Steve and the team make a home in the subway
I recall just enough of this story to want to read it again, but not enough to find it. Steve wants to get out from under SHIELD's control and has to go off the grid to do it, taking the rest of the team with him. He remembers a long abandoned subway station he and Bucky used to play in and shows them there is enough room for them to live there and have a lab space for Bruce and Tony. (Can't recall of Sam was part of the team then.) But Steve declares one of the rooms off limits to everyone else: the room Bucky had chosen for his own when they were children. There are signs that the Winder Soldier/Bucky ghosts in and out of the station, but no one ever sees him. Until one morning when the team gathers for breakfast and Steve yells out to someone to come out and help cook. The rest are surprised to see Bucky come out a doorway and take over at the stove. Steve knew he was there the whole time. If I remember right, this was the last scene in the story. (This was written before Ultron or Civil War came out.)