Frankly Ianto's not even sure he can manage something that simple. He's seen Jack's skin flayed open by alien claws and weapons too many times to be able to see anything else. But since Jack doesn't seem like he's going to push for that sort of thing he feels safer about it, and nods gratefully.
"Okay," He replies, running a hand lightly up and down his shoulder. "That was the only thing I was worried about. What about you? Anything you want to avoid?"