itch.io

I don't think so if you get her just right and make her contact with the tribe broken she will love you drugs or no (I think it has been a minute since I did that playthrough)

At the moment, Naho will hate your guts.

Act 5 has some hints that there's a better way to be with her, and her interactions with maligar hint about some more backstory stuff.
So, she will either get more character development... Or die giving birth.

But aside from that? All we have is speculation, and an angry pupper on aphrodisiacs.