One day, when Jack was very lonely, as he usually was when no ones around. Except someone was there, Ianto was. Ianto was always there.
Jack knew he could count on Ianto to make him feel better. And Ianto would try his best because he loved Captain Jack Harkness.
Maybe he felt the same way, maybe he didn't, it didn't really matter to Ianto.
Being sneaky, Jack had set up a separate com for just him and Ianto. He used it that day to ask him to bring him some more coffee.
He had a devious plan of seduction that day.