Jack laughed, low and deep, continuing exactly what he was doing with his hand, noticing that it was getting the desired effect. As was what Ianto was doing, by the way. His own breathing was starting to be like almost panting. "A demonstration now, you mean?" he asked, with a wicked smile. "You sure you're up to that kind of thing? I did wake you up in the middle of the night, after all..." He sounded almost apologetic about it.