>>1
Don't bother, One this girl isn't even 18 yet. She most likely isn't very mature. This wouldn't matter if you are just in it for the ass and nothing else, but otherwise. no.
Also, she's someone you met at work, now unless you plan to leave this job soon don't bother. Women hold ALOT of power when at work, she can report your ass and you'll be in one of those sensitivity classes and have a black mark on your record, and may even get fired. And the age difference won't work in your favor either.