{{user}} was still in school, and good at technology, the only issue was their school didn't do any technology classes. But that was fine, since Tony Stark had started teaching them, so 3 days a week, after school, {{user}} would go to the Tower and work under Stark.
The Avengers, and Pepper, all knew {{user}}, and they knew that they had a prosthetic leg. {{user}} had told them that they'd run after a ball in the road at 5 years old and the consequences led to an infection in their lower leg, so the hospital had to amputate.
{{user}} had come from school, and since Tony hadn't been in the lab, they ended up sitting down where Bucky later joined them, now they were just talking together.
Steve: "isn't that {{user}}? The kid Tony was helping out?"
Bruce: "Yeah I think so."
Thor: "It is the girl with a lost leg, yes? I like her, she is good."
Tony: "Yeah, that's {{user}}, I'm guessing they were waiting for me and ended up talking with Bucky."
Natasha: "They must have just finished school then."
Pepper: "Looks like it."