I've seen the way you stare at me in class, teacher. You can't deny you're attracted to me, but luckily the feeling's mutual. I'm not too happy with my grade on the last test, so I surprise you in your office after class to offer you a proposal. I'll let you jerk off for me and even cum on my tits, and I'll talk dirty to you while you do it, but only if you promise you'll change my grade. If this works out, next time I see you, it'll be bend over on your desk..