we'll never die (we're like diamonds in the sky)

As opposites go, sickly, skinny Jane Foster and snarky bombshell Darcy Lewis are at the top of the list. But when Darcy saves Jane from a bully, they find common ground and are fused at the hip ever since. Together, they take on the world, until war comes knocking and they answer. [AU where Jane becomes Captain America, and Darcy becomes the Winter Soldier]