Prompt:

"Okay Pettigrew", Harry said slowly, taking in the information of the last few minutes "if you weren't the Secret Keeper and Sirius wasn't, then who was and who betrayed my parents?"

Peter gave a sad smile, "Think who had the most to gain from their deaths Harry"

One-Shot:

Harry's mind whirred with possibilities. Who would gain from his parent's death, really? Anyone?

Definitely not Aunt Petunia and Uncle Vernon, they'd made it fully clear over the years how much bringing him up cost them. Remus and Sirius were definite no's given what had happened in their lives since... Dumbledore didn't need any additional fame, Hagrid had gained nothing from the experience...

He could definitely rule Hermione's family out - being muggles they wouldn't have even known of the war let alone his family... The Weasleys?

In a horrifying way the pieces almost seemed to fit...a poor family, helping to create the boy saviour they could then latch onto to bask in his fame whilst making financial deals off the back of that! That trip to Egypt they went on! What if it wasn't a lottery win at all, what if it was some sort of Harry Potter's friend sponsorship!

His head whipped round towards Ron in horror, a look of deepest betrayal etched on his face.

"You scheming little...how could you Ron?!" he yelled.

A look of confusion and hurt flashed across Ron's face, but before he could reply Peter's voice once again broke in.

"No Harry, no. Not the Weasleys. Think. It was..."

"Me." came a sickly sweet all too familiar voice, followed by a barked out "Reducto!"

The door to the room, already in a state of disrepair like the rest of the ruined shack, exploded into splinters and scraps. Harry raised his arm to protect his face, but one of the scraps slammed into it and his wand, the last wand any of them held, went flying towards the empty corner of the room.

Before anyone could react further, a huge bulldog burst through the now empty doorway and slammed into Pettigrew, mauling him, and his screams echoed out as his flesh was shredded by the vicious animal. As it raised its head momentarily, blood dripping from its mouth, before launching back for another bite of the rat-like man's flesh, Harry recognised it...and his blood ran cold.

"That's right boy." came the voice again, and following in the dog's trail, Aunt Marge stepped carefully into the room. A wand in hand, leveled carefully at the remaining unarmed group.

"Aunt Marge?!" Harry cried out in disbelief, his eyes having been torn from the dog that had revealed itself to be Ripper. "This isn't possible!"

"Oh but it is you little wretch!" she spat, "And I'd do it again if I had the chance! Wizarding filth! You see, I was like you once. I received a letter to that accursed school of yours, long ago. But I saw through the degeneracy of this society - the unnaturalness, the freakish nature of these...abilities... I left it all behind after I saw your world for what it was, and I vowed to live a normal life. Put the shame of this curse behind me, and I vowed to never let the stain of it sully my family again!"

"But then Vernon married Petunia, and when I met her freakish sister and your disgusting father at family gatherings I knew. They tried to hide it, but the same curse, the same freakishness ran through their veins! I would not have it! I wouldn't have Vernon and our family cursed by this again! So I did what I had to do...for the sake of the family..."

"But you..." she sneered. "You had to survive didn't you? And from the moment Vernon told me you'd been left on their doorstep I cursed you. I could do nothing whilst you were under their roof, lest the blame fall onto Vernon and Petunia. I watched as you grew up, disgusting, worthless as you are. I kept Ripper in line. Oh he had his fun, but you were never truly hurt. But finally, finally, my time has come. Ripper, heel!"

Ripper detached himself from Pettigrew's now-corpse, and obediently padded over to Aunt Marge, growling at Harry as he went.

"Now you're away from the family. Now you're at school. Two muggles could never be to blame for what happens to you here..." she continued, a vicious smirk spreading across her face as she spoke.

"Aunt Marge, please!" Harry begged, as the true danger of his situation finally became apparent. But she continued over his voice, as if he weren't even speaking.

"Today I finish what I started all those years ago. Today the Potter line dies. Today, our family will be normal again. Today your stain on the family will be gone. Ripper? Go get him!"

Ripper charged. Pettigrew's blood covering half it's body, jaws open wide to expose razor like teeth. This was the last Harry saw. Everything went black, his screams echoed those of Pettigrew, and the work of Marge Dursley was finally complete.