How to hook up with a promiscuous girl at work?

She is pretty easygoing verbally but all about the body language. She rests in the iest poses at work and gives me glances when she pes by, all of which I try to return with looks and b.l. that suggests I'm interested. She's caught me looking at her a** a few times and not minded, even gave an amused look. If she isn't looking to get some then I must be crazy. Either way, I'm in it to win it. So far, I've minded my own business around her compared to other guys at work, who make it obvious they want her. I'm certain she does these things for attention. How do I cut the bullshit and seal the deal? What do I say to not come off as a square and communicate "hey, you and me, ASAP."