"Do you still play Quidditch?"
"What do you think, Potter?"
"I think… that you do."
"And why would you think that?"
"Well… because you're not, um, overweight… and you, er, have pretty defined… muscles?"
"...Is this your way of telling me that you think I'm fit?"
"...Shut up."
"Oh, don't worry, Harry, I think you're fit, too."
Draco winks at Harry, who blushes scarlet. He only realizes later that Draco called him Harry, not Potter.