Disclaimer: I don't own any recognizable elements of the Harry Potter Universe
In one of Hogwart's many forgotten corridors, November 1995
Fred and George were busy working on their latest prank product. It was a potion based prank that was supposed to make the unfortunate recipient "catch a cold". However, unlike their skiving snackboxes, the cold was supposed to develop slowly, so that it would look natural. They had all the symptoms right. The runny nose, the constant sneezing, the headaches, the coughing, they had even managed to make it incurable by the normal pepper-up potions; anyone who had been slipped this potion would have to wait a full three weeks after the symptoms peaked before they would fade. The only thing they still needed to do was stop the symptoms from appearing instantaneously.
"Maybe if we added some shrivelfig,"
"But wouldn't that cause a reaction with the wartizome?"
"True, it might also cancel out the…"
From behind then, they heard a voice, "Cancel out the what, exactly?"
The two jumped and turned around, only to find the only person who had prevented more of their pranks than Professor McGongall and Snape combined. "Hermione!"
"What brings you to this secluded, rarely used portion of the castle?"
She held out her hand, palm up, "Hand it over boys,"
With a sigh, the twins glanced at each other, and Fred handed over the papers that detailed what it was supposed to do, what they had tried, and their plan to slip it into chocolates from a "secret admirer" to send to Malfoy. They had made the plans after watching him bully a few Ravenclaw firsties and had included that as well.
They watched with dread as her eyebrows raised as she read through the details. She began glaring at the paper when she saw the reason for this particular prank. Finally she handed the papers back, "An impressive potions project to say the least. It's nice to see you two finally taking some initiative and trying for some extra-credit,"
Fred and George looked at each other in shock before Fred nodded in confusion, "Er, thanks Hermione,"
"In fact," she continued, "Five points, each, to Gryffindor for showing initiative in potion-making," She nodded at the two and turned to walk away. Right before she was out of the room, she turned around, "Oh and boys, an ounce or two of Moondew drops should do it," with that, she walked away without another word.
The twins looked at each other, flipped through their research, and realized, "Good Merlin, Fred, she's right!"
"We'll have to thank her somehow, George,"
Hermione never did say where she got that Honeydukes's chocolate from.