Adult Series that follows friends finding love; heavy trigger warnings and possible spoilers ahead regarding one FMCs horrible backstory. Kidnapped by stepdad/twin sisters at end.

[Kayla]

I am looking for a series that I read back from sometime in the range of 2009-2017. I believe it follows a group of friends where each friend gets their own book/romance. The only thing I can remember is that one of the girls has a horrific backstory. TRIGGER WARNINGS - pedophila, rape, incest.
Her mom marries her stepdad and they have twin girls and the stepdad rapes them when they are very young right in front of her and has them go down on him. She gets away and then towards the end the grown twin girls kidnap her and bring her back to her childhood home where their dad is (FMCs stepdad) . There’s a “graveyard” type thing in the backyard where the twins buried their stillborn children from incest. And I think one of the sons lived but he is not mentally sane.
I think the mom made a deal that the stepdad could have the twins to keep him away from her daughter (the FMC)
This is the only thing I can remember and I have no idea how to even look it up. Any help would be greatly appreciated!

[Kayla]

Bumping in case anyone has read this one