however after skimming through the latest chapter I can't help but wonder has this become a full on NTR comic?
Well, ppl speculated it's just a move to please his high tier subs, coz as insane as it sounds, there's guys who pay PS 26/50/100$ (!!) for his porn comics. Judging by the fact that this 'sudden' change in the direction of the story happens in Ch9, it could be a possibility. Since PS makes ~7k per month after going down that path, you could speculate that other sex scenes involving Brandi will play out just like or 'worse' than this one in Ch10.
Is the mom basically that other kids whore and she gets passed around and has trains run on her while the son is forced to watch helplessly?
Nah, not yet at least lol.
I don't get the sudden change of heart?
Maybe money really is the 'issue', don't know. But yeah, Brandi did a complete 180 in this chapter, especially with liking the rough treatment. She's on the island for 4 days and she already acts like a slut. Imagine what will happen with her after the 2 weeks are up...

I saw someone say it could be just to add some drama and they'll reconcile
Yeah, the usual "let's add drama for the sake of having pointless drama where it's not needed just so we can stretch out the story" bullshit. Can't do anything about it if his supporters are ok with it tho.
but wouldn't the same thing happen again when the mom inevitably has sex with the giant dick guy?
Dylan will probably commit suicide or go on a rampage like Trevor in GTA V lol, so I'd rather PS gave him one or two hoes he could fuck while that other guy fucks Brandi's tiny brains out.
Also did he not just basically rape her? She says no and stop a few times but because he assumes she's enjoying it he continues on? That's definitely rapist mentality.
Well, you could say it's borderline rape given the circumstances, but I think Rory's approach is just the usual NTR "friendly" rape bullshit where the woman is against it at first, but after the first 2 strokes she falls in love with her "rapist". Originality and realism at their best, right ??
So basically wondering if this is currently/will become a full on NTR thing?
That's the million dollar question right now. So far, PS's answer is a NO, supposedly the next pages will
prove that Dylan ain't no cuck and the story will explain why Brandi did what she did. Personally, I'm calling bullshit on that, but PS holds the power here, so let's how that works out for him.