Katsuki knows he's always been tough. He breaks ribs without...
Sapphire Midnight@SapMidnight
30 views
Aug 05, 2026
~9 min read
1
Katsuki knows he's always been tough. He breaks ribs without shedding a tear.
Izuku, in comparison, cries over stepping on an ant. It's dumb.
But after the war and graduation, a hint of water in green eyes sets off something in him. Something... protective.
#BKDK #BakuDeku
Izuku, in comparison, cries over stepping on an ant. It's dumb.
But after the war and graduation, a hint of water in green eyes sets off something in him. Something... protective.
#BKDK #BakuDeku
2
It starts off like every situation with Deku; him being a dumbass.
They're older now, and their fighting's more refined (saving the world does that to a hero), but the nerd is still reckless.
While protecting a group of kids from an attack, Izuku messes up one of his ankles.
They're older now, and their fighting's more refined (saving the world does that to a hero), but the nerd is still reckless.
While protecting a group of kids from an attack, Izuku messes up one of his ankles.
3
"How do you have such a strong quirk, and still can't walk?" Katsuki grumbles when dropping in front of Deku, who's sitting on the ground where he collapsed after the tough battle.
"Sorry, Kacchan." His apology comes with a wince. Katsuki picks up on how his lashes blink faster.
"Sorry, Kacchan." His apology comes with a wince. Katsuki picks up on how his lashes blink faster.
4
The sunset means the media around them won't get a good lighting on the freckled face, so only Katsuki sees the starting of big tears.
Normally, he teases Izuku for being a crybaby, but the little lip wobble and his wet eyelids makes Katsuki's heart clench.
Which is...weird.
Normally, he teases Izuku for being a crybaby, but the little lip wobble and his wet eyelids makes Katsuki's heart clench.
Which is...weird.
5
He also doesn't understand why his body moves without permission, his hands reaching out for the sniffling mess he calls his duo partner.
A heartbeat later, Katsuki has an armful of Izuku, cradling him like a baby, a pampered princess, or even a-
A bride. Like his bride.
A heartbeat later, Katsuki has an armful of Izuku, cradling him like a baby, a pampered princess, or even a-
A bride. Like his bride.
6
While alarm bells blare in his head, Izuku doesn't flinch away. His strong arms wrap around Katsuki's neck, and Deku's face is dry when it buries into his collar.
Like he trusts Katsuki to make the pain disappear.
He shuffles the nerd closer to his chest. "I've got ya, nerd."
Like he trusts Katsuki to make the pain disappear.
He shuffles the nerd closer to his chest. "I've got ya, nerd."
7
If he spends the night icing Izuku's ankle and yelling at him about elevation, its only for the two in Katsuki's apartment to know.
(And if, when Izuku falls asleep on his couch, he stares at freckled cheeks and glares after each skipped heartbeat, thats nobody's damn business)
(And if, when Izuku falls asleep on his couch, he stares at freckled cheeks and glares after each skipped heartbeat, thats nobody's damn business)
8
Katsuki almost forgets the strange reaction to Deku's waterworks until another run-in with shiny green eyes folds his will in half.
There's a party celebrating both his and Izuku's breaking into the top ten hero rankings.
Pink Cheeks and Raccoon Eyes gets the nerd drunk.
There's a party celebrating both his and Izuku's breaking into the top ten hero rankings.
Pink Cheeks and Raccoon Eyes gets the nerd drunk.
9
Izuku's kind on a regular day, but alcohol makes him far more vocal about his feelings.
"You're so pretty." Deku's splayed out on Shitty Hair's table, ignoring the loud music of the house party to beam up at Katsuki. "I like looking at you, Kacchan."
"You're shitfaced."
"You're so pretty." Deku's splayed out on Shitty Hair's table, ignoring the loud music of the house party to beam up at Katsuki. "I like looking at you, Kacchan."
"You're shitfaced."
10
Despite Katsuki's comment, Izuku giggles and reaches out, lets his fingers catch Katsuki's on the sticky table. "I'm so happy you don't hate me anymore."
He scrunches his brows, dislikes the taste in the back of his mouth. Because he doesn't know how to explain he never did.
He scrunches his brows, dislikes the taste in the back of his mouth. Because he doesn't know how to explain he never did.
11
His stomach rolls when the nerd's hand starts to tremble, his nose sniffling as the first sign of tears. "Then people kept trying to take you away from me. Why can't I ever keep you?"
They're at this drunk stage. Fantastic.
But while it pisses him off with others, with Deku...
They're at this drunk stage. Fantastic.
But while it pisses him off with others, with Deku...
12
"Oi." He ignores his disgust over the surface he drops his arm onto, chin sitting on the warm skin to stare Deku down. "I'm sitting right here with your drunk ass. Nobody's moving me unless I wanna go."
"Do you?" Izuku's hand clutches his tighter. "Do you want to leave me?"
"Do you?" Izuku's hand clutches his tighter. "Do you want to leave me?"
13
For some reason, Katsuki's throat dries out. He blames it on the dust that Rock For Brains doesn't clean. His mouth wants to snark out something insulting, but the wet lashes and reddened nose softens his words.
"Anywhere I go, you better be by my side. You got that, Nerd?"
"Anywhere I go, you better be by my side. You got that, Nerd?"
14
"Kay." With his cheek pressed on the table, the nerd's drunken smile looks stupid. "Then I'll never stop chasing after you."
Deku's words, which he knows the nerd won't remember tomorrow, have no right to make Katsuki's neck warm enough to force him look away. "Little stalker."
Deku's words, which he knows the nerd won't remember tomorrow, have no right to make Katsuki's neck warm enough to force him look away. "Little stalker."
15
The night changes Katsuki in ways he doesn't expect. He finds himself around Izuku more outside of work, demanding he go with Deku grocery shopping or help build a new shelf in the other's apartment.
The nerd seems happy hanging out with him. He even makes Katsuki a spare key.
The nerd seems happy hanging out with him. He even makes Katsuki a spare key.
16
But as the new dynamic grows, so does Katsuki's protective nature.
One time its because of his 'friends'.
Flat Face convinces Izuku to come with the Bakusquad to a haunted house. Katsuki knows Izuku doesn't do horror well.
Sure enough, Deku's in tears by the third jump-scare.
One time its because of his 'friends'.
Flat Face convinces Izuku to come with the Bakusquad to a haunted house. Katsuki knows Izuku doesn't do horror well.
Sure enough, Deku's in tears by the third jump-scare.
17
The whimper and pressing to his side is enough to snap Katsuki's guard dog persona into action.
With the hand in Izuku's hair guiding a teary face into his shoulder, he barks at any of the extras working to 'fuck off'.
He's pretty sure he makes the zombie pee with his glare.
With the hand in Izuku's hair guiding a teary face into his shoulder, he barks at any of the extras working to 'fuck off'.
He's pretty sure he makes the zombie pee with his glare.
18
By the time they get out of the 'evil cornfield', Izuku's forgotten all about the fear that caused his tears, seeming ready to fall asleep when nuzzling into Katsuki's steady frame.
Katsuki threatens to blast the next idiot from their group who makes kissey faces behind them.
Katsuki threatens to blast the next idiot from their group who makes kissey faces behind them.
19
If his pride takes a hit showing his protective side in front of them, he blows it to pieces when him and Deku are asked to do an interview on a late night show.
The hosts doesn't seem to know the meaning of the word 'private'. She asks questions charged with sexual undertones.
The hosts doesn't seem to know the meaning of the word 'private'. She asks questions charged with sexual undertones.
20
He has no problem shutting down her prodding about his sex life, because its nobody's business. Katsuki makes sure his eyes don't flicker to his left, unsure if the camera will catch his desire looking at Izuku.
But he forgets his own self-preservation when she digs at Deku.
But he forgets his own self-preservation when she digs at Deku.
21
"Wait, don't tell me you're still a virgin? You're so cute!" Despite her words, she smirks wide while leaning closer to the nerd. "You don't have anyone you'd give it away for? I bet there's lots of girls who'd help you out."
Izuku's stiff as a board next to him. "T-That's..."
Izuku's stiff as a board next to him. "T-That's..."
22
Katsuki narrows his gaze when the girl ignores his discomfort and winks at the camera. "We should host a little love show for our hero to find his future wife. How about it, Deku? What kind woman do you think about at night?"
All he needs is the damp edge of green eyes to react.
All he needs is the damp edge of green eyes to react.
23
"Back off, hag."
Katsuki sneers when he leans across the nerd's thighs to force her out of his space. He doesn't care how he looks posturing in front of his partner, hand curling on the cushion on Deku's opposite side.
Let the world see what happens when they make Izuku cry.
Katsuki sneers when he leans across the nerd's thighs to force her out of his space. He doesn't care how he looks posturing in front of his partner, hand curling on the cushion on Deku's opposite side.
Let the world see what happens when they make Izuku cry.
24
"K-Kacchan..." The whispered name and familiar hand on his back is all he needs to throw himself in front of the train to keep his nerd safe.
"Deku gives his life everyday with a smile that half of you jerks don't deserve. He's a hero, not a freak show for you to parade around."
"Deku gives his life everyday with a smile that half of you jerks don't deserve. He's a hero, not a freak show for you to parade around."
25
"Well..." The host looks caught off guard by his fierce tone, but recovers with her huff. "Someone's a little too protective of his duo partner. Any reason why?"
He doesn't think about his response. "Cause Deku's mine to take care of when he can't stand up for himself."
He doesn't think about his response. "Cause Deku's mine to take care of when he can't stand up for himself."
26
His 'claim' goes viral. Their friends send him clips and make bets on who will propose first.
His mom says she's 'proud of him', whatever that means.
Society mistakenly calls them the power couple. Like they're...together.
The only one who doesn't mention the show is Deku.
His mom says she's 'proud of him', whatever that means.
Society mistakenly calls them the power couple. Like they're...together.
The only one who doesn't mention the show is Deku.
27
At first, he tries not to think about it. But the more time that passes, the more he feels the nerd watching him when he doesn't think Katsuki's aware.
Except he always keeps tabs on Izuku, knows he has something to say.
So he waits. And waits.
Then forces the conversation.
Except he always keeps tabs on Izuku, knows he has something to say.
So he waits. And waits.
Then forces the conversation.
28
Not by choice. He says Deku's the sacrificial one, but he knows there's only one situation that makes him more selfless.
During a fight, Katsuki jumps in the way of an attack meant for Izuku's back.
There's a lot of blood, and he barely mutters 'Deku' before passing out.
During a fight, Katsuki jumps in the way of an attack meant for Izuku's back.
There's a lot of blood, and he barely mutters 'Deku' before passing out.
29
When he wakes up in the hospital, the first sight he sees is green hair laying on the bed.
Katsuki winces at the tear tracks on Deku's dirty face. How does he protect the idiot from crying when he's the cause?
He brushes the back of his hand along the cheek, which rouses him.
Katsuki winces at the tear tracks on Deku's dirty face. How does he protect the idiot from crying when he's the cause?
He brushes the back of his hand along the cheek, which rouses him.
30
"Kacchan?" It takes three slow blinks for Izuku's sleepy brain to catch up, quick to sit up. "You're-!"
"Not dead, idiot." He smoothes his thumb along darkened eye-bags. "Why you losing sleep over this, hah? We get hurt every week, ain't nothing-"
His thumb is wet in seconds.
"Not dead, idiot." He smoothes his thumb along darkened eye-bags. "Why you losing sleep over this, hah? We get hurt every week, ain't nothing-"
His thumb is wet in seconds.
31
"Ka-Kacc-" Izuku's palms press Katsuki's hand closer to his cheek, nuzzling the skin as he sobs.
"Oi, don't cry cause I'm alive," he says, misses the sharpness of the demand from his voice. Deku's tears softens any snark he attempts to use.
"I'm crying because you promised!"
"Oi, don't cry cause I'm alive," he says, misses the sharpness of the demand from his voice. Deku's tears softens any snark he attempts to use.
"I'm crying because you promised!"
32
"Hah?" Katsuki tried to remember any vow, but Izuku does it for him.
"You said you would never leave." Even though he hates Deku crying, he's pretty with shiny eyes and flushed cheeks. "I asked if you'd leave me, and you said we'd be side-by-side forever. I'm yours, aren't I?"
"You said you would never leave." Even though he hates Deku crying, he's pretty with shiny eyes and flushed cheeks. "I asked if you'd leave me, and you said we'd be side-by-side forever. I'm yours, aren't I?"
33
The drunk night mixes with his late night show declaration. He tries not to flush at the exposure. "Deku-"
"Then don't go places I can't follow you!" The next murmur presses to his palm, water pouring without shame down freckled cheeks. "Don't go where I can't love you back."
"Then don't go places I can't follow you!" The next murmur presses to his palm, water pouring without shame down freckled cheeks. "Don't go where I can't love you back."
34
Izuku's confession widens Katsuki's eyes, but he gathers himself when a broken noise fills his hospital room. Deku's sobs wrack his body, and he looks ready to fall apart.
"Come up here," he demands, doesn't care what the doctors will say later.
He needs Izuku in his arms.
"Come up here," he demands, doesn't care what the doctors will say later.
He needs Izuku in his arms.
35
Luckily, the nerd complies. Crawls up into the bed, is cautious where he lays until Katsuki rolls his eyes and yanks him onto his chest.
So what if it hurts? He'll heal.
"If you don't cut off the water works, I ain't kissing you." He still will, but Deku likes incentives.
So what if it hurts? He'll heal.
"If you don't cut off the water works, I ain't kissing you." He still will, but Deku likes incentives.
36
Sure enough, the crying stops quickly, his little lip wobble cuter than he has any right to be. "Kacchan..."
"I love a damn crybaby." But he grins when Deku sniffles his last tear back, then pulls Izuku down to kiss him better.
He has a feeling Izuku will cry a lot less, now.
"I love a damn crybaby." But he grins when Deku sniffles his last tear back, then pulls Izuku down to kiss him better.
He has a feeling Izuku will cry a lot less, now.
37
Wow this is long. But considering I thought of it 24 hrs ago, It came out well?
This is for @dekustwin as thanks for writing a lovely socmed au (everyone go check it out!) hope you like it, Bea!
If you enjoyed this, follow and check out my other work!
This is for @dekustwin as thanks for writing a lovely socmed au (everyone go check it out!) hope you like it, Bea!
If you enjoyed this, follow and check out my other work!
Sapphire Midnight@SapMidnight
Here is a Masterlist of my writing. It'll be mostly BKDK but I may have background couples or do other pairs in the future.
Please be warned that some will be 18+, so proceed with caution!
I'll add more as they come, so please enjoy 💚🧡
Please be warned that some will be 18+, so proceed with caution!
I'll add more as they come, so please enjoy 💚🧡