真面目なので本人に確認を取っちゃうヤンデレのような何か
断るとこの世の終わりみたいな顔をするけど食い下がったりこっそり監視したりはしない

A Yandere that's serious enough to take the initiative.

If you reject her, she'll look like her world just ended, but she probably won't start stalking you because of it.