#dkbk a/b/o katsuki bakugou, a beta for all his life, is now on his...
zeein kacchanholic@prettyboykats
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May 18, 2026
~6 min read
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#dkbk a/b/o
katsuki bakugou, a beta for all his life, is now on his way to become an omega. he doesn't even know it's possible until he started dating izuku who just happened to be a prime alpha of all things. of fucking course.
"my omega~"
well shit.
he's been omegafied.
katsuki bakugou, a beta for all his life, is now on his way to become an omega. he doesn't even know it's possible until he started dating izuku who just happened to be a prime alpha of all things. of fucking course.
"my omega~"
well shit.
he's been omegafied.
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he'd be lying if he said he wasn't freaking out.
"A WHAT ???"
"WHAT DO YOU MEAN PUPS ?"
"JOIN YOU IN A WHAT DOING WHAT ???"
those were some of his first reactions. however instead of freaking out with him, the nerd explained to him rather calmly.
"A WHAT ???"
"WHAT DO YOU MEAN PUPS ?"
"JOIN YOU IN A WHAT DOING WHAT ???"
those were some of his first reactions. however instead of freaking out with him, the nerd explained to him rather calmly.
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he was too absorbed in his 'scientifically proven' rambles to realize how katsuki was losing his mind.
when they did began dating izuku never actually brought it up again though. atleast that's what katsuki thought.
when they did began dating izuku never actually brought it up again though. atleast that's what katsuki thought.
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dating izuku has been wonderful. katsuki would be lying if he said otherwise. waking up to izuku's calls and listening to the prime alpha's airy voice as he wishes him good morning sure as hell has been good.
"did you sleep well, baby ?"
katsuki wanted to blow up every time.
"did you sleep well, baby ?"
katsuki wanted to blow up every time.
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izuku is way too fucking good at this whole boyfriend thingy it's kind of pissing him off ! he thought dating a prime alpha would be challenge at first because he's never been /courted/. he knows nothing about the whole process but if it meant being pampered
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with love and gifts and attention and whatever izuku is doing then maybe, courting is not that bad ?
izuku would gives him his clothings, a deep purr rumbling from his chest whenever katsuki decided to wear them. he did learned that it was part of 'claiming ritual'.
izuku would gives him his clothings, a deep purr rumbling from his chest whenever katsuki decided to wear them. he did learned that it was part of 'claiming ritual'.
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a prime alpha is prone to be possessive, not like katsuki was surprised. he thought he'd be annoyed but honestly ? it never truly bothered him. that means izuku loves him so much right ? he's down bad ? isn't that good ?! that means he's the best !
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being constantly flooded with gifts and affections were nice too. izuku loves feeding him, touching him, kissing him, spending time with him, banter with him- they do all the lovely disgusting couple things just fine...until the omegafication is way too obvious to be ignored.
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izuku started marking him. he knows prime alpha is possessive, even more than regular alphas but he's sure was not ready for his entire neck and chest to be covered with marks. it became a routine for izuku to just lay him down and mark him as he will.
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"kacchan is mine, only mine ok ?" he'd remind him happily while hugging him tight, all happy and innocent as if bruises and his teeth marks is not everywhere all over him.
the damn nerd started insisting him to wear his stuff more frequently. he realized those were scented too.
the damn nerd started insisting him to wear his stuff more frequently. he realized those were scented too.
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other alphas would immediately back away the second they catched a whiff, recognizing it's from a prime alpha within seconds. nobody wanted to mess with that.
then here comes the /nest/. before katsuki knew it, his room has turned into one.
then here comes the /nest/. before katsuki knew it, his room has turned into one.
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izuku has been building one with all of their clothings, some of their friend's and also all might's. the rate of how big its becoming sure has been alarming. his whole room is practically a nest now !
true to his suspicion, izuku admitted it easily.
true to his suspicion, izuku admitted it easily.
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"oh my rut is near, we're spending it together right kacchan ?" he tilted his head innocently.
"uh..yea.." is all the beta gets to say. no fucking way he'd say no ??? izuku's puppy eyes will actually stab him on the inside !! the nerd seems genuinely excited,
"uh..yea.." is all the beta gets to say. no fucking way he'd say no ??? izuku's puppy eyes will actually stab him on the inside !! the nerd seems genuinely excited,
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his eyes were sparkling and he probably spent so much time to build a perfect nest for them. he probably has been thinking about it for months now that katsuki realized he never actually forgot about it. izuku..has been subtly treating him as his /omega/ isn't he ?
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so katsuki awkwardly tried to adjust himself to it.
izuku told him his rut is within three days, the only time left for him to mentally and physically prepare himself for a transition that will change the course of his life FOREVER.
izuku told him his rut is within three days, the only time left for him to mentally and physically prepare himself for a transition that will change the course of his life FOREVER.
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he's been reading so many websites and watches so many videos or listening to podcasts just to ready himself for it.
he needs to learn about knotting, about heats, about medical terms, about omega 101, about bearing pups— just EVERYTHING from scratch !
he needs to learn about knotting, about heats, about medical terms, about omega 101, about bearing pups— just EVERYTHING from scratch !
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he doesn't realize his sleeplessness started to actually show until izuku a
apologizes to him on the last day before his rut started.
"im so sorry kacchan. im so sorry..was i forcing you ? im sure i came across as such..and im sorry.. I didn't mean it !
apologizes to him on the last day before his rut started.
"im so sorry kacchan. im so sorry..was i forcing you ? im sure i came across as such..and im sorry.. I didn't mean it !
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kacchan doesn't have to do it if he's not ready !! kacchan don't even have to do it at all if that's what he wants ! i love kacchan, beta or omega I don't mind ! you don't have to change yourself okay ? im sorry that i kind of shoved you into it..i was not thinking-"
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"izuku"
"i didn't think much of how /kacchan/ feels at all ! I've been selfish oh my god-"
"wait izuk-"
"and i really just wanted to be with kacchan, no matter what shape what gender-"
"my alpha."
finally, the nerd halted his ramblings. he blinked like an idiot,
"i didn't think much of how /kacchan/ feels at all ! I've been selfish oh my god-"
"wait izuk-"
"and i really just wanted to be with kacchan, no matter what shape what gender-"
"my alpha."
finally, the nerd halted his ramblings. he blinked like an idiot,
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as if he couldn't believe what he just heard. the prime alpha swallowed thickly as katsuki's warm palm softly landed on the side of his face before he started caressing his freckled cheek.
"shut up already." the beta rolled his eyes while izuku stares at him like a lost puppy.
"shut up already." the beta rolled his eyes while izuku stares at him like a lost puppy.
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he nodded quickly when katsuki asked if he could speak now.
"you did.. overwhelmed me at first with all of these.." katsuki sighed, smiling fondly when izuku bit his lip and lets out what it sounds like a 'sorry' mewl a dog would after breaking something.
"you did.. overwhelmed me at first with all of these.." katsuki sighed, smiling fondly when izuku bit his lip and lets out what it sounds like a 'sorry' mewl a dog would after breaking something.
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"but i know you'll love me regardless, dumbass, because its you." the beta says confidently because he is. izuku has been treating him with nothing but respect and adoration all his life as a beta, what would've changed that ? izuku has been loving beta him unconditionally too.
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"i admit, im uh kinda scared but..i trust you to take care of me. i..want it too. i wanted to be your mate, i want to claim you as mine too. like hell I'd let you walk around being a mate-less prime fucking alpha out of all things !" he added, biting back a smile
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while the alpha shook his head as he chuckled. he looks so in awe.
"are you sure kacchan ?"
"have i ever not ? don't look down on me shitty nerd. omegafied me all you want, there's nothing I can't handle !" he says smugly, now comfortable as izuku pulled him closer.
"are you sure kacchan ?"
"have i ever not ? don't look down on me shitty nerd. omegafied me all you want, there's nothing I can't handle !" he says smugly, now comfortable as izuku pulled him closer.
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maybe it won't be as scary afterall.
"you sure is amazing kacchan !"
"damn right !!!"
katsuki says, before regretting the minute izuku enter his rut because he's a literal ANIMAL and all it took is /one/ crazy rut for him to fully become an omega by the next few weeks.
"you sure is amazing kacchan !"
"damn right !!!"
katsuki says, before regretting the minute izuku enter his rut because he's a literal ANIMAL and all it took is /one/ crazy rut for him to fully become an omega by the next few weeks.
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