While Potter stared at him, Greg stared back, eyes narrowed. What was Potter doing turning up at his flat? How did he even know where his flat was? As far as Greg knew, since he wasn't a convicted Death Eater and had already worked off his community service the Ministry had no right to keep track of where he lived like this. Greg briefly wondered whether he should ask Draco, but Potter was talking again before the thought really had a chance to catch hold.
"Suspicious activity?" His frown turned into a glare. He hadn't done anything wrong, he was sure of that, and the only people who'd been in his flat were people he or Pansy had invited. Pansy wouldn't invite anyone who'd be so careless as to perform Dark Magic and Greg had only invited his family, Pansy, Draco and Marcus. "You want to come in now?" Greg stood his ground in the doorway. He didn't even have his wand with him, but he wasn't going to let Potter in just because he said so. He'd almost rather go to the Ministry than have Potter in his flat. He shook his head, water dripping down the back of his neck from his hair. "No. We can go somewhere else."