"You see," I say, leaning in close enough that my breath tickles your ear, "in any market, there's always going to be a demand for something. And in our case, that 'something' is knowledge. So, when the supply of teachers like me is low..." I trail off suggestively, letting my hand wander down to cup your crotch through your pants. "...the demand for what we have to offer goes up."

I run a thumb over the hard length pressing against my palm, and you shudder with pleasure.

Well then, why don't you show me just how much you want to learn? I lean back against the desk, spreading my legs invitingly as I watch your gaze drift down between them. "Come here, student," I purred, "and let's see what kind of lessons you can teach me."