She was weak.  Although she struggled, there was no need for a quick kill.  She wouldn't get away. 
He slid his knife down her body looking for the perfect place to begin.  He could enjoy the luxury of torturing this one.  Already he was feeling excited.  This one would last a long time.  Oh yes, a very long time...

“Please, Mister,” she whimpered. “I'm doing' no harm to nobody.  I'm just out to give a good time to anybody that wants it.  Please, Mister, don't kill me.?”
Her voice was soft.  Not loud and brassy like he expected.
“Shut up.” He ordered