From the moment Katsuki meets the arrogant idiot named Monoma, he...
Sapphire Midnight@SapMidnight
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May 26, 2025
~11 min read
1
From the moment Katsuki meets the arrogant idiot named Monoma, he knows the guy is a jerk.
At first, he barely pays attention to him. Katsuki only cares about those he thinks will be number one.
But then the moron goes and watches him die. (BakuDeku, Baku/Mono friendship)
At first, he barely pays attention to him. Katsuki only cares about those he thinks will be number one.
But then the moron goes and watches him die. (BakuDeku, Baku/Mono friendship)
2
Katsuki doesn't know about this at first after the war. The plan sort of went up in flames the second Deku gets snatched up by Fangs, so he doesn't really know what other parts of it still fall into place.
Creepy Hands sure packs a hell of a punch even without his quirk, so...
Creepy Hands sure packs a hell of a punch even without his quirk, so...
3
He only picks up on something being different when the copy cat starts showing up at his hospital room after the war.
Katsuki's unsure WHY he's there. It's like the weirdo just wants to come by to see he's not run-off before he brags about being 'in one piece' and leaves.
Katsuki's unsure WHY he's there. It's like the weirdo just wants to come by to see he's not run-off before he brags about being 'in one piece' and leaves.
4
It's not until Hobo comes in that it's smacked into his head.
"Monoma watched you die." The words make him twitch against his bedding, his teacher not holding back. "The only way he could hold Shigaraki back was keeping his eyes open. Which means he couldn't look away from you."
"Monoma watched you die." The words make him twitch against his bedding, his teacher not holding back. "The only way he could hold Shigaraki back was keeping his eyes open. Which means he couldn't look away from you."
5
"I came back," Katsuki says, Caterpillar giving him an arched eyebrow.
"If you watched Midoriya die, and he came back, would you be okay?"
"That's fucking different."
"Why?" Katsuki clams up, and the Hobo nods like he understands. "It's different, but still traumatising."
"If you watched Midoriya die, and he came back, would you be okay?"
"That's fucking different."
"Why?" Katsuki clams up, and the Hobo nods like he understands. "It's different, but still traumatising."
6
Part of the consequences of dying is losing some of his stubborn anger. Katsuki gets over his irritation regarding Monoma's visits pretty quickly.
It's actually a bit easier to have someone that he doesn't have a history with to talk to. No burdens or shame on his shoulders.
It's actually a bit easier to have someone that he doesn't have a history with to talk to. No burdens or shame on his shoulders.
7
And after looking past Copy Cat's false bravado, he's not the worst person to have around. He’s quick with his insults, smart enough to pick out people's weaknesses, and never seems to settle on his quirk's boundaries.
But he's so damn nosey, worse than Pinky or Round Cheeks.
But he's so damn nosey, worse than Pinky or Round Cheeks.
8
"Are those two dating?" Parrot scrunches his nose while staring at Shitty Hair and Pinky.
Katsuki scoffs, stuffing a bite of his salad in his mouth before he shrugs with his good shoulder. "Fuck if I know."
"Their flirting is awful, a gruesome eyesore."
"Then stop looking."
Katsuki scoffs, stuffing a bite of his salad in his mouth before he shrugs with his good shoulder. "Fuck if I know."
"Their flirting is awful, a gruesome eyesore."
"Then stop looking."
9
"It's almost as bad as those two." Loud Mouth nods to Sparky, who is watching Ears talk about something with a dopey look on his face. "Your class can face the worst villains in the world, but become cowards about silly crushes? These are the heroes of the future? Pathetic."
10
"Because you're drowning in love," Katsuki snarks back, though does find it funny to hear someone call out his oblivious classmates.
Copy Cat waves him off. "I choose to only share my greatness with those who earn it."
"Talking real big for a guy who wears a tie unironically."
Copy Cat waves him off. "I choose to only share my greatness with those who earn it."
"Talking real big for a guy who wears a tie unironically."
11
"Fashion is a gift, not something I can teach a peasant." Katsuki scoffs into his food, but smirks despite the insult. Parrot's got some balls, he'll give him that.
His extras accept Monoma, though struggle to understand. But how does he explain his death teethers them together?
His extras accept Monoma, though struggle to understand. But how does he explain his death teethers them together?
12
The nerd's reaction to Parrot is really weird. He is normally better at hiding his feelings (at least with most, though Kacchan sees through him every time), and doesn't show his discomfort with others.
But something about Loud Mouth's presence brings out a new side of Izuku.
But something about Loud Mouth's presence brings out a new side of Izuku.
13
"Ah." Deku halts mid step into Katsuki's room when seeing Copy Cat laid out on the floor, complaining over doing homework. Katsuki lifts his head just in time to see the streak of something darker in Izuku's face before it rushes away. "I'm sorry, I didn't know you were busy."
14
"Like he'd ever be too busy for you, chosen one." As if he enjoys the tension, Parrot pushes up onto his elbows and grins mockingly at Deku. "And the world knows YOU'RE wrapped around his pretty finger."
Katsuki scowls when Izuku tenses, feeling like he's missing the punchline.
Katsuki scowls when Izuku tenses, feeling like he's missing the punchline.
15
The nerd looks behind him, backing up toward the door. "I should go."
"What?" Not willing to lose some time to hang out with the nerd (which he's not going to explore), Katsuki sweeps his foot off the bed and kicks Loud Mouth. "Oi, get out of here and go bother Tumbleweed."
"What?" Not willing to lose some time to hang out with the nerd (which he's not going to explore), Katsuki sweeps his foot off the bed and kicks Loud Mouth. "Oi, get out of here and go bother Tumbleweed."
16
"Rude." He shows how much he cares over the accusation by rolling his eyes, watching Copy Cat dust off his stupid outfit after pushing to his feet. As he moves toward the door, he sends a look to Izuku that also feels like a missed story on his side.
There's a history there.
There's a history there.
17
Katsuki waits until his annoying new extra leaves before he glances to Izuku, who looks at the floor with a distant stare. "Hey."
Izuku jerks his head up, eyes wide like he's seeing a ghost. A few blinks clears up the look. "Ah, sorry. Guess I'm a little tired from training."
Izuku jerks his head up, eyes wide like he's seeing a ghost. A few blinks clears up the look. "Ah, sorry. Guess I'm a little tired from training."
18
Katsuki doesn't believe that, but he lets it go for now. He's got two options for getting the answers he wants, and he thinks Loud Mouth will be an easier nut to crack.
He spends some time silently watching the interactions between the two, trying to pick up on their dynamic.
He spends some time silently watching the interactions between the two, trying to pick up on their dynamic.
19
It's not like Loud Mouth really bullies Izuku the way he does with everyone else in his class. Which is strange, because Izuku’s one of the easiest targets to tease.
But the looks, which hold some secret knowledge, make the nerd squirm in a way he hasn't since middle school.
But the looks, which hold some secret knowledge, make the nerd squirm in a way he hasn't since middle school.
20
"What's your deal with Deku?" he finally asks one night, when the two are working on cleaning the kitchen. Katsuki's arm is still shot, so he bribes Copy Cat with food to help him make the place presentable.
"What, you worried I'm going to take your boy toy?" The idiot cackles.
"What, you worried I'm going to take your boy toy?" The idiot cackles.
21
Ignoring the heat in his face, Katsuki scowls at him. "You're dumber than I thought. I'm not dating Izuku."
"Wow, really? What's a guy have to do to be good enough for you? I mean, he's grown a quirk and totally killed a man for you-"
"What the hell are you talking about?"
"Wow, really? What's a guy have to do to be good enough for you? I mean, he's grown a quirk and totally killed a man for you-"
"What the hell are you talking about?"
22
Parrot laughs again, but his coy demeanor seems to fade away when Katsuki doesn't lose his confused look. True surprise crosses Monoma's face, but a somber look takes over soon after.
The last time Katsuki's seen it was their first interaction in the hospital.
"You don't know."
The last time Katsuki's seen it was their first interaction in the hospital.
"You don't know."
23
"I swear to God, I'll blow your fucking head off if you don't stop speaking in riddles," Katsuki threatens, losing any patience. His heart's beating like crazy, as if he's in the middle of battle, but only Loud Mouth is standing in front of him.
"Nobody showed you the video?"
"Nobody showed you the video?"
24
The question’s tone leads Katsuki to abandon his cleaning goal, grabbing Loud Mouth by his ear and dragging him to Shitty Hair's unlocked laptop.
"Pull it up," is his demand, shoving the hand on his good arm into his pants pocket as Copy Cat mutters insults and starts typing.
"Pull it up," is his demand, shoving the hand on his good arm into his pants pocket as Copy Cat mutters insults and starts typing.
25
It only takes him a few moments for a shaky video to pop up. It's shot from above the battle that Katsuki only remembers parts of, since he was dead for half of it.
Now he sees the way Deku shows up, the relief of 'making it' before seeing the carnage that Creepy Hands left.
Now he sees the way Deku shows up, the relief of 'making it' before seeing the carnage that Creepy Hands left.
26
And it's strange, seeing his motionless, bloody body on the battlefield. Despite being alive again, and the threat being gone, Katsuki still grabs his chest to check his heartbeat.
But when he sees Izuku's wide eyes, his silent scream, and the way Blackwhip contorts with malice-
But when he sees Izuku's wide eyes, his silent scream, and the way Blackwhip contorts with malice-
27
He's never seen the quirk look so... menacing before.
"Of course you haven't." Loud Mouth's comment makes Katsuki realize he's picked up the nerd's terrible habit of speaking his thoughts out loud. "Every time he becomes this monster, it's cause you're in some sort of danger."
"Of course you haven't." Loud Mouth's comment makes Katsuki realize he's picked up the nerd's terrible habit of speaking his thoughts out loud. "Every time he becomes this monster, it's cause you're in some sort of danger."
28
"It's happened more than once?" He wants to call bullshit, because he knows Deku better than anyone else. If it'd happened before, why didn't he know?
"Ugh, you two are stupid." Parrot sighs, then tugs on his tie like he's annoyed. "Before the battle, Aizawa warned me of this."
"Ugh, you two are stupid." Parrot sighs, then tugs on his tie like he's annoyed. "Before the battle, Aizawa warned me of this."
29
"What do you mean?"
"When we were planning, he told me all the surprises to be aware of on the battlefield." After brushing off his collar, Copy Cat turns toward him. "He said he knew Shigaraki would try to target you at one point, after seeing how badly Deku reacted in Jaku."
"When we were planning, he told me all the surprises to be aware of on the battlefield." After brushing off his collar, Copy Cat turns toward him. "He said he knew Shigaraki would try to target you at one point, after seeing how badly Deku reacted in Jaku."
30
Katsuki isn't sure how many more 'plot twists' he can handle, but his talkative extra goes again. "Shigaraki hurt lots of people that day. Deku's mentor, the top hero, Aizawa... but it was only when he stabbed you, and mocked your sacrifice, that all this creepy stuff came out."
31
Katsuki touches his shoulder, remembering the searing pain of the dark blades piercing into his body. If people asked, Shigaraki's first attempt at killing him hurt more, since the heart explosion happened in an instant.
"What the hell," he whispers, looking back at the screen.
"What the hell," he whispers, looking back at the screen.
32
Of course, Loud Mouth can't stand not being the center of attention, so he shifts the focus. "I mean, really you should be thanking ME for discovering this. If I hadn't prodded him about you during our training session, he might not ever have gotten this ability. You're welcome."
33
"I want to blow your smug face up." But he needs him for information. "You're sure it was me that triggered it?"
"I know how to get under someone's skin," Copy Cat says with too much pride. "I took one look at his adoration of you and knew you were his world before even he did."
"I know how to get under someone's skin," Copy Cat says with too much pride. "I took one look at his adoration of you and knew you were his world before even he did."
34
Katsuki's hand fists against his chest, teeth clenching. "Does he know?"
But he doesn't need the answer, the flashback of their conversation with All Might filling his brain.
When they asked if he knew what triggered Blackwhip, Izuku cut himself off.
He HID it from Katsuki.
But he doesn't need the answer, the flashback of their conversation with All Might filling his brain.
When they asked if he knew what triggered Blackwhip, Izuku cut himself off.
He HID it from Katsuki.
35
"For what it's worth," Parrot casually lays out on the couch like he's a king. "I figured you knew already and were secretly dating."
"Why would you assume that?"
"Because you died for him, and he killed for you." Loud Mouth rolls his eyes. "Two sides of one freaky coin."
"Why would you assume that?"
"Because you died for him, and he killed for you." Loud Mouth rolls his eyes. "Two sides of one freaky coin."
36
Katsuki stares at him, trying to find a way to counter the blunt summary. But, isn't that really the truth?
He and Izuku are entwined, and no matter how many times one of them tries severing their threads, they're always stitched together again.
Even death doesn’t stop them.
He and Izuku are entwined, and no matter how many times one of them tries severing their threads, they're always stitched together again.
Even death doesn’t stop them.
37
Footsteps enter the room. Katsuki lifts his head, catches Izuku's soft gaze and growing smile when their eyes meet.
But when he glances at the video on the laptop, Izuku freezes. Katsuki sees the dark emotion from before clearer now.
It's fear of Katsuki discovering the truth.
But when he glances at the video on the laptop, Izuku freezes. Katsuki sees the dark emotion from before clearer now.
It's fear of Katsuki discovering the truth.
38
"I was... r-running out to get dinner." He doubts that’s true, since the nerd's wearing pjs. "I'll just leave you two-"
"No." Annoyed that he's so far behind, Katsuki moves across the room, snatching Deku's bicep before he can scamper away. "No more running from this, Izuku."
"No." Annoyed that he's so far behind, Katsuki moves across the room, snatching Deku's bicep before he can scamper away. "No more running from this, Izuku."
39
"Kacchan, please," Izuku begs, making himself small like in middle school. He looks terrified of what Katsuki will do with the knowledge. "One For All's almost gone now. We don't have to make a big deal of this."
"What if I want to?"
"Huh?" Izuku snaps his head up, confused.
"What if I want to?"
"Huh?" Izuku snaps his head up, confused.
40
Their stare lingers in silence until Copy Cat groans from the couch, pushing off the seat to dramatically slink away.
"I'm not going to sit here and third wheel this death-happy couple. Wait to kiss until I'm out of the room. Only you two would think this is romantic. Weirdos."
"I'm not going to sit here and third wheel this death-happy couple. Wait to kiss until I'm out of the room. Only you two would think this is romantic. Weirdos."
41
Katsuki glares at him until the idiot disappears out of sight, then returns his attention to a flushed Izuku.
There's a lot they need to talk about. He hates that even now, Izuku feels he has to hide feelings from Katsuki.
But maybe he hasn't been exactly honest, either.
There's a lot they need to talk about. He hates that even now, Izuku feels he has to hide feelings from Katsuki.
But maybe he hasn't been exactly honest, either.
42
Katsuki takes a slow breath, steps close enough for their chests to brush. Izuku has to tilt his head back to keep eye contact. Katsuki uses that to his advantage, taking a big chance.
"If I trigger one quirk when I'm dying, do you think another one will go off if I kiss you?"
"If I trigger one quirk when I'm dying, do you think another one will go off if I kiss you?"
43
Izuku blinks, then blinks again. It's cute how dumbstruck he looks. Though he doesn't speak (the crux of their damn problems) the hand that grabs Katsuki's shirt to pull him closer says everything his lips don't.
Which is fine; Katsuki needs those for something else, anyway.
Which is fine; Katsuki needs those for something else, anyway.
44
That night, Katsuki learns alot.
About Deku's Blackwhip, and 'controlling his heart'.
That he owes Parrot a face blast for the shit he said before.
How float DOES kick in if Katsuki flusters the nerd enough.
But most of all, he learns how good Izuku's lips taste against his.
About Deku's Blackwhip, and 'controlling his heart'.
That he owes Parrot a face blast for the shit he said before.
How float DOES kick in if Katsuki flusters the nerd enough.
But most of all, he learns how good Izuku's lips taste against his.
45
Monoma, the cupid the world never expected to need. I just feel someone like him would pick up on dynamics SO fast because of his need to needle people.
I hope you enjoyed! If you're looking for something spicer, check out the bff big bro series:
I hope you enjoyed! If you're looking for something spicer, check out the bff big bro series:
Sapphire Midnight@SapMidnight
Here is where you can find the 'BFF's Big Brother' story!
This story will be in Izuku's POV
There will be between 8-10 parts(don't hold me to this). This story will have spicy content.
This story will be in Izuku's POV
There will be between 8-10 parts(don't hold me to this). This story will have spicy content.
