It might surprise Draco to learn it, but Narcissa's smile revealed that she was proud of him. Lucius had always been careful to hide just how much insincere pandering was necessary to gain his influence at the Ministry, but now Draco was discovering for himself that lying for personal gain wasn't really as humiliating as it seemed at first.
"Well done," she told him. "They're still the same fools they ever were, they like to believe in redeemed sinners." They would be quite easy to convince that Draco had seen the error of his ways, that he wanted to embrace the winning side. It would only give his arguments more credibility, more weight with the people who mattered. Lucius had always played to the Minister's ideals before bending the man to his own.
"Listen to me, Draco," she said, meeting his eyes. "You're in a good position. Even your curse-breaking is ... well, perfect for this. You carry the wand that defeated the Dark Lord. Use it to your advantage. They want to trust you. They want to unite us." She smiled, not needing to finish the rest of that thought. Draco could do a lot if he made the right connections now. The goalposts might have moved, but so many games were won by the one who caught the Snitch while others were chasing Quaffles.