Hi Winkey, the "bad ending" you describe would probably fit in better as an alternative ending for Natla's Revenge. I've done a Natla, Mary and Sam ending, so I'd probably use that for the Sybil Ending. I teased Lara having her Title and Estate stolen from her by Sybil in the other endings, so it would be perfect here.
The original idea was for Sybil to be the new Countess of Abingdon and Lara forced to live her her old house, but as Sybil's maid. That's essentially what most of Voluntary Enslavement is about, hence why I haven't bothered to do the last ending for Natla's Revenge up til now; but I like the idea of Lara becoming property, because bitchy Sybil thinks that even indentured servitude is too good for Lara. She wants Lara to be her property! Also, unlike this story, that story had forced bestiality in it (see the Sam ending and the Mary ending), so Sybil could get Lara some friends to play with.
I want to finish the current story first, but I'll get to writing the Natla's Revenge alternative ending next. Good idea - cheers!