Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/5229692.
  Rating:
      Explicit
  Archive Warning:
      Choose_Not_To_Use_Archive_Warnings, Underage
  Category:
      M/M
  Fandom:
      終わりのセラフ_|_Owari_no_Seraph_|_Seraph_of_the_End
  Relationship:
      Hiiragi_Gyurei/Hiiragi_Shiren
  Character:
      Hiiragi_Gyurei, Hiiragi_Shiren, random_worker
  Additional Tags:
      gyuren, Twincest, Public_Sex, Onsen_sex, Incest, why_do_i_keep_on_writing
      public_sex, ...., gureshin_lovechildren, by_cali_and_nica, one_of_many
      that_i_will_post_lol, not_canon_in_verse
  Stats:
      Published: 2015-11-17 Words: 2889
****** The Onsen Trip Gyu Did Not Ask For ******
by Sarah737
Notes
     TO: THE TWINS
     HBD I HAVE NO REGRETS
     LOVE: AUNTIE SARAH <3
See the end of the work for more notes
Gyu groaned as he sank down in the hot water of the spring, the heat relaxing
his tense muscles as he leaned back against the smooth rocks of the bath’s
edge.
“Satisfied?” Shiren smirked, seated across his brother with a towel headband
over his head to prevent his bangs from getting wet.
“Ugh. Haven’t felt like this in a long while.” It had been a hectic week of
missions and duties left and right for Gyu and this hot spring trip was a
godsend sent by his parent for his and Shiren’s birthday. Although, if Gyu had
his way, he wouldn’t have wanted to bring his twin along with him. Who knew
what kind of dirty tricks Shiren would pull at him and ruin his only relaxing
day?
“You know what else can satisfy you, Gyu-nii?”
Gyu heard a splashing sound near him and when he opened his eyes, Shiren had
moved closer towards him, purple eyes half lidded and a teasing smile on his
face. It was an expression Gyu was all too familiar with.
Rolling his eyes, Gyu looked away and pushed Shiren, none too gently from him,
“Tch. Shiren, I’m not up for any of your antics today.” It was a secret that
both of them swore to keep between themselves ever since they first
experimented on each other in the darkness of their rooms. Gyu wasn’t proud of
committing such a forbidden act but he blamed his hormones and Shiren for most
it.
The white haired teen raised an eyebrow at his brother but he obediently moved
back, smoothly swimming towards his spot where there was a small waterfall
flowing down the side of a small rocky structure.
Getting an idea, Shiren languidly stood up from the water, uncaring that he was
displaying his bare self to his twin since it was just them in the spring.
Removing the towel over his head, Shiren stepped under the waterfall and tipped
his head back, enjoying the beat of water against his skin and the intense gaze
staring at him on the other side.
Fuck you, Shiren Gyu thought viciously as his eyes couldn’t resist trailing
down the elegant dip of his twin’s back, the ripple in his muscles as he
brought his hands up to smooth long, white hair back, and the tempting curve of
his ass.
It shouldn’t be so arousing to see your twin naked because he knew what a
little shit Shiren was but fuck, Gyu felt heat stirring in his gut. Knowing how
all that pale skin fitted under him once made Gyu want to touch the white
haired teen all over again.
“You know, Gyu-nii, there’s no one else here and we have a room rented all to
ourselves.” Shiren pulled back from the spray of water to tilt his head towards
Gyu, a flirty smile rising on his full lips. “Why don’t we enjoy it to its
fullest?”
Gritting his teeth, Gyu felt his self restraint slipping, imagining all the
things he could do with Shiren under that waterfall, against the rock surface,
inside their room…
Afterwards, Gyu didn’t know who moved first but suddenly, Shiren had walked the
few distance between them and was kissing him fiercely. Arms instantly moving
to wrap around his twin’s slender waist, Gyu didn’t bother to care who started
it as he pressed his lips harder against Shiren’s. Their bodies were slick as
they inched in closer, their mouths hot as Gyu glided his lips down Shiren’s
neck before biting onto his twin's collarbone.
“Heh…y-you’re always so easy to persuade…Gyu-nii.” Shiren muttered, tilting his
head back to give his brother more room as he tightened his hold on Gyu’s dark
hair, clenching hard on the other’s shoulder.
“Shut up.” Mouthing on a supple flesh around Shiren’s shoulder, Gyu enjoyed the
shiver he got in return, before he slid his hands down his twin’s back to cup a
pert rear. “Or else I won’t be so merciful to your ass later.”
“Do it. Fuck me as hard as you can.” Shiren replied without hesitation, pulling
at his twin’s hair to bring his face up and kiss those lips again. Biting on
Gyu’s bottom lip, Shiren slipped his tongue inside the warm cavern and moaned
when Gyu closed his lips around it and sucked.
Gyu pushed Shiren against a smooth rock surface, holding him there with the
grip on his shoulders as he practically devoured his twin in the kiss. Opening
and closing their mouths together with saliva dripping down the corners of
their lips, their hot breaths mingling interchangeably, Gyu felt heady and
aroused all over, mind swimming in a haze of lust.
Shiren brought his hand down between their bodies and took hold of Gyu’s
hardening erection in a tight fist. Gyu gasped against his lips and Shiren
smirked as he swallowed his twin’s moans, stroking the hot shaft up and down
slowly.
“Are you feeling it already, Gyu-nii?” Shiren breathed, lightly tracing his
lips around his twin’s cheekbone before licking a path down his cheek to his
strong jawline.
The eldest twin groaned, moving his hands down Shiren’s waist to cup soft,
round cheeks, squeezing them both in his palms and making Shiren squeak against
his mouth. Pushing Shiren’s hip flush against his pelvis, Gyu moaned at the
hot, wet feeling of their dicks sliding against each other, digging his fingers
into the supple flesh of Shiren’s ass. Oddly, he felt something hard between
his twin’s ass cheeks, and when he ran a finger down his crack, Gyu immediately
found out why.
“You had a vibrator inside your ass this whole time?” The hunger in his voice
was unmistakable as Gyu circled a finger around the swollen hole, slightly
pushing the instrument in deeper, “No wonder you were aching for me.”
Shiren chuckled with a slight shrug, “Just preparing myself for later.” He
whispered against Gyu’s ear, satisfied with himself when he felt the hot dick
twitch in his hold. He knew Gyu couldn’t resist when he saw him like this, toys
stuffed inside his ass, ready for the taking. It sent a shiver down Shiren’s
spine because with this, he had his twin wrapped around his little finger.
“Or now. Take me now, Gyu-nii.” His voice was breathless and dirty to Gyu’s
ears and he didn’t have it in him to resist any longer. Licking his lips, Gyu
took hold of the vibrator and began shoving it in and out of his twin’s
entrance, smirking when Shiren gasped and clutched desperately at his shoulder,
back arching before him.
“Y-Your cock...already. Gyu-niii...ahh!” Shiren didn’t like waiting for long
and his hole was already twitching maddeningly around the toy moving inside
him, wanting something bigger, hotter…
“Tch.” Gyu clicked his tongue, already raising one of Shiren’s white thighs and
pressing his twin against the surface behind him, “Craving for my cock already,
you slut?” He traced his wet fingers around the edges of Shiren’s puckered
entrance, feeling how the vibrations made Shiren’s hips twitch and shake before
without mercy, Gyu pulled the device out of him.
"Fuck.” Shiren gritted his teeth, unable to hold back the shiver that raced up
his spine when the drag of the instrument grazed against his prostate. Looking
up at Gyu under his wet bangs, Shiren made sure to lock eyes with his twin’s
before, he quirked his lips into a devious smirk. Taking hold of Gyu’s hand,
Shiren guided it down his entrance and whispered hotly against his lips, “Do
you feel me ready for you?”
Gyu couldn’t handle the teasing any longer. The moment he pressed his fingers
inside his twin’s loose, soft hole, and prodded right against the spot he knew
well, Shiren threw his head back and released a long, loud moaned. With how
erotic Shiren was being in front of him, Gyu felt his self-control snap.
He immediately twisted the white-haired teen to face the rock surface, ass
jutting out towards Gyu’s throbbing cock and Shiren laughed at his brother’s
frantic actions. “If you cum before I tell you to, I’m not letting you walk for
weeks.” Gyu growled out in warning, before he spread his twin’s supple ass
cheeks apart and shoved himself right inside the delicious heat.
Oh god, he feels so good. Gyu couldn’t help but think as he buried his dick
further into Shiren’s ass until the very hilt was in, his balls hitting against
his twin’s. He could hear Shiren taking shallow breaths, see his hands
clenching and unclenching against the rocks as Gyu moved in deeper and deeper
inside him.
Then just as Gyu began moving in and out, Shiren releasing a strangled moan
from the short thrusts, there was a clicking sound as the door to the bath was
opened. Jolting as they both realized somebody had come into their bath, Gyu
didn’t have half a mind to pull out and instead carried Shiren to the side,
where they were hidden from view.
“Sorry sirs, but I’m going to need to fix some water circulation for a bit.
Then I’ll be on my way.” Somebody called from the front and Shiren clicked his
tongue in annoyance at the disturbance. He gasped a bit when Gyu shifted behind
him as his twin told the worker “it's fine” with a cold, low voice. Obviously
Gyu didn’t like this situation either.
He was holding Shiren tight by the hips, cock still thankfully erect inside him
as they both hid from anyone’s sight. However, Shiren couldn’t help but think
of using this opportunity to tease his brother. With dark, purple eyes lit up
in a mischievous gleam, Shiren suddenly clenched hard around Gyu, hearing him
stutter a gasp as he dug his fingers in his flesh.
“What are you doing?” Gyu hissed, pressing Shiren against a rocky surface to
get him to stop moving his hips.
“Fucking. Or are you going to let some staff worker stop us?” Shiren looked
over his shoulder to raise an eyebrow at his twin, sending him a derisive look
that he knew would only anger him. And just to rile his brother up even more,
Shiren clenched and unclenched around the hard dick buried inside him,
shivering at the soft pants and growls his twin made in reaction.
“F-Fuck! Stop that...Shiren.” It was too much for Gyu, the feel of Shiren’s
muscles throbbing continuously around his dick made him groan in frustration,
wanting to fuck his ass hard and fast. If only that damn worker was gone
already, Gyu could...
“Haha, why? W-When you’re so hard inside me, Gyu-nii?” Shiren whispered,
shaking his hips and rolling them back and forth to entice his brother even
more.
Gritting his teeth, Gyu was going to teach his younger twin a little lesson.
Grabbing a chunk of Shiren’s white hair, Gyu pulled his brother back until he
was flush against his front, hand splayed on Shiren’s chest to keep him steady
there. Then he began moving, hips slamming against the other's, cock driving
deep inside Shiren, making him choke and clamp a hand on his mouth to muffle
his moans.
Even if he knew Shiren might scream any moment, Gyu didn’t let up. He liked the
dazed and flushed look on his twin’s face, his pretty features twisted in
pleasure and his purple eyes bright with lust. It was probably horrible to feel
aroused at his own twin’s debauched appearance, but Gyu couldn’t stop himself
from thinking it. Wanting to see more of those expressions, he kept pushing and
pulling his hip backs, keeping his thrusts shallow so that the water sloshing
between them wouldn't alert the worker of their actions.
If Gyu wanted Shiren to get mad or embarrassed, he was sorely mistaken as
Shiren enjoyed the feeling of the thick cock finally prodding against his
insides. Winding an arm back to place a hand on Gyu's neck, Shiren tilted his
head back to kiss his brother, moaning and groaning into Gyu's mouth as
intoxicating heat spread from his hips and up his body.
"D-Don't you...hah...like this, Gyu-nii?" Shiren mouthed against their lips,
breaths intermingling as he tightened his grip on Gyu's hair. "The m-man
could...walk in on us any minute--ahh!- now. See you with your d-dick buried in
me...taking your twin so indecently, it's...erotic."
Shiren snickered quietly when Gyu tightened his hold on his hips, dick
twitching against his walls which was further proof of his brother's mounting
desire for him.
Growling against Shiren's ear, Gyu murmured, "Stop talking, you slut. I swear,
you're purposely firing me up to destroy your ass. Is that what you want?" He
emphasized his point by pulling back agonizingly slow until the very tip was in
before he slammed his entire length back inside in one quick motion. "Huh?
Shiren."
The white-haired teen flung his head back and gasped, jaw dropping to release a
silent scream. Thankfully, in the next second, the sound of a door clicking
shut resonated in the bath, the man finally finished with his job.
Gyu didn't waste time any longer.
Taking hold of Shiren’s wrists, Gyu pulled them back the same time he slammed
back in, pushing his cock deeper inside his twin and getting him arching in
pleasure. Shiren cried out, body shaking as he was held up by his brother’s
hold on his wrists, his twin thrusting even faster and faster that Shiren was
having a hard time keeping up as much as he’d hate to admit it.
Every time Gyu pounded against Shiren's prostate, his hole would spasm and
clench around him, spurring him to do it over and over again.
“Y-You’re getting tighter, Shiren. Fuck...It’s like you’re trying to milk my
cock.”
“Gyu-nii…that’s what I-I’m...ahh!...trying to achieve.”
Wanting to get back in control, Shiren pushed his ass back, clenching his inner
muscles around the thick cock moving inside him rapidly, balls bouncing and
hitting against his. Hearing Gyu’s groans and gasps excited Shiren even
further, the sounds of skin slapping against skin filling the bath area.
Feeling his release approaching, Shiren took hold of his own weeping dick and
began stroking it in time with Gyu's thrusts.
Breathing hard, the twins moved simultaneously, bringing each other into higher
planes of pleasure.
“Ahh!...I-I’m close...Shit--nghh!-- Gyu-nii!”
“D-damnit...Shiren…”
Pressing his forehead against the surface of the smooth rock, Shiren felt the
hard length slam against his prostate repeatedly, tightening the coil in his
gut and heightening the pleasure until finally, it released and unwound in a
flurry of sparks behind his eyes. His vision seemed to whiten as Shiren spurted
all over his hands and on the rocks, crying out a single name in the empty
space.
“G-Gyu-nii!”
Shiren’s broken moan of his name was Gyu’s undoing. WIth one last final thrust,
Gyu buried his cock deep inside his twin and emptied all of his seed in that
hot, tight channel, groaning loudly in turn.
Shiren released a shaky breath as the high of the afterglow soon left him, legs
wobbly that he could barely stand. Then unexpectedly, Shiren released an
“oompf” as strong arms wrapped under his legs and back, Gyu carrying him out of
the bath and down on the soft ground. Gyu only raised an eyebrow when Shiren
shot him a look before the white haired teen shuddered as he felt Gyu’s cum
sliding down his thighs.
He looked up at his brother to see him staring down between his legs with
purples eyes darkened and pupils blown. Bringing his hand down between his legs
to open up his hole dripping with his brother’s cum, Shiren whispered huskily,
“Clean me, Gyu-nii.”
Gyu normally would have resisted such a request but maybe it’s the heat or the
afterglow of sex but Gyu wanted more of his twin’s taste.
Turning his twin on to his hands and knees, Gyu spread apart his twin's ass
cheeks and felt his cock twitch at the sight of white liquid flowing out of the
swollen entrance. Giving his brother a small bite on the plump flesh, Gyu
licked down his brother's crack before he settled tracing his tongue around the
puffy hole.
He could taste the bitter tang of his seed inside Shiren but Gyu ignored it as
he dipped his tongue in and licked around the soft walls.
"Mmmm...right there...ngh...Gyu-nii...ahhh...so...good." Shiren moaned low and
loud, body flushing an arousing red as the coil in his gut tightened every time
his brother licked him. He couldn't help the urge to push back, wanting more of
Gyu's tongue inside, already desperate for another intrusion, his hole
twitching in excitement.
Unable to handle the sexy moans his twin was releasing, Gyu pulled back and
flipped Shiren onto his back, leaning over him like a predator crawling on top
of his prey. Glaring at the cocky smirk on his twin’s face, Gyu leaned down and
brought a hand to circled around Shiren’s slowly hardening length.
“I can’t believe we’re doing this today of all days. Better be prepared for
later because I’m not going to let you cum this time.”
Shuddering in excitement, Shiren swung his arms over his brother’s neck to
bring him even closer to his face, “Hehe, happy birthday to us then.”
End Notes
     i blame everyone and no one for this XD
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