Vampire and Vine

A Vampire is a person who preys ruthlessly upon others; an extortionist,

A woman who unscrupulously exploits, ruins, or degrades the men she seduces

Although traditionally used to refer to the bloodsucking undead, you can use the noun vampire to describe someone who heartlessly preys on others — a blackmailer,

Or anyone else who just sucks the life out of you.