I hope not, because I have characters who appear in one book as POV characters and then they are background characters in a later story...or stories. I'm not sure if we're talking apples and apples though. As in, in my stories, years pass between books and the lovers in book seven are married and their son is a POV character in book 8, but the parents appear in the story, though in smaller roles. For me, that's just the natural progression of time and stories. If your (Brian's) story is like that, as in, book one has an ending and then book two begins sometime after book one ends, I think changing POV is okay. If book one has no clear ending and book two picks up right after book one ends...it could be problematic.
The thing is, one of my favorite series never used the same POV character twice. Piers Anthony's Xanth series had so many POV characters, and the stories spanned many generations, so it was a lineage for a long time, too, not just new characters.
My fourth book is a love story similar to how this one sounds. The young man is the initial POV character and he meets a girl who he has all these weird feeling for, sometimes attraction, sometimes a sobering form of revulsion (because she doesn't fit his fanatical religious ideal of what a woman should be). Anyways, the girl has some secrets, so I don't use her as a POV character until halfway through the book. I haven't really edited the manuscript, but I was always concerned for whether that would work. I mean, did I wait too long to use her? Or should I try to abandon her POV entirely? Some of what her POV shows can't be shown any other way...do I go omniscient? Tricky.
Anyways, I wasn't entirely sure how exactly your two books flowed one into the other, so I tried to give my best interpretation of what I'd consider, anyways.
The thing is, one of my favorite series never used the same POV character twice. Piers Anthony's Xanth series had so many POV characters, and the stories spanned many generations, so it was a lineage for a long time, too, not just new characters.
My fourth book is a love story similar to how this one sounds. The young man is the initial POV character and he meets a girl who he has all these weird feeling for, sometimes attraction, sometimes a sobering form of revulsion (because she doesn't fit his fanatical religious ideal of what a woman should be). Anyways, the girl has some secrets, so I don't use her as a POV character until halfway through the book. I haven't really edited the manuscript, but I was always concerned for whether that would work. I mean, did I wait too long to use her? Or should I try to abandon her POV entirely? Some of what her POV shows can't be shown any other way...do I go omniscient? Tricky.
Anyways, I wasn't entirely sure how exactly your two books flowed one into the other, so I tried to give my best interpretation of what I'd consider, anyways.