Ianto doesn't want to let go of Jack either just yet, but he makes himself do it. What they had just done was easily one of their most intense experiences together to date - he was going to leave their first time at number one, but this was a close second in his book - and he is not ready for it to end just yet.
Slowly he disentangles himself, one hand still resting on Jack to keep him balanced while the other gropes around for the abandoned bottle of lube. He squeezes a generous handful onto his fingertips and begins gently working it around the plug in Jack's ass, alternately stroking and pulling gently to work the thing out.