Celandine and Oriana are a inseparable pair that love to banter with each other for dialogues boxes. Thank god Dev added the Interrupt option so you can get a word in edge wise. Those two love controlling, especially Oriana who is my personal favorite for obvious reasons. If you have high relationship with her, you can suggest things she can do to you and she is absolute game for it.
I am curious why you think I secretly added a storyline? What exactly happened. Did you piss off Celandine? Usually Oriana is the one who is defensive of her sister and gets mad at players more easily, as I accidentally did my first time. But Celandine, she's can be a bit much with the constant propositions and overtures for sex. What's this about her darkness?
What exactly did you do to make things so bad that the thread of prophecy was severed and you had to reload your save or suffer the fate of the doomed world you created.(Morrowind reference)