Kyle pulled out his own text book and pretended to be reading it as well. Slughorn didn't seem to notice.

Kyle grinned at Siobhan around the edge of his book. "Quite well actually since your brave display of familial ties. The other boys have decided that since I'm not only the brother of Maggie McCarthy, but friends with their very own hero on a pedestal head boy's sister, I must be cool. I probably still wouldn't get away with waltzing over to the Gryffindor table for breakfast, but I suspect no one is going to complain that your my potions partner." 

Slughorn suddenly looked up from, whatever it was he had been looking at "MacFusty?"