Experience Tumblr Like Never Before
Kinda surprised I haven't found a horcrux hunting fic where Regulus "I will betray the Dark Lord for my house elf" Arcturus Black (canon), or maybe, Regulus "I love magical creatures, Care for Magical Creatures is my favourite class at school" Arcturus Black (fanon), frees the dragon from Gringotts while stealing Helga Hufflepuff's cup from Bellatrix's vault (just like the Golden Trio do). But instead of it just flying off, never to be seen again, they become friends and Regulus brings a whole ass dragon to help him kill Voldemort.
or something like that...