I feel like Naruto's reaction will depend a lot on context. If he wakes up while Sakura is still giving him CPR, I think he'll be extremely shocked and blush a lot; he'd take it the wrong way and think she actually kissed him. That has a lot of potential comedy in that route when you see Sakura's reaction to how he interprets it.
The other option is that he's just told that she gave him CPR and how much she did to save him. Like option #1, Naruto will be very shocked (possibly blushing a little). Then I can picture him getting a little smug and start making flirty jokes about that which will really annoy and embarrass Sakura, but then I see Naruto getting serious about it and thank her in this really sweet, intense way.
I can't wait for him to find out ... it's going to be a really funny/emotional moment.
Edited by xxRomanceGirlxx, 11 February 2014 - 07:54 AM.