I dont' have any resources to speak of for you but I have thoughts.

I think the dynamic is there and is a very easy one to get trapped in. With one needing the blind devotion and almost idolatry and the other needing to put someone on a pedestal, so to speak, I just dont' think it's an uncommon thing. I, myself have not ended up in a romantic relationship such as this but I can see it happening.

I do, indeed sometimes end up with friends that are somewhat narcissistic though and it seems to work at first but for me at least, after awhile I tire of their endless self focus and self praise. I think it's what attracts me to these people at first but after the "new car smell" wears off, you start to see the real person and how they may not be really so great as they tout themselves to be.

As for easy prey. referring back to the beginning, I wouldn't necessarily call it that. I mean that kind of implies that a narcissist by nature is a predator and I don't think of them that way. The other thing is, the same as a narcissist needing one's adoration and unrelenting praise, the bpd also needs someone that will give them that focus so it's not really like the Narc. is preying on them but that it's a dynamic that works in both directions --- albeit only at first.

Idk if I'm being helpful or not but this is a good post... good to think about.