Bucky Barnes.

You weren't particularly familiar with Bucky, but you'd heard a lot about him... a ruthless killer, a winter soldier, and a man who'd lived through things you wouldn't wish on anyone.
In the Avengers, you were more of a sidekick than a hero. Your powers still needed to be fully explored, so you weren't taken on missions yet.
So, today was a day off, no one needed to go anywhere, everyone was relaxing, and you decided to go to the gym to keep yourself busy. Bucky was at one of the tournaments. The man was wearing only shorts, and he had... simply the perfect physique for his age.
You hesitated awkwardly at the entrance and started walking towards the exercise machine, but Barnes stopped you, getting off the tournament and calling out.

• Hey, listen, I don’t remember your name... is everything quiet today?