Apologize, and attempt to reason with him.

Taking a deep breath, channeling whatever zen I had left from this morning, I put on my best act and looked him in the eye. "I'm sorry, Sean. I have had a stressful week with graduation coming up and finals just finishing. Can you please take a look at my record and make sure that there isn't some sort of mistake that was made?". Fuck that hurt just saying it.

Sean rolled his eyes in his usual smug manner, then walked over to the desk and started typing away at the computer.
"You did well on the Q&A/multiple choice portion of the exam, but the essay - I mean - did you even try?? The essay you wrote was boring and sterile. It was about as interesting as watching paint dry. I have read furniture assembly instructions that had more creativity than this crap!"

I could feel my fists clenching and my face turning red with anger. Sean seemed to notice and started to look nervous now. "Well, there is one thing you can do for me, if you are serious about getting a good grade in this class."

"What is it you want, Sean?" I asked, using all my power to keep calm.

"Lisa. She and I were close before you came into her life. She was about to be mine, then you stole her from me. I want her back."

I laughed. It was an honest reaction. "She isn't a commodity! I don't own her. She is with me by choice. It isn't gonna happen."

"You can break up with her..."

"Sorry, not going to happen, Sean."

Sean's smug expression finally changed to a child-like pout. "Fine, then why don't you get her drunk or something and let me have my way with her, then we both get what we want." The rage came roaring back ten fold. Sean immediately saw this and said "just kidding, I didn't mean it. "You are a sad, **** little man, Sean" I sneered.

"Fuck you, if I wasn't cursed with being short, she would have been mine. It's is not my fault that I got dealt this shitty hand. You have it all, perfect girl to fuck at your whim, you will probably have a kick ass job waiting for you when you leave this fucking place. Everything is easy for you. I haven't gotten laid in over a year, and it was a one night stand with a girl that looked like more a gorilla dressed as crack whore. The only action I have gotten at this school lately was making some Freshman pledges blow me during rush week - and it wasn't even good." He looked like he was going to start crying. I had no idea that he was so sad and lonely. Fuck it was easier hating him - now I... actually feel... sorry for Affliction T-shirt wearing asshole? Fuck.

Sean suddenly stopped and looked up, "look, you are right. Lisa chose you and I hate you for that, but there is nothing I can do about it. I tell you want, my final offer." He hesitated for a moment, then spoke " I want you to...."
there was a pause...
"You want me to what?" I said impatiently.
"I..um.. want you to suck my dick and I'll change your grade back for you. But you have to try and make it a good one."
"What?!?!?"
"You heard me" he said without as much as blinking. He was serious.