Percy patted Charlie's hand, not sure what to do with it. - Love the slight awkwardness there.
"Does messiness cause you pain?" - LOL!
He ignored the small part of his brain that pointed out stranger things had happened. Like Fred and George routinely trading girlfriends. Or Bill liking to watch his girlfriends or boyfriends with Charlie. - LOVE that! Those kinky Weasleys!
"I may be Percy, but I am still a Weasley," - I think I actually said "Hells yeah!" out loud when I read that. :)
Percy's plan was simpler. He would tell Harry what he felt and that he knew what Harry felt. There would possibly be kissing after the telling. - And that's just plain funny. So Percy. X-)
In general, I loved how messed up the Weasleys were (well, I don't like that they were messed up, but I think it was realistic, you know?) and then how they began to heal. And their relationships with each other were great; you could feel how close they are. Excellent job!