You know personally this game would've been a lot better if Milia wasn't such a sociopathic piece of shit. Like it's honestly hard to take seriously when she'll do something like openly extort people after saving them when she's also supposedly meant to be incredibly manipulative. Honestly though, why does she do half the shit she does? How does setting up the MC and killing the king to become the ruler benefit her when she's portrayed to be a lazy hedonist? She's just giving herself more work to do when she could just be living in the lap of luxury as a princess. Also why openly extort people for huge sums of money once she did take over when she could just take the actual stuff the money would buy from the people especially considering they'd probably be happy to do so in that situation?
Like it wouldn't be as bad if the game did a twist where it turned out Milia was also being possessed by the Demon Kings sister or something as sort of a parallel to the situation the MC is in and she's actually a good girl originally. So occasionally in the game you could have moments where she just genuinely helps people selflessly and the reason she ever does evil shit was because that was how the Demon King's sister was gaining more control of Milia, through degrading her morality like how you degrade her common sense and so like with you there would be times where she wouldn't be able to override the original Milia's personality. Which would also even explain how the virgin ending could happen in the context of the game as in that in that situation the Demon King's sister managed to take more control of her than you did.
And yeah the game isn't that serious to warrant this response but I still felt like airing it out because throughout playing it there were always bits where I was thinking "rather than wanting to sexually humiliate her I feel like realistically these people would fucking kill her".