[ What he has in mind is keeping Ianto on his toes, as well as getting all up in his junk. He's more used to going down on ladies and that's what he's emulating here, still keeping to the outside of the swim pants as he licks his way down Ianto's cock, over his balls and lower still. He's not about to toss an underwater salad but why not explore while he has the luxury to. It's not like Ianto can really complain too much about it. ]