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A Smitten Alpha and her Stubborn Omega

Summary:

Katsuki never really thought about secondary genders. Never gave it a second thought, but then his best friend presented as an alpha and right after, he presented as an omega. For 3 years he was able to ignore his inner omega and focus on school, then freshman year happened. He started receiving the courting gifts. Each day, he’d find a new courting gift sitting on his desk at school, saturated in such strong alpha pheromones no one dared mess with it. This went on for a whole year until one day he came in to find another gift waiting for him with an alpha standing beside his desk. Something was different though, didn’t smell right, but the large male alpha poured his heart out, claiming the gifts were his. Usually, Katsuki would have talked to his best friend about it, get her opinion, but she was gone for a few days. 2 days later, the alpha walked him home, he attacked, but before he could lay a hand on Katsuki the real alpha that had been leaving the gifts appeared, his Deku.
Inspired by art from @Saby_Rod
https://x.com/Saby_Rod/status/1598418643460968449?t=FIwk2lpBcgwe9FHnyrl3GQ&s=19

Notes:

Packs live in one big house together. There’s a large pack nest in the family room for them to scent and snuggle. The Bakugou and Midoriya family are in a pack together. Each family gets a side of the house with their own rooms.
Mitsuki=Omega. Masaru=Alpha. Inko=Beta.

Chapter Text

“Hey Kacchan, are you excited for high school?” Izuku asks, kicking her legs out as they walk hands clasped behind her back. Kacchan and her were on their way to the cafe for a snack, the small alpha keeping a careful eye out around them. 

 

“You sound like my parents.” Katsuki grumbles, looking down at his phone, feeling relaxed and safe with his best friend's strong prime alpha pheromones around him, not willing to think much on the subject of why. 

 

Izuku’s head snaps to look at the omega, an awkward blush settling on her cheeks as she follows closely behind the blonde. 

 

“Well, a lot is going to change. We won’t be required to wear our patches and-and alpha’s will star-start wanting to- to court Kacchan.” She stutters, her inner alpha growling in displeasure at the idea of someone taking her omega from her. 

 

“Like I’d want any of those knot heads to court me. Hell, you can’t even smell me under all your fucking scent.” The blonde huffs, turning back to grin at the small alpha. 

 

“Pack scenting is important!” Is her immediate answer, flaring a bright red in embarrassment. “Kacchan's never complained before.” She grumbles, crossing her arms, only further amusing the omega. 

 

“I never said I didn’t.” He says honestly, smirking as he turns back to his phone. 

 

The greenette takes him in for a minute or two, curious if he would ever consider being courted, but knowing his incessant desire to avoid his secondary gender, it's not likely. 

 

“Would Kacchan ever… /want/ an alpha to… court him?” She asks hesitantly, eying at him carefully. 

 

Katsuki stops walking, putting away his phone as he turns around to face the nervous alpha, a blonde eyebrow raised in consideration. 

 

“I don’t much care for secondary genders, nor do I think about it much as you know,” except when his instincts kick in and he pulls the small prime into their pack nest for cuddles and scenting, but like hell he was going to talk about that. “But if the alpha has a head on their shoulders and a pleasant scent, then /maybe/ I’d consider letting them court me.” He says, scarlet eyes focused on the greenette, unsure what to make of the hope swirling in those wide beautiful emerald eyes. 

 

That’s the last they talk about the subject and when they finally start high school Izuku has her work cut out for her. It seemed every alpha in the school wanted a piece of Kacchan, but true to himself, he didn’t give them the time of day, didn’t even realize what they wanted, or maybe he didn’t want to. 

 

During the 1st month, she snapped after the 3rd alpha tried to not so sneakily scent her omega. 

 

“Deku, what the fuck is up with you?” Katsuki asks from their pack nest where the greenette had dragged him right out of his shower, instantly crowding up close to the confused omega and rubbing her cheek and wrist glands all over him. He bites away a pleased purr, choosing to ignore his inner omega's comfort as the shorter teen attempts to be the big spoon. 

 

“One of those idiots scented Kacchan.” She grumbles and continues to scent him possessively, the blonde huffs before reaching for the tv remote and turning it on, not realizing his joy in her actions had leaked into his scent. 

 

After that day, Katsuki couldn’t get his inner omega to shut about the prime. The usually silent beast constantly demanded to be scented and coddled by the greenette, and it only got worse when the mystery gifts started to appear. 

 

~1 Year Later~

 

“Aren’t you at least curious?!” Mina asks, shocked. The omegas were having a personal day at the spa, Katsuki filling them in on his latest gift from his secret alpha. 

 

“Ya, I don’t think I’ve ever heard of anyone receiving courting gifts for a whole /year/.” Denki says, putting his two cents in, sitting on Katsuki’s other side. 

 

“If they wanna spend money then let them. I’ve made it clear that I’m not looking for a mate.” Katsuki says nonchalantly. 

 

“I call bullshit. You were the one that told us more than /half/ the gifts were handmade, and I've seen them in your room.” Mina says with sass, pointing at the beautiful intricate necklace hanging from around his neck. “Have you received a collar yet?” 

 

Katsuki glares at her before turning away, not wanting to admit he had. A collar was the gift that symbolized the relationship was serious and that they would mate soon, which is why he hadn’t put it on and was still receiving gifts. 

 

The 2 other omegas groan, choosing to change the subject instead of trying to figure out why the stubborn blonde was still letting this mystery alpha court him without acknowledging it, even though they had a good idea of who it is. 

 

“So, where’s Izuku? I haven’t seen her hovering around you since Friday?” Denki says, turning to look at Katsuki. 

 

“It’s only been a day, shit head, and she went to go see her grandparents this weekend. She’ll be back Wednesday.” He says, ignoring how his inner omega whines pitifully about being separated from the alpha. 

 

“Oh, are you going to be okay with her being gone that long?” The pinkette asks, genuinely concerned. The last time the prime was gone for this long, Katsuki had spent the last few days in his nest, surrounded by every piece of clothing he could steal from Izuku’s room, glaring at anyone that tried to move him. 

 

“What’s that supposed to mean?! Of course I’ll be fine! I don’t need that stupid nerd all the time!” Katsuki growls, face flushed as he tries to focus on anything other than her. 

 

‘/She’s right though! We need our alpha! Miss alpha!/’ His inner omega pouts, but he shoves it aside. 

 

“You know, one of these days it’s going to come back to bite you in the ass that you ignore your omega so much.” Denki says matter-of-factly, turning to look out the corner of his eye at the glaring teen. 

 

“You don’t know shit.” Katsuki snaps, even though he can feel it in his bones they’re right, but he wasn’t going to let himself be ruled by his secondary gender. He refused. 

 

The weekend passes and he can feel himself getting increasingly irritable the longer Izuku is gone. When Monday arrives and he finds a gift on his desk he can’t help but frown, further convincing him that it's not from the alpha his omega chose and what’s even worse is there’s someone standing beside his desk, an alpha. 

 

Katsuki scowls as he walks over to his desk, ignoring the smiling boy. 

 

“Can I help you?” The omega snaps, dropping his bag beside his chair before sitting down, picking up his gift. It was wrapped in the usual green paper with little puppies on it finished off with an orange bow, but instead of that ozone and pine scent that reminded him of Deku there was another one over it. The smell of rubber making his nose wrinkle in disgust. 

 

“I wanted to introduce myself and /personally/ give you my gift for today.” The random alpha says, standing straight. 

 

Scarlet eyes flick up to him, unimpressed. 

 

“I don’t see a gift.” Katsuki says blandly, going to put his present into his bag when the boy speaks up again.

 

“But you do.” The alpha says slyly, grinning proudly. 

 

A cold shiver runs down the omega’s spine as he flinches and throws the gift back onto his desk like it burned him. 

 

“Excuse me?!” The blonde says, aghast, face screwed up in a violent cringe. 

 

“That’s my gift. I’m the one that’s been leaving them all this time.” He says puffing out his chest in pride, completely ignoring the discomfort in Katsuki’s scent and his expression of disgust. 

 

“I highly doubt that.” The omega says, turning away from the alpha to pull out his notebook and textbook, but the male isn’t easily deterred. 

 

“I’ll see you after school! I’ll walk you home!” He says before walking over to his desk across the room, flinching slightly at the murderous glare from a certain redheaded alpha. 

 

~Wednesday~

 

Katsuki frowns, totally over this week and for one reason, Akio. The stupid alpha had made it a point to be all up in the blonde’s business for the last 3 days. Every time the alpha tried to scent him, like they were courting the fucking knot head, Katsuki would growl at the boy, threatening to rip him apart. 

 

“Come on, /baby/, I just want to mark what’s mine.” Akio grins cruelly, cornering the omega a block away from the school, in an alley. “Why do you keep fighting it?” 

 

“I am NOT yours! I never asked you to bother me, and if you don’t like it, then leave me ALONE!” Katsuki snarls, moving to step around the alpha and leave only for the boy to grab his arm, /tightly/, and throw him against one of the walls, nearly knocking the air from the blonde’s lungs. “Let go of me!” 

 

“I didn’t go through all this hassle not to get a /taste/!” The alpha growls, pining the omega to the wall, but before he can enact his horrid plan a piercing feral growl slices through the alley, making the lesser alpha freeze. 

 

“Get away from my omega!” Izuku snarls, large alpha fangs bared, her prime pheromones smothering them. 

 

When Akio doesn’t step away from Katsuki, frozen in fear, the greenette attacks, shoving him off Kacchan before punching the nasty alpha right in the nose. They hear a sickening crack before he’s running out of the alley crying like a baby. Leaving a speechless Katsuki and a furious Izuku behind.