Tony can't read the look on Rogers' face, but then again he can never really read the super soldier's expressions. He guesses it doesn't really matter. He's just trying to do something nice, especially as he knows his attitude irks the more reserved Rogers and they'll need to be able to work together, in harmony, if they want to return to their adult bodies.
The sooner I'm myself again, the better, Tony thinks as he flashes a reassuring smile at Rogers. At least he hopes that's the vibe he's giving off, because usually he just exudes cockiness and superiority. He's even ninety-seven percent certain that believe he's made of cockiness, superiority, and narcissism. He knows better though; it is all just one big act, put on for the onlookers and the press and anyone who might even want to get close to him, although Tony doesn't see why anyone would.
He shakes his head slightly, dislodging the thoughts from his mind and focusing once again on the situation at hand. He has to get Rogers out of here. That's the priority at the moment. "We're gonna go do..." Tony thinks for a moment, trying to find something that would be totally uninteresting to babies so that none of the other would follow him and Rogers. "... Important things. Yeah, important things." Not his smoothest moment, but he blames it on the transformation. He turns his back to the rest of the group, pressing the palm of his hand to his forehead. Yeah, that wasn't smooth at all. Still, perhaps none of the others would notice.
He pulls Rogers a little closer to him protectively, making sure that his coat jacket is staying in place over the other boy's small, thin frame and gently pushes him towards the door, walking side by side. He gives one last glance backwards before they cross the threshold to what Tony sees as safety.