3 months?! holy fuck dude, it should be 3 weeks.
if it's one thing I know, it's sleeping with chicks I work with. you gotta do it hard and you gotta do it fast. strike while the iron is hot. don't give them a chance to mull it over. she'll start thinking about how she shouldn't fuck someone she works with and then her stupid friends will chime in.
hit that shit TONIGHT. spit on her pussy too. they love that