Of course she'll say she joking etc.
What's wrong with this girl? She's neither normal nor good girlfriend, cause she is fuckin tsundere for no reason. He obviously likes her and acted all flirty during date, but she flat-out shot down all his advances and then has some nerve to call him dense! Wtf? Even damn sadist girl is better than this shit, let alone senpai.
You know what kind of development would be really entertaining? MC manages to find Cinderella he is unhealthy obsessed with, but she turns out to be some ugly-ass landwhale with super boring personality, but non-pervert and with pure love for him.