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The Union Of The Snake

Summary:

When an old parchment gets soaked during a Potions mishap, an unwelcome visitor from the past appears and turns Harry's seventh year into something entirely unexpected.

Notes:

Disclaimer: The Potterverse is JKR's, not mine. Written for fun, not profit.
Warnings (please read these before yelling at me): Violence, adult language, sexual situations, threesome, OOC-ness, voyeurism, under 18, mention of past sexual abuse. Also, Harry is extremely unpleasant (as in: a complete bastard and an unhinged one at that) in the first few chapters. There are reasons for this, of course, but if you want a heroic Harry who always does the right and fair thing, this probably isn't the story for you.
Regarding ships (skip if you don't want to know yet): Tom Riddle/Draco, Tom/Harry, Draco/Harry, Tom/Draco/Harry, Ron/Hermione (established), Blaise/Ginny (established), Pansy/Neville (established) and Greg/Luna (established).
A/N: This story takes some of the events of the first six books into account, but it doesn't pretend to bear more than a passing resemblance to canon. The timeline regarding Tom Riddle's past actions, for one, has been changed around.

ETA June 2019: I’ve had this story taken down from Goodreads because it made me very anxious and uncomfortable to discover it on there, pitched against polished, professionally published original works. This fanfic was written for fun and fandom enjoyment only. Please DO NOT re-add it to that site or post it to similar ones. Thanks.
 

(See the end of the work for other works inspired by this one.)

Chapter 1: Prologue

Chapter Text

Everything started with an impressive bang.

It wasn't the first Potions mishap that week, but this time around, the consequences were rather more serious than usual.

The loud explosion sent the cauldron's contents flying in all directions and somehow, the pungent concoction also found its way into Harry's satchel, where it soaked through an old parchment that probably shouldn't have been there in the first place. On the night of his arrival, Harry had found it hidden under his pillow. He'd been meaning to show it to Hermione, ask for her advice, but somehow, in the middle of the hustle and bustle of the first week back at school, the whole thing had completely slipped his mind.


At the bottom of Harry's bag, a drawing of a snake came to life. It slowly slithered off the parchment, out of the bag and onto the floor.


None of the students noticed. They were too busy laughing at the person responsible for the ugly mess. Neville Longbottom no longer received detention for his repeated 'accidents', but his clumsiness remained as entertaining as ever


"Come on," Professor Slughorn said. "Settle down, please, ladies and gentlemen."

His words were spoken in vain, however, for he lacked not only Professor Snape's skills but also the man's unwavering authority. Students continued to laugh, and point in an all too childish manner, until Hannah Abbott's piercing scream suddenly cut through the room.


An ominous silence fell. All eyes turned to the back of the class and the spot she appeared to be staring at.


There stood Tom Riddle. He looked about sixteen and was wearing a Slytherin uniform from many decades ago.