Um I crave college student Alfred having a major crush on his professor. He's head over heels for the guy, and totally lusting over him. He goes to him after class is over one day and tells him what he wants/how he feels. The professor knows its wrong, but just can't help himself, and he fucks Alfred in the classroom.

Bonus one - Professor previously having really dirty thoughts during lessons

Bonus two - Barely-legal Alfred, who just turned 18 over the summer

Bonus three - Someone sees them.