Thread by @murcielagoAO3

💖✨ some hinahinamiya just for you, Ro! #nsfw cw: underage

When Sho and Natsu come back from their shopping trip with twin devil-smiles on their faces, Tsum knows he's in for it. When Sho hands the little black bag from a favorite adult store over to Natsu, who giggles and skips into the bedroom, he groans, stomach clenching with the

dreaded combo of fear and excitement that is the calling card for the Hinata siblings. "Don't look so worried," Sho says, climbing into Tsum's lap on the couch. "Yeah right," Tsum says, licking the smirk off of Sho's face before Sho tips his head back and tongue-fucks his mouth.

"Ahem!" Natsu says, catching them mid-makeout. Tsum looks over Sho's shoulder and his jaw drops. "Fuck!" he exclaims, wild eyes darting all over Natsu's outfit—if this even qualified. Her tiny breasts are framed snug in a black, open cup bra that's more straps than cloth, which

matched, more or less, with the strap-on harness hugging her hips. The harness with the big, black dildo jutting from it, 9 inches of gleaming silicone in a girth that has his mouth running dry. "Yep! That's the idea!" Natsu grins, sauntering over to the couch, or as much as a

girl of 16 can saunter. She casually puts one foot on the edge of the couch, showing off her black stiletto pumps. She tosses two black objects to Tsum, who catches them, frowning—what the? Kneepads? Sho giggles. "I think you better put those on, Tsum," he says, nibbling

Tsum's cheek. Tsum looks from Sho, to Natsu, and feels his face go red hot. Sho and Natsu lead him into the bedroom, and he groans the entire way, that combo of dread, fear, and excitement making him uncomfortably hard. At the bed, Natsu unceremoniously pulls down his pants, then

sits him down so he can put on his kneepads. Tsum looks at Sho for reassurance, but is met with devilish delight and fingers tweaking his nipples through his tanktop. Then Sho turns to Natsu. "You're good with opening him up?" Natsu rolls her eyes. "Of course, niichan." Sho leans

over and kisses her, gentle and hot and sweet, but when they pull away to look at Tsum, there's nothing but hunger on their faces. "Lay back, Tsumu-nii," Natsu orders, and Tsum rushes to comply, propping his head in the pillows. Sho climbs up next to him, and Natsu between his

legs. Sho chuckles, and pulls the pillow out from under his head, and passes it to Natsu, who smacks him on the thigh so he'll raise his hips. Tsum whines, but lets her put the pillow under him so his ass and balls and everything else is on display. "What's the matter?" Sho asks

taking off his clothes and kneeling naked beside Tsum. "Are ya... mad at me or somethin'?" he gives both of them a worried glance. Sho grins wider, and Natsu lets out her cute, girlish laugh. "Awww, why would you think that, Tsumu-nii?" Sho strokes a hand through Tsum's hair.

"Maybe you sprung this on him too quickly," he says to his sister. She pouts, but climbs carefully over Tsum's lap to straddle his waist. "But I wouldn't do this if I was mad," she says, bending down to kiss him. Tsum moans in pleasure, big hands encircling her waist, gripping

her tight. Sho whistles, enjoying the view. He reaches over to the nightstand and pulls out the lube, and a couple of Tsum's toys that might be useful. Natsu looks so cute and tiny astride Tsum, Sho feels his dick hardening at the luscious sight, glad he had a chance to eat her

out in the backseat of the car before they came in with their purchases. He palms her backside, then gives her a playful swat. "Hey, aren't you going to fuck him?" Natsu giggles, and pulls away from Tsum, saliva strings connecting their lips. "Yep!" she agrees, resuming her

position between Tsum's legs. Sho hands her the lube and the two dildos from the drawer, a couple of sizes smaller so she can work up to her strapon. "Thanks, niichan!" Sho winks at her. He reaches for Tsum's rock hard dick, and strokes it a few times. Tsum grunts, writhing.

"So what—ah!—brought this on—ahhh!—exactly?" Tsum asks, breathy with desire. Natsu makes a show of lubing her fingers before tapping them on his entrance. Tsum shivers. "Well you were my first dick, Tsumu-nii," Natsu explains, working two fingers at once since her hands are so

slim. "So I thought, why not be my first ass, too!" She grins, and Sho grins, and Tsum closes his eyes, laughing in surrender. "Alrighty," he says. "Baby's got her first strapon, so let's get her a notch on that belt." Sho laughs, and straddles Atsumu's ribs. "I knew you'd get

it!" he says, palming Tsum's pecs. "I'll do my best!" Natsu says, slipping in two more fingers. Tsum moans, fisting the bedding as she twists her wrist. "Nacchan, I can have his mouth right?" Sho quirks his head back to look at her. "Sure! I'll have him ready in a jiff." Sho

traces Tsum's lip with his thumb. "Thanks!" Tsum's belly clenches with growing need, and he lowers his jaw, already salivating. Sho scoots up and gets into position, guiding his cock into Tsum's waiting mouth. Tsum holds on to Sho's perfect butt cheeks, Sho's hands fisting his

hair as he fucks into Tsum's throat, and Natsu works him open with tiny hands, and then his toys, finding the angles that make him cry out, muffled as it is by the dick down his throat. "Don't make him cum," Sho warns, Tsum's fingers digging into his flesh. "I /know/, niichan,"

Natsu huffs, then rails the larger dildo all the way to the base. Tsum arches, and Sho groans. "Coming," he whispers, and then jerks, spilling hot spurts of cum all over Tsum's tongue and the back of his throat. Tsum swallows frantically, his dick jumping between his legs and

begging to be touched. "I think he liked that!" Natsu reports, watching Tsum's reactions avidly. "Course he did." Sho licks his lips, and sits back, freeing Tsum's mouth so he can catch his breath. Tsum feels blissful, half out of it from being used so well by his two favorite

siblings. "Hey, don't fade," Sho laughs, caressing Tsum's face and moving to lie down beside him. "How's he doing?" he asks Natsu, who pulls the dildo free with a squelch. "He's ready," she says, licking her lips. Sho brushes Tsum's sweaty hair from his face. "Time to turn over."

Tsum rolls slowly to his stomach, his hole stretched and dripping, twitching in anticipation. Sho takes his place, and guides him over to his lap, where he rests his cheek on Sho's thigh. "Up!" Natsu commands, rubbing the backs of his thighs as he gets to his knees, grateful now

for the knee pads. He hears the lube cap and trembles, both wanting to be fucked and kinda scared of Nacchan being the one with the dick, it's so hot and so surreal he's not sure of anything but wanting to cum, and wanting Nacchan to be the one to do it. She squirts more lube on

his asshole and pushes it in with her fingers. "C'mon," he pleads. "Remember to go slow," Sho says to his sister, who sticks out her tongue. "Only if I want to," she retorts, grinning like an imp. Sho chuckles and cards his hand through Tsum's hair. "Remember how sweet and loving

he was with you? Nacchan?" Sho points out. "That's why I love Tsumu-nii so much," she says, caressing Tsum's cheeks in reverence. Then she lines up her strapon, and begins to push. Tsum's breath leaves him all in a rush, that thick dildo breaching him and slowly easing inside,

inch by inch. Nacchan holds him steady, spreading his ass cheeks and pausing every so often, until she's bottomed out. "Nice, real nice Tsum," Sho says. Tsum nuzzles Sho's lap and then hangs on to his waist as Natsu starts pulling out. Tsum whines, the dildo dragging along his

walls and shocking him with how good it feels. He distantly hears Sho talking to Natsu, guiding her in what to do, and whatever he says, it works—Tsum starts shaking from the intensity of it all, dick swaying between his legs, so aroused he's slipping into some other state of

being. Sho turns his head, caresses his face and nudges his mouth open so his hardened cock can slip back between his lips. Tsum salivates, sucking and licking it while Natsu starts to thrust more seriously, driving that black dildo so deep he's seeing stars. His awareness is

on them and them alone—Sho's cock dipping into the tightness of his throat, and Natsu fucking him, ramming him with that big strapon so good it's like she was born with it. He's panting, trying to breathe with tears welling in his eyes from the slams against his prostate, knees

driven harder and harder into the bed from Natsu's deceptively strong thrusts. She gets into a rhythm and then adjusts until she has him singing with desire, near-choking on Sho's cock from delerium. Sho fists his hair, groaning and shouting a warning before his balls empty for

the second time. Tsum takes it all, swallows everything but the last spurt which lands on his lips and cheek, Sho quivering with pleasure under him. "Nacchan," Sho says, and it must be some signal because Natsu gets up on one knee and then pistons her little hips so she's exactly

aligned with his prostate, stroking it over and over and shocking him into a blinding, furious orgasm that pulls a scream out of his throat. It goes on a long time—she's relentless and Sho is praising them both but Tsum can't totally understand the words, between the wild squirts

of cum going everywhere and the tears running over his cheeks. He goes limp on the bed, twitching with the aftershocks until Natsu finally pulls out, sitting back on her heels, and wiping the sweat from her forehead. "Beautiful," says Sho, hands caressing Tsum's head and neck,

anywhere he can reach. "Both of you," he adds, reaching for Natsu who comes over to lie on her back next to him, head on his other thigh. For a while none of them move, just blissed and sated. Then Natsu leans over and peppers kisses all over Tsum's face, wiping the tears from

his cheek. Tsum grins up at her, rolling his upper body enough to pull her in for a more serious kiss. Sho leans back in the pillows, satisfied to watch them fool around until they have the energy to go get in the shower. "Thanks, Tsumu-nii!" Natsu says, giving him an exaggerated

smoooooooch. Tsum laughs, tucking her into his chest. "My pleasure, Nacchan," he replies. They reach for Sho who kisses them both, all of them laughing and tangled on the bed.

<3

epilogue/omake:

Osamu comes home early and finds them like that—Tsum's gaping ass, Natsu's strapon the obvious culprit, and Sho's smug little smile, the clear instigator. Once they've all showered, he play-spanks Natsu and Sho, and then he and Tsum fuck their brains out. <333

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