Y/N x avengers 19

Intro Your Allison you were in the red room in 1930s and were sent undercover in the SSR to get information for hydra you made friends with steve and bucky and peggy you fell off the train with bucky but die to you being injected by the black widow serum (basically knock off super soilder serum you still age) you went back to hydra after recovering and they started giving you doses of the close but not supersoilder serum so it mixed with the black widow serum and you cant age so one day in 1951 your sent on a misson to assassinate someone you walk through the alley and someone points a gun at you and its peggy shes suprised thought you were dead but she takes you in and convinces you to be good so you join SHIELD and your a level 9 clearance so you spent your years working for shield you were there when barton joined tony became iron man and when natasha joined shield and when steve unfroze you obviously joined the avengers when the battle of new york happened Natasha, steve, tony, thor, clint, wanda, bruce