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Sam has been in the bathroom for way too long.
Bucky knocked on the door and after a few seconds without answer he entered in the room.
Sam was in the shower, leaning against the wall.
Bucky looked at him for a long moment, taking in the slump in his shoulders, the slight trembling of his frame, then he stripped down and joined him.
Sam startled when the cold metal hand touched his arm before sliding over his chest, pushing him against Bucky.
They stayed like that for a while under the cold water. Losing Steve has been a hard hit for both of them, and the zombie apocalipse wasn't really helping to keep their morale high. Carefully, Bucky began cleaning the grime and dirt and blood from the other man.
When he finished Sam turned around, pressing their foreheads together, and murmured:
"So, it's just us now".
In the next six days they rarely left each other's eyesight. Days were spent trying to reach New York, where Hope and other survivors were hidden and nights were spent curled around each other, one of them always on alert to make sure they wouldn't get ambushed.
The sixth night Bucky was laying on his right side, the metal hand pressed on Sam's heart, staining his ears both to catch any strange noise and to pick up any sign of distress from the other man, ready to fight or muffle a scream.
When he felt Sam's breathing pattern change it was just a few minutes before sunset. He stayed silent, enjoying the presence of the other man in one of the few calm moments they had anymore, those when he could close his eyes and almost belive that they were again in some hotel room in Europe or in his hut in Wakanda, that he would wake up and see Sam's wide smile, bright as the sun.
Bucky pressed his lips on Sam's hair while he first rays of the sun lighted up the building they spent the night in and then broke the silence.
"If I get bitten, promise me you won't hesitate to shoot me".
He felt Sam tense up in his arms before he replied:
"Only if you do the same".
And so, they made a vow. Bucky hoped he still had time with the man he loved.
They had nineteen hours together after that conversation.
He lost Sam when they were in the Grand Central.
It was almost ironical that who managed to bite Sam and take him away from Bucky was the zombie that has been Steve. So close to their allies Bucky had to watch one of the few person he still had left turn into another one of those walking corpse.
He barely got out of the place after ripping off the left forearm of what has been Sam.
When the sun rised Bucky had found Van Dayne, the Spider-kid and everybody else.
And despite that he was completely alone
"I should be sad"
"Promise me you won't hesitate to shoot me"
"But I'm not"
Sam has been dead since the zombie's teeth broke his skin.
When the Witch threw him, for a moment he was able to fly.
For a moment, he could understand Sam's endless joy every time he strapped his wings on, or really just talked about flying.
Then, before the sun could rise again, Bucky Barnes fell for the last time.