Disclaimer: Do I look like JK Rowling. Don't answer that... Look I don't own Harry Potter ok?
Come down with a BAD case of Tourette's syndrome during the exam. Be as vulgar as possible.
Slughorn was handing out the potions exam with a little bit of fear. After all, Potter and Black were in this class. He had heard what Black had done to Professor McGonagall and did not want to be a victim. Too bad for him, he didn't really have an option.
Slughorn went back to his desk, grateful that nothing had happened. Then he heard a voice from the class. Potter.
"Hey Sluggy!"
Slughorn winced but ignored James. After all, James was one of his favorite students. "Yes James, my boy?"
"You. Me. Your office after the class?" James said, winking at his teacher.
Slughorn smiled. James merely wanted to spend time with him. Not that he could blame James. He is the best teacher at the school, if he did say so himself. "Of course James. What do you wish to talk about?"
James gave the professor a flirtatious look, ignoring Sirius's laughing, "How to earn an O. Maybe we could do some extra credit together? Think about it, sexy."
See I do look good in my age. Thank you very much Minivera. "I'm sure we can think of something, James. Though if you would just study," Slughorn complained, not understanding why the whole class was laughing.
James stood up and walked up to his teacher and forced a flirty look on his disgusted face. "I'm sorry," James flirted, "In class, I'm too busy studying you." James leaned in and kissed his cheek. James grimaced, disgusted.
Slughorn finally understood what was going on. "POTTER! Report to Dumbledore!"
James nodded quickly, "Great, but can I go vomit first?" With that he fled the lab, leaving laughing students in his wake.