In the end this is ero game so this is expected to see some naughty stuff there - and of course will be.
But i recommend to drop expectation that this game will follow typical ero game scheme of "Fallen Angel/Corrupted princess" which means (specifically i'm saying about main character) she won't be "completely owned" or end as "submissive doll"
Regarding the side characters this is different story and it will be heavy depends of your choices and their personality.
First it will depends what you say to her and how you treat her - that's first "corruption" but secondly her own "personality" needs accept that - and definitely can say that some girls WON'T accept some "naughty" activities ever - no matter how deep you will force/suggest her to do.
But let me keep that as secret which ones. Plenty of girls coming next updates and they will be different from each other :)