Steve does not actually sleep overnight. He lies still, feeling the closeness and warmth of the body beside his, and finds some peace in just that, even if his brain insists on quietly going over potential scenarios and pitfalls they might encounter in the next couple days. He can't anticipate everything. Even he and Tony, between the two of them, can't anticipate everything. They'll have to improvise at some point, and possibly have to pray.

Of all the things they might have anticipated, though, the ones they should have considered first and foremost are the fact that their younger selves are both loose cannons.

Rogers-the-younger has been told in no uncertain terms that he is not to discuss his mission with Tony. He doesn't consider himself under orders, per se, but knowing what's at stake here, he feels an obligation to follow the plan laid out by his older self and the older Tony inasmuch as he can. Of course, they didn't bother to warn him that they were going to visit the younger Tony, too (because at the time they didn't know), so he's caught off guard when he speaks to him on the plane.

His eyebrows go up, and he glances at Loki briefly before turning a skeptical little frown on Stark. "What, like a tennis match? I only follow baseball."

Oh, they're going to need to talk this over, for sure. But maybe not in front of the others. Especially Loki.