Lamb to Slaughter by D. Dove

It’s a public service, taking out the trash as Lam does, but would it kill these men to not be so boring about it? Maybe if they weren’t so predictably pathetic, Lam would actually spare one and take him home and keep him. Murder is such a lonely hobby, after all.
It’s a victimless crime, Conan tells himself, and the pretty man across the bar is the perfect mark for the night. Conan has always been able to charm the skin off a snake, and that’s just what he intends to do tonight.
Except Conan’s plan to talk his way into a warm bed never accounted for a run in with a pretty, knife wielding serial killer with a penchant for rules and a desire to be entertained…