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Sirius had just deposited Voldemort’s lifeless body in the core of house only accessible to the Head, and Walburga had Stunned him when he tried to go in search of Peter to kill him for his betrayal of James.
Continuation from Sirius waking up due to noise created by Aurors ambushing Grimauld to arrest him, and his mother holding them off.
***
Sirius walks down the stairs, and calls out with all the strength he can muster in his current emotional stage, “There is no need for that. I am right here.”
At his voice, all wands turn to him. 15, he counts. That sends a thrill of satisfaction up his spine, despite the overwhelming pain that has suffused his being since he found James’ body on the stairs. He had thought he cannot hurt worse than he already does as he went up those stairs. What a fool he was. He thinks he left behind the last of his sanity with Voldemort at the core of Grimauld as he looks at Aurors closing rank and watching him closely. More accurately, watches him twirling his wand in his hand.
Sirius looks at his mother standing on the stairs blocking the path, and he thinks there is more he can lose. He remembers when his mother whispered in his ear that it was always him. He can’t cause her more pain, and he can’t share the pain he feels in his heart with her either. He looks back at the Aurors and knows he doesn’t have long until they act regardless of who is the room or how likely is he to curse them.
“Kreacher.” He says, and the elf appears beside him. He ignores the gasp let out by his mother and orders Kreacher to take her to his grandfather Arcturus and keep her there safe until the Aurors have left their home.
Sirius is consumed by pain, and the only he knows to deal with it is by causing others pain. He thinks of James, of Voldemort, of everything he has lost.
He quickly raises his wand, aims at the first person standing in front of him, even as 15 curses fly his way, and casts,
“Avada Kedavra.”