How to prevent kins from seeing certain parts of narration

Hello all,

I want to be able to have narrative parts that I don’t want characters to see or read. For example, if I have two kins named Luis and Sandra in a group chat, and in the narration I write “Luis thinks Sandra is ugly,” I don’t want Sandra to see or know about that statement.

I’m not sure if asterisks prevent this from happening. It seems like it doesn’t. I just tried this(using the asterisks), saying that I was thinking of something, and at least one kin read my thought and commented on it!

I read that some people use parentheses for their narrations, but do these prevent kin’s from seeing certain parts of my narration?

Any help is most welcome, thanks!