Emma had been pondering over the question for a while, ever since Hook first revealed who he was. So naturally, at the first chance she is alone with him (well as alone as she could be, Mary Margaret was a few feet away) she gets straight to it.
"So, where's Peter Pan?" asks Emma. The sound of sudden coughing diverts her attention to Mary Margaret who is kindling the fire.
"Hey are you ok?"
"Yeah yeah I am fine," says Mary Margaret looking anywhere but at Emma.
"Uh who?" replies Hook wearily, bringing Emma's attention back to him.
Surely, in a world of princesses, giants, fairies and god forbid – magic there must be a flying boy right?
"You know, a little boy with green clothes and red hair? He can fly and is also your enemy?" The coughing starts again though it sounds suspiciously like something else.
"Mary Margaret are you sure you're fine?"
"Yes, yes just a little smoke"
"I can assure you, in all of my adventures I have never met a flying little boy," says Hook and Emma's internal lie detector knows he is telling the truth.
"Not one who becomes my enemy either" continues Hook with a cheeky smile.
Emma's brain is reeling with this new information, this isn't how the story goes! There is supposed to be a Peter Pan! Well, in this world when did the story ever go right anyway? She thinks exasperatedly.
"Wait…so how did you get your hook?" asks Emma curiously and immediately regrets as she sees the smile leave Hook's face and his expression darken. In the background, she can hear the coughing again.
"Well, that's a story for later" His darkened expression leaves as he continues with a smug smile, "I am afraid Mary Margaret there is going to die from all the fake coughing she is doing"