Draco gets a sinking feeling, watching Harry in the air. He asked Harry to come, because he wanted Harry to see him win the slot on the Slytherin Quidditch team. He's always planned to be Seeker; it's expected at home, and there's no good reason why he shouldn't be.
His try-out was a mere formality, because Flint wanted the Firebolts Lucius had agreed to provide for his son's team. But he wasn't noticeably worse than anyone else, so it went well.
Until Harry. Harry's always been wild on a broom - no-one ever taught him which maneuvers are likely to break his neck, so he just does them. Draco spent more time dodging Harry and telling him off for it than really flying, last year. He didn't realize what it might mean for Quidditch - for Seeker. But looking at Flint's face now, he understands.
Flint is thinking that Draco Malfoy has an important father, and Firebolts are useful, and would not be an embarrassment to the team. But Harry Potter is a brilliant flier, a natural, and with a little training he might be the best player to come out of Hogwarts in generations. Draco won't concede that Harry is that good, but Flint will.
Harry catches the Snitch, swoops down like he was born to it.
Look, Draco wants to say. Let me go up again. I can do that just as well as Harry, who's after all hardly more than a Muggle and never saw a broomstick before last year. But he doesn't have the nerve to fly like Harry does, and it makes him sick. Harry tries to catch his eye, but he won't look. He watches Flint watch the subsequent mediocre fliers.
Harry hovers nervously over Draco's shoulder. Draco wants to yell at him to go away - to kill him for ruining this. He still might, later. For the next five years he's going to have to live, knowing that someone else is Seeker and he isn't. It's worse because he doesn't think Harry meant it. Harry Potter could be a crack Seeker and not know it, because that's just how he is. Anyone else would fear Draco's plans for revenge, or what favors the Malfoys will withdraw. Since it's Harry, he's more likely worried that he's hurt Draco's feelings, and he'd be hovering even if Draco had no father and didn't know where he slept.
He ignores Harry until the team's getting up to leave, to debate their choice, which really isn't a choice at all. Draco stands up too, calls out for Flint. "There's something else to think about," he says, and his voice sounds so very calm and assured. He takes Harry's glasses; drops them; steps on them. It's the worst thing he's ever done to anyone who matters. Everyone looks at him. He bends and picks up the frames, puts them in Harry's hand. Harry hasn't made a sound, but looks awfully shocked. Draco smiles at him, but Harry probably can't see it.
"I'll take them to Snape for you, Harry," he offers later. Because of course he's going to be Slytherin's new Seeker now, and he can afford to be kind.