Fic rec: I'll build a house inside of you

I'll build a house inside of you (19199 words) by magdaliny
Fandom: Captain America (Movies), The Avengers (Marvel Movies), Marvel Cinematic Universe
Rating: Teen And Up Audiences
Warnings: Creator Chose Not To Use Archive Warnings
Relationships: James "Bucky" Barnes & Natasha Romanov, Kate Bishop/Natasha Romanov, James "Bucky" Barnes & Steve Rogers
Characters: Natasha Romanov, James "Bucky" Barnes, Kate Bishop, Steve Rogers
Additional Tags: Kid Fic, Growing Up, standard Winter Soldier trauma umbrella, violence committed by children upon children (mostly offscreen), Epilepsy, Amnesia, Alternate Universe - Canon Divergence, Red Room, Fluff
Summary:

Natalia is stacking blocks very carefully when the adults come into the room. None of them look at her, because they're all looking at her father. He's wearing combat gear, and the hair on the left side of his head is slicked back with blood. He smells like smoke and something unnameable, sweet and dark and a little sickly in her nose.

Father is saying, “Don't be ridiculous. The only thing children are good at is disobeying.”