That sudden slap explained how timid, shy, and unable Sora is to voice her own desires in one go. If you get pushed down this hard and your life is controlled to that degree... She even expected punishment, seeing her stutter as she protested.
Hmm, is the reason why y'all think it's about to wrap up because y'all are anticipating that they're gonna get her to stay, and then the confession will happen for real, then it'll just end? I suppose I could see that coming...