We all knew that Hinata should have done this a long time ago. Actually, I'd say it shows something else, from now on, only Hinata is allowed to slap Naruto, because it actually does him some good when she does it.
Yes she slaps him. Why? because he deserves it! 1) He was going to hyperventilate again! "Do lame shit on Sakura's time!" 2) He was about to waste her rare screen time! "I can't afford to waste this time. Every moment is precious!" 3) He didn't remember her birthday! "It was today!" 4) It was pay back for ignoring her confession for so long. "I feel better now. Continue." 5)He didn't get her a present! "...the sex better make up for it later." It better be mind-blowing 6) She wanted to touch his whiskers. "What the hell are these even?!" 7) She didn't want to waste panel space saying "You're being irrational! (and don't start bitchin' 'round me! Wuss.)" 8) It would have to be censored if she had done what she REALLY wanted to do "Let's do it already!" 9) She couldn't stand to see Naruto beat himself up so she did it for him "there, happy?" 10) She secretly thought he was a Masochist that like ppl who were mean/violent to him (if his team and her ignored gentle advances were any indication), so if she did too then he'd love her "Who do you like?!" "Sakur-" punch "Who do you love?!" wipes blood "Ah, YOU, of course, Hinata! ahaha..." "Good."