On a 6-, they tease you.

"Yes, Miss Stevenson."

The girls answer in unison, walking slowly towards the desk hand in hand, making sure you get a good look at their behinds and legs as they walk, sending you shy smiles over their shoulders.

When they get there Lucy guides Julia's motions with soft touches, telling her to arch her back and stick her ass out. Then she kneels beside her, trailing her fingers up and down Julia's legs, which draws giggling sighs of pleasure from her friend, before sliding her hands up under her skirt to slowly, oh so slowly pull her panties down. Lucy carefully folds her friend's panties and puts them on the desk, then kneels again to spread her legs with her hands, both of them looking over at you.

The show has made you enormously horny, and your cock is rising to make a tent of your skirt, something the girls have yet to notice. You need to get off fast.