Very plausible. Sometimes this happens to people who grow up with family who have cluster b personality disorders. It's like they're conditioned to be good partners to people who have it. Ask me how I know.
Like another comment said, sometimes you can just sense it, but often enough they will just tell me. I have heard so many stories, frequently about sexual assault by a family member, from someone I had just met or barely knew.
I have a similar thing. People just open up to me, but my parents aren't abusive. The worst punishment they gave us was to write a research paper on why what we had done was wrong.