender form in his large arms, thinking nothing much of it at all then.
Loki kept on crying—perhaps some of those tears were real after all, but who even knows anymore—but let his hands roam from around Thor’s nape to against his broad back, over his shoulder blades; pressed his face into Thor’s neck and breathed just the slightest bit too deeply. Thor had just blamed it on the wracking sobs then.
Loki wiped his tears, thanked Thor, told him he could return to his room. And Thor did, but only after a few kind words were exchanged with his little brother. He’d felt better of himself then. Loki had smiled beautifully. But there was that awful glint, that challenge again. That horrible want.
And despite his bone-tiredness, it was hard to sleep again that night.
But the real torture was yet to begin. Loki was slow, methodical, but he now knew what he wanted. And he wanted Thor, his own brother. They weren’t bound by blood, he knew, and so that solved the only potential problem Loki would have had otherwise. He didn’t care they were both men, didn’t care they had had the same parents for half a decade, didn’t care if their bond struck closer than most should, he didn’t care at all. He just knew he wanted Thor, and he knew he would get what he wanted.
Come next morning was when Loki really began. He switched his pants for skirts, something their mother allowed but father loathed, so Thor passed it off simply as spite against the man. But Loki would pay special attention to Thor, ghost after him from room to room, lay himself out in chairs so his long legs would fall out of the frilly thing, the smooth paleness of his flesh unmistakable against the drabness of their surroundings.
Over the coming days he got more and more confident, would sit closer to Thor, lean up to him and push out his chest to make Thor glance down his loose shirt, take in miles of milky skin, fixate for a second on his small, hard nipples before catching himself, nearly falling out of his chair and wanting to slap Loki for making him do something so embarrassing right in front of dozens of servants.
Loki would just tilt his head coyly, pretend that nothing had happened at all. He was so good at it that it made Thor doubt himself, what had literally just happened.
Because perhaps his brother hadn’t meant to thrust his tits right into his face.
Loki was ingenious, rarely using a trick twice, at least not so frequently Thor would catch on too quickly. So he would instead put on stockings, white or black depending on the mood, flaunt his long, thin legs right in front of Thor no matter the occasion, no matter how many people might be watching. He would push out his hips, had learned an exaggerated catwalk that swivelled his skirt from side to side, high heels from Gods-know-where getting taller and taller by the evening until he grew entire inches, posture even more ridiculous than before with the struts pushing his legs up, his round ass forward.
Thor had morals, however. He wouldn’t dare give in to his brother who he was now almost entirely sure was trying to flirt with him, lead him on, perhaps as a twisted joke, but then again, perhaps not.
Thor thought it vile, reprehensible, yet… at the same time, he couldn’t help but stare. It was natural. Loki was a beauty through and through, long pitch hair, a face sculpted as though by the Gods themselves, his body similarly perfect, thin and soft, girlish curves in all the right places. Thor had managed to stave off his horrid thoughts before, but now, with the way Loki was obviously teasing him, it was impossible not to let some impure things slip into his mind.
Especially one night entire weeks after their return. Loki seemed to have grown frustrated with Thor, having had a good argument complete with throwing of sharp weapons a breath from his face. He’d already forgotten the details by the time he turned in for bed, Loki having stomped up to his own room in tall boots to slam his door shut an hour before.
And then Thor heard it.
Coming from Loki’s room just down their isolated wing, loud sounds, moans. Of pleasure or pain he couldn’t tell, so he ordered his body to move forward. He knew they were sexual halfway down the hall, but found he couldn’t stop himself. Loki’s shrill voice was like a siren’s call, beckoning him to his demise as it turned to screams of hedonism that drowned out Thor’s softened footfalls.
He saw the door was cracked open the same moment his ear picked up the noises of wet squelching, liquid being fucked by fingers covered in cum that he could now see, peeking a wide eye through the doorway.
Loki was completely naked on his massive bed, covers dishevelled about him and his flushed body, legs spread almost perfectly so Thor had a wonderful view of his little brother thrusting three long fingers into his cunt, moaning and clenching around them, canting his hips. His small, slender cock dribbled above him but he didn’t touch it, the other hand instead busy twisting a pink nipple, body writhing in mind-numbing pleasure so he didn’t even notice Thor staring at him, didn’t even think to look.
Thor would like to say he left right then, but he knows he didn’t. He stayed there, frozen, watching Loki play with himself until his little brother was shrieking, incomprehensible words mixing with curses and meaningless sounds, but one word became clear on his glossy lips, plain as day when he came in streams over his hand buried up his cunt, making Thor's hammering heart stop in his chest.
“Thor!”
Laying in a puddle of cum both of his cock and pussy, panting heavily, Thor left only when he saw his little brother’s eyes begin to flutter blearily open back to reality, a coward afraid of being caught in the act.
He didn’t hear Loki’s giggling to himself then, was too busy fucking desperately into his rough hand at the image of his own damned brother.
He came in mere seconds, stared at the white streaks of seed and thought himself inhuman.
Not a wink of sleep. Both from restlessness and rubbing his cock raw.
After that, Loki became further emboldened. He started “accidentally” dropping things on the ground, tutting to himself before he leant over to grab at it, missing a couple times just so he could make his big brother stare at his lacy panties the slightest bit longer, see how ready he was, how wet through the cotton creamy with cum was his dripping cunt.
He would touch Thor, press against him in halls crowded with servants passing for dinner rush, slide his hard nipples against his broad chest, lock sultry eyes made dark with makeup with him as he felt through fabric for Thor’s cock still obviously massive even when soft.
He would sit on Thor’s lap when there was no room for seats instead of standing as any normal human would, uncaring of the stares and just fixing his skirt over their combined laps, pretending to look to the ceiling dully while he covered his leaking erection as well as Thor’s, his brother's giant cock pressing right between his naked pussy lips soaking wetness through his pants.
At dinner, he would hold lively conversation with their parents, laugh and comment just as the rest of them, all the while reaching under the silken tablecloth to grab at his brother’s hard cock through the wool of his attire, run his fingers up and down his impressive length and pretend his drooling was from the lamb. He’d smile, lift the cloth so Thor could spy him spreading his thighs, diving the other hand under and into near-darkness to fuck two thin fingers into his wet pussy, then asking their father across from them a question about war like there was nothing going on.
Absolutely disgusting. Loki was a slut in any sense of the word, a rotten harlot deserving the worst torture the Gods had for such a sinful creature.
But so did Thor then, because one drag of his large finger on his throbbing cock was all he would need to cum in his pants right then and there. Loki would grin, wouldn’t even have to look for the telltale huff Thor made, beginning to recognize it, that’s how often it happened. He'd pop his cunt-wet fingers into his mouth like they were coated in the juices of food—they were, in a way—humming in delight and staring right at his brother, making him almost jealous.
And, the entire time, their dim family was absolutely none the wiser of the incest going on right before them. Perhaps some more observant servants had caught on—they were getting rather obvious—but it never mattered, no one ever listened past rumours of the royal brothers potentially having a romp together.
They kept it up, of course never talking directly about what was going on but instead doing so with passing looks in the rooms and halls. Challenges and promises. What they would do that morning, in the afternoon, come evening, tonight. Flirt with their connected eyes, tease with Loki’s pussy, grind on Thor’s cock, and then go to masturbate in their separate rooms at the end of the night, drinking in each other's sounds through the frail wall between their headboards. But Thor would never actively participate, never lay a hand on Loki’s delicious body, content to just watch, to listen, to stroke himself until he came perhaps the third or fourth time that day.
Thor let him convince himself it was what was keeping him from being a monster, from being just like Loki.
But Thor did want. He wanted more.
He wanted Loki.
His own damned brother.
And it made him absolutely furious. It was all Loki’s damn fault, getting him to this point of pure fucking insanity. It drove him wild, made him want to gut the beautiful creature that had captured his mind as much as he wanted to fuck him into the ground.
Something had to change. This needed to end, one way or another.
***
So now—fresh from an afternoon nap from jacking off after Loki had grinded his cunt on him in the dining hall again— when he discovers his whore of a brother out in the sun room, light streaming onto half-naked skin, skirts rucked about his thin waist and ass high in the air, cock and cunt both plainly displayed toward the one door to the room, a pale hand fucking lazily into his pussy, Thor finally fucking has it.
“What the fuck are you doing?” he spits, literally, spurts of saliva leaping from his mouth right onto Loki’s bare shoulder. The slut fucking moans.
Loki giggles, looks over the shoulder still half-draped in a mockery of a light dress sleeve as he slurs, “Having fun, dear brother.”
Thor stomps up to him the short distance of the warm summer room, heavy footfalls shaking the fat of Loki’s ass and thighs above his black lacy stockings, “What if a fucking servant saw you, huh?” He grabs hold of one of Loki’s hip bones, hard enough to bruise and make him whine, a noise of pain that satisfies something dark inside him, “What if our fucking parents saw you?”
Loki laughs. “They’re not my parents. They’re yours.”
He was trying to make him mad, Thor knows. But he can’t help but feel rage, hot and blinding red, fill his entire body anyway. He seethes through grinding teeth, “They picked you up from the kindness of their hearts-”
“They picked me up because you liked me, Thor. No other reason. If you hadn’t, they would’ve left me to starve with all the other orphans of the fallen kingdom,” Loki chuckles, pressing his fingers knuckle-deep back into his pussy with a disgustingly wet noise, clear cum dripping down his wrist. “Maybe they didn’t expect you to like me quite this much, but I’m sure they’ll get over it eventually. They'll be overjoyed to have many grandchildren. That’s how many marriages are arranged anyway, you know. From childhood.”
“You’re disgusting.”
“You’re hard.” Loki doesn’t even have to look to know he’s right, smiling in self-satisfaction at the silence that follows.
“It’s perfectly natural, Thor, to like something that’s pretty,” he mutters, wiggling his hips. “And there’s no actual blood between us, we met when we were young teens for fuck's sake, so there’s nothing in our genes stopping us from desiring each other.”
Thor presses his nails into Loki’s flesh, hard enough to leave deep impressions in his skin. He knows he shouldn’t. If he fucks Loki, he'll impregnate him even if he were to pull out midway through—Loki’s special female anatomy made extremely fertile by magic bestowed upon him by his birth mother—and there was no way they would hide the obvious pregnancy that would surely follow on his lithe frame.
“Fuck me, Thor,” Loki breathes anyway, looking back and spreading his cunt hole with his fingers, slick cum leaking from his pussy in waves down his hand, an impossible amount again given by his magical lineage, same as his extraordinarily high sex-drive. And what was Thor's excuse? He was just a normal man, no sorcery to excuse his sins.
“I can’t,” Thor says. “You’ll catch.”
“Mmm,” Loki moans, running his thumb down his flushed shaft, “yes, yes I will. Oh, make me catch, brother, fill me with your cum until I’m dripping with it for days.”
“Loki!” Thor snaps, slapping a hand down on his ass to try to ground him, only making him whine another moan. Fuck. “Think! What will happen if I breed you?”
“I’ll be pregnant with your heir, I’ll give you a strong first son to rule the kingdom for decades, and that will only be the very beginning…” Loki says dreamily.
“No! Everyone will know, Loki! About us, about my having sex with you, it will be undeniable!”
Loki giggles, drunk on pleasure as he glances to Thor’s twitching cock through his pants, licking his lips. “Good. I want them to know.”
“But what will they think–”
“I don’t care!” Loki interrupts, brow furrowed with passion. “If they don’t like it, they will learn to, if they still will not, we’ll have them hang! Simple as that!” He juts his cunt out toward his brother warm and heavy behind him, yelling, “Now fuck me already, Thor! Fuck me like you’ve been dreaming of for fucking months!”
Thor pulls his manhood from his pants impossibly quick, pressing his giant, thick cockhead right to Loki’s cunt all in under a second.
“Alright,” he grunts, “you fucking whore. You want it? You'll fucking get it.”
Loki’s eyes go wide, jaw dropping. Holy shit, just like that? Loki was better than even he himself thought!
And then his eyes screw up in pain, trying to spread his pussy wider with his fingers so Thor’s probing head can fit. Gods, it’s just the head, the head, there’s still the whole shaft to fucking go!
“Your slutty little hole is surprisingly tiny, Loki. I apologize for all the men of before,” Thor pants, seeing that despite its stretched state it’s still merely half the girth it needs to be, Loki’s body small and Thor’s of course gigantic, cock massive as well.
“I-I’m still a virgin,” Loki whimpers, trying to grind his ass back.
“What?”
Loki manages to giggle, “Y-yes. Only you, Thor. Only ever you.”
Thor’s cockhead pops in at that moment, making them both groan loudly, Loki's hands falling forward to brace himself on the ground.
Gods, Loki is tight as anything, threatening almost to snap Thor’s giant cock in two within him, so tight and restrictive it fucking hurts.
Thor bites, “Yeah fucking right, Loki. As though you wouldn’t give out to any man with a cock as large as mine.”
Loki whines, shakes his head furiously, golden tongue busy moaning uselessly.
Thor laughs, fucks his hips forward until his balls meet Loki’s ass, reaching so far within him he can feel his head pressing into Loki’s soft cervix, high and ready to conceive at the smallest amount of seed.
Oh, Thor will do him much better than that, though.
So he withdraws from Loki to about midway, so desperate he immediately fucks back in, slamming into Loki’s hips with his own, drawing a desperate moan from his whore. He feels like heaven, sounds like a bitch in heat and grinds his ass against Thor like one too, chanting “fuck me, fuck me, fuck me” over and over again, mindlessly.
“Ah, Thor!” Loki heaves, a hard thrust moving him forward across the floorboards, reminding Thor of his beautiful tits which he’s now free to touch, eagerly does so as he shoves his hands down the front of Loki's gown. He grabs them rough, Loki’s tiny breasts not even fitting in the palm of his giant hands. Gods, how he will love to coat that creamy flesh in buckets of his seed later, take every inch of his skin and cover it in cum, fuck and eat every part of him from hand to mouth to ass until he knows Loki’s body better than his own.
But for now, he’s rather content to just fuck into his little brother's cunt with reckless abandon, the only thing in the entire world he could ever bring himself to care about at this point. He'll have to thank their father later for the fledgling journey, it had turned his muscles to stone capable of pounding his brother's ass red, his cunt puffy against the skin around his cock.
And Thor is fucking huge, filling Loki a million times better than his fingers, infinitely better than all hundreds of his fantasies. His enormous cock presses against Loki’s own on the inside through thin layers of tissue, rubbing against him so hard he’s close to cumming after only a few thrusts. He has to mentally stave himself not to do so, and when that fails, snaps of magic from his fingers increase his stamina tenfold.
Thankfully for Loki, though, Thor doesn’t seem like he can hold on much longer, either. For all the strength and stamina he has out in the woods, he’s no match for Loki’s virgin body, especially not after months of endless teasing, flirting, unfulfilling rounds of masturbation, sometimes in a row in the loneliness of his room.
He gets a few more good thrusts into Loki, fast and hard, pummelling his cunt so his juices squirt from him down their thighs onto the wood, mixing with Thor’s already plentiful precum to become a creamy, semi-transparent mixture.
“All you are is just my cocksheath, isn’t that right, Loki? Mine to fuck and to fill, breed till you’re spilling, then fuck you some more? Just something to pump cum into and children out of with your fucking slutty cunt?”
“Ah, ah, y-yes! Thor! Brother!”
Thor reaches a hand up to snag through Loki’s hair, yanking his head back so his sounds are even louder, drool running down his chin. Thor purposefully spits into Loki's open, whining mouth as he snaps, “You love that, don’t you? Us being brothers? Perhaps that's what will keep you tied to my cock, if nothing else will.”
“Ah, f-fuck, Thor!” Loki keens. Loki would never had guessed Thor would be capable of talking so filthy. But it seemed the man had many surprises, after all.
But, inevitably, Thor draws near his end, balls seizing as he doubles over his brother, fucking into him with unsteady hips a couple more times before he cums, spilling his enormous load right into Loki’s tight, warm cunt, cockslit pressed directly against his cervix so much of his sperm flows into it and fills his uterus, still more pouring around his cock and back out to fall onto the floor in audible waves.
At the sensation of being bred so full by his brother, that massive cock pumping inside of him and filling him with seed enough to swell his stomach visibly just the slightest bit, Loki orgasms. Slick cum drools from his cunt, his cock spurting a few rounds of ejaculate that would seem normal if not compared to Thor, now becoming laughable.
Thor still isn’t done ejaculating when a high shriek comes from behind them, both turning their backs to see a female servant, a glass pot breaking into a million shards with an excruciatingly loud shatter. Before she can turn to run and try to scrub her brain of the image laid before her, they all three stare at one another, just remembering.
She’s an older servant, about forty now. But she’d been twenty and pretty then when Thor was born, thirty and married when Loki had come along. Elivere. Thor's wet nurse, later their primary caretaker until they became too old for a nanny.
Elivere had reared them, carefully raised them together for years through their tender adolescence, watched them grow together from silly children to independent adults. She'd always adored their closeness, almost envied the connection they seemed to have as brothers.
And here they were, fucking like feral animals in public, the older filling the young with cum that steadily leaks down his legs at that very moment, collected into a little white lake around their clothed knees.
She finally turns to run away, glass forgotten, scarred for life.
“She’ll tell,” Loki says with a laugh.
Thor seethes. “You want that?”
“It’s inevitable, Thor,” Loki placates, reaching back to pat Thor’s muscled thigh still pressed to his own. “Just as is the child that will come from this. You just have to accept it.”
Oh right, Thor recalls, moving his hands from Loki’s sore tits to his stomach, curving his fingers around the noticeable roundness of it where it used to be entirely flat.
He feels Loki’s wet cunt twitch around him, almost as though asking him to be taken again, Loki’s eyes sparkling with that familiar challenge behind them, framed by messy black locks.
Well, Thor thinks, withdrawing his cock for a fountain of cum to squirt from Loki’s hole as he flips him onto his back, sliding his cockhead in as a promise of a second round that makes Loki grin, if he’s going to be defiled for all eternity in afterlife already, he might as well go for it as hard as he physically can.
And this time, he’s going to make Loki scream so loud the entire palace knows.
Especially their parents.