BBEEN WORKING WITH THIS GIRL FOR A FEW WEEKS NEED SOME ADVICE?

so since i started working I've really been gettin on with this co worker, whenever she's out on her break we're talking and stuff earlier on we were talking about sexual stuff and the kind of things we both like in bed, whenever i go to her workstation she touches my arms, back even my hands and I've physically picked her up a few times for a joke. after all this she's got a boyfriend, i still haven't asked for her number as dont wanna come across needy neither make it awkward at work. Answers would be appreciated.
BBEEN WORKING WITH THIS GIRL FOR A FEW WEEKS NEED SOME ADVICE?
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