Hm... not sure if it's actually been suggested before, but to throw a handful of more unusual TFs into the mix, have you guys ever considered an encounter involving some form of inanimate/object TF? I know there's a handful of latex-related TFs incorporated into the game (which are lovely, by the way~), but I can imagine a few scenes taking things a step forward with the player literally being transformed into a sex toy (or some other object) for a dom to use. I imagine it'd have to be temporary for gameplay reasons, except maybe as an ending, but I can certainly envision the player either willingly or unwittingly ending up in someone's possession for a while. Heck, as another step down the road to that kink, I could even imagine merging scenes similar to the skunktaur-TF scene, but with the player ending up as a more isolated part of the dom... say, as in cock TF or other variants of absorption.
Heh, the more I go on about this, the more weird I sound to myself, but I figure it might be worth bringing up regardless. Who knows, I can imagine it leading to a handful of fun situations should the logistics work out~