From Pureblood to Halfblood

Scorpius Hyperion Malfoy became best friends with James Sirius and Albus Severus Potter and Rose Weasley. Nearing the end of the school semester, Scorpius was invited to go along with his new friends to the Potter household. Here is what happened.
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P.S I added a song inspired one-shot. IT IS NOT RELATED TO THE STORY LINE! You have been warned.