Turns out she's just a bit of a Tsundere, how adorable.
Also her face as she buried it in her pillow on page 10...I just really like it, for some reason.
She looks so cute in that frame. Same for the one on the last page.
I think his interpretation is perfectly valid, too. She wasn't telling him to drop dead because of the fact that he was being flirtatious, she was just jealous that it wasn't her he was flirting with?