Is it accurate to say that this is primarily an NTR focused game? I'd like to know before I bother to download it. If I do so and I opt for the romance path, will I be disappointed?
Not really. Tbh each of the routes look pretty short from what I've seen so far so I suspect it could feel that way though. There's a toggle at the start of the game that will disable any real NTR choices. No matter what though you aren't the only character getting laid. If you turn down Ann it's possible to see her hooking up, Vanessa will sleep with her boyfriend and cheat on him with guys other than just you. I wouldn't call it an NTR focused game and even as a massive NTR hater I don't feel like the NTR gets thrown in your face but I could see some people feeling like it is.
The romance path with Ann is a little short on content but it's sweet. You do go all the way with her so you won't be blue balled on her romance path at least. Her corruption path is still loyal, probably worth playing through and has a bit more content. Haven't tried Vanessa's romance path but she's a slut and I could see her path turning off the romance fans. The choice for whether you go romance or blackmail with her is whether or not you decide to look at a photo of her cheating on her bf sucking another dude's dick. I guess it's a little much but if you can stomach that render then you should be fine with anything else you'd see from her.
Anyway as a vanilla player I think the game's pretty good. Even if you don't want to touch Vanessa it's worth playing for Ann imo. Hope I gave enough info to decide anyway.