I wonder if this will have any impact on the story going forward, because I doubt it will - and if it doesn't, why have these chapters and this moment at all?
I often bring up, in these kinds of stories, the interesting body horror of being a possessed/possessor isekai person; like how you're essentially a parasite taking everything from someone, even their name.
However, if the MC simply says
'yeah, I'm possessed',
and the response to this is,
'it's okay, we're still family'...
Then what was the point of it all?