Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/12394539.
  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
  Character:
      Bakugou_Katsuki, Kirishima_Eijirou, Kaminari_Denki, Ashido_Mina
  Additional Tags:
      Fluff_and_Smut, Mild_Hurt/Comfort, First_Time, Dom/sub, Leashes, Bakugou
      Katsuki_Swears_A_Lot, Explicit_Sexual_Content, Consensual_Underage_Sex,
      First_Time_Blow_Jobs, First_Time_Bottoming, First_Time_Topping, First
      Time_for_Everything_Fest, Kirishima's_birthday, Birthday_Sex, Let's_go_to
      hell, I_Will_Go_Down_With_This_Ship, There_is_sex_in_here, They_are
      minors, Kirishima_is_too_good_for_this_world, Bakugou_is_an_ass, But
      Kirishima_sees_through_him..._to_his_less_asshole_side, Basically, he's
      an_angel, Homo_slur_(just_a_minor_one), They_are_awkward_but_they're
      trying, bless_them
  Stats:
      Published: 2017-10-17 Words: 3211
****** Happy birthday, Shark week. ******
by Shaa
Summary
     Bakugou is an idiot and doesn't know how to show his feelings, but
     Kirishima is an angel who wants to lose his virginity to this
     asshole.
Notes
     First time posting here, sorry if the format is shit.
     I didn't come up with F-bomb for Bakugou. I read it somewhere else,
     but that wasn't the original source either. Lmk if you know.
     I've always called Kiri shark week, sorry if you do, also.
     This is very explicit, they are not aged up. If that's not your
     thing, move along please.
     Kirishima is the best.
     This was pretty much an excuse to write some more Bakushima smut.
     Add me on Tumblr! BethanyShaa
Kirishima made his way into the common room. Today was his birthday and he was
very excited as he bound into the kitchen and saw all of his friends standing
around a big stack of pancakes with a candle in the middle of them.
"Happy Birthday Kirishima!!" They all said in unison. Denki raised his hands up
and a confetti popper rained down on the small group.
Denki, Mina, Midoriya, Iida, Ururaka, Sero, Jirou, Todoroki....
Kirishima was naming off everyone in his mind, looking for someone in
particular, but he wasn't there.

"Man, you guys are the best!" Kirishima said authentically, and ran over to
give everyone a hug; Sero pulled out a chair for him and slapped a birthday hat
around his head.
"Yeah, we are, aren't we?" Mina winked and handed Kirishima a fork. "And I hope
you're ready, because after breakfast we're going to take you skating!" She
nudged Kirishima and everyone slowly made their way to the couches, just
chatting and watching TV. Mina sat down beside Kirishima at the table.
"Hey what's wrong? You usually devour pancakes, you feeling alright?"
Kirishima nodded his head. He didn't want to seem ungrateful.
"Of course! Everything looks great, thank you guys!" And he dug in.
Why isn't Bakugou here?
It's not that Kirishima expected him to be here for the party necessarily (he
wasn't really into crowds) but it was very unlike him to not be at the coffee
pot already.
Kirishima's heart flip flopped. It had been a week since "the incident". He and
Bakugou had been sparring, and Kirishima may have let it slip that he liked
Bakugou. He had been afraid their friendship would end, honestly, but Bakugou
hadn't made any comment about it- he had just helped Kirishima up and
everything stayed as normal. He still made the coffee in the mornings for
everyone (no one else could make it "right"), he still had come by to tutor
Kirishima the day after, and he even still "talked" to him in their secret code
by knocking on each other's wall.

So what's different about today?

Kirishima finished off his pancakes, and Mina whisked the plate away to put in
the sink before he could stand up.
"Fuck, you people are loud." Bakugou had wandered into the kitchen, hood pulled
over his head, bee lining for the coffee.
Kirishima straightened up in his chair.
Mina was still at the sink.
"You're late, Katsuki!" And she punched him playfully in the arm.
He shrugged his shoulder, the coffee started pouring into the pot.
"Too early for this shit." He mumbled under his breath.
"Well, I hope you're coming skating with us, at least!"
"Well, sorry to disappoint you," he poured coffee into his mug, "I'm not into
that gay shit." And he turned on his heels and headed back for the stairs.
"Kirishima... What's wrong?" Mina looked puzzled.
Kirishima didn't notice when it started, but he had tears trickling quietly out
of his eyes, down his cheeks, splashing on to the table.
He hastily wiped his eyes.
"I'm just happy to have you guys." It wasn't a lie, after all.
" 'M gonna go shower." He ducked out of the room and up the stairs.
"Is everything ok?" Sero stood up, everyone in the rooms' eyes had trailed
after Kirishima.
"I'm not sure, I guess..?" Mina poured some coffee. Sero shrugged and went back
to his conversation with Denki.
Kirishima let the hot water numb his body.
That gay shit. That was definitely a jab at me, right?
His chest clenched tight.
"Why didn't he just turn me down, instead of bottling it up like that." He was
still crying, his tears disappearing into the tap that poured down his face. He
hit his fist against the wall, and startled. He was pretty sure he heard a
knock on his door at the same time. He perked his ears up.

Knock knock.

It wasn't the door, he heard a few more taps on his wall. Bakugou was asking if
he was in his room.
Kirishima turned the water off, grabbed his bath robe and ran to the wall that
joined their room. He was dripping water everywhere, his hand was at the wall,
but he hesitated his reply. Another loud bang came from the opposite side.
Kirishima lightly tapped.
He heard his phone buzz on the counter.
--F-bomb--:
You in there?
Kirishima crinkled his nose up. Of course he was.
--Shark Week--:
Obviously.
Knock knock.
This time it was at the door.
Kirishima scratched his head, but walked over and opened the door anyway.
"Put some fucking clothes on before you let people in." Bakugou pushed his
hands into the pouch on his hoodie, darting his eyes to the floor.
A blush rose up in Kirishima's cheeks. He hadn't realized he was in his robe,
and his face was still streaked with snot and tears too.
"Sorry." He mumbled, not really sure why he was the one apologizing.
"You gotta have clothes on to go skating anyway, dipshit." He pushed past
Kirishima and went to sit on his bed.
"I don't know if I feel like going." Kirishima picked up his sweat pants from
the floor and put them on.
"Why the fuck not?" Bakugou looked annoyed, "And what the hell are you crying
about? It's your birthday isn't it?" Bakugou pulled out a small box from where
his hands had been hidden and held it out to Kirishima.
Kirishima raised his eyebrow.
Bakugou jabbed the box at the air toward Kirishima, he reached out and took it.

"Well? Open it already." Kirishima noted a small blush across Bakugou's nose.
"It's not going to blow up is it?" Kirishima couldn't help but laugh as he
shook the box.
"Fuck you, no! Just give me that!" Bakugou snatched the box back from his hand,
threw the lid across the room and pulled out a small, spiked chain.
"I didn't really know what to get you, but I thought this looked like you so."
His face was really red now, and Kirishima was confused.
"A choker?"
Bakugou glared at Kirishima.
"Look, I've never bought a present for a boyfriend before." His cheeks burned,
but he held Kirishima's eyes with his.
"Ok..but.. I'm confused." Kirishima anxiously twisted his hands together, "I
had thought you turned me down last week so..." He trailed off.
"Why would you think that? I never said no."

It was true, and he had acted like nothing had happened, but that had made
Kirishima sure he was just interested in being friends.
"A choker?" Kirishima repeated, and he giggled a little bit.
"Well ya, so everyone would know you were mine." He moved off the bed and was
behind Kirishima putting the chain around his neck before he could refuse.
Kirishima's heart fluttered as he felt Bakugou being as gentle as he's ever
been.
"I um... " His hands moved up to feel the small spikes now adorning his neck.
"It's very manly, thanks." He fiddled with it, Bakugou tugged his robe to get
him to turn around.
"It looks good on you, shitty hair." Bakugou blushed and planted a quick kiss
on Kirishima's cheek.

Kirishima started crying again, the same silent tears as earlier.
"Why the fuck are you crying again?" Bakugou tried to look annoyed, but
Kirishima saw concern mingled in his eyes.
Kirishima shook his head. "I'm just happy. Thanks for the necklace and the
other thing."
"You're pathetic, crying over your birthday so much.. "
Kirishima threw his arms around Bakugou's neck and pressed his face into his
shoulder.
"Look, I've never been in a relationship before so.. " it was hard for Bakugou
to speak so candidly, "so sorry if I do stupid shit." It was almost too much
for him, he had to force the words out, but he felt some relief as Kirishima
melted into his chest.
"I know you're an idiot, you don't have to warn me." Kirishima pulled his head
back.
"Can I give you a kiss?" Kirishima smiled.
"You don't have to fucking ask, shitty hair..." Bakugou blushed brightly,
wrapping his arms around Kirishima and pushing his lips on to the other.
"Mmm." Kirishima sighed and opened his mouth a little. Bakugou pulled away. "I
said I've never done this shit before."
"Nervous? That's not like you." Kirishima cocked his eyebrow at Bakugou.
"Fuck you." But he couldn't deny it, he was nervous. Bakugou reached into his
pocket and pulled out another chain, a leash. It took a second before
Kirishima...
"Oh!" His eyes were wide. "Only you'd be too scared to kiss someone, but bold
enough to show them a leash." Kirishima couldn't help it, he laughed and sat
back down on the bed.
"You know.. you hurt my feelings downstairs."
Bakugou felt like an ass, still holding the leash up. He threw it on the bed.
"What are you talking about?" He sat beside Kirishima.
Kirishima swallowed hard and faced Bakugou.
"When you said, you weren't into 'that gay shit', I thought you were directing
it at me since you hadn't mentioned my confession yet."
Bakugou's mind raced, "What the f...oh ya. I was fucking tired. And...I don't
know how to skate so.."
"A homo slur, though, really? Wasn't it you who just gave me a dog collar?"
Honestly it was so perplexing to Kirishima.
"I didn't mean it like that, shark week."
He saw Kirishima's eyes pleading at him.
"Look, I'll try not to do it again. I can't promise I won't, but I'll try ok.."
Kirishima knew that he meant it. He reached behind him and held up the leash,
Bakugou blushed.
"Seriously are you into this kind of thing?"
Bakugou grabbed the leash.
"Shut up. I've never tried it, but I think so..." His eyes drifted down to the
spike choker on Kirishima's neck, he gulped.
Kirishima smiled, and held his head back a little, presenting his neck.
"Go ahead, then."
"You this easy, 'Shima?" He asked, starting to feel a little brave.
"Well, I've never been in this situation before either, but I think so.. for
you anyway." His face was burning red. He knew he was saying some embarrassing
things, but he'd had a huge crush on Bakugou since he first came to UA, and
he'd be lying if he said he hadn't daydreamed about Bakugou being the
dominating type. Bakugou reached out and put the leash onto Kirishima's choker,
"Fucking right you are." Bakugou tugged at the chain, Kirishima gasped.
"Well..." Bakugou rolled the chain in his hand and slid off the side of the
bed, "it's your birthday so I thought I could do something for you.. if you
wanted." And he gestured toward Kirishima's crotch. Kirishima gulped and
nodded.
"Yes I want to." He was blushing very red, he bit his lip and tasted the
metallic iron of blood, but he could already feel his sweat pants getting tight
as he saw the hunger in Bakugou's eyes. He leaned up and sucked the bubble of
blood off Kirishima's lip, licking his lips as he pulled away.
"Take your pants off, then." Bakugou tugged Kirishima's leash. He whimpered and
tucked his fingers into his waistband, pulling them down to his ankles. He
hadn't put on boxers, and his cock sprung out readily. Bakugou licked his lips,
"You are a horny slut." Kirishima blushed.
"Only for you." He breathed.
Bakugou leaned down and flicked his tongue on the throbbing member.
"Nnng..." Kirishima shut his eyes and pressed his head against the wall.
Bakugou tugged the leash. "That won't do."
Kirishima peeked through his eyes, questioningly.
"I want you to look at me, and call me Katsuki."
Kirishima's face reddened, "Ok, Katsuki." And Bakugou gripped Kirishima in his
hand and jerked a few times, running his thumb over the tip of his cock,
spreading the precum on his shaft like lube.
"Nnng.. Katsuki.. that feels so.." he couldn't help it, his head fell back
against the wall.

Bakugou waited until he had relaxed, mouth open, low moans sliding off his
tongue, then he removed his hand and quickly replaced it with his mouth, taking
Kirishima fully in his mouth. Kirishima gasped and his eyes shot open,
"Katsuki.... ahhh..." He watched as the blond took him, felt him squeeze his
thighs to spread his legs further. Somehow the slight pain felt amazing. He
knew it was his first time, but he did it so well. And he was gorgeous, too,
bobbing up and down like that. Kirishima was trying very hard not to move his
hips too much, he didn't want to gag his boyfriend. Bakugou had his mouth at
the base of Kirishima's cock, his tongue was sliding up and down the shaft, and
he was sucking his cheeks in slightly.
"Mmmm.. Katsu... I'm g.." but it was too late. Kirishima had bucked his hips up
and shot his cum out into Bakugou's mouth. His eyes were heavy as he saw
Bakugou lean up, and his Adam's apple moved up and back down. He had swallowed.
Kirishima's first thought was "Fuck that was hot.", but it was quickly replaced
with terror.
"I'm sorry, I tried to hold it in but I couldn't!" His face got red again, but
Bakugou was looking at him hungrily, he still hadn't gotten off.
He crawled back on to the bed, forcing his mouth onto Kirishima's. He tasted
the small cut come open again, and moaned into Kiri's mouth, thrusting his
tongue in. Kirishima sighed and melted into Bakugou. He had dreamed of kissing
Bakugou like this for so long. He bathed in Bakugou's raspy moans leaking from
his mouth, the smell of his sweat, the weight of his body against his chest.
Kirishima shakily reached up to fumble with the button on Bakugou's pants.
Bakugou tried to make enough room between them so it'd be easier, but he didn't
want to stop assaulting Kirishima's mouth. Kirishima managed to get the button,
and Bakugou twisted his hips to help him remove them.
"Oh- oh!" Bakugou pulled away, Kirishima was blushing. Bakugou hadn't worn
underwear, either.
"Pretty confident in yourself, huh?" Kirishima grinned. Bakugou leaned in to
Kirishima's ear,
"I was hopeful but.. I was going to go back and jack it myself if you hadn't
wanted to." and he leaned down to bite and kiss Kirishima's neck.
Kirishima thought that was sweet. Any hint of softness from Bakugou was sweet,
and it made Kirishima's heart swell. He pushed Bakugou's chest and he pulled
away, eyes heavy,
"What is it?" Bakugou asked. Kirishima looked at him. He was muscular, chest
heaving slightly, his hair was matted in sweaty clumps on his forehead and his
cock..
Kirishima jerked his eyes back up. He held out the leash to Bakugou, who took
it but tilted his head to the side, confusion clouding his thoughts.
"I just thought..if you wanted to, maybe we could..." Kirishima blushed and
played with the sheet.
"We could...what?" Bakugou really was confused, he couldn't think about
anything except cumming on Kirishima's chest.
Kirishima turned and got on all 4s, shaking his butt up at Bakugou.
"Are you sure you want to?" Bakugou really wanted to, but he needed to know his
boyfriend was ready.
"If it's you, it's ok.. I belong to you now, remember." Kirishima pointed at
his necklace, "And you can use that, too." He indicated the leash.
Bakugou bit his lip and moaned, "Fuck, Eijirou, you... " And he put a finger
into his mouth. It was his first time, but he'd seen enough porn to know he'd
have to loosen Kirishima up first. He popped his finger out of his mouth and
rubbed it over Kirishima's hole. Kirishima pushed his hips back, "Mmm.. please,
Katsuki?"
Bakugou slipped his finger into Kirishima, he liked it.
Kirishima bit down on the sheets and mumbled, "Just do it, Katsu, please I..."
But he bit down again as Bakugou slid in another finger and pumped them a few
times. He rubbed his other hand on Kirishima's side, admiring his figure.
"Damn, Eijirou, you look amazing." He let his fingers fall out, and he lined
himself up behind Kirishima.
"Are you ready?"
Kirishima nodded. Bakugou tugged the leash, put a palm on the small of
Kirishima's back, and carefully lined the head of his cock up to his hole.
Kirishima moaned and that was all Bakugou needed, he pressed on Kirishima's
back, pulled the leash a little tighter and thrust the head of his cock through
the ring of muscle. Kirishima gasped and rocked back, pushing his hips back,
closing the gap between him and Bakugou.
"Fuck, Eijirou, you feel so good." Bakugou threw his head back and pumped back
and forth, slowly, he was already losing his mind. He tugged on the leash.
"Look at me you idiot."
Kirishima turned to look up at Bakugou. He looked so amazing thrusting at him
like that, that desperate look in his eyes, moaning Kirishima's name.
Kirishima closed his eyes and breathed out, "Katsuki, I love you."
He didn't know why, but that sent him over the edge. "Mm fuck" and he drilled
into Kirishima one last time, leaning over to wrap his arms around his waist to
ride out his orgasm. Kirishima felt the hot liquid fill up inside him, and
Bakugou slid off his back onto the bed beside him.
"Fuck you, shark week. You can't say you love me like that when I couldn't say
it back." Bakugou blushed, Kirishima carded his hand through his blond hair.
"You've got plenty of time for that. Remember?" He tapped his necklace and put
his forehead against his boyfriend's. Kirishima wasn't going to mention this
whole ordeal only lasted about seven minutes; he had came pretty fast, too.
Bakugou put his palm on Kirishima's cheek and kissed him.
"I do love you, idiot. And happy birthday."
Knock knock.
Kirishima jumped and got off the bed, putting his bath robe back on and hastily
pulled his sweat pants on, too, as he felt Bakugou's liquid creep down his
thighs. He opened the door just enough to stick his head out. It was Mina.
"Just seeing if you were coming down... We're all waiting on you." She pointed
at Kirishima's neck, "What's that?"
Kirishima blushed and reached up to undo the leash, throwing it behind him.
"Just a birthday present." He nodded and smiled as she stood there, eyebrows
creased.
"Sure..just... 10 minutes." She walked away.
"Well, that was embarrassing." He looked over at Bakugou. "You sure you aren't
coming?"
"Mmmm ya, I'll wait here for you to get back."
"Suit yourself." Kirishima busied himself with cleaning up and putting on some
clothes, he didn't want his friends waiting much longer.
"Bye, I'll see you soon, Katsuki!" Kirishima smiled, his hand on his door knob.
Bakugou looked over and didn't want to admit how much he actually liked that
stupid grin Kirishima always had.
"Wear your necklace." Was all he managed to say.
"Don't worry, I'll tell everyone you got it for me." He flashed his teeth and
shut the door.
Bakugou leaned back in Kirishima's bed, put a pillow over his face and breathed
his boyfriend's scent in deeply. He was going to have fun here waiting.
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