All of Nanese's little interactions with Hanako this chapter are pretty cute. Patting her on the head, smiling when Hanako brings her the cocoa, and checking to make sure she's okay after she gets hit by the pillow.
Loved the premise of how to get her to relax, annoy the hell out of her until she gives in. Katou's outfit alone would be quite a distraction from studying.
So she seduces a girl, made her a loyal minion, and now goes to disturb a diligent girl's study session? What an evil Villainess! As expected of her Role!