A/N This was a headcanon for Megan Green :) I know it's only short, but I hope you like it :D
"What's that around your neck, Lysander?" Megan asked. Lysander looked down and twisted the cork between his fingers.
"It's a charm. It keeps away the Nargles," he said matter-of-factly. "My mum gave it to me." Megan knew all about Lysander's mum, Luna. She was in her History of Magic book and Lysander and his twin brother, Lorcan, spoke about her sometimes.
"Oh, it's very interesting," said Megan, genuinely interested.
"Really?" Lysander said and looked at her with his big pale eyes. "Most people think it's silly." Megan smiled sympathetically.
"Their heads must be full of Wrackspurts," she said. Lysander looked shocked.
"You know about Wrackspurts too?" he asked. Megan nodded.
"Yes, of course. Who doesn't?" You could almost see the spark that shot between them. It was as if the rest of the Slytherin common room didn't exist.
"Do you want to go down to the lake, Megan?" Lysander asked.
"Yeah, sure, Lysander," Megan replied. They stood up and walked down to the lake together hand in hand.