"Madam Granger is a muggleborn now," she said, still carrying on. "But, her grandchildren and so on—will they be muggleborn?"
Draco stared at her, frowning. Ron and Hermione—both with mixed expressions of shock and curiosity.
"No," Draco said slowly.
"So why are you discriminating against her now, and thus sabotaging the Malfoy family of an ally later on?" she asked.
Draco stared at her. "What?"
"By making an enemy of her now," she clarified. "You are rivaling two houses that would be pureblood and ruining the chances of a very promising alliance in the future."
"But the Malfoy family is superior—"
"—now," she interrupted. "Yes, yes. But can you guarantee that in the future, Monsieur Draco? Are you really so arrogant and ignorant you can safely say that you will never need the help of any other pureblood family for your grandchildren?"
Draco stared at Harry, mouth hanging open.
"I am merely saying," Harry said slowly. "That you should never turn down an alliance that might benefit you—especially when it would not hurt you to keep it."
Draco blinked, closing his mouth and eyeing Hermione carefully.
"If you are worth my time," Draco told her. "I will… accept your alliance."
"What?" Hermione blinked. "I never—"
"Madam Hermione, won't you please join us? I am sure you have never heard of Quidditch either and these two are most anxious to explain to all those who listen about it," Harry said, smiling again.
Hermione stared at her curiously, before eyeing the two other boys. "… I… suppose…"
Ron grinned at her and Draco remained indifferent.
But secretly, both were very happy to explain more about Quidditch.