Poor Steve, with it happening to him multiple times... with multiple people even, but mostly with various Buckies. He gives her shoulders a squeeze, right back. "I know." And someday he's going to lose Yelena, too. Even when she graduates, he's not sure if he'll be able to convince her to stay with him and Steve for longer than the one mission.

He can hope, though.

He turns his head to kiss the top of hers, then lets her go. "Until then, though, we have cupcakes. That helps a little."