One of the Hunted

Steve's worst fear is waking up 70 years in the future again. Tony's worst fear is fucking up his kid's life. So what happens when on the day after their kid's birth, Steve wakes up and it's not the day after? And everyone is gone? With the help of a stranger, an old enemy, and a confused friend, will he be able to find and restore the Avengers? (Not mpreg, OC kid.)