1) Yeah...demons, the guys which are all about chaos, curruption, murder, slaughter, torture and eternal damnation.
Or for incubi/succubi that they would rape, torture and skin their victims alive (and not necceserialy in that order, or all at once) before having the victims soul as a nice meal....i think we can safely rule out what they classical/ inherently are, those aren't that, at all.
Actually they are worse, those are just some cock hungry bimbos, could have used normal whores it would have made no difference and the timed prostitution contract they already have.
On the other hand, a redemption arc and romance for a 'classical' succubus could have been quite interesting, if good written.
Was my favorite character and romance path in the latested Pathfinder game.
2) what do you mean with her being loyal to her bf...she obviously has no problems or even a bad conscience to fuck anything what moves.
Beside that, i see no point why i would want to make them ''mine''... it's like you want to steal a meal from a homeless kitchen, you would have given one when asked anyway and the meals are served to anyone...
3) I don't think anything of that was mentioned in the game...and we have already ruled out they are classical demons in any way, nor classical succubi with the porn cliche of needing cum.
But going along with that line of thought for a moment.
You want to make them yours, make them love you etc but alas their very nature, what makes them demons/succubi in the first place makes them sluts...how do you want to archive that, change their entire nature, seems unlikely to say at least ?
4) Yeah, but to steal something it would need to have worth, they are worse then street hookers, the MC is a walking dildo to them. I also don't see the MC doing it, cause he can't have any romantical attachment in the first place.
To add to
TsubameYui post.
Yes, it felt like bait and switch and i have no problems with LI's not being virgins (thought it is what would have made sense listening to the games explanation)... but i have zero interest in sluts. The girls constantly ranting about all the dicks and other guys they had is an absolute turn off and something which lets me ignore said LI asap, also a nice way tu ruin a sex scene...
Yeah, what they did to the MC to keep him away from the only LI which actually has any worth in this game pissed me off, but i agree, the good ending was nice and had some content. I consider the game completed with that.