Their still is paralells between the Huntress and Naho. They both are willing to fight the Dragon. The both Hate the Dragon simply for being a Dragon. The Huntress obviously has reason to hate him. Nahoo only hates him because of the Moon/Sun religion that is never really explained as far as I've gotten.
This Parralel is reinforced by the writers, when Naho tries to kill you with the Assassin's blades if you. No they are not the same character, they each have their own stories and I'm not saying they are identical. Just because they are two of them that are "strong" female characters.
The biggest thing with the Huntress is that you get a CHANCE to prove your not who she thinks you are. And you have to prove you are not Cruel.
Nahoo thinks your a Sun Cursed Wyrm driven by your Dick. And you get nothing plot wise to change her opinion. The only options you get are how to Rape her.
I agree, I don't think their is anything you can do to her in prison that would make her submit.
That is why I think you going to need a "Charm" option as well. Like you get the Option with the Huntress. You need an option to Not treat her like a sex toy.
Currently Naho writing feels unfinished. Their is a scene between Nahoo and Issa where Isa poison Nahoo and instructs her to behave. - Nothing comes of it.
Naho also has another scene, when she is in heat and you choose to take her, she somehow gets the advantage and then rides you. This does suggest how near impossible it is for Nahoo to resist this urge as one of her instincts. As Naho in ever other mood, would and should use the chance to press the attack.
And again their is no follow up. Both scenes seems to be completely forgotten.
Also if you choose to take her Anally, she also cries for mercy and claims she submits... Again another scene that seems to be forgotten after it happens, as at that point all her scenes simply repeat.