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Todoroki Shouto liked to think he was rather observant, he had to be especially in the household he grew up in. With his careful observations of the world came startling conclusions, connecting the dots that other people were oblivious to.
For example, despite acting like they hated one another, Mount Lady and Kamui Woods were most definitely dating. He told this to his sister, and she’d only brushed off his observation with a gentle laugh and a hair ruffle. He’d been indignant, he just knew his theories were correct! He just had to find one he could prove, and that’d show everyone, show Natsuo and Fuyumi that it wasn’t just something he came up with.
Then he’d entered U.A and met an interesting bunch of people. First, Yaomomo was related to Fat Gum, there was no doubt in his mind about it. Their quirks were just so similar, it made perfect sense, not to mention her personality when she was in her element, it rivaled Fat Gums own.
Tokoyami was a cousin of Hawks, enough said. Bakugou was the son of best jeanist, he couldn’t find any evidence, but God damn it he knew it was true. Once he had evidence the ruse was over for Bakugou, there would be no hiding from Shouto.
Lastly there was Yamazawa Izuku. The green haired boy was a complete enigma, he had eye bags to rival Aizawa Sensei’s own, a coffee always in hand, no matter the time of day. He had green hair that was almost black in most lighting and onyx eyes like their sensei’s, and his quirk, Kami his quirk was just like Aizawa’s.
Yamazawa’s quirk was basically a version of eraser on steroids, lasting longer and had a bigger area of reach to it. His own eyes glowed green instead of red when he used it, and not only his hair levitated when using nullify (the name of his quirk he later learned) but objects in his close vicinity would seemingly levitate as well.
Overall, it was a seemingly cut and dry case, but his classmates shut him down rather quickly when he brought it up, so he’d just have to dig deeper to find the truth.
[1]
The first bit of evidence outside of Yamazawa’s appearance and quirk came in the appearance of the USJ, a rather traumatizing event for anyone who had been there.
All the students had been scattered around the facility, Shouto himself in the avalanche zone, making his way towards the center plaza. He was hoping and praying by the time he got there that things would be settled down and Aizawa Sensei would have everything handled. The villains were small fries yes, but he was a first-year student being attacked by very real villains in his second week of school.
The dual toned boy made it to the center plaza, met with the sight of Aizawa, his Sensei surrounded by a pool of his own blood, a hulking beast of bulging muscles standing over him. Before he could even think of anything to do, a blur of black came darting from the edge of the water.
“Aizawa!” He knew that voice, it was Yamazawa, and he was going to get himself killed. Shouto made a split-second decision, rushing forward to assist the smaller male, who was dodging the creatures terrifying blows.
“Yamazawa, I’ll immobilize it, you stab it in the brain!” Shouto barked out, eyes trained on the beast as he sent a wave of ice towards it, encasing its lower half and torso in ice, hopefully keeping it still so Yamazawa could stab it.
Yamazawa didn’t hesitate under pressure, climbing the beast like it was a tree and stabbing one of his many knives into the creature’s brain, a resounding screech echoing the USJ as its beady eyes rolled back.
Izuku hopped off the monster, standing protectively in front of their Sensei, eyeing the mist villain and the leader of this whole thing.
“You fucked with the wrong class.” Yamazawa’s eyes glowed green as his quirk activated, the mist man practically deflating.
“And you fucked with the wrong kids d- Sensei” Before Shouto could stop him Yamazawa was rushing forward, all but a blur as he sent a barrage of attacks at the villains, Hand man was down for the count first, and in a second when Yamazawa had to blink, they were gone.
All that was left was traumatized teenagers, downed villains, and their injured teacher, whom Yamazawa was now at the side of, murmuring to quietly for Shouto to hear. Their other teachers came not five minutes later and Shouto was led from the sight of Yamazawa cradling their teacher like he was the most precious thing on this earth, hands stained with the man’s blood.
[2]
The second piece of evidence was not nearly as traumatizing, it was just rather... odd, to say the least. It had been rather obvious since the start of class that morning that Yamazawa hadn’t gotten any sleep the previous night.
The boy’s scowl was deeper than usual, head lulling to the side periodically, only to be nudged back awake by Shinsou. He’d shoot his friend a thankful look before going back to glaring at their work like it had personally offended him.
Overall, pretty weird, but not something to mark him as Aizawa Sensei’s child. Then came lunch time.
Usually when lunch came around Yamazawa would accompany Shinsou, Uraraka and Iida to the cafeteria where they’d sit at a secluded table where no one would bother them, today Yamazawa stayed behind in class, earning a few sympathetic pats from his friends.
Shouto had thought nothing of it, until he had returned to the classroom early so he could finish up he homework for English the next lesson. When he slid the door open, he was met with a rather interesting sight.
Both Aizawa and Yamazawa were curled up in the yellow atrocity of a sleeping bag that Aizawa Sensei carried around. Yamazawa was curled up against their Sensei’s side, face buried in the man’s capture weapon while the pro simply ate his jelly packet and scrolled on his phone.
Onyx eyes looked up when the door slid open, an eyebrow raising when Shouto paused at the sight.
“What’re you doing back earlier Todoroki?” The black haired man questioned, throwing the now empty jelly packet in the trashcan with practiced movements.
“I wanted to finish my English homework, Sensei.” Shouto replied dutifully, moving towards the back of the classroom so he could sit down. The teacher simply shrugged, shimmying further down in his sleeping bag and sliding his eyes shut.
Huh.
[3]
The third time he has a solid piece of evidence is after the sports festival, Yamazawa had made him realize his powers were just that, his. He hadn’t been observing the possible father son duo as much the week before internships, too much in his own head after the revelation.
Instead, he was hit with evidence like a 10-pound bowling ball after the fight with the Hero Killer. Izuku had saved his and Iida’s asses honestly, if it wasn’t for him cancelling out Stain’s quirk for 90% of the fight, they’d probably be dead in that alley.
That being said, all of them had suffered from cuts, stab wounds and bruises, varying in severity; so, they were forced to stay in the hospital at least overnight. (Or longer in Iida and Yamazawa’s case.)
Yamazawa was curled up on his best, half asleep as himself and Iida talked quietly, trying to respect that the other boy was probably trying to catch up on some much needed rest. The peaceful silence was interrupted by the door being thrown open by Aizawa Sensei and Yamada Sensei?
“Kid what the fuck?” Aizawa breathed out, rushing forward towards Yamazawa’s bed to card his fingers through the teenager’s hair. Said teen opened his eyes, staring up at the other with a bleary gaze.
“Mhm, sup?” Yamada barked out a seemingly wet laugh, taking a visitor’s chair and placing it at Yamazawa’s bed side.
“Hey little listener, how’re you feeling?” He questioned, cupping his hand around Yamazawa’s. The green haired boy gave the two adults a shit eating grin.
“They got me on the good shit.”
Iida let out a scandalized sound, yelling out something along the lines of ‘Yamazawa don’t curse in front of our Sensei’s!’ but it went mostly ignored as Yamada snorted, giving his hand a squeeze.
“That’s good kiddo, get some sleep yeah?” The blonde offered, thumb brushing over bruised knuckles as Aizawa Sensei took a seat next to him.
“We’ll be right here.” The dark-haired man promised, resting his hand on top of the already joined hands. Yamazawa hummed, burrowing deeper into his pillows and within moments he was out like a light.
HUH.
[4]
Fourth piece of evidence came on a normal school day, nothing extraordinary was happening. Aizawa Sensei was teaching his lesson, droning on about law and ethics and the importance of the thin line between Vigilantism and Villainism.
From the corner of Shouto’s eye he saw Yamazawa’s hand shoot up. Sensei heaved a great sigh, like he knew the question before it was even being asked.
“Yes problem child?” Yamazawa just grinned brightly at the nickname eyes shining with mirth.
“So dad-“ The boy paused, wincing as the class was in immediate uproar, his usual stoic face bright red in embarrassment. That was until his eyes shined with a devious gleam.
“Dadzawa.”
“Absolutely not.”
“Eraserdad.”
“I’ll expel you.”
“Eraserfather.”
“I swear to god problem child ask your question or shut it.” Yamazawa just grinned at their Sensei, tipping his head to the side.
“So Dadzawa could a quirkless person a vigilante, since vigilantism is defined by illegal quirk usage.” The class was in immediate uproar once more.
Shouto had more evidence to put on his conspiracy board later when he got home.
[5]
The fifth piece of evidence was the one that hurt the most to collect. It happened at the summer camp. They’d been successful in getting Bakugou and Tokoyami back, yes, but in return the villains had been able to catch Yamazawa.
Shouto would never be able to forget the look that crossed over Aizawa Sensei’s face when their group trudged into camp, Bakugou openly sobbing as Shouji dragged him along, crying out ‘that damn nerd should’ve let the villains have him.’ Aoyama was supporting Uraraka and Tsuyu, the two girls crying out for their friend who was long gone and somewhere they couldn’t follow.
Shouto’s own usually stoic features were broken by the tears that ran down his cheeks, eyes finding their Sensei in all the chaos around them.
His voice was but a hoarse croak after screaming and crying out for his friend long after the portal had disappeared.
“They took Izuku.” It was the first time he’d ever used his friends given name, but he couldn’t call him Yamazawa anymore, Izuku was his best friend, and he was gone.
Aizawa’s face had crumpled in agony, his body recoiling at his students’ words, blinking rapidly as if trying to understand what was spoken to him. Distantly Shouto heard Uraraka’s sobs get louder at his words.
After that their Sensei wasn’t seen much, he apparently was throwing himself into finding Izuku, alongside Yamada Sensei.
Some students couldn’t stand by idly and wait for the pros to find Izuku though, so they went out and found him themselves.
Thank god they did, because Kamino was a fucking wreck and a half, they’d barely saved Izuku in time from being kidnapped again. He didn’t look amazing, but he also didn’t look like he’d been tortured so Shouto took it as a win.
The reunion with Aizawa and Yamada had been eye opening to say the least.
The two men had practically tackled the teen, Yamada Sensei was sobbing loudly, while Aizawa Sensei had silent tears running down his cheeks, the green haired boy squished protectively between their bodies as a family reunited.
[+1]
Shouto was officially ready to show the evidence he had to Aizawa and Izuku, to expose them of hiding the fact that they were father and son.
Said duo was sitting on the couch, surrounded by the rest of the class as Shouto pointed at each point on his cork board. It was a completely solid theory, no one could tell him they weren’t father and son!
After a 30 minute explanation, Shouto felt as though he had explained himself well enough, turning to face the two subjects of his theory.
Aizawa and Izuku were both sucking on jelly pouches, identical bored expressions on their faces, onyx eyes boring into Shouto’s soul.
“What do you two have to say for yourselves?”
Aizawa elbowed Izuku, causing the green haired boy to choke on his jelly pack for a second, coughing rather violently, much to the classes concern, before speaking.
“I mean, I call him Dadzawa, we literally have the same quirk, mines just stronger, and look the exact same. I thought it was obvious I was his son?”
Izuku tipped his head to the side like a confused puppy as the class screamed in confusion, betrayal, and horror at there being a second Aizawa.
Shouto felt fulfilled, he had succeeded in showing people that his theories were correct, no one could call him crazy again.