Thread by @An_Aphorism

#shirocest nsfw, frot, fingering, dubcon (for no communication)

It happens gradually. Their tiny dorm means it makes more sense to have one bed than two & as twins they’re used to sharing.

If Shiro wakes up with Kuro wrapped around him, well it’s nice sometimes to be held.

But then sometimes Shiro wakes up to his brother pressed against him in other ways, rutting his cock against the seam of his ass.

Shiro always tries to move away but Kuros arms will tighten and a sleep murmured ‘just a little’ gets Shiro to stay. After Kuro comes

from rutting against Shiro’s ass, Shiro quickly excuses himself to the bathroom where he stands in agony under the cold water.

-

It keeps happening. Not every day, not even a lot. Kuro flirts and takes women out, and according to their new college friends, is a hot commodity.

But he never brings them back to the dorm. Shiro doesn’t know if his brother sleeps with the women, but he must at least want to with the frequency that he’s rubbing off against Shiro.

And then there’s the morning where Shiro wakes to Kuro pushing down Shiro’s boxers.

Shiro makes a sound of protest, but his brother presses closer, “just need a little more, chill.” Then his cock, his brothers bare & wet cock is pressing between Shiro’s thighs.

Shiro flushes hot, turned on and ashamed. “Press your thighs together.”

He shouldn’t, but he does.

Kuros not gay. Or at least there’s never been any indication that he was. There’s always been the women.

But Shiro is, & he can’t help what this does to him. Kuro fucks his thighs, moving hot and fast against him, and Shiro can barely hold in his own gasps.

When his brother

comes it’s a searing hot mess spilling across his thighs. Kuro sighs and rolls back into the bed. Shiro doesn’t look, doesn’t touch, just takes himself to the shower.

Months later Kuro takes him almost nightly, and sometimes doesn’t even wait until the morning. He gets

Shiro up on his knees sometimes and fucks between his thighs and it’s /so/ close to actual fucking and it’s been /so/ long since Shiro’s gotten a hand on himself that he almost, almost comes untouched when his brother pulls back and spills on Shiro’s ass.

But it’s only when one night Kuros fingers creep down to his hole, that Shiro knows he’s doomed.

This is relief for Kuro, but it’ll be totally different if Shiro gets off. It’ll be something bad & dirty & /wrong/. He can’t and he can’t—

And then Kuros finger breaches him.

His brother barely has it up to the knuckle before Shiro is crying out into the pillow &coming. Gobs of it spill, all the repressed desire, the hot filthyness of it, laid bare.

Shiro wants his brother to fuck him. Then, in dawning horror, he realizes he’s spoken it aloud.

/end

PART2: #shirocest nsfw, anal, dirty talk.

Kuro swears, but the fury or disgust Shiro expects doesn’t appear. Instead there’s a click of lube from nowhere and two fingers pushing into Shiro’s hole.

Shiro’s /just/ come, but the arousal swells again, far from sated after such long denial.

“I knew you wanted it,” Kuro says as he fingers Shiro open. The other hand reaches around and touches Shiro’s mess, smearing it lewdly on his already rallying cock.

“How long you been holding this in? Always running away to jerk off in the shower,” Kuro leans close to whisper this like a secret, his fingers pressing deeper than anything’s ever been. “But you’re hot for your own brothers cock, aren’t you?”

Shiro gasps as something electric

burns up through his core from where Kuro is buried in him.

“No,” he pleads into the sheets. “I don’t— I haven’t,” he can barely get the words out.

“It’s okay,” Kuro says, as gently as he does after one of Shiro’s nightmares.

“I’m gonna give you what you want,” there’s a kiss to Shiro’s neck that makes him blush hot. “And you’re going to give me what I want.”

Then Kuro is pulling his fingers out and his teeth are biting into Shiro’s shoulder. Shiro whines, electric, and arches. He begs with

his body for something to fill the sudden emptiness.

Not something. Someone. His brother.

It’s so wrong, but he can’t help how his cock is full and heavy once more, how his mouth opens and he pants, “please, please!”

“Be good for me,” Kuro guides as the head of his cock touches Shiro’s hole. “Be sweet, and ill be sweet for you.”

Shiro’s on fire, he has to close his eyes against it. It’s Kuro, his brother, his everything. The cock presses in and Shiro /moans/.

Shiro’s messed around with a few guys before, but he’s never been fucked. Never like this. And Kuro just /knows/ him. He takes Shiro’s body like he knows all his secrets.

Shiro’s lost all control. Kuro fucks him full and it hurts, and Shiro just whines and writhes

With how much he loves it. It’s exactly the sweet and sour cut that his brother is. Brutal when he thrusts in, but soft with the kisses he drops on Shiro.

“So good, fuck I’ve been dreaming of this. Your tight little ass. You parade around here in those

boxers, making me want you.” Kuro slams in. “And now you’re mine,” he gasps, “every night, mine—“

Shiro’s nearing his edge, too fast yet again but he can’t hold on to anything with Kuro. Kuro is already under all his barriers, and every word just ruins Shiro.

“Ku—ro, I’m—“

Kuro curses and the rhythm speeds up, Kuro dragging him back on his cock. “Yeah, yeah. Come on. Come for me little brother, come on my cock.”

And Shiro, powerless, does just that. For a second time he comes without a hand on him, driven by the battering

of Kuro against his prostate and the snarled, heated voice in his ear detailing how /good/ Shiro is, and how Kuro has been waiting to have him like this.

“Just for me,” Kuro gasps.

“No one else,” Shiro confesses as he comes. He suddenly wants Kuro to finish,

to come in him to desperately. He wants to be good enough for his brother. “Only you,” Shiro says, “I’ve never—“

Kuro makes a punched sound when he understands.

“Kuro, fill me, please, I want it— I want—“

Then Kuros weight is shifting and he’s grunting, pushing all the

way inside Shiro and spilling hot, hot liquid.

Shiro listens to every breath and sound of pleasure, feels every pulse of his brothers cock as it comes in his hole.

It’s wrong, but nothing has ever felt this good. Even when Kuro pulls out and the wetness immediately

spills out, he doesn’t move. Doesn’t want to. Just wants to savor it a little longer.

“What a pretty sight,” Kuro says, and his finger is scooping the wetness up and pushing it back into Shiro’s hole. “Maybe this is how you should greet me when i come home

after class. Wet and open and ready to be taken.”

Shiro doesn’t know what to say. His face is still red hot. He settles on just his brothers name.

“Yeah,” Kuro says, like that answers every unspoken thing. “There’s no going back now, huh?”

Kuro gentles Shiro onto his side and spoons up behind him. Shiro calms in the familiar hold.

There’s a moment of silence and then Shiro gathers his bravery. “I don’t want to,” he says. It’s a shameful truth, but /fuck/ he wants his brother. Wants him in ways he shouldn’t.

“Good,” Kuro says and drops a kiss on his cheek.

Shiro gets his brothers hand, and curls it in his own. “Good,” he says, in agreement.

/end

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