The whole of the Konoha 12 were laughing heartily at Naruto retelling the story of Tsunade's angry breakdown, all except him. That freaking Shino Aburamae. What, do they bore him? If they were so boring, why doesn't he go off by himself and entertain himself by himself with his own two hands?! Wait. She thought. That sounds wrong. Well, like she gave a damn! Why wasn't Shino showing any... Emotion? Sure, the rest thought it was normal, but it was not! Surely the Aburamae felt SOMETHING right? Doesn't it bother anyone? That he never laughs, never smiles, and most of the time keeps quiet.
Sakura had been having an obsession over the mysterious ninja for the longest time. It frustrated her that that ninja, that DAMN ninja wouldn't laugh, wouldn't even give her a damn SMILE. Okay, she was plunging into another Sakura rant. But grr.
And his smile, oh just thinking about it gave her the butterflies! She couldn't really imagine it, but she wanted to see it. She had to see him smile. She had to see him laugh. She had to see him being happy, with this cloak of indifference shed from his body! (His hot body)
That's it. She decided. Her desire to see him happy had grown too strong. I'll do it. I'll be the reason he smiles.