Jack waited until Ianto started moving himself before he began to rock his hips along with him. It was hard to get much leverage, especially given their position at the moment, but what he couldn't do in rocking his his hips he did in rolling them. His hand was warm around Ianto's arousal, rubbing the tip as he did, only just moving his hand up and down. His other hand went to Ianto's thigh, kneading the flesh there as he ran his thumb in circles on the other man's sensitive inner thigh.

"I certainly thought so," he said, a bit breathless because of how amazing Ianto felt around him and because of the effort it took not to just start up a rhythm and let it take them away. He was supposed to be tiring him out, after all. That meant he had to take his time, make it last.