[The piece of pancake is in his mouth the moment he chooses to respond, forcing him to chew it before he can even begin to get words out, so Weiss is lucky for that blissful moment of silence from Kazuya.

Until he swallows hard, forcing the pancake down a little painfully so he can speak again.]

It is important though.

[Since she said "It's not important" and not "No, I don't want to date him", he's taking this to mean that she does, in fact, want to date him.]

It's one thing if you didn't want to, but if you do have feelings for him, what's holding you back?