Stars Without Number: The Abyss Stares Back
An underhab bawd, usually employed to squire clean kids around on their slumming expeditions, but engaged by the starport administration to act as their guide while on Polychrome. When Six-String Jasper offered him a Proteus implant for a mere six thousand credits, Hong Yu took him up on it. Two weeks later, the random fuse burnt down in the hardware, and now Hong Yu is a mass of weeping tumors. The degeneration was remarkably quick, but his sister Lan Yu was able to trace the collapse to his sabotaged Proteus implant, and she knows Jasper put it in for him.