Avenger's Tower is a big place, and Bucky Barnes (that's what they tell him his name is) is determined to explore all of it. His experiences with HYDRA have left him extremely closed off; he'll say what he thinks people want to hear, try to get along with people and make them happy, then make his own plans and think his own thoughts on his own time. Keep up the behaviors that saved him, keep on what he's been doing all along; now he just has more room and less supervision. He still isn't sure how welcome he is here, or if anyone actually likes him; if he even remotely belongs here. It hasn't been a week since Tony Stark determined it would be safe to trust him with free reign of the place. He's pretty positive he isn't welcome to just poke around wherever he wants, but exploring an entire skyscraper is a goal, with just enough of a 'forbidden' component to satisfy his sense that he's doing what he wants and not what he thinks is expected of him (Steve Rogers, Captain America, encourages him to do what he wants, and he trusts Steve more than all the others).
The logical way to start exploring a skyscraper is to work your way from where you started. When Bucky works up the courage to make his first excursion, he heads back to the area where he was brought, initially. He's wearing a hoodie to conceal his arm, and acting like he's supposed to be here, and no one along the way challenges him, probably no one recognizes him. Good.
To his dismay, he realizes that this area of the tower was built to hold captives. He... he knew that already. But a close look at the measures taken to keep all of the floor's occupants inside their rooms doesn't do his nerves any favors. Logically he can't fault them at all, for making him, technically, a prisoner. Not with everything he's done, all he's capable of, all of the poisonous ideas that still haven't worked their way out of his system. They certainly treated him like a friend, visited often, especially Steve. But if they had to lock him away, it means he failed at something. Wasn't good enough to just coexist peacefully, in their eyes. At HYDRA it didn't matter what the circumstances were; failure was failure. This reminder of his failure is unpleasant. If you failed, you were bad. Less important, less valuable.
WELL. He came here to explore. Face scrunched up into a scowl, he peeks through the window of one of the doors. Empty. A lot of the other rooms are empty, too. Then he finds a room that's occupied, by a man dressed in green, with long, dark hair.
He probably isn't supposed to talk to prisoners (fellow prisoners?), but fuck the rules, letting rules control his life never got him anywhere.
"hi i'm bucky," he says suspiciously, through the glass.
('slice of life' Avengers AU where they all kind of just live in a tower and fight bad guys, and apparently Thor brought Loki here at some point, to try and help him)
