Got an idea for something - run it by y'all, see what you think:
When playing the game and Pressing Q, you got that menu to teleport and go to the debug zone, go invisible, yadda yadda. What if instead of teleporting to the debug zone, you can go to an "Upgrade Island" kind of thing, but one that has two distinct sides - one pure, one corrupt - and from there pick and choose the powers you want to use.
Purity Side: Everybody's smiling and happy and in their normal clothes (or some semblance of naked) with things like Charisma (replacing Persuasion), Angelic Touch (replacing Total Corruption), and some consumables to get an instant +1 bump to your Purity level.
Corruption Side: Everybody's slightly more demonic (horns, wings, bondage gear) with skills like Domination (replacing Persuasion), Soul Crush (replacing Total Corruption), and some consumables to get an instant +1 bump to your Corruption level.
Here's the kicker - in the middle of the island is where Meridiana has been laid to rest, and when you first arrive you are given the Invisibility powerup. If you choose one skill from Purity and one skill from Corruption, you unlock the not-so-secret "neutral" route, along with a special skill called "Bluff" - basically, you cheat your way into having sex, no magic spells required.
Once I've got a few map ideas down, I'll put up a small demo of what you can expect. Again, this is entirely dependent on being able to get into Nergal's game and crack it enough to change it up while retaining the aspects of what it was meant to be - just with some added stuff here and there.