He returns the hand-squeeze and gives Ianto a quick, grateful smile. And there it is— Ianto coming up with a sensible solution that the rest of them probably wouldn't have thought of. He really loves that practicality, definitely needs the grounding a lot of the time.
His eyebrows threaten to shoot up at just how possessive the arm around Rose is, but he manages to keep his expression relatively controlled, especially once he sees the Doctor's.
"Best coffee in this world and any other." He looks over to the Doctor— or his Doctor?— whatever and chuckles. "Are you ever going to fix yours?"
He walks over to stand on the pavement slab that's actually their invisible lift, and waits there to see how they'll react.