Dark and Twisted, delves deep into the shadows of the harshest levels of BDSM
An erotica writing friend of mine just published a Dark BDSM Romance novel called Torn. Just reading the description, you'll be able to tell that it's not a Harlequin Romance.
It's short for a novel at about 150 pages (50,000 words), but she writes very quickly (wrote that novel in like 2 weeks), but it's a seriously capturing read.
You know that they've released the 4th book, right?
http://www.amazon.com/Beautys-Kingdom-N-Roquelaure-ebook/dp/B00PV0F0VS/ref=sr_1_1?s=books
Average review is 4 stars right now. I have the sample on my kindle but my "to read" list is VERY long.