"Aye, I might have made assumptions about you," Seamus grit out, blocking Percy's way with s sidestep. "But I'm not the one who sounded so disgusted by the idea. And you have no idea what I was basing my assumption off of. Unless you're somehow a mind-reader now."
The look Seamus leveled Percy was rife with disgust and barely contained anger. And maybe just a touch of disappointment. "Y'know, I used to feel sorry for you, but now I get it. Nobody likes a sanctimonious wanker, not even family. I hope George really is taking the piss at your expense. Can't think of anyone who deserves it more."
He'd have laced into Percy properly, but he wasn't going to do that in the middle of George's shop, and certainly not with so many brats around.