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Sebastian Cygnus Black the son of regulus black and Merope Gaunt half brother to tom riddle favorite nephew to Bellatrix Lestrange nee black and Sirius Black heir to both the black and gaunt house and is a 6th year student at Hogwarts who is dating Celeste Zabini a pure blood 6th year prefect who knows his secret of him being a unregistered Animagi form of a grim he is best friends with Theodor Nott and Blaise Zabini