It had been a strange few days. For all that Tony was trying to reassure him that Andrew would ask for what he needed, and that Steve ought not to try and 'parent' at all, it was hard to let go. (Or so the Captain assumed the advice went, as he still wasn't sure he understood what his colleague was trying to say.)
He and Jean were going to have a child someday. Perhaps it would've been easy to be laid-back about the whole situation had they already been married, but the relationship was still so young, and Steve was an old-fashioned kind of guy. He liked for things to happen in a linear order. Courtship. Marriage. Then children.
Unfortunately for him, he was living in a modern age and things rarely went that way any longer. Tradition had given way to a thousand kinds of family.
But when he heard the knock, Steve did his best to wipe it all from his face. He cared about Jean. He did want kids some day. Surely the rest of it didn't matter as much; what was meant to happen would happen.