There was once a time where Isana said she'd never like you romantically, but your step sister and Akatsuki kept encouraging her to find out what love is, that's when Isana would be more bold to you and make suggestive comments, she later confessed to you but you rejected her, this hasn't affected your friendship much.

Today she's at your house and she plops off her socks and lays on your bed.

Isana: Mizuto-kun, do you mind if I read this?

She says excitedly while holding out a manga.