This is the series of stories that got me started doing HL fanfic--and all standard disclaimers regarding fanfics definitely apply to these. Particularly ones about me not owning any of the characters except Genevieve, and, of course--language and violence, and graphic sex give this group another nice NC-17.
(Graphic sex, and violence...)
(Ditto)
(For the last two stories--I highly recommend reading the Anath-Sin series, first. They may make more sense. Or not.)