He lets out a soft noise, almost a chuckle, his eyes darting to the side as he follows after her, going about helping her prepare the sandwiches as he grabs some bread from nearby.

"Better safe than sorry." That's how he goes about anything these days. Better not risk it much, better not get too close. He knows what it's like to let his guard down for just a moment, and see the people around him getting hurt - the people he cares for, those he trusts. He'd almost done that to Natasha, if it hadn't been for Thor.