Jack grins behind him at that reaction. "Oh, like that idea, do you?" he teases, setting the lube down and coming in behind Ianto, tapping the insides of his thighs lightly to suggest he wants them spread further apart, just because. He lines his cock up but just rubs it in little circles over Ianto's slicked, pink hole for now. "Next time we're in the library, hmm? Perhaps over that table you fucked me on the first time?"