He's still dwelling over if Peter Pan is creepy, so it takes a moment for John to process the question. Duel fairies? For Ianto's honour? Why would he -- oh, because he's... Wendy? Right. Yet at the same time, that doesn't make sense. Ianto was his Wendy even before he was Wendy. Ianto his important. Doesn't he know that? Maybe he doesn't. John turns a frown on him and slows to a stop, rests his hands on the man's upper arms and runs them down toward his hands slowly. He's momentarily distracted by Ianto's hands, which he realises he's never paid attention to before, but then his eyes track up again and study him with focused intensity.

"I'd do anything for you," he assures him, "even before you were Wendy."

Just in case the Wendy situation needed clarifying. It seemed important, on some level he cannot fully explain.