Before Steve could even scold her for her apology Natasha was shaking her head, because she knew that it was coming. She knew that Steve would tell her that she couldn't have known, and of course he was right, but a part of her felt like she still should have. They were connected. Not in that ridiculous way that people write about in fairytales, but in a way that partners were connected. When she jumped, he knew to catch her. When he threw the shield, she knew to catch it, it was an unspoken flow between them, a compatibility that came once in a lifetime on the field, and she knew that it sounded ridiculous but sometimes she thought she could feel when he was in trouble. There was a line of consciousness between them that other people couldn't tap into and sometimes it seemed like it went even deeper than just dodges and rolls. There was no way for her to have known.
But she should have known.
It killed her to think about him alone in a place like this, no team, just two young girls that he had to look out for. She didn't like to let herself dwell on it because it tore her apart, and right now the last thing Steve needed was for Natasha to get more emotional than she already was. So instead of arguing with him her hand moved down from his head to the back of his neck, dragging him back in to kiss him deeply once more. It was stupid, reckless, selfish, but she was already in deep. Natasha didn't allow herself to have things, and now that Steve had forced her across that line, she couldn't drag herself back. Maybe if it was something else. But not when it came to him.
"I hate thinking about it," she managed to force in a quiet rasp when she parted again, still close enough for her lips to brush against his when the words left her. "I don't blame you for getting lost, Steve. I couldn't help. No one could, but I can now. I'm not going anywhere." That came with the unspoken 'if I can help it' after, but that was such a part of their lives now it never needed to be said aloud anymore.