(1) You can tell a girl likes you when she dips your ponytail in her inkwell... oh wai-

(2) Never get your bread and your meat at the same place. Don't fish off the company pier. Don't mix business with pleasure. OMG you're being sued for sexual harassment! Need I say more?

Seriously, be very cautious dating someone you work with. It happens; where else can you meet and get to know members of the opposite sex? But there really are many ways for it to misfire, so you need to stay discreet and agree on how things are going to proceed more carefully than perhaps you otherwise would. And if one of you reports to the other, or in the future is likely to, don't even go there.