Based on this picture
I
dk what the au is but I'll call it Caretaker au.
"Sero please get down!!" Katsuki shouts at the black-haired baby who's hanging upside down on the ceiling.
Tsunagu(Best Jeanist) follows behind Katsuki, while Katsuki walks towards Tomura who is holding a flower for Katsuki.
Katsuku kneels with Kirishima in his arms, Todoroki crawls over to Katsuki's side.
"Is that for me?!" Katsuki asks small Tomura as he shakes his little head yes.
"Can you put it in a vase for me. It's very pretty yes?" Katsuki speaks.
"Yes" Tomura mumbles going to get a vase.
Katsuki picks Todoroki up and stands up,"Let's feed you guys" Katsuki speaks going over to the babies, Tsunagu following behind.
Katsuki puts Kirishima by Kaminari, leaving baby Todoroki in his arms.
"Wanna go to Deku?" Katsuki asks the half n half baby who's clutching on his shirt.
Earning a nod he sits the baby next to the small greenette who's whining for Katsuki's attention.
"Why are you whining little one" Katsuki mutters giving Deku his index finger to mess with.
Deku happily takes the finger.
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I was in a silly goofy mood.