Hello. You can find the information that I can and want to share on topics as the one you mentioned in here: https://jpk-vns.itch.io/the-missing-part/devlog/843987/the-missing-part-from-sta...
How the realationships will turn out in the end is something that I consider a spoiler and because of that won't make public, I'm sorry. If this is important for you then the answer at this point in time is no. No harem.