Gellert and Percival Graves are identical twins, so identical even their family can't tell them apart, until you get to know them. Despite being twins, they are not close and with age fall into completely different paths, Pervical upholding ministry law, while Gellert immerses himself in dark magic, which drastically changes his appearance and alienates him from his family. It seems the Graves twins are destined barely feature in each other's lives, until Gellert is obligated to attend a family function, where noble, stiff Percy officially introduces his fiance, Newt to their family and for the first time, Gellert envies Percy, and *wants* something more than power and dark magic and has no qualms with trying to win Newt into his bed. Unfortunately Newt is disgustingly devoted to Percy, so Gellert decides if he can't win Newt by his current apperance, maybe he just needs to 'borrow' dear Percy's with a little help from his old friend Polyjuice