We’re kin via reincarnation ^^ ,We’ve shared a body in this life since we were children, and we’re the first system members that we were aware of. The two of us are broadly co-conscious most of the time nowadays, although in the past we were much more sharply separated. However there are still times where one of us will fully take the front separately.

In our life as Fukawa as we experienced it, it was very similar to the above. We were extremely separate and didn’t get along when we were younger, and became more easily co-conscious as we got older (a lot of that was thanks to Byakuya <3). And just as an aside, the sneezing thing that’s shown in game wasn’t really a thing for us. We had different switching triggers.

Thank you for asking, anon!