Bird's Nest

After leaving Remus Lupin, Allen found the twin brothers in the room that had originally belonged to Ron. After a brief exchange of greetings, Allen's eyes shifted, and he beckoned for the twins to come closer. "Give me the formula for that powerful laxative you dumped by the Whomping Willow before."

Fred and George exchanged a look. Fred pulled out a piece of parchment and quickly wrote on it. Once he was done, he looked at Allen, his usual cheeky grin gone, and unconsciously rubbed his backside as he warned, "We'd already stopped using it. The diarrhea was too severe—way past what a prank should be..."

"Ron accidentally got some on him back then and ended up in the Hospital Wing. My mum charged into Hogwarts and gave us a proper beating." George pointed at Fred. "When Ron was five, we almost tricked him into making an Unbreakable Vow, but dad found out. He went mad. That was the only time I ever saw dad lose his temper like Mum. Fred said the left side of his backside was never the same after that, but after the laxative incident, the right side balanced out with the left..."

"Who are you planning to use it on, Allen? Ron? Want our help?" Fred handed the formula to Allen. "Actually, I still think the left side of mine seems a bit bigger..."

"Let's not talk about which half of your backside..." Allen thought of the scene they had stumbled upon with Ron and Malfoy back then, and his throat prickled a little. Still, he played along and raised an eyebrow at Fred. "Don't let my appearance fool you. I'm still a professor, after all. I wouldn't attack a student..."

"As a professor, haven't you already attacked a female student—ow!" Fred leapt up. "Both