Goosebumps fanfiction
It is known that at one point in his childhood, Draco authored Goosebumps fanfiction. This was revealed during a stream of the game Goosebumps: Horrorland wherein Draco opened up about his childhood and early writing exploits. Though the fanfiction itself has been lost to time Draco says it was titled "Monster Blood IV", written before R. L. Stine wrote that as an official (and final) installment in the Goosebumps series of books. According to Wikipedia, Monster Blood III was published in March 1995 and the real Monster Blood IV was published in December 1997. This provides a window of about two and a half years where Draco could've written the story. He says he penned other stories during that time but could not remember their titles or what they were about. Even when asked what his "Monster Blood IV" was about Draco drew a blank.
Since that Horrorland stream it has become a common joke that Draco is hoarding the Goosebumps fanfiction somewhere and is too embarrassed to share it. Draco has played into this joke on numerous occasions either agreeing with hecklers or claiming he'll release the fanfiction for reaching absurd community requirements on Twitch.
During the 2018 reboot of Fanfiction Factory when it was revealed the first month's theme would be "Goosebumps" many people in the Gatorbox community assumed Draco would read his fanfic considering one of his personal rules for the show was that he was going to read something he wrote and keep the authorship anonymous. As it turns out he did not have "Monster Blood IV" or any of his Goosebumps fanfiction to read for the show. It was later revealed in the 2022 revival series Fanfiction Factory: The Podcast that Draco was planning on reading some of his old Sonic the Hedgehog fanfiction from 2002. The fanfiction in question, "Resident: Knothole", was the sole feature of the series' premiere episode.