Fred manned the counter until he saw people starting to arrive, and then he handed it over to Verity so that he could begin ushering them into the backroom, making it seem as if they were customers. The shop was crowded, so no one really noticed. He knew that Verity would figure something out, though, so he'd have to tell her about the DA - after the meeting, maybe, once they were all out and he could have some time.
He wondered if that bit with 'sneak' and the blotches was still in effect, or if he had to owl for Hermione's permission first.
After a few people had come in, he ventured back into the back himself to see if Neville needed any help, and came up behind the boy to clap him once on the shoulder. "All straightened out, Longbottom?"