...Or have I seen this posted somewhere else with more chapters? Or maybe there was something similar to it out there?

Family Disaster by Cassidy J.
Kagome returns home to find her mother remarried. And, as if that isn’t bad enough, her new stepbrothers are the most arrogant boys in school, anonymous letters are reappearing in her life, and using handcuffs is just plain unfair.

www.fanfiction.net/s/1649367/1/Family_Disaster

Any help you can offer would be most appreciated (even if it's to tell me that I'm crazy ).

I think you aren't crazy. It resembles another story i'v read, its not finished, and theres no remarried stuff. This story seems unique, i've never read anything like it before...
If you find someone who knows where a longer version is, i'd love to read it! It seems to me that this could turn out to be a very awsome story! Lol!
Good luck in you searching!

~Kira