Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/10720839.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      僕のヒーローアカデミア_|_Boku_no_Hero_Academia_|_My_Hero_Academia
  Relationship:
      Bakugou_Katsuki/Kirishima_Eijirou
  Additional Tags:
      Plot_What_Plot/Porn_Without_Plot, Porn_with_Feelings, Fluff_and_Smut,
      Swearing, mainly_lots_of_fucking_smut, Top_Bakugou_Katsuki, top_Bakugou,
      Bottom_Kirishima_Eijirou, Bottom_Kirishima, Rough_Sex, Biting, happy
      birthday_bakugou_and_me_lol, Birthday_Sex, First_Time
  Stats:
      Published: 2017-04-24 Words: 4161
****** The Heated Birthday Spar ******
by asiankittee
Summary
     Bakugou and Kirishima typically spar, and today wasn’t anything
     special.
     A/N: a completely self indulgent nsfw fic I wanted to write for my
     birthday since I share it with Bakugou. (a little late tho cause of
     editing and how much I wrote)
Notes
     2nd A/N: Honestly I haven't written a fic long enough for these two
     yet and I love these boys together so much. So this was really
     overdue.
They had been sparring. It was a typical activity the two did when they needed
to lose some steam, calm down, cure boredom, or simply because they needed to
hone in on their skills. It was a good practice and work out given that Bakugou
and Kirishima’s quirks parred well together; and pit against each other, it
almost seemed to cancel the other out. It was pure talent that determined who
would win their little matches. Now this spar session went like any other, with
Bakugou and Kirishima in their own world, pinned against each other as they
fought. They determined who won by who could get the other to the ground first.
It wasn’t simply just tossing someone to the ground, but the one who did so
would have to physically be holding the other down too. It was a great rule so
that any stumbles or such didn’t count and end their session.
It was going great in their secluded area as they tirelessly went at each
other, both sweating profusely from the exertion of their spar. Bakugou had
blasted himself upwards and Kirishima propelled himself from the ground to
meet. As they raised their fists to each other, suddenly Kirishima grabbed
Bakugou’s extended wrist – a flaw where Bakugou had not raised it yet from when
he had used the hand to push his blast down towards the ground – and he yanked
on him. They both went flying back to the ground, Bakugou first to hit before
Kirishima hit beside him. Once the dust cleared and the initial shock of their
landing, they scuffled, wrestling each other as the final moments of their spar
drew closer.
Kirishima came out on top, pinning Bakugou down as he straddled him and held
his arms down. Both of their chests rose and fell rapidly, some of Kirishima’s
hair flat from the sweat and strain of their fight. It framed his face
wonderfully. They stared at each other, bodies still alight with the
adrenaline, cheeks red. Bakugou stared up at Kirishima and all he could think
was Fuck. Kirishima had got him good and right now he looked like a fucking
angel.
“Gotcha,” Kirishima’s grin spread across his face, a bright, white, beaming
smile that shown down on Bakugou. As blinded as he was, he couldn’t look away.
Kirishima looked gorgeous. In that moment Bakugou was completely smitten with
his best friend, his partner, his sort of boyfriend (nothing had been said by
either parties and they hadn’t exactly discussed their relationship. They just
were.) Kirishima let go of his arms and sat back on Bakugou’s body as he
brought a hand up to wipe the sweat from his brow.
Fucking hell. Bakugou could feel the intense body heat of Kirishima right on
his lap and he was so fucking turned on. Kirishima was literally putting on an
unknowing tease show for Bakugou right now, who laid dumbfounded on the ground,
eyes up on Kirishima like glue. Kirishima pulled up the bottom of his tank to
wipe more sweat off his face. That was when he finally realized the undeniable
stare of Bakugou on him. Slowly he lowered his shirt, just enough to see the
blonde. They locked eyes and Kirishima realized Bakugou’s face was red now for
an entirely different reason, that his breathing was calm but bated.
“Like what you see?” Kirishima grinned, speaking from a sudden urge of
boldness.
“Yeah.”
Kirishima blinked, taken by surprise. He wasn’t expecting Bakugou to respond –
not verbally, maybe just a ‘che,’ a look away, and then a shove off of him. As
much as the redhead expected they were dating, they had never flirted boldly or
gone at things head first. It was always skirted around, taken with caution,
afraid of what might be said.
“You do?” Finally, he responded, he genuinely wanted to know.
“Che,” Bakugou tutted as he looked away – now that was the reaction Kirishima
expected – but then turned back to look up at Kirishima, his sweaty palms on
Kirishima’s knees, just below the cuffs of his shorts. “What?” He barked a bit,
fingers flexed nervously. “Can’t I like the way you look?” His voice was gruff.
Kirishima was surprised by the response, but a warm smile crossed his lips.
“Yeah,” His voice was more breathless than intended and he could feel the
shiver that ran through Bakugou’s body beneath him.
“Well good – cause I ain’t ganna stop looking.” He spoke in defiance even
though Kirishima had no qualms about it. A few minutes passed. Bakugou
swallowed hard and Kirishima stared down at him as he waited for the question
he could see stuck in his throat. Kirishima still had his shirt mostly raised
up. “…you…” He took another minute, those fingers struggling not to twitch
against his knees due to his nerves. “If you’re too hot… you should take off
your shirt.” Kirishima had never taken off an article of clothing as fast as he
did now. Bakugou seemed startled by how fast and compliant he had been.
Kirishima’s face heated up for a moment, embarrassed by his own enthusiasm.
“You suggested it.” Kirishima half pouted as he looked away. Bakugou squeezed
his kneecaps to get Kirishima to look back at him. When he did he noticed how
his eyebrows were drawn together in high concentration.
“Can I touch you?” Kirishima could die happy right now. Bakugou had never been
this direct before, and Kirishima was all for it. Kirishima nodded
enthusiastically. Bakugou smirked just a little bit, his own nerves eased by
Kirishima’s eagerness. Slowly his hands traveled over his shorts, up to the hem
and paused, before he suddenly slid his hands up his sides.
Kirishima let out a soft laugh, squirming atop of Bakugou at the brief ticklish
sensation. Bakugou smiled at the reaction and slowed his hands, slowly just
feeling over the skin. Sure, it was wet with sweat, but his hands were already
sweating profusely themselves. Bakugou found it amazing that Kirishima felt so
soft yet could harden in an instance. He glanced to his lap before they
followed his hands again. It wasn’t like the blonde hadn’t entertain the
thought of moving their relationship forward, or confronting what they were; it
was just comfortable the way they were. He didn’t feel they had to label
themselves for anybody because they were just always together, they were just
Bakugou and Kirishima.
Bakugou’s hands moved all over Kirishima’s torso and back, just enjoyed the way
he felt. His muscles were incredible, and he liked the little shifts he could
feel whenever he brushed against a ticklish spot, or a nipple. Bakugou was
living for Kirishima’s reactions, and doing his best not to get hard with every
squirm of his hips that pressed directly down onto his crotch. Kirishima soaked
up all the attention and when he felt Bakugou’s fingers prodding at his lips he
simply opened his mouth. Bakugou curiously felt at his sharp teeth before
Kirishima’s lips closed around his fingers and began to suck.
Bakugou’s breath hitched. He watched with wide eyes as Kirishima just go to
town on his fingers. What incredible sucking power…it’d go great right around
his – shit it was inevitable he was about to be hard. He glanced down at
Kirishima’s shorts, at the way he was sitting on his lap, and all he could
imagine was what Kirishima would look like in this position naked, against his
aching cock, moving up and down, riding him. As Kirishima sucked his fingers,
his other hand trailed down and took hold of Kirishima through his shorts.
The loudest moan left Kirishima. His hips jerked into Bakugou’s hand and down
against Bakugou. Bakugou groaned at the sensation and he jerked his hips up
into Kirishima, causing yet another moan to rack through Kirishima and against
his fingers. Kirishima was enjoying all the attention and sensations. His hips
moved down against Bakugou’s hand and lap, and sucked eagerly at his fingers.
Bakugou was enjoying everything as well. Kirishima looked so good and he
couldn’t stand lying down any more. He used his strength to sit upwards easily;
with all that taunting bare skin in front of him, he could hardly control
himself from assaulting Kirishima’s neck. Kirishima moaned around his fingers,
hands on Bakugou’s shoulders now to grip his shirt tightly.
By now both bodies were hard and hot for the other, desperate for more as they
began to frot against each other in earnest. This dance of theirs continued on
for who knows how long before finally Bakugou pulled his soaked fingers from
Kirishima and replaced them with his own tongue, pushing their lips together. A
heated make out session continued on. Bakugou grabbed at Kirishima’s ass simply
so he’d have more leverage to grind themselves together. However, ideas began
to form as his thumb played with the band of Kirishima’s shorts, his other
fingers still wet from his saliva. Bakugou pulled back to look at the
incredibly kiss-dazed Kirishima.
“Can I touch you?” He asked again, though his thoughts were down a much dirtier
path than the more innocent thoughts he had thought of before. Kirishima looked
down at Bakugou, his hands idly played with the hair on the back of his neck.
Bakugou watched Kirishima’s tongue slowly lick across his lips.
“Are you going to touch me more?” Kirishima asked, breathless from the sucking
and kissing he had just done. Bakugou nodded and was going to wait for a direct
answer in case Kirishima didn’t understand his words – though it’d be hard for
him to just say it into words if Kirishima asked for a more detailed
explanation. Kirishima regarded him slowly, simply to tease Bakugou. He leaned
closer, lips ghosted against his. “Are you going to fuck me?” He whispered, and
added a slow grind of his hips to the last words of his sentence. Bakugou
groaned, a shudder traveling through his body.
“Fucking hell – yes.” The hormones were raging wildly. Kirishima kissed Bakugou
deeply, drew out the longest kiss he could before he parted their lips again.
“Please,” Kirishima nodded his head and dove in for another kiss, hands now on
either side of his face. All nerves were gone now as Bakugou pushed his soaked
fingers down Kirishima’s shorts and rubbed them momentarily against his
entrance before he pushed a finger inside of him. Kirishima moaned into the
kiss, hips jerking and forcing Bakugou’s finger in a lot further than he
initially intended. The way Kirishima moved fueled Bakugou to move his finger,
to grind up against him, to enjoy every small sensation Kirishima was giving
him, including the small bites to his tongue.
They continued to make out, to grind, Bakugou fingering Kirishima and
increasing how much was inside. It was incredible the trust between them to do
something this intimate given the fact Bakugou was sure Kirishima could harden
his ass at any time, and Bakugou could easily spawn an explosion in just his
fingertips. They knew the other had complete control not to do so.
“Fuck,” Kirishima cursed, hips jerking down against his fingers. “That feels so
good.” He moaned, arms tightening around Bakugou’s neck as he rubbed his hips
down more. Bakugou growled, pleased, as he continued to make marks along the
other side of Kirishima’s neck. “Please,” Kirishima’s voice came out like a
whine. “I need more…please, can you–”
“Yeah,” Bakugou’s fingers left Kirishima in an instant and he continued to kiss
him as his hands fumbled with their clothes. Kirishima’s hands joined the
effort, working on getting Bakugou out of his shirt and then helping with the
undoing of their shorts. It took some maneuvering that neither wanted to do,
not wanting to leave the other’s body for too long or separate their lips.
Their boners bumped together as they finally got naked. They moaned and ground
against each other, Kirishima’s nails digging into Bakugou’s shoulders. Bakugou
didn’t mind because at least the guy wasn’t shoving hardened hands into his
back. Nails were nothing compared to Kirishima’s hardened state – not that
Bakugou couldn’t handle it.
His fingers found Kirishima again, pushing three fingers back in to do a final
stretch as Kirishima lifted his hips up. The blonde’s dick slid from its
original position against Kirishima’s dick, down past his balls and slid right
between his cheeks against his fingers. Bakugou groaned into their heated kiss,
nipped Kirishima’s bottom lip and tugged it as he pulled back, fingers leaving
his body. His tip rubbed and teased at Kirishima’s entrance; Bakugou entranced
with the way Kirishima moved his hips back against him, eager to take him in.
This would be their first time together… and suddenly he felt nervous.
This was their first time and he knew Kirishima was in a different realm than
he was with these sentimental things. Sure, it was special for him too but
Bakugou could easily fuck the brains out of Kirishima right here and now, right
after a good ass spar, out in the open where technically anyone could possibly
come across them. Kirishima…well…they hadn’t talked about this so he didn’t
know if Kirishima was just going with the flow and would look back on this
moment and regret it. He loved Kirishima too much to let that happen; and even
if he’d frustrate his libido so much he’d explode-kill himself, then so be it.
Anything for Kirishima.
“Kirishima,” Bakugou started but groaned as Kirishima kept grinding against his
dick like it was a stripper pole. “Kirishima–” He tried to speak but Kirishima
began to kiss him. Finally, he grabbed his hips to still him, taking a deep
breath through his nose. “Eijirou!” A shudder erupted from him before Kirishima
turned his luminous red eyes to him.
“Whaaaaaaaaaaaaaaat?” The inflections in his voice carried his whine of
frustration.
“Look at me babe,” Bakugou said seriously, his eyebrows furrowed together.
Kirishima finally calmed down enough to look at Bakugou seriously to take in
his words. “I… do…” He huffed in annoyance at his own inability to articulate
his words properly yet again. However, this time he forced it out. “Are you
sure?” He finally asked. “This… it’s our first time.” Bakugou looked at
Kirishima. “Are you okay with it being like this?” After all, this was hardly a
romantic location or anything of that nature if that’s what Kirishima wanted
their first time to be like.
Kirishima’s warm smile overwhelmed Bakugou as he then graced such the sweetest
kiss to his lips. “Yes, Bakugou.” The redhead pushed his fingers through
Bakugou’s hair. “Right now, you’re being so manly; being so considerate of me
when you’re dying of a boner.” He teased but he knew exactly what was on
Bakugou’s mind. The blonde loved that connection between them. How Kirishima
knew his train of thought or knew what he was trying to convey into words. “I
won’t regret it and I wouldn’t have it any other way.” He kissed Bakugou one
more time, slow and loving. “This is perfect…so, please…” Kirishima began to
move his hips against him. “Will you please hurry up?” Kirishima always knew
what to say to make Bakugou feel better and he grinned widely at his last
words.
“Is begging even manly?” He teased, but he was adjusting his grip on the
redhead’s hips, a hand on the base of his cock as he lined himself up.
“Of course it can be.” Kirishima argued back with a smile.
“You’re stupid.”
“Yet you still want me.” Bakugou couldn’t argue with that tease and he pushed
down on Kirishima’s hip to guide him down onto his cock at his own pace. Both
were brought to moans as Kirishima was slowly filled. It was a strange
sensation to be filled but Kirishima was already loving it. This was Bakugou,
this was their first time together – it was the best feeling in the world. When
he was seated fully on his lap, Bakugou was met with a wonderful squeeze around
his cock that had his hands sparking as he gripped Kirishima’s hips to keep the
guy from moving.
“Fuck.” Bakugou cursed and Kirishima relaxed his nails a little bit on his
shoulder blades. “You feel fucking amazing.” He growled low, forehead now
resting on his collar bones, trying to keep himself calm so he didn’t blast him
to bits in his excitement.
“You too.” Kirishima groaned out and leant down to kiss Bakugou’s ear. “So
good…I can feel everything about you. You feel like fire…so warm.” He spoke
low. It pleased Bakugou greatly to hear all of Kirishima’s thoughts right now.
“So perfect.” Bakugou was smiling now. He laughed a little and nipped his
collar bone as at last he lifted his head.
“You’re perfect Eijirou.” He spoke softly and kissed him before he began to
gyrate his hips. Kirishima moaned into the kiss, opening up so easily as
Bakugou explored his mouth with his tongue. When he pulled back he looked at
Kirishima with renewed spirit. “I’m going to make this unforgettable.” He
declared. Kirishima already thought it was, but what happened next just made it
even more so. Honestly, Bakugou was incredibly strong and dexterous to be able
to do what he did.
Without pulling out, Bakugou was able to stand up on his knees with his arms
supporting Kirishima up. He stood on his knees for a few moments while he
quickly grabbed at their clothes with one hand. He managed to form a makeshift
blanket before he set Kirishima’s back down onto it and he towered over him.
Kirishima was a little confused as he stared up at Bakugou, legs loosely over
the back of his legs, though he was mostly amazed at how easily Bakugou seemed
to have managed the stunt with minimal shifting of his cock inside Kirishima –
not that he hadn’t liked the small shifting that had occurred. The blonde
leaned down, a forearm on one side of Kirishima’s head so he wasn’t putting all
his weight on Kirishima and his other hand gripped his hip. He leaned down to
his ear, a shit eating grin on his face.
“I’m ganna fuck you good –” The rough, deep voice was a voice that’d give him
infinite wet dreams in the future and in the moment gave Kirishima shivers.
Before he could even respond or think, “– so you better hold tight, babe.”
Bakugou’s first abrupt thrust reached him. A strangled moan left him and his
hands immediately took purchase on Bakugou, holding him close as his legs
wrapped around his waist. The pace was simply brutal and didn’t give Kirishima
a chance to pause at all. The blonde was thrusting like a piston, and abusing
every sensitive area he could find inside of the redhead. Kirishima was left a
moaning puddle of goo who could only hold onto Bakugou as he fucked the living
daylights out of him. Most likely he was screaming his moans too, but neither
gave a flying fuck. It was just them in this beautiful moment.
Bakugou pounded into Kirishima, panted and groaned as he listened to the
beautiful music Kirishima was making beside his ear. By now Kirishima’s hair
was completely deflated and it look gorgeous, flowing out around his head like
a fiery halo. Bakugou lifted his head to look down at Kirishima and the face he
was making. Drool was sliding from the side of his mouth and he was the picture
of absolute bliss and pleasure with his eyes closed. It almost seemed like they
had rolled back. Fucking hell it made Bakugou twitch in more excitement,
growling as he leant down to bite bright red kiss marks along his collar bone.
It felt so good, moving in and out of Kirishima at such a pace, and Kirishima’s
sounds just spurred his hips on rougher.
Everything about it was rough, the way Bakugou thrusted, the way he drilled
into Kirishima with such unrelenting vigor – no ordinary person would be able
to take it. Thankfully Kirishima wasn’t ordinary and could handle it. “I love
you.” Bakugou spilled out of nowhere as he thrusted harder. Kirishima cried out
louder suddenly, nails clawing at his back. It seemed like Bakugou had brushed
against a really good spot.
“B-Bakugou! Ba—aaaahhh—kugou!” Kirishima began to speak utter nonsense but a
few words were clear. “Close – Katsuki – need – love… too – fuck!” Kirishima
was beginning to whine in his moans as he clung to him, getting close to his
impending climax. “So close, I need it, fuck me harder, fuck me, fuck me, fuck
me,” Kirishima chanted and Bakugou continued on harder, digging his knees and
sneakers further into the dirt as he grabbed both of his hips now and pounded
the ever living fuck out of Kirishima. Muscles bulged and veins shown at the
immense strength he displayed at Kirishima’s request.
“Katsuki!” Kirishima cried out as with little warning spurts of white erupted
from his cock. Tears flowed at the overwhelming stimulation as Bakugou
continued to thrust through the heated contractions squeezing around his cock.
Just a little more…just a little—
“Fuck—Eijirou!” It came out as a deep possessive growl as Bakugou pushed all
the way inside, making Kirishima scream out as he came. Each little spurt made
him stutter his hips, holding Kirishima captive with his grip. Both made little
grunts and groans until Bakugou was completely spent inside of him. Bakugou was
stubborn and didn’t let the fatigue or glow make him collapse onto Kirishima.
He looked down at the mess that was Kirishima as they both caught their breath.
The image in front of him made him truly think he was a devil that just
tarnished a beautiful angel. Kirishima finally managed to open his eyes, tear
stains running down the side of his face, and he smiled up at Bakugou.
“Wow.” He said, laughing softly. Bakugou smiled back and nodded, laughing
slightly.
“You’re a mess.”
“I bet I’m a hot mess,” Kirishima grinned, teeth bright and showing.
“Yeah,”
“You’re a hot mess.” Kirishima smiled and reached up to touch Bakugou’s cheek
and Bakugou covered his hand with his own, holding it. “You look incredibly
sexy… so strong too.” Bakugou just let Kirishima talk, shutting his eyes while
Kirishima’s thumb caressed his cheek warmly. “It was wonderful…and I’m so full
of you. Until I clean myself up…and out… I’ll still be filled with something of
yours.” Kirishima was speaking such filthy words but they turned Bakugou on and
just rubbed him in all the right ways. It was no surprise that Bakugou could be
pretty possessive given his explosive nature. “It feels good.” Bakugou opened
his eyes to look down at Kirishima.
“Good.” As much as he wanted to stay and relax and just stay inside of
Kirishima, “We should get back…and get you cleaned up some.” Plus, he knew they
were both exhausted and it’d be best not to sleep out in the open like this,
especially with all the screaming that had taken place. It was sure to attract
someone to check it out now that it had stopped. Kirishima whined but agreed.
Bakugou pulled out and they focused on getting their clothes on. Once dressed
Bakugou ended up having to help dress Kirishima and piggy back carry Kirishima
cause of his jello legs from the rough fucking. Bakugou acted annoyed but was
satisfied he had been the cause of Kirishima’s current state. On the way back
to Bakugou’s room Kirishima complained about how he could feel his cum sliding
out of his ass and that he would have to get up super early to wash his clothes
before anybody else could get to the washing machines. Bakugou pretended to
scoff.
Once in his room they showered to get themselves all cleaned up, where Bakugou
complained about the stinging from the intense clawing his back had received
and Kirishima complained on cleaning himself out which Bakugou ended up
assisting him with. Afterwards they settled in Bakugou’s bed to cuddle naked.
He securely held his arms around Kirishima and Kirishima held him tight around
his middle. He hummed softly, pleased with their development and pleased with
how forward Bakugou had been that day.
“Happy birthday Katsuki,” Kirishima spoke softly, yawning as exhaustion tugged
at him. He felt extremely spoiled even though it was Bakugou’s birthday.
“Yeah, yeah,” Bakugou pushed his hand into his hair, enjoying the soft red
strands between his fingers. “…I’m glad I have you Eijirou…” Bakugou whispered
as he nuzzled his face into his hair, taking a deep breath in as he relaxed.
Kirishima smiled, feeling all warm and fuzzy at Bakugou’s words before he fell
asleep. Bakugou quickly joined him, pleased with the events of the day. All
they had wanted to do was engage in a simple spar on Bakugou’s birthday, but
who would have guessed it would lead to sex and such a deep, meaningful
development in their relationship.
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