Greg watched Alfie rub at his neck and he grunted slightly, shrugging as he rose, "Just curious," he said dismissively, trying to down play his interest. The last thing he needed at this moment was Alfie knowing how curious he was about the two of them. And for a moment, a fleeting idea crossed Greg's brain about future blackmail acts, but he set them aside for now; he wasn't exactly sure that he wanted to get that from this vulnerable boy. He decided he'd think about it more later, on his own that night.
He looked down at Alfie, feeling more confident that he had made his point clearly now. He pushed aside his curiosity, and decided he'd ask more questions later; Greg was a tad worried that he would seem far more interested than he should be. He rubbed his hands on his pants, and stepped back, and gathered up his bag. Reaching in, Greg pulled out the partially rolled up Potion's homework and threw it at Alfie.
"You can start with this," he said, readying himself to go, "I'll expect it ready by tomorrow, so we'll meet in the Library, say, after classes," and it wasn't a question so much as a direction to Alfie.