Jealousy + Protection
Just because she was kind of Steve's girl - was she? Bucky had no idea and vaguely drew his own conclusions - didn't mean he thought he needed to do everything to glare absolute daggers at anyone who glanced in Sharon's direction while they were out in Madripoor.
Yet here he was, sitting beside her in a restaurant doing just that.
She was picking up food for them. Sam and Zena were doing something and she offered, but Bucky refused to let her go alone. He just followed her, even when she insisted it was fine. It wasn't though. He really didn't think any woman walking around on her own was the safest, he heard stories.