in the case of Yandere Rinny, cannonicly, is her "true succubus" form actually like a split personalaty, or is it just like... a dramatic boost in her true feelings for Lust Doll. cause last time i played just when that form was first accessable outside of the quest, Rinny herself mentioned/joked that it's like she has a split personalaty. i just want to confirm a suspicion here, cause in the case it really is a split persona, how is that even possible? cause becoming a true succubus means accepting the queen's love, as other true succubi and even Lust doll are fine when turned, but Rinny goes total bonkers and basicly just becomes a full on Yendere as opposed to her usual sweet and kind demeanor. again, just spitballing here...
(Forgive me for such a long reply)
Probably because rinny tried to betray the queen. (Dalogue reference to the queen's dream quest). It's always common sense to not defy royalty so maybe the queen gave rinny some kind of punishment per her disobedience. As far as I know, for succubus, their queen is basically their "god" in a sense, this is further solidified when you accept the queen's love, she said "all succubus will return to her after their death" or smth.
But instead of straight up killing rinny (cuz that would be boring) the queen gave her a second chance (Again, dialogue reference to the queen quest) which she accepts and thus, yandere rinny was born!
As to why the queen gave rinny a second chance, she probably saw that rinny has such strong bond between lust so she puts us in the dream trial and so on.