AU idea: Izuku gains a sibling

In this AU Inko is secretly dating either Toshinori or Aizawa (I might make this into a parallel fic thing where I have this AU going in two books. One would be AiInko the other would be ToshInko)

Izuku has no idea about her dating his teacher, but he finds out when Inko sits him down and asks (Shota or Toshinori) to come into the room.

Izuku is obviously confused by this because why was one of his teachers in his house?

Inko says they need to tell Izuku something. They just come out and tell Izuku that they have been dating for a while now (I could make this the 'Izuku doesn't vibe with All Might dating his mom' fic as well)

Izuku is shocked, to say the least, but he's happy that his mom is happy. And then there's more that they need to tell him.

---

"Izuku. There's more that we need to tell you." Inko addresses.

Izuku looks between the two a bit confused, What else could they need to tell him, "Ok?"

Inko takes a deep breath. (Toshi or Shota) Grabs her hand and squeezes slightly for support, "Izuku, you're going to be a big brother soon." Inko finally says with a nervous smile.

It takes Izuku's brain a second for him to comprehend what she just said, but when he does his face splits into a gigantic grin, "Are you serious‽ Mom your actually pregnant!"

He gets up and hugs his mom tightly. His mom had always wanted more children, but after Izuku's father left she focused on Izuku.

Izuku himself has always wanted a sibling or siblings. It's the reason he's so great with kids is that he has always wanted to be an older brother.

----

When they tell Izuku Inko is just entering her second trimester (About four months in)

Inko and (Shota or Toshi) decided to have the baby be a complete surprise as to what they are when they are born.

Izuku goes to school the next day and is just vibrating in excitement and happiness.

The class asks what's up and he tells them about everything (He got permission beforehand to do so)

-Suggestions-

if it ends up being InkoMight (Inko x Toshinori since that's easier to write) this is what I think would happen:

Deku: So my mom is pregnant!

Bakugo: Deku your dads gone, how did Auntie get pregnant?

Deku: Well, I only learned this yesterday but, apparently my mom has been dating Toshinori Yagi for a while.

Uraraka: Who's Toshinori Yagi?

Deku: ...

Denki: Who is it Midoriya?

Deku: ...All Might.

Todoroki: I FUCKING KNEW IT!!!!!!

Deku: TODOROKI NO!

Todoroki: TODOROKI YES!

Uraraka: What's he talking about?

Deku: ever since the sports festival Todoroki has been saying that I'm All Might's secret love child...

Uraraka: okay.