Please help me find this story!

I’m looking for this multi part story I read months, maybe years ago. Guy marries a girl, and her daughter (18ish) moves in. She seduces him, but it builds over the chapters. In one of the chapters she brings a friend over, described as a sort of goth type chick. The girls blindfold him and take turns having sex with him until he cums in one of them, but doesn’t know who.

That’s all I remember. Thanks for any help!