I also think this chapter is going over if he can actually beat the curse in some aspect. For example the demon girl had to use an alternative because he was fighting against the curse current dungeon level (idk what to call it)
I agree. I hope the the conclusion for this scene is for Naos to at least slightly be able to lessen the demon's power (with the the power of love or something lmao)
Ya. Plus I think the succubus is just embodying the curse. The curse has always been watching and always been forcing them to do sexual acts without their consent. The only thing that is different this time is that the curse has been given a personification and voice through the succubus. It's easier to feel icky about the same thing being done by a character, than it being done by some abstract existence we can't really bring ourselves to blame.
Story-wise it makes sense, demon/succubus has no boundaries whatsoever so consent really isn't something she cares and to her it's entertainment. I don't know if it was intended to be disturbing or not, it just feels icky