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Aizawa and His Three Biological Children

Summary:

Asui: Oh, btw, Aizawa sensei, you're my biological father.
Midoriya: Same.
Tokoyami: Same.
Aizawa: Excuse me, what?

Notes:

Okay, have any of you seen those fics where all of class 1A is either All Might’s kids or Aizawa’s kids? Anyways, they’re fun, though the Aizawa ones tend to have angsty backstories for the poor kids. And I kinda wanted to contribute to the trope, but I also didn’t want angsty backstories, actual adoption or too many POVs to keep track of. So I thought, how about just three kids? I picked Asui and Izuku, but Sectordweller picked Tokoyami and Dark Shadow.
Tokoyami has the bird mutation passed down from his mom, but Aizawa’s quirk powered up her shadow manipulation quirk to being Dark Shadow and allows Dark Shadow to use Erasure. Dark Shadow, being a quirk construct doesn’t actually need to blink. The doctors are unsure if Dark Shadow is a conjoined twin or just a lucky mutation. Needless to say, Tokoyami is very OP.

Asui inherits the majority of her quirk directly from her mom, but her mild poison that in canon just makes people itch or whatever here has a quirk suppressant ability. Also, she may be able to make it stronger with practice. Scientists would probably kill to get their hands on it, since equivalent quirk suppressants don’t actually exist yet. Asui might go along with that, provided the results are going to heroes and law enforcement. She will probably eventually include a poison dart gun in her costume.

Izuku gets Erasure, with slightly stronger telekinesis, since that’s from both sides. He also has a third eyelid like a bird, which eliminates the ‘needs to blink’ issue for up to several minutes. He also has OFA, but I haven’t figured out how/if it powers up Erasure at all. He will get better quirk counseling sooner in this one and as a result, break many less bones.

(See the end of the work for more notes.)

Work Text:

“My name is Shouta Aizawa and I am your homeroom teacher. Nice to meet you.” The black haired man says.

“Oh, hi, dad.” Asui says.

Aizawa sensei pauses. “Excuse me?”

“People often tell me I’m too blunt, so I’ll just say it. Before my parents got married, my mother decided to have a child. Since she was not in a relationship at the time, she went to a fertility clinic and obtained a donor with recessive quirk genes. My biological father is Shouta Aizawa.” Asui replies.

Izuku raises his hand. “Me too, actually.”

A boy with a bird head nods. “The same is true for me.”

“Holy shit!” A blond boy with a jagged streak in his hair exclaims, obviously fascinated with the conversation.

“The fuck!? Nerd, your father lives in America!” Kacchan blusters.

He shrugs. “He didn’t want kids of his own, but he was happy to let mom find a donor and have a kid for her to raise.”

“Is this why you always refused to use your quirk?” Kacchan asks suspiciously. Honestly, he’s not sure Kacchan even remembers what his quirk is.

“I mean, yeah.” He admits. Izuku knows how others would regard his quirk. In interests of not being ostracized, he’s never advertised it. Pretty much everyone had assumed it was his mutation of having a third, clear eyelid.

“And why you call your deadbeat dad a hero?” Kacchan persists.

“Well, yeah. Because he is one.” Izuku snarks, done with the conversation.

Kacchan at least recognizes that and turns back around.

The boy with a bird head nods again. “My moms wanted a kid, so they found a donor.”

The other kids are watching them avidly, like this is some kind of reality show or something.

Aizawa sensei looks like he sincerely wants to ask, ‘What the fuck?’ Instead, he clears his throat. “There are gym uniforms under your desks. Get changed and meet me at Field Beta.”

~

Husbands chat

SleepDeprived: So, Hizashi, did I ever tell you I sold semen fresh out of highschool so I could afford rent the first month?

Loudness: WHAT? No. You didn’t.

Loudness: Has something happened connected to that?

SleepDeprived: Well, you could say that.

SleepDeprived: Three kids in my class today claimed I’m their biological father and told the class their backstories.

Loudness: SO#)*GN#WLRWKosir!@!@#

Loudness: Holy shit! Does Nedzu know?

SleepDeprived: In what world would he not know?

Loudness: Shou! Shou! You know what this means!? We’re dads now!

SleepDeprived: They have parents.

Loudness: Everyone could use a second set of loving parents. It’s official! We’re dads!

SleepDeprived: We’re not- I have to go.

Loudness: I can’t wait to meet them!

Loudness: Don’t expel them!

~

Shouta tucks his phone away and eyes the first kid to show up. His son apparently.

With a sigh, he bites the bullet. “How do you know my name? I distinctly remember signing papers that would ensure my privacy.”

“Oh, that. Turns out they didn’t adhere to any of the privacy practices. They told everyone who the donors were. They got shut down five years ago for that when one of the mothers searched up the father and dumped her kid on him. He sued and dumped the kid in foster care. Then his mother found out and adopted the kid.” Midoriya explains casually. “Oh! Don’t worry about me expecting you to be a father figure. I mean, that’d be cool, but I know you’re not looking for a father-son relationship, so I’m not expecting anything from you other than being my teacher.”

Well, that’s a relief. Not that it means Hizashi will allow it.

“How do you know I’m a hero?” He wonders. As an undergrounder, there’s very little information about him available.

Midoriya gives him a pitying look. “You won two of your three sports festivals at UA and the second and third year you were a hero course member. I searched you up when I was…10? Yeah, ten. And periodically searched up any videos that show you as Eraserhead. You’re really a great underground hero! You and All Might are my inspirations as a hero!”

“What’s your quirk? You implied it was Erasure in class, but I saw you break three limbs in the entrance exam.” He asks.

“You didn’t read our files?” Midoriya asks in surprise.

Shouta frowns. “Not until the second day, after I’m sure I’m not going to be expelling them the first day.”

Midoriya doesn’t even look surprised, apparently familiar with his reputation for expulsions. “Oh. Okay. All Might said I could tell my parents, so-”

The sound of voices make them both look around to see the other students finally approaching.

“I’ll tell you later.” Midoriya finishes. “It’s kind of a national secret.”

What!? Dammit All Might!

The QAT is a shit show.

Ashido calls it ‘fun’ and Shouta threatens to expel the person who comes last.

Midoriya uses his quirk to light up his arm. Shouta erases it and reminds him that he can’t be a hero if he becomes a liability after only one move. Midoriya uses his quirk on his finger and tells him that he’s still standing. Honestly, Shouta’s a bit impressed at the cleverness.

Then Bakugou flings himself at Midoriya screaming about him lying about his quirk all these years and Shouta has to use his capture weapon and quirk on him. “Bakugou, behave yourself and quit making me use my quirk. It gives me dry eye. Also, have some manners when asking people questions. You wouldn’t like it if people threw themselves screaming at you, demanding answers.”

Bakugou has the gall to give him a shocked look, but at least he desists.

Then the short ball headed boy has the fucking impudence to grope the invisible girl right in front of him, like that’s ever okay.

“Minoru Mineta, you’re expelled.” He says.

“What!? What did I do!? I didn’t do anything wrong!” Mineta exclaims.

“You literally just groped someone in front of me. I’m sure Nedzu has it on camera too. That’s sexual misconduct. I’m not letting a walking sexual harassment case become a hero. Go to Nedzu’s office now.” He orders, flaring his quirk.

Mineta backs down and walks away grumbling about it not being fair that he can’t ‘get all the ladies’ and that he doesn’t know who his parents are.

Shouta does, in fact, know whose Mineta’s parents are. They’re the only reason he was accepted to the course in the first place and they’ll probably be able to keep him in UA, at least until the next time he decides to be an active pervert and cross boundaries. The Minetas may be wealthy donors, but Nedzu will be entirely willing to take the loss if his behavior continues. The money is not worth the loss of reputation that Mineta could bring to UA if he doesn’t shape up.

Then Hagakure throws herself at him for a hug, crying and shaking and thanking him over and over. Like she thought he’d just let that kind of thing pass because she’s literally invisible.

~

Teachers chat

Nedzu: Aizawa, that was fast. Thank you for bringing this to my attention.

Midnight: Ooh, who did Shouta expel this time?

PresentMic: You didn’t expel one of our kids, did you?

Cementoss: What happened?

Aizawa: Mineta happened. He fucking groped one of my female students in front of me. Mineta is no longer a member of the hero course.

Nedzu: Correction. Mineta is no longer a student of UA. His parents refused to agree to mandatory therapy, so he was expelled.

Midnight: Good!

PresentMic: YEAH!

Snipe: Wow, what a little fucker. Good riddance to bad rubbish.

Midnight: Hizashi, what do you mean by ‘our kids’?

Aizawa: Hizashi, don’t you dare.

PresentMic: [zipped lips emoji]

Nedzu: He means that three of the 1A kids are Aizawa’s biological children via artificial insemination due to him being a donor in his youth.

Aizawa: Kami damn it, Nedzu! You did this on purpose.

Nedzu: Of course. Though, actually, you chose those three yourself, if you recall.

Aizawa: … Fuck you.

Nedzu: No thanks.

Yagi: Can I ask which three kids?

Aizawa: … Might as well, I guess.

Aizawa: Asui

Aizawa: Tokoyami

Aizawa: And Midoriya. Who apparently has a national secret to tell me, All Might.

Yagi: What-? Oh. Oh no.

Aizawa: You said he could tell his parents. You going to go back on that and break his trust?

Yagi: Oh fuck. Midoriya knows?

Aizawa: The kids were the ones who told me.

Yagi: FUCK.

Nedzu: If I may? Yagi, Aizawa and Yamada are perfectly trustworthy and will be useful in the pursuit of allowing Midoriya to better control his quirk.

Yagi: Oh. I suppose. Why Yamada?

PresentMic: Because Shouta and I are married. And I have experience with a hard to control quirk.

Yagi: Wait. Since when?

PresentMic: Since two years after we graduated from UA?

Yagi: Oh. I apologize.

PresentMic: For what?

Yagi: For not knowing.

PresentMic: It’s fine. I don’t think anyone thought to tell you.

PowerLoader: Are we just going to ignore the fact that Midoriya knows a national secret?

Aizawa: Yes, yes, you are going to do just that.

PowerLoader: Okay then. Maybe use one of the soundproofed meeting rooms to discuss it, then.

PresentMic: Excellent idea!

PresentMic: Nemuri? You okay? You’ve been quiet.

Midnight: Just trying to process that I’m an aunt to three now.

Midnight: And looking up their files. Shouta, how are your kids so cute when you’re so ugly?

Aizawa: Rude. And recessive genes.

Midnight: Must just be the looks that are recessive, then. All three of them have an aspect of your quirk to theirs. Asui’s poison can temporarily erase quirks. Tokoyami’s shadow quirk can use Erasure. And Midoriya has a souped-up version of yours with…that’s weird.

PresentMic: What’s weird?

Midnight: A sudden quirk evolution just before UA that gives him enhanced strength.

Snipe: Quirks don’t work like that. Unless his mom has a strength quirk?

Midnight: No, she has a telekinesis quirk.

Snipe: National secret, eh? All Might, what exactly did you give that boy?

Shuzenji: Something you can rest assured is one of a kind and can’t be replicated. Also, something very reckless to give him. And that’s all you need to know.

Nedzu: Shuzenji is correct. That is all you need to know.

Snipe: Aye, aye, boss.

~

“I’m Hizashi Yamada, your English teacher. Welcome to UA, kiddos! Also: Asui, Midoriya and Tokoyami, feel free to call me Papa.” Present Mic says boisterously.

The class bursts into whispers.

Izuku raises his hand.

“Midoriya? You have a question?” Yamada sensei asks.

“Does this mean you and Aizawa sensei are married?” Izuku guesses.

“Right you are! But don’t spread it around, okay? It wouldn’t be good if our enemies found out and used us against each other.” Yamada sensei answers.

The class bursts into more whispers. One of them is louder than the rest. “Dadzawa and Papamada!”

Yamada sensei shoots finger guns at Kaminari. “You got it!” Then he turns back and meets Izuku’s, Asui’s and Tokoyami’s eyes in turn. “Just for clarification, neither of us are going to go easy on you just because you’re our kids. We’ll be expecting more from you, actually. Tough love is the best kind of love in hero school. Got it?”

“Yes, sensei.” Tokoyami says with a nod.

“Got it, Papa.” Asui says. Her expression doesn’t change, but Izuku’s pretty sure she’s smiling.

“Yeah, Yamada sensei.” Izuku replies.

Dark Shadow pops out. “Does that mean I can call you Papa too?”

Yamada sensei grins. “Of course!”

“Yay! Fumie, Fumie! We finally got dads!” Dark Shadow says excitedly.

“Dark Shadow, calm down.” Tokoyami says, his feathers ruffling slightly. Izuku wonders if it’s embarrassment.

A moment later, Yamada sensei calls the class to order. Izuku will have to process the idea of having two extra father figures later. On the one hand, he’s pretty sure Aizawa sensei wants nothing to do with them outside of being their teacher. On the other, Present Mic is his husband. And Yamada sensei seems very enthusiastic about being involved in their lives.

Notes:

Shouta: FUCK FUCK FUCK, I need to warn my husband before he finds out through gossip.
Hizashi: Say what now? KIDS!? THANK YOU, KAMI!
Also Hizashi: Wait, don’t expel them! They might never trust us again if you do that!
Shouta: I can’t hear you.

Izuku: You know what? You asked and you’re technically my parent, so I’m gonna tell you a national secret.
Aizawa: I have CONCERNS. Also, Yagi and I are going to have a talk.
Bye, bye, Mineta. I don’t usually do this, but this version of him is worse than canon. I also wanted his parents to have power, but not be on the school board, so wealthy donors worked.
Hagakure: I feel seen! Do you know how many times boys have made me uncomfortable and the teachers basically told me I should be grateful to get any attention because I’m invisible? Because I can tell you: five. FIVE! You are now officially my favorite teacher ever!
Shouta: Ew, emotions.

Nedzu: I have expelled the worm. Thank you, Shouta.
Shouta: Thanks. Also, YAGI, why does my kid know a NATIONAL SECRET!?
Yagi: Your kid? What? FUCK. I’m dead.
Power Loader: Can I ask what national secret?
Shouta: No. My kid, my business.
Nedzu: Well, see… Also, you can trust my teachers.
Hizashi: I wasn’t the one who told, Shouta!
Midnight: I’m an AUNT! Also, why is your kid’s quirk so fucking weird?
Snipe: Is this the national secret? Because it smells like it.
Recovery Girl: Shhh! Don’t speculate. It’s just Yagi being an idiot like usual.
Nedzu: Correct! But don’t talk about it!

Hizashi being enthusiastic and honest.
The kids are going to have mixed feelings on the ‘new dads’ bit, but all three of them are excited to meet their half siblings. They’ll be good friends.

Todoroki will wonder out loud at some point if Shinso is also Aizawa’s kid, which Shinso will deny.
Hagakure actually has a hero suit in this AU, because fuck that.
Asui might offer her poison for dart bullets against the Shie Hassaikai. Don’t you think Overhaul’s expression would be priceless if he’s suddenly shot with one of those and can’t use his quirk even with Trigger? Her erasure effect poison is strong enough to work through skin contact, just think how much more powerful it would be if injected.
USJ doesn’t happen, because Tenko Shimura was never born. AFO does have alternatives, of course, but he’s sexist, so he doesn’t bother taking Hana Shimura for his plans. Eventually the class does face AFO’s goons and nomus, but that’s a while off and the kids will be much more prepared to kick ass properly.
Bakugou still gets kidnapped and AFO dies at Kamino.
AFO’s ‘successor’ is smart enough not to trust Garaki to work on his body and thus never receives AFO the quirk and Garaki is caught in the raid on Jakku Hospital. The successor joins up with the MLA, but without the experimentation, only has the original Decay and thus is taken out much, much, much easier when the war starts. He lives to see another day, though!
Aizawa does not lose his leg or eye in the war, though he does come home with a few spectacular scars.
Midnight does not die in the war.
Gigantomachia never was defeated by AFO’s successor and thus doesn’t participate at all.
A lot of heroes still quit in the face of the war and faith in the system and the HPSC is shaken. As a result, the HPSC is audited and lots of people get fired, including the current director.

Nine doesn’t fair very well against the combination of Explosion, unblinking Erasure and OFA and is quickly defeated on Nabu Island.
The Tartarus prison break still happens, but fewer villains escape. Among them is Lady Nagant, who turns herself in when Nedzu manages to contact her and offer her a rehabilitation program that will allow her to become a teacher at UA in a couple years.
Aizawa never quite gets over the fact that his kids are all at least a little OP, but adopting Eri mellows him out about it. Eri adores her siblings.
Also, the writing bot decided that this is A/B/O, although I never got around to including it.

This is basically a oneshot. Tell me what you think!

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