Disclaimer: Giving due credit to Jk Rowling and her wonderful world of wizardry and magic. I do not own any charcters mentioned here , just my imagination.
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After Voldemort's downfall, and Kingsley newly elected as the Minister Of Magic, The Malfoys switched allegiance, denying further commitments to the Dark Arts. There was no Bellatrix to observe this change of heart, and Draco was pleased to see the coloring returning to mother's cheeks now that the taint of evil was once again banished from their home.
Thanks to Hermione Granger, pureblood supremacy laws were no longer in effect.
Potter and company went on to become Aurors.
Draco Malfoy, the prodigal son, discovered the laws of attraction.
To no one's surprise, it was little miss mudblood.