Touch No One by Joseph Hirsch

Body Modification is nothing new in Schengen City. Even Detective John Moglich has a cybered arm, on account of being shot by a punk with an auto-shotgun back when he was a cop. Naturally, when Detective Moglich is given a hefty sum to investigate the attempted murder of a woman with more than her fair share of mods, he doesn’t hesitate.

As he gets deeper into the investigation, things get weirder. He discovers a fetish subculture centering on the worship of the female breast, and the conversion of its milk into a pain-soothing drug. The milk may be poisoned though, since those who drink it are dying in strange ways. Even worse is the discovery that those who taste the breastmilk are also found to be carrying an ugly parasite in their blood. The bloodsucker is half-monster, half-machine, and Detective Moglich must find its creator before it’s too late.