He had been teasing her?!

She had gotten herself all flustered over her first kiss all for nothing?! Well now that just makes her blush all that much harder and she takes a little offence over that.

"You J-jerk!" She snaps at him. "You're not supposed to do things like that! I didn't give you any kind of consent to be so... so casual with me! I might have been saving that for someone else for all you know!"