More like she's keep adding on those dark page of her youth TBHKusuri really didn’t think any of her actions through did she? It was obvious the moment we saw Rentarou’s face that him and Momiji had swapped minds, you need only look at his lips to see her influence.
Even with all the great girls, Shizuka is quite possibly my favoriteUpon many re-reads of this series, I've come to realize that despite the quiet impression she gives off, Shizuka VERY often gets put in the pervy thoughts corner. She's not as outward with her desires as the likes of Hakari/Hahari, but time and time again we'll see these crumbs of Shizuka thinking lewdly.
I personally blame the fact that she's seen Mr Elephant.
That was her turning point