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Kirishima was a 6 foot 8 inch pro hero, non pro body builder, and mated omega. Weighing in at a heaping nunyabuisness the young man was absolutely massive for an omega, which to a point was necessary for his career. Being a pro hero meant doing everything within your power to help others and with a quirk the effectively made him a shield it didn't really make sense to stay small.
To a certain extent he was rather proud of his bulk. Omegas in general had a hard time building up muscle and while omega men weren't quite as bad off as omega women it still wasn't easy. But his genetic background of big boned people combined with is love of testing his physical limits gave him a bit of an advantage.
The problem of course was that omegas were expected to be petite. And while there was sometimes a bit of pride that came with the shock of someone realizing he did all that he did with what was normally considered a handicap, there was really only so many times a guy could take “There's no way you're really an omega.” before he started to feel like maybe he shouldn't be one.
There was technically hormone therapy to get ones secondary gender changed, but even in his darkest hours he knew in his heart that wasn't for him. He liked being an omega, loved that he could give off soothing pheromones, gain the trust of others with ease, and adored submitting to his boyfriend. Bakugou was a wonderful alpha, who also loved being an alpha, and though he may have been a bit of a toxic alpha when they were kids, the both of them had grown so much together it was kind of hard to imagine life with out the other. Bakugou never made Kirishima feel lesser for his non-traditional features, in fact he made damn sure his omega knew he loved him for everything that he was.
Bakugou was a 5 foot 11 inch, prohero, non pro bastard (so dubbed by Kaminari) and mated Alpha. The blonde had been one of those obvious presenters, the only real trouble of his secondary gender came with figuring out how his demi-sexuality played with his ruts. Of course there had been the problem of him using his status to assume superiority over others, being a beautiful alpha with a good quirk and a natural talent for most things could really get to a teenagers head.
He thanked the powers that be for the underserved blessing on his life that was Kirishima. Kirishima who didn't seem to give a fuck about power, status, or gender, who wasn't afraid to fight for or against him.
The first time Kirishima had ever seemed to even think about secondary gender was when they graduated. He'd bulked up in his third year and by the time they were moving in together he had to buy entirely new cloths. If Bakugou got hard instantly watching his boyfriends muscles rip through a pair of jeans that was his business. It was also probably the grace of a higher power that kept him from being on sight when the first person made Kirishima feel to big to be an omega, because no amount of personal growth and deep breathing would keep Bakugou from chewing the shit out of anyone who dared to imply his mate was anything less than perfect.
Still no amount of aggressively cherishing would kill the seed that had been planted, and from then on any comment only fed into the new insecurity.
Fat Gum or Toyomitsu Taishiro was an 8 foot 2 inch pro hero, non pro baker and unofficial dad of 32 amazing children, of which Kirishima was one. Weighing in at a grand total of “just enough” he knew exactly what it felt like when the world seemed dead set on convincing you that you were just to big to be an omega. He was old enough now that it didn't really bother him – though if he had some late nights where he remembered that he was 40 and hadn't had a serious relationship since he went pro that was his business – but his heart really went out to his kids. Tamaki got it bad enough for just being tall, though he was still very lean, but the day Kirishima came to visit with that hesitant troubled look in his eye he knew he had to do something.
Of course there was no changing body type, Kirishima had been confident enough in himself to not want that anyway, but luckily after years of hearing the exact same thing Toyomitsu knew what Kirishima needed.
It was early in the day, Toyo had a night shift but Kirishima was off all day and had messaged him saying he wanted to catch up, that he really just needed to talk to a good friend. He hadn't said much beyond that but the moment he walked in to FatGum's office the older omega knew something wasn't right.
“Howdy kiddo, what did you wanna talk about?” He tried, voice as casual as he could manage.
“Oh, I mean nothing specific, I just missed ya is all.” Kirishima was smiling but his shoulders were in-turned. Toyomitsu left if alone for awhile and they talked back and forth, shooting shit and catching up on each others lives, Kirishima slowly seemed to relax more and more. Finally his easy expression shifted and he muttered, “Hey can I ask for some advice?”
“Buddy if old farts like me couldn't give advice we wouldn't be good for nuthin.” Kirishima laughed at that.
“Toyo you're only 40.”
“Hey 40's older than dirty compared to a spring chicken like yaself.”
“I just.... How do you have such confidence in yourself?” Toyomitsu raised an eyebrow, he knew Kirishima had quirk confidence issues when he was a kid but he thought he'd long since gotten over those.
“What do ya mean kiddo?”
“Just... with your... body...” He waited patiently for Kirishima to find his words. “And... your.... gender....” The second part came out as an almost shameful whisper that went off like a fire alarm in his head.
Slamming his hands down on his desk Toyo marched his way over to his stammering son and scooped him up like a sack of potatoes. Kirishima the too big omega was absolutely dwarfed in FatGums arms. The bigger omega began swinging him around and Kirishima couldn't help the laughter that bubbled out of him.
“Toyo what are you doing?”
“Sorry what was that? I couldn't hear you all the way down there?” Toyo had been in Kirishimas exact situation so many times growing up, and for all the worth of actual advice there had been so many times where he wished his elders had just held him. When your inner omega is crying you snuggle that sucker. And that's exactly what he did squeezing Kirishima as tight as he could with out actually absorbing him, talking over his giggling. “You listen to me little buddy, you are a cute ass omega, your muscles? Cute! Your chizzled jaw? Adorable! Anyone to dares to tell you what you should or shouldn't look like ain't worth their salt!”
Suddenly Kirishima wrapped his arms back around Toyo, still laughing as he squeezed back. “Thanks Fat.” They spent the rest of the hang out with Kirishima sitting in Toyomitsus lap like a kid telling Santa he'd been good, and when the time finally came for Kirishima to leave his shoulders were much straighter.
“Hey kiddo before you go,” He called out as Kirishima stood up to leave, quickly slipping off his jacket and handing it to the other. “Take this and remember what your old man Fat told you ya'hear?”“Dude are you sure?”
“Kid I got more spares than I know what to do with. You'd be doin me a favor.” Even if that wasn't true he'd gladly give up his last hero jacket for the way his sons face broke into a blinding grin. Suddenly he really did feel like Santa. “Now get your butt home and eat something!” Kirishima nodded and gave him one last plus ultra hug before departing.
~~~
Later that night Bakugou trudged through the door, hissing to himself as he pealed his sweaty boots off his feet, most of his hero costume already packed away at his agency save for the bare essentials hidden under his trench coat. God he hated winter, took him twice as long to work up a sweat and when he finally did he had to shove it under a coat to avoid freezing on the way home.
“Oh hey you're back! I made meatloaf, kept it warm in the oven for ya!” The voice of his amazingly wonderful boyfriend drifted out from the bathroom and jump started his purr. He hung up his coat and wondered off towards the bathroom, food could wait, first and foremost he was going to trap his mate in his stinky arms and then take a shower.
Or at least that was his plan, right up until he saw his herkulane boyfriend dressed in nothing but a dress of a hoodie, checking himself out in the floor length mirror with the sleeves covering his hands like little paws.
Kirishima jumped when he noticed Bakugou starring at him. “O-oh h-hey!” He was blushing pretty bad and his smile had a nervous edge to it. “You startled me man, I figured you were gonna get some food first.” The red head laughed a little at how easily he'd been startled. To an extent he was a little worried about how Bakugou would feel about the hoodie, the blonde was a bit on the possessive side and even if Toyomitsu was clearly not a competing alpha, Kirishima was still doing the boyfriend sweater thing with the FatGum logo and his smell still on it.
But Bakugous face split in to a pleased grin and Kirishimas worry was quickly replaced with excitement. “Maybe I wanna eat you up.” He whispered seductively and the taller omega couldn't help but laugh as Bakugou walked over to slip an arm around his waist. The laughter was cut off by a gasp as Bakugou yanked on the neck of the hoodie to pull him in to a kiss, suddenly the room was filled with the sound of purring and the smell of a very happy omega. They pulled apart but Bakugou made sure to keep him close, giving him a quick nip on his neck. “You look how babies sound. Like, babies are gross looking but they sound angelic-ly adorable, at least when they laugh, and you look like that sound.”
“Awe babe!” Incredibly moved by the odd compliment Kirishima gushed and tucked his head in Bakugou's shoulder. Kirishima gave his mate a tight squeeze of a hug and Bakugou pet his back, both of them taking a moment to appreciate being lucky enough to have each other in their lives. After a moment the high pitch purr shifted lower and Bakugou heard the other inhale deeply. “Did you come to me first cause you know I like your post-work-smell?” The blonde grinned mischievously and scooped his boyfriend up in his arms, strong legs wrapping around his waist. Kirishima was more than strong enough to hold himself up but Bakugou was also more than strong enough to hold him up and hey, sometimes he liked to show off.
“So what if I did? I did promise I was gonna eat you up didn't I?” Of course he never /promised/ but that was hardly the point.
“Hmmmmm, did you say that?” Kirishima, who was feeling pretty perfect sized in his mates arms debated the offer. As much as he did really like Bakugou's hard work man sweat smell he was still surrounded by the comfy smell of his FatDad and didn't really know if he wanted to switch gears yet.
“How about this,” Bakugou licked a long stripe up his neck, nosing at his scent gland before sweetening the deal. “Let me suck you off in the shower and then after dinner we can cuddle in the nest.” His voice was dripping with seduction as he nipped at Kirishima's ear. “I'll make fancy hot coco.”
“Deal!”
The day Bakugou came in FatGum had actually been on the clock filing papers, but the moment his receptionist told him the blonde was here he decided to take his lunch break early. Bakugou might not have been an unofficial son but he was practically a son-in-law which was equally deserving of time in his eyes.
“What's up kid?” He greeted the other casually as Bakugou entered his office.
He was silent for a moment as seated himself and for a moment Toyomitsu was worried he'd fucked up with the hoodie gesture. “Nothing serious,” He said finally. “Partly I just wanted to thank you.” Toyo let out the breath he'd been holding in. “Eiji's been worrying about that stupid size shit for months and I couldn't seem to help enough. I don't know what you said but you saved his posture if nothing else.”
Toyo laughed, “Of course, he's a sweet kid and a damn good hero, he deserved to hold his head up high. But there's really no need to thank me, I was just doin my FatDad job.” Bakugou gave a smile that would put the Monalisa to shame with how small it was, but what spoke louder than his expression was the warmth in his eyes. “But you said that was just partly it, so what's the other business that brings ya in today?” His expression shifted then, again very slight though now he looked a bit more uncomfortable, a small blush tinting his ears.
“Where do you sh.... Can I get your measurements?” Toyo had expected nothing and was still surprised. “Eijirou really likes wearing your jacket,” Bakugou continued. “Wears it to sleep and shit. Wanted to get him more stuff in that size.” What Bakugou didn't say was that he wasn't gonna fuck Kirishima in a different heros cloths and his own merch only came in 4XL which was only a little big on his Goliath omega. He really wanted to get an oversized hoodie of his own for his mate and hopefully have it scented up before the next heat hit.
Toyo held back his laughter as best he could, sure he'd offend the hot tempered young hero if he laughed at the adorableness of his request. “Were you gonna ask me where I shop? I get a fair bit of my stuff custom made. Have a buddy that works in the fashion industry, I could forward him a request, give you my friend discount.”
“I don't care the cost but if you could give me his contact information.”
“Sure man, here,” He swiveled around in his chair, pulling out a post-it note and quickly scribbling down the phone number and email of his friend before handing it to the young hero who'd already stood to leave. “Guys an old-timer, responds better to email than phones.” Bakugou took the paper with a satisfactory nod, muttered out one final, “Thank you,” before turning to leave. “Oh hey Bakugou!” Toyo called out, stopping his son-in-law at the door. “Take care of him ya'hear?”
A soft smile slipped on to his face as he answered, “If anything were to happen to Eijirou I'd kill everyone responsible and burn the evidence.”
“Jesus kid,” Toyo clutched at his heart protecting titty. “I just meant keep him fed and stuff.”
Bakugou snorted out an odd little laugh “Obviously.” he remarked, and with that he was gone.