Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/4724456.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      刀剣乱舞_|_Touken_Ranbu
  Relationship:
      Kashuu_Kiyomitsu/Yamatonokami_Yasusada
  Character:
      Kashuu_Kiyomitsu, Yamatonokami_Yasusada
  Additional Tags:
      First_Time_Blow_Jobs, tantou!Kashuu, oodachi!Yasusada, Hand_Jobs,
      Deepthroating
  Stats:
      Published: 2015-09-04 Words: 4608
****** Sneak Little Peek ******
by Hitsugi_Zirkus
Summary
     Maybe it was dirty, to have these desires while in the bodies he and
     Yasusada had, but Kashuu wasn’t exactly pure in the first place.
Notes
     This is it kiddies, this is my golden ticket to hell, please remember
     to visit my condo because once you read this, you're all going down
     with me.
     I always wanted to write oodachi!Yasusada/tantou!Kashuu. But not like
     this. Not like this. (But do I regret? Not as much as I should,
     probably.)
See the end of the work for more notes
Being small had its perks, despite whatever Izumi no Kami had to say (all of
which Kashuu was forced to listen to until he walked away because gods that
damn sword had a lot to say, and when it wasn’t about himself, it was about how
tiny Kashuu was and how his feet could barely touch the floor when he sat in a
chair and that he shouldn’t go on sorties because it was far too dangerous for
a child - all while smiling widely. Kashuu once just kicked him squarely in the
shins and climbed up into Nagasone’s arms for protection).
For example, he could have beauty naps when he wanted and no one faulted him
for it, including the saniwa who only thought all the tantou precious and
spoiled them a bit with treats. That was the one good thing about Kashuu’s
small frame, having the others think him cute and give him attention. No one
could resist his large red eyes and full-lipped pouts.
Well. Mostly no one.
“Yasusadaaaaa, you promised this time!”
“No? I don’t believe I did?” The response had an exaggerated lilt of
uncertainty, Yasusada’s eyes glancing to the side as if trying to remember this
mythical promise.
Or rather because he was lying. Kashuu had - fortunately or not was up for
debate - been with Yasusada long enough that he could read through every one of
his annoying expressions of airiness, and by now he trusted not a single one of
those innocent blinks or that finger pressed on Yasusada’s chin. Actually,
Kashuu should’ve expected this reaction when he first padded into their room
after chores, sliding the door shut and murmuring his request.
“I’d remember such a thing.”
Right now, Kashuu got the deep impression that he was being forced to recall
aloud the deal that had been made, which he himself could remember very
clearly.
All day and night whenever he was alone, it was all he could think about,
making him rub his mostly bare thighs close together. The memory was hazy but
the sensation of wet lips pressing on his own, and long fingers slipping down
the waistband of his short-shorts was not unclear to him by any means.
Actually, just thinking of it now made Kashuu’s cheeks fill with heat.
He turned to his last piece of arsenal to defy Yasusada’s bait (because always,
always this man was teasing him, giggling in the back of his throat at how cute
he was, but the heat in his voice made Kashuu being called that sound less
annoying than when Izumi no Kami said it). Giving a huff, he crawled onto
Yasusada’s lap, reaching up to circle his arms around his neck, his hands
tangling into the long mess of dark hair. Kashuu loved nuzzling into it, and
making Yasusada hum in content against his ear whenever he ran his fingers
through it.
“Hmm, what’s this? You’re being awfully needy right now.” Yasusada smiled as he
said it. It was one of those half-muted smiles that was the extent of how much
sincerity could be in the gesture. Yasusada didn’t smile enough as it was, so
sometimes, Kashuu just took what he could get. Besides, that smile accompanied
by those prying, knowing eyes was the ultimate combination in making Kashuu’s
knees weak.
Good thing he was already on his knees. Kashuu tried to keep focus, twirling
some of Yasusada’s thick hair around one of his fingers.
“Yaaasuuu-niiiii~,” he lilted, wriggling his hips a little for good measure,
“I’m saying ‘please’ like you tell me to. Isn’t that nice enough?”
The ocean-blue of Yasusada’s eyes momentarily clouded with something darker,
but then the airiness was back, and he leaned back to prop himself up by his
arms. Everything from his neck to his chest and naval suddenly felt as though
they were being offered up to Kashuu.
“Alright.” A hand reached out to brush down his cheek before withdrawing. “Only
because you asked nicely,” the corner of Yasusada’s lips turned up again, this
time for a smirk, “like a good boy.”
Kashuu’s front cracked a bit, from the words coupled by the abundant offering
of Yasusada’s much larger and stronger body. But that was the difference
between a tantou and an oodachi for you. Kashuu just never truly thought about
it before when during such intimate situations, Yasusada was always so close,
enveloping him completely. But now that the reigns had been thrust over to
Kashuu, he found he had no idea where to start. He knew what he wanted, but
Yasusada usually built up his touches before moving on to what could really get
Kashuu into a mess.
With another tilt of his head, Yasusada asked as if reading his mind, “Or maybe
this is a bad idea after all?” He gave a playful buck of his hips in offering,
and Kashuu’s pulse jumped at the motion and tenseness in his thighs. Then his
expression became a little more serious. “I told you that this might get scary
or will hurt you. Or embarrass you.”
Kashuu scowled, hating how matter-of-fact Yasusada sounded. More rationally, he
knew that this worry was rightly placed, but Kashuu was full of curiosity and
affection, both of which Yasusada always allowed Kashuu to indulge in himself.
Huffing again, he put his small hands down on Yasusada’s abdomen. “I know that,
I know that! It’s just... I was thinking about how you touch me. So if we’re
doing it like this, then I should try to, like, get you aroused too, right?
That’s how it goes.”
“That’s how it goes,” Yasusada said, but the agreement was neutral. “Trying to
arouse me though - that’s lewd.”
“I-it’s more lewd for you because you’re the bigger one!” Kashuu argued. To put
a silencing period to his answer, he started to undo the winding tie of his
hakama, Yasusada wriggling to help him without a word. Kashuu didn’t pull them
down, but instead used the chance to slide off his scarf and draw back the
opening of Yasusada’s robes, showing off the line of collarbone, and - it took
some maneuvering to reach it so maybe the aggression of the gesture waned a bit
- Kashuu bit down on it. He bit down as hard as his little jaws could, because
Yasusada liked the pain.
Yasusada hissed quietly, but he didn’t pry Kashuu off. Kashuu licked over the
bite mark like Yasusada did for him. As he did so, he glanced up at the lustful
dark tint of Yasusada’s gaze.
“Gross masochist,” he muttered.
Yasusada didn’t refute it, but he took the moment to untie the bow of Kashuu’s
red scarf, the warm fabric slithering off his skinny neck. Kashuu knew the
feeling of those long fingers grazing against his throat as well - never
wrapping around it, but just the illusion of his life pulse under Yasusada’s
control to wrap around and stutter his breaths, and Kashuu had no idea why he
imagined such a thing ever happening…
Oh. Maybe he was a gross masochist too. But that was something to delve into
another day. Right now, Yasusada could barely stand to hurt him in any way that
went beyond a hickey or two at his collar and the innermost part of his thighs
that his shorts barely covered (if at all), so close to his…
Back on task, Kashuu licked and sank his teeth at more of Yasusada’s skin that
he could reach, and the lower he moved, heart pounding in his ears with nerves,
the harder he breathed, as if he was the one being touched.
Yasusada was warm of course, his skin soft, firm at his muscles and ah, Kashuu
felt feeble and bit harder to make up the difference, and he sucked over a spot
when he could as well. He wanted Yasusada to be turned on.
“Hey,” he said, only because the embarrassment was starting to outweigh his
pride, “is this doing anything to you?”
Yasusada didn’t look much different, save for the addition of some reddening
marks and slightly parted lips that would let out stunted grunts. His robes
were starting to fall from his shoulders, the folds already opened up enough to
end right at his naval. Yasusada nodded down to the barrier of the hakama’s
waist.
“Why don’t you check? What you want is there anyway, right?”
Don’t answer my question with a question! Kashuu pressed his lips together, his
body nestled between Yasusada’s thighs. The cloth was actually not that thick.
Kashuu could already make out the outline of Yasusada’s cock, its swelling
lifting up the fabric more and more. A shudder ran sharply down his back, and
his hands hovered anxiously. It was his first time undressing Yasusada like
this, but he got himself into this position in the first place by proposing it
all, and not just this physical initiation.
“Hey, Yasu-nii,” Kashuu only addressed him like that when he wanted something,
and even fully sated and his cum being swallowed down Yasusada’s throat, there
was one more desire he could think of wanting fulfilled, “maybe next time… I
could put you in my mouth instead?”
That one request that led up to all this, and his nerves were starting to shoot
him down. His own slow build of excitement was starting to wane.
But it’s just Yasusada so... Kashuu sucked in some breath and opened up the
last fold of Yasusada’s hakama, gathering it down at his thighs. The sight
below was enough to make his heart start racing faster than their best horses
in the stable.
It wasn’t the first time he’d seen Yasusada’s cock. It was however, the first
time he’d seen it erect, redder and bigger and oh no this was probably a
mistake after all. Kashuu was realizing it now as he just stared at the rather
thick curve that rested on Yasusada’s naval. The nerves didn’t return for
simply out of fear out of not knowing what to do though, no, it was just that,
well -- could his mouth even open up wide enough for it?
Yasusada’s lips smacked and Kashuu glanced up just in time to see his tongue
retreat back in his mouth. He didn’t say anything. He didn’t need to. Why he
decided to warn Kashuu to think this through properly was now obvious, a
literally large and pressing issue before them.
Then, Kashuu got angry. Not sincerely so. But in the way that made him puff his
red cheeks childishly and burst out, “Th-this is ridiculously big, isn’t it?”
“I don’t know. I always thought it was pretty average? I don’t know what’s
oversized or not by human standards.” Yasusada looked at him, his gaze filling
in the gaps of his unspoken words, but Kashuu did not need them repeated. He
knew already, he knew, but the thing was, he already said he’d do this and
besides… He wanted to try putting his mouth on it anyway. It was more of
Yasusada. Kashuu always...wanted more of him.
“Need help getting started?”
“W-well, you do this to me…” Kashuu reached out, caressing his palm against the
base. It was warm, really warm, and he could swear he felt Yasusada’s pulse
against his hand. When he tried to wrap his fingers around it and move against
it, he found it not only (wonderfully) heavy in his palm, but also difficult to
fully curl his fingers around. Somehow, that excited him.
Oh boy.
Kashuu got both hands on Yasusada’s cock, moving them up and down,
familiarizing himself with its feel and weight and shape just as much as he was
trying to give pleasure. Mirroring memories of this being done to himself, by a
hand larger than his own of course, he kneaded it with his thumb and teased his
fingertips at the tip. Up and down and up and down and squeeze. It was awkward
to do with two hands, but the jerks of Yasusada’s cock said that he was
apparently doing a good job.
So he was actually doing this - touching Yasusada like he always touched him.
He lacked the finesse, yes, but he was still doing it, and somehow he felt like
he leveled up. It was always Yasusada doing this to him, but finally he knew
what it was like to be on the giving end.
The accomplishment only lasted a few seconds before Kashuu felt awkward
repeating the movements. He heard Yasusada’s strained, breathless laugh, then,
“Go up. Squeeze the head - no, not actually on it, right under, put your thumb-
- Hnn~! Ah...yeah, there… Then when you move up and down, touch the vein… Haa…”
Kashuu drank in Yasusada’s advice with eager ears and hands that were more than
willing to pick up this new skill. Although at first it hurt his ego a bit to
move blindly and have the criticism, once he heard those first hitched breaths
and soft, pleasured sounds at the back of Yasusada’s throat, Kashuu found
himself shifting his thighs a bit. He repeated the techniques provided for him,
watching with fascination the flush fill Yasusada’s cheeks and his cock.
“Weird… It’s twitching a lot…”
“Haah… Yours does the same, you know. Right in my hand...in my mouth...”
“Sh-shut up! I mean… Well, yeah, but…” At a loss for a comeback, he takes
action instead. As revenge, Kashuu gave insistent rubs at the ridge under the
head, applying as much pressure as he could and he saw Yasusada’s thighs tense
again. Now, a liquid had built up at the tip, slowly dribbling down from the
slit.
Victory. But Kashuu was fascinated. He wasn’t even disgusted when the liquid
dripped down to meet his thumb, and instead he just smeared it experimentally
over Yasusada’s shaft.
Ah… Yasusada’s getting wet... This was good, right?
Yasusada licked his lips again. “You’re getting skilled at this. Mmh… Should I
let you do this more?”
“You should,” Kashuu agreed with a pout, falling for the provoke. “I can make
you feel you good too.”
Yasusada raised his brows, apparently amused. “Lewd,” was all he said.
Flushing and impatient because still this man was teasing him so much and
daring to judge him, Kashuu wriggled down before he kicked him or worse (his
cock was in his hand after all; Yasusada was far too trusting), then, acting
before nerves got him again, he licked the side of Yasusada’s shaft. He did it
again and again, a little higher to clean off a stripe of cum like he was
liking up melting shaved ice. Then he gave a sloppy, audible kiss, right at the
ridge.
Yasusada’s resulting sharp gasp sent a spike of satisfaction right down
Kashuu’s small body.
Following immediately after that though was the desire to hear more.
His lips kissed from base to tip, pressing the flat of his tongue over the
throbbing vein under Yasusada’s cock. He wanted to know if maybe Yasusada liked
pain here too, but he thought maybe to save that for another time. Too much
progress had already been made, and the adrenaline was pounding in Kashuu’s
head.
Then finally, he licked his now sticky lips, just now taking in the slightly
salty taste of Yasusada’s fluid. Even after smacking his lips a bit, the taste
lingered at the back of his throat and the roof of his mouth. It...wasn’t
entirely unpleasant.
“That’s good,” Yasusada murmured, voice a tint lower than before, but it was
also rich with lust. Kashuu had a sudden memory of that same lust looking up at
him, pinning him to the wall when Yasusada took him in his mouth, easily
swallowing him down as he held Kashuu’s thighs tight to keep him from falling
weak with pleasure.
Maybe with a hint of desperation, he put Yasusada’s dripping tip against the
corner of his mouth, almost nuzzling it affectionately to him. “I’m not done
yet,” Kashuu said, and even his voice was strained. He wanted Yasusada. He
wanted to give him what he’d always been spoiled with. Yasusada, despite all
the ways he could be annoying, protected and loved Kashuu like no other. In
retrospect, sucking cock was probably a crude way to give thanks, but Kashuu
was too shy to say the words.
And so, while Yasusada looked at him in half expectation, half curiosity,
Kashuu licked up some more cum, then kissed the tip. He had one hand at the
base and another at the shaft, feeling the anticipating swell and twitch of
Yasusada’s cock.
“Yasu-nii.”
“Yes?”
“I love you.” Kashuu closed his eyes and put his lips around the tip. He pulled
back slightly, then pushed further down. The taste and feel of the heated
column of flesh made him flushed, and yes, if possible, Yasusada was even
bigger when inside his mouth. Kashuu just managed to get maybe a centimeter or
two below the head before pulling back again, and while he knew it was
pathetic, he also couldn’t particularly get upset. Just that initial stretch
was almost too much, and Kashuu marvelled at the newfound emptiness of his
mouth.
It really is ridiculously big. But he wanted to get good at this, he wanted
Yasusada to know that he was worth having around, because even though he was
small and treated as naive, he was still a child beneath the river, which meant
like it or not, he did have certain knowledge of these things. And maybe that
was dirty, to want to be able to do such sexual things in the current bodies he
and Yasusada had, but Kashuu wasn’t exactly pure in the first place.
As it was, he was grateful for his hakama that hid his own arousal.
“Hmm,” Yasusada hummed, oblivious to these thoughts, “don’t do too much. You
might tear your throat.”
“When we have these bodies though, that’s alright,” Kashuu reassured
confidently.
Yasusada raised his brows again, then reached out to pet Kashuu’s head. It
stayed there, almost encouraging him to go for it once more. “Alright, I won’t
stop you. Maybe this will be how you learn.”
Now that Kashuu knew there were better noises Yasusada could be making with his
mouth, Kashuu braced himself, slicking up his lips with saliva and leaning down
again. It was easier this time to accept the tip then head inside his mouth now
that he had a better idea of what to expect. The saltiness of Yasusada’s
spilled on his tongue again, then the back of Kashuu’s mouth as gradually, he
tried to take in more. But Yasusada was too much, so much, and he knew there
was no way he was going to be able to fit it all.
The struggle made his cock stir again, and he shifted his thighs anxiously to
attempt delaying desire for stimulation.
(He really was a masochist, wasn’t he?)
His mouth was parted so much, and tears were building at the corners of his
eyes. Every time he tried to swallow more, the tip of Yasusada’s hard cock
bumped the back of his throat, tensing the muscles there for a choke and cough.
Each clench made more tears pool in his eyes.
“Mmh! Ngh…!”
“That’s as much as you can handle it in the end, huh?” There still had to be
five or six inches left. Yasusada petted Kashuu’s head again. “That’s good.
Hmm, it feels really warm in your mouth. Really wet too - I can feel your
tongue twitching under me.”
It was getting to be too much again, but Kashuu also didn’t want to stop. His
feverish mind scrambled to think of what to do next, and his hands scrambled
around the base just to have something to do, to make Yasusada love him and his
touches. As it is, he exhaled raggedly through his nose, an unattractive sound
but he tried pushing his tongue against what he can, and he also attempted a
small suck.
Fingers twitching in Kashuu’s hair, Yasusada shivered, his back arching just
slightly. His lips parted for a soft, keening, “ahhn~”. Kashuu let out a small
whimper himself, and he wondered if Yasusada got this excited just from his
moans too.
He sucked the tip, slowly so not to take in too much more and gag. His throat
already hurt but Kashuu kept Yasusada inside him and whimpered and clenched to
hold back chokes, and his lips were feeling numb and swollen as he gave
attention to the large cock in his mouth. It was easily enough to fall into a
rhythm, and kneading his thumbs up and down the rest of the shaft kept his mind
occupied off the strain.
Yasusada was frowning now, his other hand curling into the sheets of his futon.
His hips gave minute movements from side to side, apparently anxious for
something. Whatever it was, Kashuu wanted to encourage it.
He pulled back finally for some relief, saliva coating the head of Yasusada’s
cock thickly. Then, heated, pressing one hand between his own skinny thighs,
Kashuu rasped, “I’ll be good, so-- Show me you love it, Yasu-nii.” And then he
was trying to relax his jaw and throat again, swallowing Yasusada down.
And that seemed to be all the permission Yasusada needed. As soon as Kashuu was
clumsily around the swollen cock again, Yasusada let out the deepest growl in
his throat, and he thrust his hips up.
Kashuu tried to make a surprised sound, but all that came out was a loud, wet
choke, and his throat protested the sudden, thick intrusion forcing his walls
open. But Yasusada’s hand in his hair prevented him from moving back, and his
hands stutter in their actions to dig his nails into Yasusada’s naval.
He whimpered, again and again and it hurt so much, but then Yasusada was
sighing in pleasure as his hips began to slowly undulate. He pushed in and out
between Kashuu’s lips, stuffing his mouth full of his cock, forcing everything
open wide. Saliva sloppily dripped down Kashuu’s chin and he looked up. What
expression he was wearing he had no idea, but the downright delighted look on
Yasusada’s face had a powerful effect on him enough that it temporarily
distracted him from the pain.
Yasusada’s bottom lip was bitten down on, his eyes desperate and chest heaving
with each gasp and low moan.
And it striked Kashuu then, how this was all his doing, that Yasusada loved the
feeling of his mouth and hands and nails that much, that just one little nudge
with his words caused him to finally let go of whatever was making him hold
back before. Finally, he wasn't being treated like he was delicate, and he
could see and feel now just how much Kashuu could please him too. The thought
pleased Kashuu - for a second. Because Yasusada was fucking his mouth, and
Kashuu was choking around his cock and tears were freely spilling from his
eyes.
“Hhgh! Mmph...! Mmgh!”
It occurred to Kashuu that he should’ve asked Yasusada not to look, because he
was sure his face was blotchy and tear-stained and sweating and now his hair
becoming unkempt with how Yasusada gripped it, but not too tightly. He was a
mess - even when he was the one who finally got to do something for Yasusada,
he was still the one in a mess. The hand he had between his legs gripped his
cock hard through his hakama.
The slight relief whenever Yasusada pulled back didn't last long as his hips
snapped back up again, his cock bumping against the back of Kashuu's throat
before forcing its way down once more. The sloppy sounds strung out from their
union were loud in Kashuu's ears, and he could hear every slick slide in and
out, of his own drowning gags and desperate breaths and Yasusada's moans
filling the room with hot, passionate air.
A few times, Kashuu caught a more torn look in his eyes, his hold letting up as
if he was going to push Kashuu off, but then Kashuu would make a small, weak
whimper and that was enough to rekindle Yasusada's desire. Try as he might to
deny it, Kashuu was finding the same true for himself. Although scared at
first, having that bait of relief only to have it stolen by the control
Yasusada was exercising over him - it was - thrilling. And so Kashuu went along
with it, letting Yasusada bury his cock in his mouth again and again until
Kashuu no longer had thoughts, just blue eyes and gratified moans and
Yasusada's cock stuffing his oral cavity past its limits.
“Aah… Haa, Kashuu… You’re doing really well... More than I expected." For once,
the compliment didn't seem to hold an airy undertone to it, and Kashuu tensed,
scratching down Yasusada's skin. Yasusada smiled. "I love you so much,
Kashuu." 
Throat raw and pain in his jaw, Kashuu's body still managed to tense all at
once, his loud moans pounded back down his throat by Yasusada's cock. Kashuu's
own jerked violently under his clothes and he closed his eyes. When he was done
from his rough orgasm, exhaustion immediately overtook him. Luckily, Yasusada
seemed to understand what had just happened and readjusted his grip at the back
of Kashuu's head. He bucked his hips in and out, pulling out more and more each
time, until just his tip pressed against Kashuu's slack lips. 
Yasusada's breaths were ragged, his words strained as he murmured, "You should
move, Kashuu, before I make a mess on your face."
Sore and trying to catch his breath, Kashuu nonetheless registered the hot
weight of the cock's tip on his lips, and he leaned into it, closing his
bruised lips around the slit. He'd been brought this far anyway, that accepting
Yasusada's orgasm didn't seem as gross or messy to him as it might've been half
an hour ago. If anything, Kashuu wanted it, wanted to taste the proof that he
could satisfy Yasusada too. 
And Yasusada came with a small curse. Not all the cum made it on Kashuu's
tongue, some of it spilling over down his chin and on his cheeks. Kashuu's
lolling tongue tried to swipe up the stray droplets, but he could only manage a
small noise of effort. Yasusada leaned over, wiping the remainder off his face
with his sleeve, slowly, so that it felt like Kashuu was being gently caressed.
Then, his now clean cheeks were being held by Yasusada's hands. Before he knew
it, his lips were softly claimed, and several deep, gentle kisses were pressed
to his open mouth again and again. The gesture was jarring after what just
happened, and Kashuu relished the slick, soft feel of Yasusada's tongue
soothing the inside of his mouth as long as he could.
When he did pull back though, Yasusada brushed Kashuu's bangs back, offering a
smile. "That felt really good, Kashuu. You're really amazing for enduring it.
I'm sorry for hurting you though. Ah, don't try and talk." So Kashuu didn't,
and he listened. Yasusada's smile grew a little in response, but its teasing
edge had returned. "Let me make you some tea now to soothe your throat. We can
think up an excuse to tell the others when they realize the chatterbox Kashuu
Kiyomitsu suddenly can't talk." He laughed, and Kashuu was ready to try and
summon enough strength to scowl, but in the end he was powerless to do anything
- including accepting Yasusada's unexpected hug. It enveloped his small, tired
body completely. So warm and soft. 
Kashuu lightly touched his throat, trying not to pout as he burrowed into
Yasusada's larger body.
Well. Yeah. Sometimes being small had its perks.
 
End Notes
     I'd like to issue a public apology to Kashuu's throat, RIFP. Deep
     throating is Serious Business kids, please take care of your throat
     when engaging in such scandalous activities, I mean it.
     There was originally gonna be more to this added but goddamn, this is
     already 4000+ words, like honestly that's a ridiculous length for
     this. Maybe later, if people turned out to have received this well, I
     might... Do more... The fic has this title for a reason (though
     "little" is probably inappropriate on more than one level).
     See me on twitter @fuwajellyfish for more sinning.
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