First of all, she was barely flirting in that scene. She wasn't flirting, Secondly she could've been pondering when she bit her glasses and Ike just didn't know how to portray that. Thirdly Sakura may have been making googly eyes at Sasuke, but we all know that Sasuke is where she would get the flirtyness from. RTN Sasuke or Charasuke was to be Sasuke had Itachi not kill his parent. And the gag is that he was being very fresh.
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