Thread by @murcielagoAO3

#nsfw #miyacest #miyahinafour
cw: birthdays, distance, substitutes, switching, underage (Natsu)

Shouyou and Natsu know to give the twins private time together on their birthday. It's their special tradition, after all.

But this year, for the first time since they were born, they won't be in the same location to celebrate their birthday and the effect this has on both twins is unexpectedly dramatic.

Shouyou tries to appease them. "It's just a day on the calendar. Why not wait until Osamu's back

from his business trip? Postpone for a bit?"

The twins know what Shouyou's saying makes sense. But Shouyou's logic - how he's had to delay a lot of things going back and forth from Brazil so it's normal for him - doesn't quite work on the two of them, who have shared a womb.

"Samu-nii's coming up to Miyagi? Then I'll help him celebrate! I can drive now and everything!" Natsu offers during their video call while Osamu's packing for his trip.

"Oh that's great!" Shouyou brightens. "You can meet him at the airport!"

"Yeah! And I can take him to that

restaurant you like, Niisan, the one we tried last time?"

"Right, that one was so good," Shouyou moans and licks his lips. "What do you think?" he asks Osamu, who's busy folding clothes into his suitcase.

"Sure," Osamu shrugs. "Always good to see ya, Nacchan. Yer in charge."

Natsu giggles. "Leave it to me!"

They end the call and Osamu turns to Atsumu, who's sulking in the doorway with his arms crossed. "Yer awful quiet."

Atsumu tsks, shrugging.

"What're yer plans, then?" Osamu asks, zipping the suitcase. Atsumu grumbles, coming over and hugging

his brother from behind, forehead on Osamu's nape. Osamu covers Atsumu's arms with his, exhaling a deep breath.

Shouyou presses his lips together. Then he holds out his hand. "Osamu."

Osamu quirks a brow, then slaps his hand on Shouyou's. Shouyou closes his hand into a fist,

that intensely focused look in his eyes.

"Alright. Baton passed. I'll take care of Atsumu, don't worry about him at all."

Atsumu turns his head enough to meet Shouyou's gaze, and after a time some kind of understanding passes between them.

"You do that," Osamu says.

Shouyou nods. "I'll go stay at Meian's tonight. You two have fun, okay?" He gives them a smile, and touches their arms briefly before leaving the room, and then, their apartment.

A minute of silence passes. Then Osamu turns around within Atsumu's hold, hands caressing over his

brother's shoulders, neck, and into his undercut. "C'mere," he murmurs.

Atsumu sighs into Osamu's jaw, then pushes the suitcase off the bed onto the floor where everything spills out.

Osamu's "Fuck!" is swallowed by a heated kiss, and then they're stripping off clothes and

falling together in a tangle on the bed. There's an urgency fueling their closeness, hands roaming and hips canting toward each other. Atsumu guides Osamu's hand to his ass, whining, /"Please..."/

Osamu groans, stroking fingers over Atsumu's hole and holding him as he shudders.

Then he takes Atsumu's hand and puts it between his spread legs. "Shou's gonna be here to take care of ya, so... will ya take care o' me? Tsumu?"

Atsumu nods into the crick of his shoulder, and slides his hand firmly along Osamu's taint before teasing his tight rim. Osamu jolts,

hissing a breath. Atsumu's fingers start to open him up and Osamu groans, finding Atsumu's mouth and latching on.

"Relax for me Samu," Atsumu whispers. Osamu nods, groaning and rocking with him, three fingers working him over.

"Yeah, fuck, wanna feel ya while 'm away," he says

into Atsumu's throat, legs around his brother's waist. He's leaking so much already, and so is Atsumu, dripping all over his thigh. Finally his brother shifts and replaces his fingers with his cock, sinking into him with a burning stretch. They could've grabbed the lube, but he

doesn't want to stop, wants to feel Atsumu in all his raw intensity. But slow like this, forcing through the scrape and drag while trying not to let it hurt too much isn't quite working.

Atsumu tries to pull out but Osamu clings. Fuck. When did /he/ become the babyish one?

"Samu."

Osamu shivers. Atsumu rarely says his name like /that/, and his pulse kicks up a notch even as he relaxes his hold as his brother wants. He fists the bedding when Atsumu pulls away to get the lube so they can do this properly, and it's painful not to feel his touch,

to feel so empty even for those scant seconds of separation that he has to shut his eyes.

Atsumu climbs back over him, whispering soothingly as slick fingers curl juuuust right to make him jolt and jerk with pleasure shocks. Osamu begs him to hurry, lifts his hips so Atsumu can

get the right angle and fuckfuckfuck he feels so good.

The ache is still there but Atsumu's dick glides all the way in and /owns/ him. Osamu can't control the noises spilling out, probably incomprehensible anyhow. Atsumu seems to get it though, fucking into him as hard as they

both can stand it, the desperation pooling at the surface again, urging them into a state of near-animalistic single-mindedness bent on sowing as much seed as possible in a night.

Osamu's completely, blissfully sore the next morning when he has to kiss Atsumu goodbye and get his suitcase in the taxi to the airport.

When their birthday arrives, they'll both have someone they love to help them through it.

Not what they want. But it has to be enough.

---

When Osamu lands in Miyagi, Natsu is there to meet him at the airport with her dimpled smile and sassy red ponytail. One glimpse of her grin and his heart feels lighter, the tightness in his chest loosening so he can breathe again.

It's a school night so they grab takeout

and eat it in his hotel room, and then she's got to go back home and do her schoolwork. But not before she promises to take him out the next evening for his birthday dinner, and to make sure he has all the special treatment he desires.

In case he isn't sure what she means,

she gives him a little taste at the door, rising on tip-toes to brush her open lips across his hungry mouth, flattening her tits on his chest, and fitting her small hand on the bulge of his jeans and groping until the curved outline of his fully hard dick can be clearly seen.

With an impertinent swat on his behind, Natsu grins and lets herself out of the room, waving fingertips over her shoulder.

Osamu exhales, exasperated yet fond. He puts hands on his hips and looks down at his rock hard dick. "That little minx," he chuckles, undoing his fly and

picking up his phone. He takes out his dick and snaps some pics, sending them to Shouyou and Atsumu both.

"Look what Nacchan just left me with 🍆😒😡," he types, smirking.

Two minutes later he receives a picture reply from Atsumu showing a grinning and flushed Shouyou

mid-blowjob, mouth and chin sticky as he's licking up the underside of Atsumu's flushed dick, with the caption:

"Treat yer Hinata right and this's whatcha get. Looks like I'm winnin' and yer losin'."

Osamu tsks and shucks off his jeans, getting comfortable in the bed to jerk off. He and Atsumu send pics and vids back and forth until they've both gotten off.

Then Shouyou gets hold of the phone and sends pics of him fucking Atsumu's throat so hard his brother's crying in bliss

and Osamu jerks off again, coming embarrassingly fast, even for the second time in a row. The last image Shouyou sends is Atsumu's new pearl necklace dripping down his tits, and holy fuck - it's so hot he's got to set the phone down and roll his face into the pillow for a bit.

The next text is also from Shouyou: "Can't let Nacchan walk all over you. Punish her for me too, won't you?"

And /holy shit/, those words send a flood of fantasies into Osamu's brain so strong his dick twitches. Nacchan's kiss is still tender on his lips, and the feel of her

pert little tits rubbing on his chest. He licks his lips, thinking of all the things he could do to her after his birthday dinner.

He showers and jerks off a third time, mind conjuring scene after scene of a certain redhead smartypants getting debauched so prettily for him.

Whatever he imagined or planned the night before, it all goes out the window when Natsu picks him up wearing navy thigh-highs and a red pleated skirt so short it leaves a stripe of creamy thigh to tempt his gaze the entire time she's driving to the restaurant.

/Fuck./

They have a delicious meal, and banter over guessing the ingredients and what makes up the perfect bite. She acts casually innocent, but Osamu can see right through the way she leans forward on occasion, so her arm on the table pushes up her boobs and flashes glimpses of

her lacy bralette and cleavage angled for his view, but no one else's. Just under 17 and she's already adept and presenting her pretty average assets in a way that any man (or woman of inclination) would find tempting in the best way.

He enjoys the view, and lets her know

by the way he locks their gazes that he enjoys it, and her, and this is only a prelude.

Natsu's rosy cheeks deepen, and she bites her lip.

Osamu signals for the check.

In the car Osamu traces the bare skin peeking above her stockings. Back and forth. Back and forth. Unhurried.

She swallows, trying so hard to focus on the road. He's not trying to cause an accident of course, but she's their Nacchan and they all know by now how to tease and frustrate her a little, or a lot, depending.

He flattens his warm hand on the meat of her thigh and presses down,

gripping her muscle. She sharply inhales, flexing her legs on instinct. His hand's so big that his fingers wrap around the inside of her leg, so close to her warmth.

He strokes up and down her thigh over her stockings, the motion pushing her skirt out of the way across her hips.

Natsu squirms, breathing through her parted lips, but never losing control of the vehicle or missing any traffic signs, and Osamu smirks, commending her for her concentration.

She turns the car off the main road to a 2-lane with no other cars, and Osamu looks out the window

to see trees and farmland in the darkness, dotted with the occasional street lamp. Huh. Kinda remote. And nowhere near his hotel.

Natsu turns twice more to hook them around back towards the highway, and then slows the car to a stop on the shoulder of the underpass.

Osamu frowns, about to ask what they're doing here when Natsu unbuckles their seatbelts, locks the doors, and hits the lever for his seat to tip backward. He grabs hold of the car door and the driver's seat as he suddenly falls backward.

"Nacchan?!"

She's already got his belt and fly undone and his dick in her hand when she giggles and says, "Happy Birthday Samu-nii. It's my daddy's car though, so you can't make a mess."

Then she sucks half his cock into her mouth and fists the rest, getting him fully hard in seconds.

Osamu moans, gripping the car door. Natsu's mouth is so soft and warm and--oh god, so tight, her tongue so much smaller than Atsumu or Shouyou's but nearly as skilled. She struggles to take him all the way down, but he can't fault her determination.

"Nacchan, c'mere."

He rubs her back and tugs insistently on her lightweight jacket until she pulls off his cock. She aims a saucy look at him with her wet lips, but there's a hint of doubt in her eyes.

He cradles her slim neck and pulls her overtop him for a kiss, sliding hands down her curves

to grip her ass. She gasps into his mouth, legs tensing where she's kneeling across his thighs. He kisses her harder, shifting his fingers down her ass and between her legs, stroking her her damp panties along her slit.

"C'mere an' sit on my face while yer takin' my cock.

Wanna taste my birthday dessert."

It takes some maneuvering, and he has to raise his seat back up partway to get the angle, but she's light enough he can prop up her hips and reach his tongue to her puss while she braces on his thighs and sucks him down as far as she can go.

Osamu parts her slit with his thumbs, but keeps her panties in place, sucking on her clit and labia through the thin fabric until they're good and soaked. Natsu whimpers around his dick every time she's close, and He smirks, relentless yet careful not to push her over the edge.

After the third time he denies her she cries out, "Samu-nii!"

"Oh, ya want somethin', Nacchan?"

The furious look she sends over her shoulder is /priceless/.

"Go ahead and take whatcha want then, girlie."

She huffs and tosses her ponytail, nimbly shifting position to straddle his lap and face him while she takes off her jacket and throws it into the empty seat.

She reaches into her bra to retrieve a foil wrapped condom, and arches a brow before putting it on Osamu's length.

Osamu holds his dick so she can pull her panties to the side and get lined up. She eases down on him, and fuck--she's tight and beautiful and absolutely perfect. He sighs when she's fully seated, grimacing at the stretch but she's also feeling good, skin prickling all over.

He lets her lead the pace, hands stroking her waist, and then her ribs while she starts to bounce. Her neck's as flushed as the rest of her, and he pulls her to his chest so he can nibble up to her jaw, making her pant into his shoulder.

She's little and weighs next to nothing compared to their siblings, and he marvels at the strength in her thighs, her core. He thumbs across her nipples over her clothing and she groans, arching her back automatically, presenting her chest to him.

He pulls her shirt off and licks between her mounds, teeth nipping the curves above her bra. Then he folds the cups down under her tits so her nipples peep overtop, tight buds that make his mouth water.

"Samu-nii..." she whispers, so full of want.

Osamu cups her tits, barely

grazing his thumbs across her nips. Just that makes her squirm and clench around his dick, and he swallows. Then he pinches her nipples, quick and hard, jolting her on his lap.

She cries out, hands gripping his shoulders but her back stays arched, her body pressing closer.

He pinches and fondles her until she's shaking on his dick, tears pricking her eyes. Then he closes his mouth around one of her tits and suckles, his hand fisting her hair and yanking her head back.
Her stockings are all bunched around her knees now, but she's still sexy as hell.

He takes over completely and fucks into her, thrusting up into her heat and letting gravity slam her back down. She's so far gone she's at his mercy, and he hums against her breast, tonguing her nipple just the way she likes.

He lets go of her hair, and slides his hand

purposefully down her body and under her skirt to the front of her panties. He easily finds her swollen clit, rubbing unhurried circles around it that make her wiggle and jump from the direct contact. She both arches closer to his touch and shies away, suffering from overstim.

Osamu calmly switches to her other nipple and grinds his cock deep into her puss, teasing her clit until she finally orgasms, shouting and twitching on top of him. He starts to push her into a second climax, but she starts sobbing, and it's a bit early in the evening for that.

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