jerk one into your hand under the desk, and then throw it at her face. yell something like "eat it" as you throw it. then while shes trying to get your jizzle out of her eye, stand on her desk like a wrestler and then pile drive her.
tie her to her desk, and stick a funnel into her mouth or any wet orphis and proceed to heavy wet and stankily flactulate into the funnel, she will be stunned, and maybe even arosed