looking for a story I forgot the name though

[kbuschmm]

I was reading a stroy about a brother sister, mother, and the sisters friend. I wanna say it was calle something like "there can be only one" or something. The boy was blackmailing the mom and sister into having sex with him, and the sister and her friend into having sex....If you can remaber wheat it was called please let me know...Its been a few years but I wanna finish reading it.