Timeless

Inspired by the prompt:
"We're in the endgame now: the final face-off between the Avengers and Thanos. In the heat of the battle, someone quickly realizes there's something (or someone) else worth fighting for beyond the Infinity Stones..."
Steve and Bucky have known each other for longer than the average lifetime, they fought in many wars and survived many battles, some within themselves and for one final time the face a powerful enemy.
When the adrenaline runs high and fear has a grip on everyone's heart, somethings clicks, giving these heroes something else to fight for.