I think it's a longer fic. I only remember a scene where Bruce hulked out and he got away from the other Avengers. Tony went after him on the suit but to calm the Hulk down he had to take off the suit. Tony was really sick or hurt and he managed to calm the Hulk. By the time the other Avengers reached them Tony had put on the suit back and they didn't realize Tony was hurt. Only the Hulk knew and he couldn't tell anyone. Pretty sure I read it on AO3.
Does anyone know this fic?
I wasn't really sure how to label this.
Anyway on AO3, I remember reading this story where evil scientists stole Steve's sperm. The Avengers had to go get it back.
When they got there, however, they found that the bad guys had used Steve's sperm to fertilize Natasha's eggs and a baby (a girl I believe) was born. So they take the kid back home.
I remember in one scene Steve had to give the baby to Tony to watch because she spat up on him. So he went to go get changed. Tony was terrified with the kid. And then I think Natasha was terrified of leaving Tony alone with the kid so she came running out in a towel to keep on them?