Right so I saw a discussion on A room for two where people were arguing that Kasumi being asexual meant that she and Sakurako can't ever be in a romantic relationship and let me just say how much bullcrap that is.
As an asexual person it feels like such a huge pressure that people automatically expect something sexual out of a romantic relationship. You can simply be romantically attracted to a person's personality and overall looks without wanting to go down on them.
I hope to have left my small contribution to the discussion that was taking place there.