I'm trying to find a fics where Tony at a gala/dinner reveals he has adopted Darcy in front of all the Avengers. The two of them have planned it all since Darcy found out that Steve lied to her and went to DC to be with Sharon Carter.
All I remember is that Darcy has a kind of mask that she takes off when Tony makes his statement and she is at a table with Tony, Pepper, Rodney, Thor, Jane and near there is the table with all the other Avengers .
ETA : only a few paragraphs have been mixed from my memories....anyway I found it!
Sorry, Not Sorry by ZombieCyborgAssassin https://archiveofourown.org/works/11858898/chapters/26774748#workskin