
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/7950919.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      終わりのセラフ_|_Owari_no_Seraph_|_Seraph_of_the_End
  Relationship:
      Hyakuya_Yuuichirou/Ichinose_Guren
  Character:
      Hyakuya_Yuuichirou, Ichinose_Guren, Hiiragi_Shinya
  Additional Tags:
      Kissing, Making-out, getting_caught, Wall_Sex, Anal_Sex, Size_Kink
  Stats:
      Published: 2016-09-04 Words: 2666
****** Little Brat ******
by Sarah737
Summary
     “Alright, fine. I’ll let you go.”
     Yuu was seconds away from cheering and lunging at Guren for a kiss
     before he was suddenly shoved out of the chair and made to stand in
     front of the now looming Guren. It always irked Yuu how many inches
     the man had over him but it also sent his gut blazing when Yuu
     realized how much bigger Guren was in other areas. Yuu buzzed with
     anticipated exhilaration, waiting as those dark hungry eyes raked his
     entire frame.
     “If you can handle what I’m about to do to you.”
Notes
     This was originally a drabble post here in my blog but due to mutual
     exchange, I agreed to lengthen this baby for my dear hanna haha I
     HOPE U ENJOY SINNER :3C
See the end of the work for more notes
“Guren.”
“What?”
“Gureeeen.”
“What?!”
“Gureee—“
“Shut the fuck up, brat!” Guren slammed his fist down on the desk, causing
objects and papers to jump and rattle on the surface before settling once more.
"What the fuck do you want, Yuu?!”
Yuu grinned and leaned on the desk with his arms bent under him. “I want to go
on a mission."
“Not a chance.”
“But Gureeen!”
Closing his eyes, Guren raised a hand to pinch the bridge of his nose, “What
part of no don’t you understand?!”
“The part where you won’t let me go on a mission. I’m old enough already,
Guren, and I’ve trained just as hard as the other JIDA soldiers! Let me kill
some vampires, dammit!”
Guren shook his head, raven bangs swaying along his head. “You’re still too
young, baka Yuu. If I send you out there, you’ll be the first one lying dead on
the ground.”
“Hey, I’m way stronger than that!”
Guren snorted, eyeing the younger male's slender body from top to bottom.
“Nice try.”
“I’m serious, Guren!”
“And I’m serious too, Yuu. You’re just a child and I won’t be convinced
otherwise. Now go and practice some more if you really want to impress me.” He
waved his hand in a careless gesture for Yuu to go away.
Yuu frowned, put-out by the man’s continued refusal but he wouldn’t be Yuu if
he gave up so easily. Making his way around Guren’s desk, Yuu swivelled the
man’s chair around and plopped right onto his lap, ignoring the “the fuck?!”
sent his way.
“Just showing you that I’m no longer a child.” Yuu said, narrowing his eyes and
wiggling his hips a little to get comfortable. That earned him a surprised
grunt and hands whipping out to halt his movements.
“By sitting on my lap? Yeah, really adult-like, Yuu.” Guren snorted although he
hadn't released his hands from Yuu’s hips yet. Disgruntled, Yuu did the first
thing he could think of. He rolled his hips and ground them hard against
Guren's.
Immediately, the older man inhaled sharply, hands tightening on Yuu who smirked
wider when he noticed the flush creeping on Guren’s cheeks.
“Still think I'm a child now?” Since he couldn't move his lower half, Yuu used
his hands instead to trail them up and down Guren’s chest before winding them
around his neck, bringing them closer together.
Guren clicked his tongue, unmoving even when Yuu was inches away from his face.
“You're such an insufferable brat. Who taught you this shit?”
Yuu shrugged his shoulders, eyes focused on the pair of thin lips before him,
“I think it was Goshi…he showed me some stuff while you guys were practicing.”
Curiosity getting the better of him, Yuu tried closing the distance between
them but then Guren grabbed a fistful of his hair and yanked him back. Yuu
released a pained yelp, whimpering when Guren didn’t ease his grip.
"Do you realize what you're even doing?" He barked, shaking Yuu a little and
the younger male released a frustrated huff.
"Of course I do. I'm trying to offer you sex so you can let me go on a
mission.” Even though Yuu said it quite bluntly, his cheeks still stained red
and he wouldn’t look Guren directly in the eye. The shyness added more to his
allure.
However, he didn’t expect the man to suddenly laugh, releasing his hold on
Yuu’s hair and hip as he felt Guren shake beneath him, “You’re seriously too
fucking naive, kid. But I’ll give you credit for trying.”
Yuu gritted his teeth. He was starting to get annoyed with the constant child-
talk treatment even when he was already propositioning himself like this for
the older male. Why couldn’t Guren just act like any other man and take the
bait!? Yuu was sick of doing nothing else but train and practice when he could
be out there, slaughtering vampires like the rest of them.
But no, he was always held back by his superiors and Guren to stop him from
fighting vampires. Well no more. If he had to let Guren use him for his own
pleasure then Yuu would do it. Yuu was going to use any means necessary to help
Guren change his mind.
“Guren, please.” Yuu looked him right in the eye this time as he begged, mouth
lined in a purse. Those purple orbs held his for a long while and Yuu began to
sweat nervously, heart sinking with every passing second until Guren’s
expression flickered and he sighed in resignation. Yuu tried not to swell with
hope.
“Alright, fine. I’ll let you go.”
Yuu was seconds away from cheering and lunging at Guren for a kiss before he
was suddenly shoved out of the chair and made to stand in front of the now
looming Guren. It always irked Yuu how many inches the man had over him but it
also sent his gut blazing when Yuu realized how much bigger Guren was in other
areas. Yuu buzzed with anticipated exhilaration, waiting as those dark hungry
eyes raked his entire frame. 
“If you can handle what I’m about to do to you.”
The slam of his back meeting hardwood ripped raucous moans from Yuu’s lips
before they were swiftly swallowed by an eager mouth. The younger male clutched
tighter against the man’s lapels, standing on tiptoes to move even closer,
press harder, feel more of that intoxicating taste Guren offered.
“Look who’s quiet now that he’s getting what he wants.” The man grinned,
licking a strip of line down Yuu’s jawline.
Yuu hissed, “Shut the fuck up, Guren.” He bit the taller male’s neck in
retaliation, pleased with the slight hitch in his voice. But when Guren
smothered his mouth once more with a twirl of his tongue, Yuu’s brain short-
circuited and he willingly let himself be pulled into the man’s expert
handling.
Winding his arms around his neck, Yuu felt the man’s hands dig under his thighs
and he took the hint. He jumped and his entire body was further pinned to the
wall as he now relied on Guren to support him, legs squeezing the man’s waist.
They were so caught up in each other that they didn’t hear it when the door
swung open. Only the abrupt sound of someone clearing his throat did Guren
release himself from Yuu’s lips with a wet pop, whirling around and looking
like a deer caught in the headlights.
Shinya stood before them, fair eyebrows raised high above his forehead, looking
quite surprised and a bit amused. Yuu said the first thing that came to mind.
“It’s not what it looks like…”
“I can see that.” His blue eyes twinkled merrily as they darted back and forth
between the two shocked males.
Shinya was never going to let them live this down. “Well then, I’ll just come
back another time.” With a parting wink at them, Shinya backtracked towards the
door and shut it behind him.
Yuu and Guren looked at each other and released a strained breath at the same
time.
“Oh and don’t forget to use protection.” Shinya popped his head in one last
time.
“Just get out!” Guren threw his sword at the door which had swung shut the
moment he did, Shinya’s laughter echoing with him. His sword fell in a clatter
on the ground and Guren swiped a tired hand down his face.
Yuu couldn’t help it. He chuckled into the man’s shoulder, body trembling as he
uselessly tried to stifle his amusement.
"What's so funny?" Guren grumbled, hiking Yuu up higher on his hip. He was
pleasantly surprised that the man hadn't let go of him yet. Which meant they
weren't done here. 
Yuu lifted his head to place a soft kiss on the man's lips, giggling when Guren
chased after him as he pulled away, "Just thinking you're really cute is all.
Didn't think you could be so uncool too." He stuck his tongue out at him when
Guren sent him a baleful glare. 
"I'll show you cute, you brat." And once more, Yuu found himself swept away in
the all-encompassing heat of Guren's mouth, teeth sucking on Yuu's bottom lip
and plundering his wet cavern when the younger male gasped in pleasure. 
Yuu tightened his thighs around Guren's waist, rocking a little to ignite that
arousal within him again. He could still feel the press of something hard
against his hip and Yuu moved to rub against it, grinning into the kiss at the
groan he heard. He released his own needy sounds as well when Guren took hold
of his jacket and stripped Yuu off it quickly doing the same with his pants and
shorts. 
He had to let go of Yuu in order to shuck them off but the moment Yuu stood
bare in front of him, Guren was on him again, kissing him and carrying him
until his back hit the wall once more.
Like this, with him naked, Yuu could see the differences in their sizes too
clearly, the huge bulge in Guren's pants secretly exciting Yuu. He accepted the
fingers shoved inside his mouth, lapping at them and getting them all wet while
Guren buried his face in the crook of Yuu's neck, mouthing along the flesh
there. Yuu shivered, feeling his wet mouth creating a fiery path all over his
shoulder and collarbones, teeth biting to create hickeys all over. 
"How the fuck are you holding me up this long?" Yuu inquired, breathless, hands
tightening on the back of Guren's shirt just in case he got the bright idea to
drop Yuu. 
“You’re just so damn light, Yuu.” Guren grinned roguishly, his wet hand sliding
down Yuu’s sides before groping his ass. The younger male shivered at the
feeling, arching into the touch when he felt fingers circling his entrance.
Leaning forward, Guren pressed their lips together again, pulling Yuu into a
sloppy kiss. They savored each other’s taste as Guren dragged his tongue across
Yuu’s mouth, both moaning desperately against one another.
As he was distracted, Guren inched one finger inside Yuu, quickly followed by a
second. Once he felt them force their way into his ass, Yuu was moaning
helplessly and curling his toes. Muscles tensed around Guren’s fingers, pushing
in and pulling out over and over again, until two fingers became three, and Yuu
cried out when they began to stretch him out wider.
"Come on, come on, Guren." Yuu panted against his ear, wiggling his ass and
clenching his walls around the digits to let the man know he was ready. Guren
seemed to be impatient too as he didn't question it when he pulled his fingers
out, leaving Yuu whining at the loss of the stretch as Guren opened his pants
to let his dick out. He lined himself up with Yuu's barely stretched, wet hole,
standing there for a moment to make eye contact with Yuu. Yuu nodded his head
rapidly in open permission. 
Then in one fluid motion, with a forceful push, Guren buried himself deep into
Yuu’s tight heat. They both sucked in a sharp breath at the sudden impact,
panting and gasping breathlessly as they adjusted to the raw burn of their
connected bodies. Yuu clenched around Guren, squeezing him with such delicious
pressure, Guren was almost dizzy with delirium, absorbing the heat and
tightness around his throbbing cock. But excitement was bristling under his
skin, and Guren pulled out, cock dragging against twitching insides and making
Yuu shiver at the sensation.
His cock wasn’t completely out of Yuu before it was harshly shoved back in,
forcing a strangled gasp out of the younger male. Guren didn’t say anything, no
warning, before doing it again, and again, and again, until Guren built into a
fast-paced rhythm. His hips were ramming violently into Yuu, who whimpered from
the unyielding thrusts. There was no room for pause or rest, just frantic gasps
and moans. 
"Y-You're so...rough." Yuu gasped, angling his body into Guren’s pounding,
feeling him completely as he rubbed against his insides.
"Do you want me to go slower?"
"...no. I want more!" 
Before the words even left Yuu, Guren’s erection met Yuu’s prostate in one
brutal thrust. It was uncontrollable and dangerous, a collision that was
dripping with wanton need, turning Yuu into a puddle of sexual pleasure. And
Guren, realizing what he had done, lost it and went wild at Yuu’s prostate,
going harder and harder at it.
“Guren,” As if it were the only word in his vocabulary, Yuu gasped and panted
his name, grabbing hold of Guren's shoulders and relishing the ride. His back
moved up and down against the smooth wall behind him, rocking to the frantic
movements of Guren's thrusts. 
His back was arching, his body begging and yearning for more, and Guren gave it
exactly that. Guren was pounding furiously into Yuu, as if he was upset that he
couldn’t somehow go deeper or that it wasn’t enough. Sweat slicked their flesh
as Guren gripped onto Yuu’s sides, fingers digging into soft skin and leaving
angry marks behind. His breaths became erratic as he leaned down and
aggressively scattered kisses and bites around Yuu’s neck, sinking his teeth
into gorgeous fair skin and savoring the sound of Yuu’s strangled voice. Guren
continued to leave possessive marks all over Yuu’s body, feeling his own body
mercilessly thrust into Yuu, burning hot with untamed passion.
Then, all of a sudden, Guren stuttered, shoving and jerking uncontrollably into
Yuu, who was keening as he felt Guren cave into the pleasure. Guren released
inside of Yuu, the hot liquid of his cum shooting hard and deep inside of Yuu’s
trembling body, completely filling his tight hole. At the same time, Yuu came
hard under him, spurting onto his torso. They shivered as they let the feeling
of sexual bliss consume them, moaning through the pleasure. Guren could feel
the sticky liquid smearing against Yuu’s insides as he slipped out, his
satisfied cock bobbing out slowly. Before him, Yuu was a hot mess, shaking and
panting breathlessly, so hot and pliant with only Guren's hands holding him up.
Lolling his head back, Yuu released an exhausted sigh, body still twitching
from Guren's rough handling, "Damn, that was..."
"Sorry, couldn't hold myself back." Guren murmured, hands caressing the hand-
shaped bruises on his sides. Yuu shook his head and opened his eyes to face the
older man. No doubt his face was just as flushed and wrecked like he looked.
"No, it was good. I-" Yuu cleared his throat, not wanting to give Guren too
much of an ego for his fucking skills. But as he was placed back down on the
ground, legs nearly buckling under him, Yuu realized one thing. 
"You didn't use a condom!" 
Guren rolled his eyes, turning away from the glare sent his way, "I didn't have
time to get one 'cause you were so excited to have me in you already."
"W-What! Don't phrase shit like that! I was not excited!"
Guren snorted, moving back towards his desk after he finished tucking himself,
"Sure and you weren't squeezing my dick like you never wanted it to leave."
Eyes widening, Yuu gritted his teeth and was two seconds away from stomping up
to the older man and giving him a roundhouse kick if his body parts weren't
sore right now.
"Now go change, brat. Your assignment will be delivered to you soon."
All thoughts of vanquishing Guren left him at those words. Yuu brightened, face
breaking out into a happy grin as he cheered whilst dressing himself back up.
He ignored the cum in his ass for now and was going to pay Guren dearly for
that later but he was too excited at the prospect of a mission to care. 
Guren shook his head watching the puppy-like happiness exuding from Yuu. He
wondered if what he was doing would be alright in the long run.  
Hell whatever. The sex was good. 
End Notes
     im a sinner
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