For most of his life, Izuku doesn't see himself as a sexual person....
Sapphire Midnight@SapMidnight
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Aug 28, 2026
~11 min read
1
For most of his life, Izuku doesn't see himself as a sexual person. It's a weird topic he doesn't really have time to think about when he's busy fighting All For One and saving the world.
But even after graduation, and several partners, he... worries.
#BKDK #BakuDeku #SpicyBKDK
But even after graduation, and several partners, he... worries.
#BKDK #BakuDeku #SpicyBKDK
2
He knows that his most recent break-up is an immense blow to his already fragile ego.
The man's always been non-confrontational ("he's a fucking passive aggressive dick." "Kacchan..."), so the last thing he says feels like an AP shot.
'You sound so weird during sex, anyway.'
The man's always been non-confrontational ("he's a fucking passive aggressive dick." "Kacchan..."), so the last thing he says feels like an AP shot.
'You sound so weird during sex, anyway.'
3
It sends him into a tailspin after the guy leaves. He ends up getting emotionally drunk with his group of friends while watching cheesy TV dramas, and spills everything.
"I don't miss him," he admits, shoving lo-mein into his mouth. "I just... how can I sound weird during sex?"
"I don't miss him," he admits, shoving lo-mein into his mouth. "I just... how can I sound weird during sex?"
4
"You don't!" Ochaco says instantly, despite them never going further than kissing once in school. "Izuku, he was saying that to hurt you. You're probably amazing in bed."
"I thought weird was Midoriya's aesthetic?" Todoroki asks, looks around when their other friends shush him.
"I thought weird was Midoriya's aesthetic?" Todoroki asks, looks around when their other friends shush him.
5
Izuku groans and drops his head on bent knees. "Great. How do I fix noises I've never noticed before? Normally I'm in the moment and- nobody said anything!"
"Doesn't that mean it's not a normal pattern?"
Tsu shrugs at Iida's claim "Would you tell your partner if it was you?"
"Doesn't that mean it's not a normal pattern?"
Tsu shrugs at Iida's claim "Would you tell your partner if it was you?"
6
The silence from the whole group is enough to prove his ex's comment might not just be a petty jab. But it doesn't exactly disprove it, either.
More data's needed to sway him either way, but how does he even evaluate his sex noises?
Its not like he can ask someone...right?
More data's needed to sway him either way, but how does he even evaluate his sex noises?
Its not like he can ask someone...right?
7
There's too many things he'd have to consider. First off, it can't be a civilian, because they'd be too awestruck by his hero status to be honest.
Most of his friends are either in relationships, or not attracted to men. And he's not attracted to any that are.
Well, except-
Most of his friends are either in relationships, or not attracted to men. And he's not attracted to any that are.
Well, except-
8
Everyone knows his... feelings for a particular hot head. And sure, Kacchan would give a blunt, realistic judgement-
'No way' is his brain's instant thought, and he tries to shove the embarrassing thought to the deepest part of his mind.
Like fungus, the thought grows.
'No way' is his brain's instant thought, and he tries to shove the embarrassing thought to the deepest part of his mind.
Like fungus, the thought grows.
9
Because they've grown since the 'Tomura exposes Deku's big old crush for Kacchan on live TV' battle.
Kacchan shows this maturity by not making fun of Izuku's feelings or getting a restraining order on him. Izuku does his best to move on by dating other people he kinda likes.
Kacchan shows this maturity by not making fun of Izuku's feelings or getting a restraining order on him. Izuku does his best to move on by dating other people he kinda likes.
10
It's two weeks after the break-up that Izuku has a day off from work.
He doesn't plan it originally. Being on-duty helps forget his 'weird noises' and even weirder idea of asking Kacchan to...what would he even call that? Observation? Critiquing? Sex advice?
His cheeks flush.
He doesn't plan it originally. Being on-duty helps forget his 'weird noises' and even weirder idea of asking Kacchan to...what would he even call that? Observation? Critiquing? Sex advice?
His cheeks flush.
11
It's while he's tugging up the tight pants of his hero uniform over his thighs that his door opens, Izuku squeaking before he dives behind the couch.
He knows only one person has his spare key. "Kacchan! Why aren't you at work?"
"I am." The annoyed look says otherwise.
He knows only one person has his spare key. "Kacchan! Why aren't you at work?"
"I am." The annoyed look says otherwise.
12
"I don't understand," Izuku admits, since Kacchan's in sweatpants.
Kacchan stomps over and snags the sleepwear from before, throwing it back at Izuku. "Get that bunny costume off. You're benched for the day, and I'm making sure you actually take the day to rest your dumb ass."
Kacchan stomps over and snags the sleepwear from before, throwing it back at Izuku. "Get that bunny costume off. You're benched for the day, and I'm making sure you actually take the day to rest your dumb ass."
13
The idea of spending hours alone with Kacchan is normally a positive thing.
But with festering thoughts and avoidance of doing anything sexual to push down said thoughts, his heart squeezes in time with his dick's excited twitch.
"You don't have to..." He pauses at the glare.
But with festering thoughts and avoidance of doing anything sexual to push down said thoughts, his heart squeezes in time with his dick's excited twitch.
"You don't have to..." He pauses at the glare.
14
"Everyone knows the second I leave this apartment, you'll be out your damn window with your vigilante shit. So shut up and take your uniform off."
Goosebumps crawl up his spine at the order, and he really wishes Kacchan didn't look so amazing in his casual clothes. "O-Okay."
Goosebumps crawl up his spine at the order, and he really wishes Kacchan didn't look so amazing in his casual clothes. "O-Okay."
15
He rushes to switch his clothes to hide any weird reactions, but its only the start to his stressful 'day off'.
Izuku's terrible at hiding things from Kacchan (there's a reason he knew about One For All before everyone), and it never takes long for his friend to sniff him out.
Izuku's terrible at hiding things from Kacchan (there's a reason he knew about One For All before everyone), and it never takes long for his friend to sniff him out.
16
He feels the skeptical gaze on him while he eats the breakfast Kacchan makes. It grows more irritated when they hang out on Izuku's couch, watching old movies and new reels of heros in action.
Izuku wonders if its because he won't look at Kacchan, or how he can't stop squirming.
Izuku wonders if its because he won't look at Kacchan, or how he can't stop squirming.
17
His mind's creating scenarios of what will happen if he asks for Kacchan's sexual point of view.
The most plausible reaction is a face blast. Maybe he'll just get rejected with a few insults. There's a slim chance he might only get a weird look, or ignored for a week-
"Oi."
The most plausible reaction is a face blast. Maybe he'll just get rejected with a few insults. There's a slim chance he might only get a weird look, or ignored for a week-
"Oi."
18
Kacchan brings him out of his thoughts, and he fumbles to clutch the pillow over his lap to hide the growing erection. He's far too sensitive after avoiding his urges, and even the slight press of the fabric makes him want to rock forward.
"Um, y-yes?" He asks, swallowing.
"Um, y-yes?" He asks, swallowing.
19
The red eyes on him feels too good despite their irritation. "Why are you acting weirder than normal?"
"I don't know what you mean," He answers quickly, too far to be real.
Kacchan falls quiet for only a moment before he scoffs. "You're really that upset about your loser ex?"
"I don't know what you mean," He answers quickly, too far to be real.
Kacchan falls quiet for only a moment before he scoffs. "You're really that upset about your loser ex?"
20
"About my-" Eyes go wide when he realizes the thought is a good guess, but for the wrong reason. "I'm not sad about the breakup. You were right about us not being good together."
"Course I was, idiot. You never pick good people to date."
He knows it's probably self-sabotage.
"Course I was, idiot. You never pick good people to date."
He knows it's probably self-sabotage.
21
Instead of admitting that, he pulls his knees to his chest, the pillow falling to the side. "Kacchan's amazing."
"Obviously." Then Kacchan scowls, arms crossing. "So if ain't heartbreak, what's with all the extra shifts? You only do that shit when you're avoiding something."
"Obviously." Then Kacchan scowls, arms crossing. "So if ain't heartbreak, what's with all the extra shifts? You only do that shit when you're avoiding something."
22
Its nice his friend notices his habits, but it's a little inconvenient with the half-chub hidden between his thighs. "It's nothing important-"
"Then tell me, Nerd." is the instant response, and Izuku's always been weak to Kacchan's commanding tone.
"He just... said something."
"Then tell me, Nerd." is the instant response, and Izuku's always been weak to Kacchan's commanding tone.
"He just... said something."
23
"This a self-esteem thing again? Extras are gonna say whatever to make you feel like garbage. It's cause they're jealous."
"Thanks, Kacchan." Its sorta a compliment, and Izuku rides the good feeling into a confession. "It was more about... well, when we were intimate."
"Thanks, Kacchan." Its sorta a compliment, and Izuku rides the good feeling into a confession. "It was more about... well, when we were intimate."
24
"You suck at sex?"
The bluntness flushes him. "He didn't say bad. That'd be easier. He said I sound weird."
"Weird? The fuck's that mean?"
He shrugs. "Ochaco says I'm overthinking, and nobody before has said anything, but... it's hard to know what he meant by 'weird'."
The bluntness flushes him. "He didn't say bad. That'd be easier. He said I sound weird."
"Weird? The fuck's that mean?"
He shrugs. "Ochaco says I'm overthinking, and nobody before has said anything, but... it's hard to know what he meant by 'weird'."
25
Slowly, he looks back up, wonders if his darkest desires shine through his gaze from how Kacchan's narrows. "And since you're a nerd, you hate not understanding shit."
"It's fair to feel curious here. What if everyone feels uncomfortable, and they're all too nice to tell me?"
"It's fair to feel curious here. What if everyone feels uncomfortable, and they're all too nice to tell me?"
26
"Tch." Suddenly, Kacchan's moving, crawling across the couch and over him. Izuku squeaks and leans back, but there's only so much room for him to escape to.
"Kacchan-"
"Alright, show me." Izuku's confused noise makes Kacchan roll his eyes. "The noises. Lemme hear them."
"Kacchan-"
"Alright, show me." Izuku's confused noise makes Kacchan roll his eyes. "The noises. Lemme hear them."
27
"You want to hear me... having sex?" Even saying it makes his face steam.
Kacchan crinkles his nose. "Fuck no. I ain't gonna watch you with somebody else."
"Then how-" His mind catches up to the implication. "Oh! You mean like touch myself for you?"
"N-not FOR me, dumbass!"
Kacchan crinkles his nose. "Fuck no. I ain't gonna watch you with somebody else."
"Then how-" His mind catches up to the implication. "Oh! You mean like touch myself for you?"
"N-not FOR me, dumbass!"
28
"Ah, right. Not for you." Except it kinda is, and from how pink Kacchan's face gets after his soft agreement, both know it. "Um...should we move?"
"Just do it here."
"Here? With you..." Kacchan's perched over him, hands on either side of his head and hips between his thighs.
"Just do it here."
"Here? With you..." Kacchan's perched over him, hands on either side of his head and hips between his thighs.
29
When he gets a sharp nod, Izuku lets out a shaky breath, looking down at his own body's reaction to the situation. It's pretty obvious that interest in the situation won't be a problem.
"Ah, okay, then I'll..." Swallowing, he slips his hand down his stomach and into his boxers.
"Ah, okay, then I'll..." Swallowing, he slips his hand down his stomach and into his boxers.
30
The heat of the touch makes him gasp. He's unsure if its the length of avoidance, the taboo feel of the situation, or how close Kacchan's body is to his, that makes it feel so intense.
Maybe all three.
Either way, he shivers through his lip bite and starts moving his hand.
Maybe all three.
Either way, he shivers through his lip bite and starts moving his hand.
31
His hips squirm up, eager to rut into the too dry grip. He tries not to move, because it makes him knock into Kacchan's hips and thighs.
Izuku turns his head in shame at how the thought makes his pleasure spike. His breath pools on Kacchan's wrist. "A-Ah, sorry..."
"S'fine."
Izuku turns his head in shame at how the thought makes his pleasure spike. His breath pools on Kacchan's wrist. "A-Ah, sorry..."
"S'fine."
32
The quick mutter makes him peek up from the corner of his eye, body trembling at the focused glare watching him. He wishes he could part his legs wider, have a steady place to put his foot and thrust up.
For now, he only squirms under the watchful eye, melting into the sofa.
For now, he only squirms under the watchful eye, melting into the sofa.
33
The air gets heavier as he strokes himself under Kacchan's overwhelming frame, not touching but close enough to tease out his whimper. "Ka...cchan-"
His free hand covers his mouth. He doesn't mean to say the name, not even sure where it comes from.
But it feels so right.
His free hand covers his mouth. He doesn't mean to say the name, not even sure where it comes from.
But it feels so right.
34
Their first touch is Kacchan reaching out, grabbing the wrist and pinning it to the armrest above them. "Oi, don't do that. Need to hear you."
"Ri-right, for the-" His toes curl on the cushion when he collects wetness from his tip to stroke more. "The noises-ah."
"Yeah, sure."
"Ri-right, for the-" His toes curl on the cushion when he collects wetness from his tip to stroke more. "The noises-ah."
"Yeah, sure."
35
He doesn't have the brain bandwidth to process the dazed tone, Izuku panting out his next moan while arching his back. Its embarrassing to be so out of control in front of Kacchan, but everything feels more intense with him there.
Like a fantasy he can't believe is happening.
Like a fantasy he can't believe is happening.
36
The touch on his wrist tingles, like Kacchan has to hold back his quirk. And maybe he does normally muffle his noises with his palm, because the cries and pleas while pushing into his fist are too loud.
But Kacchan doesn't look annoyed or uncomfortable. The look he wears is...
But Kacchan doesn't look annoyed or uncomfortable. The look he wears is...
37
He feels like crying at how Kacchan pretty looks over him, flushed cheeks and dilated pupils. He's living erotica, brushing the inside of Izukus tense thighs when leaning close.
"What are you looking at, Nerd?"
"You, I-" He whimpers, lips aching. "Ka-Kacchan, how do I...sound?"
"What are you looking at, Nerd?"
"You, I-" He whimpers, lips aching. "Ka-Kacchan, how do I...sound?"
38
"Like you always do, Deku," except the tone isn't mocking or rude, but a heated murmur that tightens Izuku's stomach. "Always crying for me, like its your favorite word. You do that with your shitty exes, too?"
"Never them, not like-" A squeeze on his thigh tugs out a moan.
"Never them, not like-" A squeeze on his thigh tugs out a moan.
39
Having Kacchan's hands on him while he touches himself is too much to process. He leans his head back, keeps his lips open and spilling the name he's mocked for.
But from the hardness against the back of his thigh, Kacchan doesn't seem to mind. The revelation makes him whine.
But from the hardness against the back of his thigh, Kacchan doesn't seem to mind. The revelation makes him whine.
40
"Stupid extras making you think dumb things about yourself." A sharp nip next to his lips makes him gasp and chase the smirk pulling just out of reach. "Come on, make more noise for me."
He forgets what the plot is when he pleads. "Kacchan, please! Kiss me, wanna feel you."
He forgets what the plot is when he pleads. "Kacchan, please! Kiss me, wanna feel you."
41
Kacchan swears before he lurches forward, hips grinding into the hand still stroking his cock between them while swallowing Izuku's moan.
The kiss takes no prisoner, an attack while grabbing Izuku's hips to rut them harder together.
It's not sex, but he feels fully fucked.
The kiss takes no prisoner, an attack while grabbing Izuku's hips to rut them harder together.
It's not sex, but he feels fully fucked.
42
With the invisible line crossed, Izuku wraps his legs around Kacchan's waist, needs to feel their bodies meld together. Heat builds, need swelling between them like a tsumani.
And the loud cry of Kacchan's nickname while he comes seems to drag out the other's orgasm right after.
And the loud cry of Kacchan's nickname while he comes seems to drag out the other's orgasm right after.
43
Izuku doesn't know how long they kiss after their climaxes, uncaring of his little hitches of breath or weird noises between their mouths.
(and from how Kacchan drags him to the bed for a round two, he doesn't really care)
The original question does get answered...later.
(and from how Kacchan drags him to the bed for a round two, he doesn't really care)
The original question does get answered...later.
44
Months after the incident, he bumps into his ex. Covered in Kacchan's hickies and sweatshirt, its obvious they're together.
"Good for you. You always mumbled his nickname when you came. Don't think you even realized it. So weird..."
Izuku will take THAT truth to the grave.
"Good for you. You always mumbled his nickname when you came. Don't think you even realized it. So weird..."
Izuku will take THAT truth to the grave.
45
Sometimes the truth is in the orgasm.
Anyway, hope you enjoy this mess. They would get themselves into such a strange situation and somehow get a relationship out of it. Let me know what you think.
STM chapter out tonight after the gym! See you then!
Anyway, hope you enjoy this mess. They would get themselves into such a strange situation and somehow get a relationship out of it. Let me know what you think.
STM chapter out tonight after the gym! See you then!
Sapphire Midnight@SapMidnight
Alright, I am SUPER excited about this upcoming chapter for 'Sing To Me' and I promise, if you're not reading the story yet, now is the time to join!
Check out the sneak peek, and see y'all tomorrow 💚🧡
Catch up here:
archiveofourown.org/works/53311039
Check out the sneak peek, and see y'all tomorrow 💚🧡
Catch up here:
archiveofourown.org/works/53311039