John can feel the tension mounting in Ianto, and that's what he wants after all. He wants Ianto to moan his name this way, to paw for him, to tense up and then finally let go. Just a little more, maybe, a little more and he might spill over.

He pulls off again to wet his lips, keeps pumping his hand for a second then takes Ianto into his mouth again and tries to work his tongue against him. His hand drifts from where he'd been flexing it into the man's thigh to cup and tease at soft skin, then to reach up and drag nails over his stomach to see if he's as sensitive there.