Master of Pain by Wrath James White and Kristopher Rufty
Melanie has always been attracted to assertive, dominant , alpha males. She has always been curious about sadism and masochism, bondage, and submission, but when she meets a man on an online BDSM website, who calls himself SLAVEMASTER, she will experience a level of sadomasochism that goes far beyond safe, sane, and consensual. Inspired by the true story of America's first online serial killer. From the twisted minds of Wrath James White and Kristopher Rufty, comes a story of extreme violence, sex, perversion, and the occult.