[Bucky considers her answer a moment before he nods seriously. He still feels like he might be a reminder of one of the worst times in her life, but Natasha is the one decide if there's any truth in that beyond his own guilty conscience.]

I knew what I was getting into. [He pauses, makes a face.]

...Except for everything I didn't know. No more lies, alright? At least, not about us. And not to protect me. Anything else... [He shrugs a shoulder.] I trust you.