Another Universe.
Technically, a continuation of Your Fixed Point, but not a sequel in the sense that you need to have read that fic for this to make sense. Your Fixed Point followed the plot of IM1 very, very closely. This one follows-ish IM2 and Avengers.
It also takes as canon the novelization bit about Tony re-discovering vibrarnium in IM2.
Why should she fix her father’s possibly stolen, definitely fucked design? Why should she play ball with Nick Fury?
Rated R. 20,600 words. AO3 or DW