He's suspicious

"How do I know you aren't trying to convince me to give you a better mark? Or **** me?" He looks at you sharply. You moan in frustration. "I promise it's nothing like that. I just really need a fuck. I'm so fucking wet right now..." You get an idea, kick off your sandals, and undo your jeans. Patrick looks shocked, but watches intently as you shimmy out of them. You sit back on the desk at the front of the room, and spread your legs, showing off your soaking panties. "Is th-this enough proof-f?" you stammer, blushing hotly as you realize what you're doing. "Look how wet I am. Just fuck me already, please?"

He stands up, meeting your gaze. You can tell he's getting a little flushed too, and eyes dart down to his pants to see if he's getting hard, but it's too dark to tell. He speaks up with an intense voice. "Oh I want to fuck you, alright. But you're going to have to do something for me first." You heartbeat quickens. "Anything. Please."

"I want video evidence that this isn't about grades." He pulls out his phone, points the camera at you and smiles. "Just for insurance." He looks at you expectantly.