something that would also be cool wold be somwone who could "milk" your levels out of you (maby to use/trade for some kind of currency or if a litle somthing relatet to the sigil of Luck is addet and you could lose some ther as some kind of punishment) that would be nice
There is already a hint for that and much more in the kiosk before the capital, the Voltlin speaks about the dangers of the capital altho its not done yet unfortunatley. Also Ancilla is warnin you about the dangers of domination after her 'Helpless domination service' mentioning it so we can only hope that they will implement it soon. Also Treshold keep up the good work we love your game!
That sofia fight got me thinking about that too with the final fight if you lose while penetrated. It'd actually make sense to have some monster girls actually be dangerous that could take xp if you lost a fight. Maybe a route to make petua stronger? Convert your xp to a potion that she can take?
Later down the line, there could actually be true succubus in an area that if you lose you get a game over with your soul getting sucked out or does your levels need to be gone before that can happen?