I may be very strange, but in this game what calls me the most is to do the opposite of what the succubus wants.
Hey, I can see the appeal in resisting a dark being. I don't think that's strange, just seems unfortunate that it doesn't appear to have much content.
I would say that 99% of the games I play, I do it as I would do irl, morally and that's why I stay away from most of corruption, cheating and blackmail games. This one is different though because of the change, and untill He isn't forced to sell his body, I'll keep playing and enjoying it. If things change and there isn't a path where I can stay away from it, I'll simply stop playing without any problem. It's just not my thing.
I kinda go with how the character feels, in a lot of games.
So if he's a bit of an asshole, I'll play as a bit of an asshole. Or, if he's a nice guy, then I'll make the appropriate corresponding choices of behaviour, or conversation.
But sometimes it's fun to take the nice guy & turn him into an asshole!
As I say, it generally depends on the character & how they're written.
If they do not have a defined personality, then I'll generally apply my own morality to it.
If they do have a defined character type, then I'll often play as that type, to stay in character.
But it's definitely fun to try out alternative choices, like if you've played nice guy then suddenly just turn on someone.
Their reaction can be very funny!