This would be yet again one of those situations that the Winter Soldier has no frame of reference for, tensed at the prospect of scrutiny and then looking comically blank as he tries to parse Steve's Steve-ness.
He blinks at the popsicle, glances up at Steve almost too quickly to catch (for permission, always permission before he remembers that he doesn't need any, and certainly not from someone who'd been a target), and then looks back at the popsicle before reaching out gingerly to take it with his remaining hand like it might be explosive, and everything in his silence screams the obvious questions: why are you doing this, what made you think a super assassin would want one of these, did you really have to get the Captain American red-white-and-blue kind, really.
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He blinks at the popsicle, glances up at Steve almost too quickly to catch (for permission, always permission before he remembers that he doesn't need any, and certainly not from someone who'd been a target), and then looks back at the popsicle before reaching out gingerly to take it with his remaining hand like it might be explosive, and everything in his silence screams the obvious questions: why are you doing this, what made you think a super assassin would want one of these, did you really have to get the Captain American red-white-and-blue kind, really.