cowgrrl

It was just a sentence or two at the end of one of the episodes (I don't remember which one) which strongly implied Jack and Ianto are more than just friends. It was a funny exchange too, alluding to them doing something kinky involving a timer. I'm guessing there's probably lots of fanfic devoted to that! And the Jack/Ianto pairing was reinforced in this most recent episode: while Owen and Ianto are fighting over whether to use the Rift machine, Owen makes some snide remark about Ianto and Jack's relationship.