Wow. You guys need some lessons in flirting. She's flirting with you and all you have to do is tease her a little bit. Hint at the fact that you want to fuck her brains out, but don't say it outright. Don't be boring though and say something like asking her to have a drink with you because that's not going to excite her and your goal is to excite her and get her juices going. Make some suggestive comments using innuendo and mystery.
Quote:
I texted a girl I work with earlier. I gave her some pretty easy jobs to do at work today and she said in a text, "Making you a cup of tea was an ace job! You can give me that job again anytime!" So I said, "Damn right! You can be my slave... I mean secretary. Just don't tell anyone, they'll get jealous!"
She responded, "Sounds good to me. What do I get in return?"
"You get to wear a little french maid outfit

"
Not too much, but not too little. Doesn't say anything that you can't just smile away mischeviously and say that your excuse is that you're encouragable. Yet at the same time, you both know exactly what you're communicating and if the next time you see her you give her that knowing little smile, now she's got something to think about. Something that if she's interested, will start having her think about her being sexy for you and if she's into you that will slowly grow in her head.