I have a few suggestions - as you know I'm a ladies man, so anything I say is pure gold when it comes to getting your hog wet.
1) you need music. and some videos. setup a Sweatin To The Oldies TV and VCR combo and then just wear as little as possible - or nothing at all.
Then party party party - you want to have a serious sheen of sweat on you when they come in. Take that as your cue to fire off a big grin and then sexily towel off in front of them. Ideally you get one leg up real high on a table or a file cabinet or something as you are flossing your ass with the towel. While doing that, lick your lips, point at whichever one is looking at you and mouth "YOU" to her.
2) Spend all of your time there with hardcore gay porn on your screen- if there are speakers, crank them up so that you have man moans coming out of them things as loud as they can go. Rub yourself to the images and totally ignore them when they are there - make sure they see that you are far too entranced with the guy on guy porn to be bothered with their under the desk shennanigans (sp?). If they try to say something in gobbledygook, then just keep one hand rubbing the crotch, and raise another finger in the air as if to say "no, please, no talking" - if you really must, press one against the lips of the one nearest you, and then in a moment of disregard, push your finger in and flick her teeth.
(it goes against what you would think - but they will see that you like man ass and be pissed that they can't have you so easily, they will feel rejected, and they will do anything at all to get railed by your love pole)
3) Turn off all the lights. Wear all dark, tight fitting clothing. You are going to need some duct tape. If there are no file cabinets near the door, then move at least one over there. What you are looking for is a height advantage. Get up on top of that cabinet and just stand there in the post of the dude from Karate Kid - but don't scream out "SWEEP THE LEG"... at least not until the ride home that night.
Once you hear them coming, get ready - maybe unleash a good 3-4 feet of duct tape, one end in each hand. When they come in, scream like NatureBoy and drop down behind them, wrapping both of their tight little bodies up in duct tape. This is to get them together initially, later it will turn one on one. Then duct tape their hands to their necks and their mouths shut. Get their ankles up by thier necks and duct tape those there too.
At this point, you can separate them and have your way with them. I would recommend box cutters, some fresh produce, 42oz of 30wt motor oil - used or new, doesn't matter, and a tire iron. If you have matches, WD40, and some orange juice, that will work too.
Basically, you just want to get their clothes off and then fill every orifice with something sticky. If that isn't enough, then make some new holes and fill those up too.
After you are done with them, leave them in someone else's cube with a note on them that says "YOU'RE NEXT"
I can think of other things, but give any of those a try and you are sure to score. If not, let me know and I'll dip into my vast array of hook up tools that I have up in the ol' cranium.