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Clark lost his sense of time somewhere after his third orgasm.
He knows it's sometime past midnight, but he could care less about the world when Bruce is inside him.
His mind is hazy. He knows he's drooling everywhere but he just doesn't care, and why should he when Bruce's thick cock is fucking him into their king-sized bed?
Bruce's thick, hard cock pistoning his hole. Every thrust Bruce does is calculated with precision, the head of just always hitting the spot, always hitting that sweet sweet spot inside of Clark, making him groan wantonly. He should feel ashamed for sounding straight out of a porno, but he knows it just eggs Bruce on, makes him thrust harder and growl deeper into his ear.
The amount of come pooling around their knees should be alarming for a human, but Clark's not really human, is he. Even under the influence of red sun lamps, the one thing his Kryptonian body retains is his stamina and short refractory period.
They've experimented with it before, but never like this. Never this intense. Rough, brutal sex that Clark didn't know he was capable of.
He knows it's filthy, being used like this, but he loves it too much.
He remembers Bruce stretching him open with a butt plug and setting the vibrations so high he came with a scream, then using said vibrating butt plug on his cock while getting his ass ate. Rao, the dark look on Bruce's face when he saw the come dribbling from his cock down to his balls. The heavy stare just made Clark harder, then made him whine when Bruce kissed the tip of his head. The image of the fucking Batman staring him straight in the eye while kissing his cock was too much, and Clark had to lie down.
It doesn't stop Bruce from eating Clark out til Clark comes for the second time then lapping up said come and pulling Clark's jaw down to spit it in his mouth, and Clark just takes all that Bruce gives him. If Bruce treats him like a whore and tells him to swallow, then he'll swallow.
Now here he is, on his stomach, ass up like some warm fucktoy to pump full of cum with. Clark's so full of Bruce, each time he penetrates his hole it's like a firework of pleasure and pain throughout his body. Every time Bruce pulls out he feels so empty, so he whines and arches his back further, wants those calloused hands marking bruises on his hips, making his asscheeks jiggle with every thrust and every spank. He wants to be the perfect cumslut, wants to hear the squelching of lube and cum in his ass forever. He thinks he could live like this with Bruce's cock just inside him, that way they're always connected.
Clark is so far gone, the overstimulation too much and when he comes it's so, so much. Kryptonian ejaculate is so much thicker than a human's, and Bruce uses it to lube up Clark's hole even more, moaning at the sensation. It makes the slide in easier, and Bruce pounds into him at a quickening pace. The way they twist their bodies is like predator and prey, and Clark is all for the taking. He can feel Bruce getting close too, and drops his elbows so the cock inside him presses directly onto his prostate. The change in angle makes both of them moan, and Bruce drills into him even harder. Clark's constant babble turns into yelps, and when he feels Bruce's cum flood his channel he fucking screams.
The last thing he remembers is Bruce's chest on his back, mouthing his neck and grinding his cock deeper and deeper before succumbing to sleep.
Later Clark will realize that there's just something about Bruce topping him and Bruce being physically on top of him that makes him lose all sense of self. Something about The Batman dominating him and fucking him into submission that gets him so hard.
Maybe it's the fact that after hours of rough sex, Bruce touches him with the utmost care. As if he's not the Man of Steel, but rather a fragile thing. He breaks down crying when Bruce wipes him down with soft touches and light kisses. Bruce stops cleaning him immediately and looks at Clark in worry, concerned at the pain the overstimulation might be causing. Clark shakes his head in between sobs, but can't communicate how deeply he feels aside from an "I'm okay,".
When Clark wakes up the bruises will be gone and the soreness will have ebbed away. The sheets will have been changed and so will his nightclothes. Bruce will still be in deep slumber, but the sunlight will seep through the blackout curtains and make him pull the covers over. Clark will hug Bruce from behind and smile in the moments in between, thanking Rao for the man who loves him.