Chapter Text
"Can you take another?" Loki asks, and that is how it starts.
Thor is sprawled out on his back before him, his knees drawn up and spread wide. Tonight Loki has his fingers buried inside of his brother, and he wants to see Thor open up for him and take even more. He loves the way Thor's body is so naturally pliant, so capable. He wants to test Thor's limits. He wants to give Thor everything, if Thor will have it.
It took months just to talk Thor into letting Loki touch him this way. Once that line was crossed, Loki was surprised to find that Thor didn't just allow Loki to penetrate him, but he truly enjoyed it. There is nothing more potent than seeing his strong and mighty brother, bent to his whim and eager for whatever Loki can give to him. Now Loki has fucked him several times and fully introduced him to the joys of having his ass played with. Now they do more than play.
Thor rolls his hips against Loki's hand, greedy for more, but he is already so full. Loki has three fingers crooked into his brother's slick hole. He knows Thor can take another. He edges his little finger against the rim of Thor's entrance, teasing the stretched skin. He stays steady while Thor twists his hips and groans.
"I... I'm not sure," Thor gasps, looking doubtful. His pupils are blown wide with lust.
"Just a little more," Loki says, stroking his brother's lovely thighs. "I know you can do this for me."
He does.
Thor comes hard with four fingers stuffed in his ass.
…
The next night, Loki's manages to push four fingers and the extra width of his knuckles into his brother.
Thor comes twice.
…
The night after, Loki gets his thumb inside with the rest. The pressure is incredible. Loki clenches his fist inside his brother's body. Thor clenches his inner muscles around his brother's wrist.
…
It's difficult work, attaining such a stretch. Loki spends hours in between sessions coating Thor's reddened hole with a healing salve. He teases with his fingers, circling against sensitive skin and pressing until Thor can hardly bear it. Other times, Loki pushes Thor's thighs up and soothes him with his tongue instead.
…
The first time Thor comes with Loki's fist in his ass, he collapses from the intensity of it. Loki cannot contain his lust – having Thor accept so much drives him over the edge. He jerks himself hard over Thor's back, spattering him with his seed. After only a moment's rest, Loki is hard again, and ruts into Thor's slack body, until they both come a second time.
Thor's orgasms are staggering with Loki's hand inside of him, but the sensation itself – of being so stretched, so open and full – is addicting. Thor feels so well used, he needs an encore.
The next night, Loki opens him up again, somewhat more easily. He slides his cock against the rim of Thor's hole, where it's stretched tight around his hand. After Thor climaxes, Loki makes him keep his ass lifted into the air. He rubs his fingers against Thor's hole, and slips them inside, admiring how Thor's body gapes open for him now, how loose his once-virgin brother has become. Loki presses inside in one quick thrust, even more aroused by the way Thor's body is lax around his cock. He can rub himself against Thor's inner walls, but there is little pressure, little tightness left. Loki thrusts into Thor for several long minutes, enjoying the strange sensation, and then pulls out.
With just a couple strokes, Loki comes directly on Thor's open hole. He smears his seed across the reddened muscle with the tip of his cock, and then uses it to push his come inside of Thor's body. When he's done, he licks Thor clean, enjoying the way his tongue sinks into Thor with no resistance whatsoever.
…
Loki kisses him after, thanks Thor for doing this for him. He considers it almost like a mountain that they've climbed, something to check off an imaginary list without need of revisiting. For Thor, it's a new possibility that he wants to linger in. He's far from had enough.
They try to resume normal lovemaking, but Thor aches for more. A week later, he asks Loki for his fist again, and Loki obliges. It takes another two nights to work up to it, but Thor has never felt so fulfilled in his life. And Loki loves to give Thor as much as he can take.
…
After Loki makes Thor come on his fist, he withdraws his hand and replaces it with his cock.
Loki isn't exceptionally large, he isn't enough to really fill Thor after being so stretched, and that's what he comes to love about this. His brother's hole is so loose after taking his entire hand. Thor's ass gapes open for him. Loki can slip into Thor without hesitation, rutting hard and deep into his open body. Thor feels like some whore's slack cunt – soft and wet, his inner walls trying to clench around him. It makes Thor squirm, trying to find more friction and failing, his body far too open.
Loki knows his cock isn't nearly big enough to give Thor the stimulation he needs now, and the knowledge makes him cum even harder.
Loki spills inside of him, and then fists Thor's slick hole until the thunderer comes once more.
Afterward, Thor can't keep Loki's seed from leaking out of his body even if he wanted to.
…
They both love how loose Thor becomes. After a while, he can accept Loki's cock effortlessly, at any time, and even his fist with very little stretch.
The accomplishment comes with drawbacks.
If they are apart for more than two days, Thor's body manages to tighten itself up again and they have to start all over.
They both find that they hate it. Thor is especially vocal about his discontent. He can't even finger himself while he's away – not the way that he needs it now, because even four fingers wouldn't do. He needs a better stretch. He needs to be filled.
Loki comes up with the solution to their problem. Midgard is charmingly perverse. He finds a large plug, aptly nicknamed 'Hulk', that keeps Thor filled nicely. It's not quite the size of Loki's fist, but it's enough to keep Thor's body from closing up whenever they must be separated.
Thor takes to wearing it all the time.
Loki loves the way it looks when Thor spreads his thighs for him, and the heavy plug is already seated in Thor's slutty ass. He loves how desperate it makes Thor, how awful it must be to be so stretched and unfulfilled at the same time. He loves easing it out of Thor, leaving him gaping. Loves to hook his fingers into Thor's ass and pry his hole even further open, make his big strong brother cry out for mercy. He loves shoving his dick into Thor's hole, and feeling Thor's internal muscles trying so hard to tighten around him. Loves to slap Thor's ass and tease him about how loose he is, how he must not even feel it anymore. Loves to fuck into the sloppy channel and leave his seed deep inside. Loves to daydream about filling Thor's gaping hole with his cum until he is overflowing, and then plug him up with it. Such a task would be impossible, of course. Unless he enlisted help.
…
The next time they are together, Loki tells Thor about his fantasy of filling him up. Tells him how he would ask the guard for their services. The very men who pledged their lives and bodies to the prince... fulfilling that oath in a very different way. Every royal guard in the kingdom would take their turn coming inside the crown prince, one after the other, until he was dripping. None of it would be enough for Thor, of course, no matter what their numbers. No mere cock could satisfy him in such a state.
So Loki suggests two at once.
Thor climaxes at the very idea, even though he only has Loki's cock in him. Shocked, gasping, he spills over his own belly, and Loki follows shortly thereafter.
The idea sticks.
…
Thor sinks onto Loki's cock easily. He tries to clench around Loki, and bounces on top of him, seeking friction, seeking more. They gave Thor a day for his body to tighten up, but he was still loose enough that Loki could stick a finger inside of him and barely touch his inner walls.
"Lean forward," Loki says, grabbing Thor's ass and spreading him while Thor bent forward, nearly lying on top of Loki's chest.
It makes it easier for Loki's clone to line up behind Thor, to press his cock against Thor's hole where Loki is already sank inside of him.
Thor's body is stretched, but not enough for the clone to slip in. Not just yet.
He groans as Loki – he isn't sure which – works a finger in alongside his cock, and then a second one. The tip of the clone's cock nudges inwards again, while the fingers stretch him. After a minute, the head of Loki's cock replaces the fingers, managing to slip in. Thor freezes, going tense, and both Loki's hold still. Then slowly, the second presses inward, slipping forward. Thor's body eases open as readily as ever, stretching until Thor finds himself full once again.
"Move," Thor groans, and then Loki is fucking him – two cocks in alternating thrusts into his stretched and greedy body. He comes without touching himself, all over Loki's chest, and then his brother fills him with twice as much seed.
…
"You are so loose, brother," Loki says, making Thor keep his ass high on his hands and knees so Loki can play. "I think even if I never touched you again, you would never be quite like before."
He sticks his cock into Thor, grinding against Thor's backside once and then settling back on his haunches. He wraps his hand around his shaft, keeping just the head of his dick inside of Thor's body. Then he moves his hand, shaking his cock inside Thor's open hole, slapping him from the inside. It's obscene, and it makes them both groan.
Loki wants to try something more. He withdraws, pushing a slick fist into Thor's body instead. His brother moans loudly, finally able feel something substantial, finally able to clench on Loki's hand.
But Loki doesn't fuck him yet; he isn't finished. Instead Loki rotates his wrist carefully, until his curled fingers are just so. Then he lines himself up, and pushes his cock into his hand. He is grasping himself inside Thor's body.
The extra stretch makes Thor gasp, makes him double forward and leak precum onto the floor. He begs for movement, and finally Loki starts to thrust, fucking into his own fist.
Finally Thor is tight again.
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