No one imagined life at Hogwarts to be easy—a wizarding school was bound to be filled with vastly just as much drama as a muggle school, but no one could have known that on the fateful day of Ranrok's loyalists attacking Feldcroft, that Sebastian would end up cursed.
Sebastian was only wanting to help and in the process he was attacked—leaving him to develop a debilitating illness, that made it almost impossible for him to return for his final year at Hogwarts.
You could not help but feel responsible or to blame—despite having no true connection to the attack, apart from Ranrok's loyalists trying to beat you to discover your ancient secret and so it almost felt as if it was your responsibility to do whatever it took to save him.
Sebastian was too important—and so you knew deep down, you would do anything in your power to bring him back to the boy you once knew and if that meant walking down the path of the Dark Arts, then so be it.
First step—getting past his horrible uncle, Solomon, who despite caring little for Sebastian, is adamant in keeping you away, denying anything you could do would do anything but make things worse.