A few years ago I read this fanfic. I don’t remember like a lot of it but I would love to find it again. I pretty sure I read it on fanfiction.net
I just remember that Steve and Tony are in a really loving relationship and they adopted a daughter. I think she was in a hospital Steve and Tony funded or something, I’m not sure. In the story the daughter has already grown and she began dating Loki. Tony and Steve don’t feel much for it of course, but need to overcome their differences and accept their daughter’s choice to date Loki.
I really hope someone can help me!