Daughter of Ghosts

When Black Widow enbarks in a mission back to the Red Room, unexpected things happen.

She comes back, with a kid.

But she's not a normal kid. She doesn't talk, and all Natasha wants is her to not become cold hearted like her.

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Avery Halbergur, a training assassin at the Red Room is given a secret mission.

Trick the Black Widow into loving her like a mother loves her child, only to trick her into coming back to the Red Room instead of being part of the Avengers, because the Black Widow has become a new threat, and Avery would do anything to make her Headmistress happy.