The Lost Potter | HP X MCU

Before the Potter's had Harry they had an older daughter who went missing. That daughter was taken to the Red Room and became the Black Widow. The Avengers get teleported in the Great Hall to watch her past and future while being reunited with her birth family that she know nothing about. Her name Natalie Rosemary Potter? Her name now? Natasha Romanoff.
What happens when real parents don't approve of her life?
Set before Age of Ultron.
I don't own Harry Potter or Marvel they belong to their respective owner. And i don't own the gif or image i'm using.