In regards to the affection thing, the relationship between Sakurako and Kasumi is very close (unnervingly so at times) to the one my boyfriend and I have, ignoring the fact that we are late 20s gay men and not cute anime girls. To avoid just filling this comment with a small essay on the parallels, the relevant part of the comparison is this; I (the Sakurako) come from a very touchy-feely family, lots of hugs and kisses, lots of "I love you's" Whenever we say goodbye or hello or whenever, which leads me to want to be attached to him at basically all times. He, on the other hand, comes from a much more reserved family where skinship and overt affection was more reserved, and he often feels like he has had enough, or more than enough skinship and affection between us just from what I give him so he rarely shows me overt affection unless its something special. Which is all to say that, given Sakurako is even more pushy and clingy than I am, Kasumi being exhausted and lacking the or desire energy to return any of Sakurako's overt displays of affection doesn't actually say much or anything about her feelings.