Thread by @wifedeku

#bkdk / #勝デ
cw: a/b/o, pregku, fluff, nsfw themes
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deku didn't mean to make kacchan so fixated on the date of their their baby's birth.

it'd just been a cute joke. they'd been pining after each other for years, and it'd all finally come out in a rather, ahem, explosive fight

ironically, it'd been valentines day. or maybe that was why the building tension had finally broke? because how many years had it been since they had been circling each other?

or rather, how long had izuku circled katsuki?

so, in a bid to finally give ochako's pitying

eyes a rest, izuku had resolved to not give Katsuki chocolate that year. no friends chocolate, no i'd-like-you-to-bend-me-over-the-nearest-surface-and-fill-me-like-a-creme-puff chocolate. no buying hero theme shaped chocolate molds, no more researching the tastiest sweet and

spicy fillings. no more tempering the really fancy chocolate chips that seized if you looked at it wrong! god, tempering chocolate really sucked. he was GLAD not to do it.

if izuku sulked and sat in his empty, CLEAN, kitchen floor for an hour that feb 13, nobody had to know.

after all, who would even notice. Kacchan? Kacchan never even looked at izuku's chocolates. izuku always tied his chocolates in garish bows and left them in katsuki's bag, but the blond had never once reacted when he'd seen them. just... ignored them and took out whatever it was

that he'd been reaching for.

maybe that was his way of being nice. waiting until izuku was out of eyeshot to chuck his chocolate away.

well, it'd turned out that izuku was wrong.

because while Kacchan had started off the day in a relatively good mood, it'd declined rapidly

as the day had gone on. even if he could hide his irritation, izuku was too attuned to his scent to be fooled. by the end of their shift, Kacchan smelled like burnt tires and cigarette ash.

"Which extra did you give them too, hah?!" Kacchan ambushed izuku as he left the changing

room.

cue the longest heat that izuku had ever experienced. apparently he'd only had mild heats so far because his omega had been convinced that his chosen mate didn't want him. now that the floodgates were open, his body overcompensated by pulling them into a frenzied state

that lasted two weeks

needless to say, they'd both forgotten about the chocolate by then.

so when he'd learnt that he was pregnant a few weeks later he'd held the tests in his hands and racked his brain, thinking of how to tell Kacchan, then remembered the valentines day fiasco

he'd put the test sticks in a slim box, wrapped it, and tied it with a bow. in a blank valentines day card (because ofc he still bought the supplies) he'd written

'a bit late for valentines, but just in time for christmas! here's your present, Kacchan ❤️

x'

it'd worked. Kacchan didn't cry often, but when he did it was heaving, and wet, and drippy. izuku smiled into his skull tank and teared up a little himself as he felt Kacchan's arms shake around him.

but...

once the waterworks were over, and all the really emotional conversations had been said, Kacchan suddenly became really obsessed with their baby's due date! by a stroke of luck the estimated due date really had ended up being december 25th.

it got so bad that Kacchan wouldn't let izuku go christmas shopping and buy him a christmas present, because 'the brat will be the best present, Deku.'

izuku's baffled. and a little exasperated. he asks, but Kacchan just huffs and leans his head against izuku's belly,

telling the pup that he'd better be on time, or else.

"you better not threaten our kid when he's out, you know," he scolds.

"look at my mom," Kacchan argues, "and i turned out fine. you have to parent with fear sometimes."

ok, izuku is gonna have to address that at some point.

what he doesn't know is that Kacchan had been stockpiling a small stash of christmas presents since the first year he'd started bullying izuku. it'd started off small, like kid sized gloves or a cheap all might action figure or keychain.

as the years had gone on and the chances of them ever having a good relationship had lessened, katsuki's presents had become less and less about gifting something to Deku, and more about his own tumultuous feelings about the nerd.

and so, somehow over the years he'd accumulated

a closet full of things that were way, way, wayyy too unhinged to be appropriate to give to your hero partner.

rare, limited edition, ultra expensive merch. and that was on the normal end. dynamight themed omega lingerie. courting collars. and the year before the valentines day

mishap... a ring.

when izuku had given him the card (a baby!! he was going to be a dad!), it was like everything suddenly hinged on the birth being on christmas. because it'd be a miracle.

he still wasn't sure about their relationship. they were having a kid, yes

and they were going to kill at being parents (look what they had for role models; hisashi notwithstanding).

but were they going to get married? were they going to be... mates? technically they'd only been together for a few months.

he didn't want to scare Deku away.

the uncertainty gnawed at him.

so it was like a fucking message from god or some shit. if the baby came on christmas, Katsuki could give the past presents in return. it'd be like... symbolic or some shit. instead of batshit insane, which really a part of him already knew this

plan was.

because he knew it was just an excuse. look, Katsuki was good at a lot of things. feelings are just not gonna be one of them, ok? thats why boundlessly kind and forgiving nerds like Deku existed in the first place, so that sad fuckers like him didn't end up feral

and tranquilized.

anyways, because the universe loves him and he's amazing (Deku says so!), the baby is born on christmas day, albeit in the very last second after a very long, harrowing birth.

where Katsuki waited, promising that he'd give izuku everything and more,

no babies or other excuses necessary. he just wants izuku to not be in pain anymore. he'll spoil to shit outta him, fuck.

izuku's passed out when Katsuki holds her for the first time, he stares into her hazy, blue eyes—the nurse assures him that's normal, and they can end up

anywhere from green to brown, considering their genetics—and wondering how he could have possibly used her as an excuse for his shortcomings. she was a whole goddamn person. both an amalgamation of them and something so much more. something that was just herself.

but he'd already gotten his dad to bring the contents of his closet, so izuku ends up opening them anyways. when he gets to the ring, he's having a full on bawl. it triggers the baby, and it takes a stern-faced nurse to get her back to sleep.

"yes," izuku mouths over her head.

Fuck, Katsuki thinks, trying not to cry because the nurse was really fucking terrifying.

Best Christmas ever.