As questionable as the adoption potion and ritual was both were rather easy to procure. Sirius bought the potion from an apothecary in Knockturn Alley; it was a dingy little store but he knew from his time as an Auror that the old man running it was in fact a potions master that had been stripped of his title for making potions that the ministry had dubbed illegal. Finding someone who knew the adoption ritual was slightly more difficult. One could find anything in Knockturn Alley if you knew here to look. His Auror knowledge was proving invaluable but he had to move quickly; it would only be a matter of time before the ministry was alerted to his activities and his soon to be ex-fellow Aurors dispatched to investigate; he was wanted for questioning in the death of the Potters and the subsequent disappearance of their son, after all. His time within the junk shop was shorter than his time had been in the apothecary brought about by the fact that he had enough money to buy the item, an old tome, that he needed. The thought of Aurors arriving was only part of the reason he was in a hurry. The other part being Harry was being looked after by Kreature and he trusted the creepy little rodent about as far as he could curse him. When he arrived back home, he'd have to get used to calling it once again, he was greeted by silence; it wasn't surprising since the sun had yet to come up. Stepping into the parlor he stopped and blinked. Apparently his mother was up seeing as she was seated in one of the rooms chairs, reading todays issue of the Daily Prophet, and munching on what looked to be a light breakfast. That didn't surprise him, what surprised him was the fact that Harry was sitting on the floor within reach of the wretched old woman. Clearing his throat he continued into the room as if nothing was amiss. "I'm sorry if Harry woke you." He apologized as he reached down and plucked his godson away from what he perceived as danger.
"He did not." Walburga commented idly not the least bit interested in holding a conversation with her first born. "You were out early."
Sirius swallowed and sat down in another of the chairs and placed Harry on his lap. "I was gathering the supplies I need for the adoption ritual." Using one had to keep the boy from tumbling to the floor he used his other to retrieve the shrunken items from his robe pocket and deposit them onto the center table in which they enlarged to their proper size.
Walburga would have been impressed with her sons dedication to the small boy if she truly cared. Lazy eyes skimmed over the items and she was deeply pleased that both items had a distinct dark feel to them; maybe there was hope for her remaining offspring after all. "Have you decided on a name?"
"A name?" Sirius asked stupidly having no idea what she was talking about. "For what?"
"The boy." Walburga sighed. Then again maybe Sirius was beyond saving. "Once the ritual is complete you'll have to register him at the Ministry as if he were a newborn. And seeing how you are wanted in connection to his parents murder using his current name would be utter foolishness. Besides he'll be a Black and a child of the Black family needs a proper name."
Sirius hadn't thought about renaming Harry. And for one bleak second he questioned what he was doing. He felt like he was stealing Harry from James and Lily. He swallowed hard. "I….who am I to take his name? He's named for his father and his grandfather. I can't just take away his heritage!" He was becoming distressed which was causing Harry to fuss.
Walburga sneered. "You pathetic whelp! You aren't taking away his heritage you're just replacing it was a different one. A better one! If you want my help, my money, then you'll do it and stop whining about it! His parents are dead! Gone, they aren't coming back! No more running to the Potters to escape your horrid family!" She cackled madly. "How the mighty have fallen." Standing she towered over her still seated son and soon to be grandson. "I expect everything to be in place for the ritual by the time I return or I'll turn you into the Aurors myself!" With that said she left the room and a crack from the hallway signaled that she left the house altogether.
"Crazy old hag." Sirius mumbled and sighed. He didn't have a choice in the matter no matter the guilt. If he didn't do this then there would always be a chance that Harry would be taken from him. Tightening his arms around the still fussing boy he rocked him as he saw James do a thousand times. "You're mum and dad were wonderful people pup. And I'm sorry you won't get to know them but I'll try my best to give you everything you could ever want." He placed a kiss on top of messy black hair and sat him back on the floor. "I just hope wherever you are Prongs that you'll forgive me for what I'm about to do." Looking away from the ceiling he opened the old tome and began to read.