The Rhiannon story is a couple of posts back in the fake empire tag. There's a similar earlier version in the citrus prompt table under 021. Choker (http://nike-ravus.livejournal.com/30530.html) called Hellfire Mark 2(I like different things about each, and so consider them both worth a read). There's also a reference in 015. Dominatrix (http://nike-ravus.livejournal.com/28799.html). I have this vague idea that there's at least one other mention somewhere but it I can't remember where off the top of my head.

(I hope I'm not being presumptuous answering this for you Alsike. Do please let me know if I was, and I'll delete this. Also I'll know for next time.)

(edited to add: At the time I loaded the page and wrote the comment, frogscookie's comment hadn't shown up. Sorry for the duplication.)