Izuku balked at Kacchan in surprise as the other roughly gripped his collar, he could've sworn that the pheromone eraser soap had eradicated any remnants of the other alpha's scent. Izuku's eyes looked down at the hands that were partially cutting off his air as he was being lifted from his seat, and he bit his lip before attempting to unravel Kacchan's hands firmly. It was an act of defiance from the omega that caught Katsuki by surprise, and he practically threw the other boy back into the loveseat he was on, "Tch, shitty nerd, explain." Izuku straightened his collar before quickly glancing into the kitchen to see if their mothers had heard the commotion, surprisingly they had not. The two women continued chitchatting probably dismissing any loudness as Katsuki's usual gruff said.
Izuku sighed, "I don't know what you're talking about Kacchan. Even if I did it's none of your business anyway." The young omega tensed bracing himself for the backlash from the alpha due to being so defiant, he had no idea how the soap hadn't worked. Katsuki frowned, he did not even know why he was as upset as he was. He had only agreed to come with his mother to the Midoriya residence because he was told that was where dinner would be. The shitty old hag had refused to bring leftovers home, so he was forced to go if he wanted to eat a warm meal for dinner. Katsuki had changed into a black wife beater and baggy gray sweatpants before they left for the Midoriya residence and had decided to lounge on the couch while he waited for them to begin dinner preparations.
Izuku wandered into the home about an hour later smelling fresh and clean, but the half-and-half bastard's scent faintly lingered on the greenette. Katsuki was going to be the top hero one day and was also an alpha in his prime, of course, he could smell traces of his omega being with another alpha. Katsuki sighed in annoyance, Izuku was being stubborn and acting as if he was too fucking stupid to know what he was talking about. He stood in front of the other and glared down at Izuku who was refusing to meet his gaze, "I can fucking smell it, shitty Deku." Izuku grimaced a bit knowing that the young alpha had always had a superior sense of smell and lifted his uniform to smell if traces of Todoroki had somehow lingered on the clothes.
Katsuki reached out, his sharp gaze piercing through Izuku and yet again let his hand slide down Izuku's neck. This time the spiky blonde's hand briefly grazed the bandage on Izuku's scent gland. The freckled boy blushed vehemently before he quickly smacked the hand away. Izuku quickly covered the spot on his neck with his hand as he recoiled from Katsuki. His mind was racing with thoughts of whether Katsuki knew the claiming when they were younger had scarred or if he had even felt the bandage covering his glands like Izuku thought he did. He pursed his lips, "K-kacchan! You can't keep doing that people will misunderstand!"
Katsuki did not say anything as he put his hands in his grey sweatpants scowling at the boy beneath him. He had felt the bandage on Izuku's glands, and the other boy was doing a piss poor job at trying to hide it in the first place. Katsuki couldn't tell whether the shitty Deku had any sense of self-preservation by covering it or if he had been hiding something. Deku was acting suspicious as hell, he briefly let his mind wonder if the previous marking had scarred. His eyes narrowed, they had been four years old when the marking incident happened, and his shitty old hag told him Izuku's family had sought medical attention shortly after.
Katsuki erased that thought from his mind, if the marking had stuck then Izuku wouldn't have been flaunting himself in front of the other alphas at school. He ran his hand through his hair irritated at remembering how Izuku was perfectly okay with changing in front of the other alphas. Shitty Deku had even flirted with the half-and-half bastard after school for the other alpha's scent to linger on the omega. Katsuki briefly glanced at the kitchen where the two women were still shooting the shit delaying dinner. Katsuki frowned, "Whatever, I'm out of here."
Katsuki stormed off towards the door, he needed to let off some steam, so he decided to go another run to clear his head. He would stop by a convenience store on his way back and get himself some fucking dinner since his shitty old hag was too busy gossiping to focus on making dinner. It was obvious the two women had not even started the cooking aspect of dinner and he would be damned if he had to stay in the Midoriya residence any longer. Katsuki angrily slipped his shoes on and slammed the door on his way out which managed to catch his mother's attention. Mitsuki shook her head, "That boy is too impatient for his own good. I'm sorry for his rudeness Inko-san."
Inko raised her hands sheepishly, "It's fine Mitsuki-chan! Perhaps we were chatting for too long," she giggled bashfully. Izuku finally breathed a sigh of relief, he felt as though he had been walking on eggshells since he got home. He had not been expecting Kacchan to be in his home or to be accosted by him the moment he sat down. Izuku rubbed his neck, he had been scented yet again by the blond for supposedly smelling like Todoroki-kun. He remembered this level of possessiveness from when they were younger, but he had been surprised to see that Kacchan had not yet outgrown it.
Kacchan wasn't four years old anymore, this level of possession was only acceptable between mates, which they weren't. Izuku had been surprised when the other had abruptly left after the scenting. A part of him was internally pleased with the alpha's level of possessiveness, it meant that he mattered to Kacchan, and his omega instincts yearned for a strong alpha. That was the confusing part though, because the blond would immediately brush him off as if he didn't matter at all. Kacchan was always calling him a useless quirkless omega, how could Izuku truly matter to him?
This meant that Kacchan was acting like a grade schooler, not wanting his childhood best friend to befriend others. Izuku huffed, the other alpha had not been back very long in his life as Izuku had transferred schools towards the end of the semester before he took the admission test to UA. Kacchan's treatment towards him at middle school was less reactive, perhaps because he had been the only alpha in middle school. Izuku had managed to get into UA by special recommendation of his hero, All Might. He might currently be a quirkless omega, but he was undergoing All Might's training regime to train his body to inherit his quirk when the other deemed he was ready.
The odd pair had met shortly after he reunited with Kacchan and Izuku had begged desperately to learn how to be a hero. By chance, All Might's secret condition had been revealed to him after he had clung to the other's leg shortly after he had apprehended a slime villain. It was the same villain that Kacchan had been enveloped in after All Might had dropped the villain due to his interference with the professional hero. Kacchan had impressively resisted the slime villain for several minutes before he briefly passed out due to oxygen deprivation. Izuku had leaped into action as soon as he saw Kacchan losing consciousness before he even knew his legs were moving.
The young omega's recklessness had spurred All Might into action after he witnessed the scene of the quirkless boy rushing in to save his friend. The bookbag Izuku had thrown had seemingly given Kacchan a moment to breathe even while unconscious. Izuku had no weapons so all he had been able to do at the time was scratch away at the villain. All Might had saved the day and the two young boys with an explosive punch as he grabbed Kacchan with his other arm. Izuku was harshly scolded by the pro-heroes at the scene for his recklessness, and he quickly left the scene with All Might before Kacchan awoke.
Izuku had kept the incident hidden from Kacchan as nothing good would happen from the alpha knowing the quirkless omega had stepped in to help. The pro-heroes who had experienced the villain's quirk had nothing but praise for Kacchan resisting the villain as long as he did. Even the pro-heroes had felt suffocated by the villain after several short seconds and Kacchan had resisted for several minutes. Izuku had been able to do nothing but foolishly rush in and scratch away at the villain in hopes he could clear an airway for the spiky-haired blond. Still, it had been enough for All Might to accept taking him under his wing.
A week's worth of hard training wasn't enough to make him an appropriate vessel for All Might's power. So, he had been specially recommended by All Might and had aced the written portion of the hero exam. Even those results weren't enough to initially gain entry to the prestigious hero school, but UA needed omegas in the hero department as part of their diversity quota. He was also the only omega who had applied for the hero course, and he had the legendary All Might backing him. As such Izuku had narrowly managed to secure entry to the school and almost got expelled on the first day.
It was just his luck that he managed to be in the same class as Kacchan. He had been excited to see him until he noticed what a sour mood the other had been in from the start of the day. Izuku blushed and covered his face with his hands as he recalled Kacchan's public scentings in front of the other boys in his class. Everyone was already thinking that there was something else going on between the two of them and Kacchan was not helping as he continually scent-marked him. Izuku was baffled as to why Kacchan kept doing so and doubted that Kacchan had any underlying reason other than to ward off alphas.
Izuku pondered if Kacchan was trying to protect him from his other classmates but quickly brushed that thought away. Kacchan had not been very helpful in the brief time that they attended the same middle school and had even quipped in on calling him useless in front of the others. Izuku was jotting down more Kacchan journal entries, making sure to note that the alpha did indeed have a heightened sense of smell as he suspected. The only logical reason Izuku could think of for the public displays was that Kacchan was intimidated by the other alphas in the class. Kacchan had always strived to be the best in everything, perhaps claiming an omega he had known would make him look better in front of the other alphas.
Izuku held his pen to his lips and bit at the tip of it in thought, if that was the case it appeared that the other alphas were less than impressed by his treatment towards Izuku. Perhaps most of his alpha classmates were more traditional and expected to treat omegas as dainty defenseless creatures. Izuku frowned, he didn't need the other alphas in class to protect him. Izuku had long been training his body to become a hero even before he met All Might and planned on using the firsthand experience at UA to effectively use his quirk. All Might had hinted that due to his entry into UA and the near completion of clearing the beach, he would be ready soon as a vessel.
Izuku looked up as he heard his mom calling for him, "Izuku, dinner is ready!" He closed his journal and went to join the two talkative women at the table. They had served pork katsudon which looked exceptionally yummy. Izuku cleared his plate quickly eating his fill and even Kacchan's portion, he needed to continue bulking. Izuku's chances of finding a mate had already been dampened greatly by the blond, so he couldn't care less if he wasn't as soft and lovable as other omegas, he wanted to be a hero more. If he became a pro-hero the blond would be forced to acknowledge him, he would no longer be useless.