With his head in his hands, Jack never saw Ianto approach. Rather, he more smelled him and sensed his presence as opposed to actually seeing a physical form. He slides over a few inches so that he was sitting, flush against Ianto. Jack never lifted his head, and never moved outside of the tiny shift in his body. Ianto was the one person he let see the inner Captain; what he was actually feeling at any given point in time.
Jack was not happy to be here and he wasn't happy learning who else had been brought here. A child for god's sake! What did the Management have to prove by bringing Luke? And, well, Jack would have been happier if Ianto was still tucked in their bed back in Cardiff.
Exhaling sharply, Jack lifted his head, plastering a smile to his face that didn't quite reach his eyes. "Well! Isn't this just a brilliant turn of events?"