DISCLAIMER

This is a Fanfiction Crossover between the Supernatural and Shadowhunters TV shows. The characters of Cassidy Blossom, Nick, Beatrice and Chamsael were created by the author. The rest of the main characters in this story belong to the creators of the aforementioned series. The depicted events do not affect past, present or future events in storylines.

AUTHOR'S NOTE

This crossover is set in both universes of the Supernatural and Shadowhunters TV shows, setting the disposed episodes as starting points (see below), with the story ending before the next episode in line. It will consist of a prologue, five chapters and an epilogue. The plot is set in a way that it would not bring conflicts to past or upcoming events in both series´ canons.

Chapters will be gradually published. I hope fans of both series like the plot and my writing style. Reviews and harsh criticism are welcome. Profanity filter is turned off. Enjoy...

THE ROAD SO FAR…

Supernatural (Season 12, Episode 15): After multiple lies, secrets and setbacks, Sam confesses to his brother that he is working with the English Men of Letters and that he's getting leads on cases from their superior intelligence network. Dean agrees to start working with them as well, pointing out his mistrust, and stating as a condition that as soon as something feels off, they leave the group.

Shadowhunters - The Mortal Instruments (Season 2, Episode 10): The battle at the New York Shadowhunter Institute results in the activation of the Soul Sword by Jace Weyland after being tricked by Valentine Morgenstern. The sword´s energy blast causes the deaths of dozens of Downworlders at the scene. Jace chases Valentine and beats him in a ferocious battle while Clary Fairchild tries to destroy the sword, failing and losing it in the process. Valentine ends up incarcerated by the Clave in hopes of getting the whereabouts of the Mortal Cup. With numerous casualties and the Soul Sword still in unknown whereabouts, the Shadowhunters must carry on and do their best to revert the situation.

PROLOGUE

It's a cold and extremely dark night. A freezing breeze enters through Cassidy's exposed neck, reaching every pore of her skin covered in satin clothes. Chills run down her spine. How did I end up in this park at this hour? She whines.

The answer lies deeply within her troubled spirit, tormenting her with every step she takes. She was raised under the care of one of the most devoted catholic families in New York. Her entire childhood, adolescence, and part of her young adulthood, were conditioned according to her parents' interpretations of the Bible, and she had always accepted that. She had never flinched, complained, or even questioned the strict regime she was always subjected to. Her faith had always been stronger than her needs. However, she had just given in to temptation.

What happened to me? She asks herself repeatedly. I almost broke my vows back there, giving in to the temptations of the flesh like that. She starts muttering her well-known prayers, hoping to magically forget how she almost had sex, with a guy she had just met, at her best friend's birthday party. I almost lost everything back there, she sighs while looking at her small gold watch. 2:15. I should have taken a cab. Her thoughts about the current situation are soon wiped by the image of the man who had broken her iron devoted will. She remembers his pale face, his pronounced cheeks and his grey soothing eyes. Oh, my god, those eyes, those big, round, hypnotizing eyes. She mutters and sighs his well-remembered name. Nick…

The sound of a moving bush startles her. She turns around, checking the emptiness of the place. The blackness of the starless sky, the freezing wind, the darkened trees and the flashing park lamp are more than enough to make Cassidy Blossom walk faster. Got to reach the street, she whispers to herself. The sound of smashed leaves makes her heart go haywire. She lacks the courage to look.

Someone grabs her wrists when being steps away from the street. Fear shuts her eyes. She screams, kicks and struggles, trying to get away from her assailant's strong grip. Her fight ends when she hears his voice.

"Girl, it's just me. Calm down…"

Cassidy opens her small blue eyes. The person still holds her wrists tightly, yet she feels safe. Seeing his gray eyes staring at her with such peace soothes her. The sight of his black hair under the dim light of the park lamp makes her body shiver with pleasure. Nick...

"Take it easy," he stops her.

He gently lets her wrists go, stands in front of her and fixes all the loose locks of her blonde hair. He glares at her. She stares back at him. My god, what am I doing? Why can't I stop him? Her hands are paralyzed. Her body shivers with excitement.

"Now, are you ready?" He asks seductively.

"Yes…"

Nick abruptly changes his facial expression. His smile turns grim. His whole silhouette becomes shadowy. His voice adopts a more sinister tone.

"I wasn't talking to you, blondie."

"What are you…?"

She doesn't manage to finish her question. A huge pain invades her back, lasting a few seconds before she stops feeling anything at all. Her life fades away as she sees her own bloody heart, out of her chest, held in the air by a hand full of claws. Cassidy Blossom is now a corpse lying on the park sidewalk, surrounded by a pool of her own blood.

Nick doesn't show fear or surprise. Instead, he walks away, followed by the person who performed the kill. All lamps in the park stop emitting light all of a sudden. The place goes pitch black. The breeze turns even colder.

"Is this the last one?" He asks.

"There's still one left," the killer puts Cassidy's bloody heart inside a small wooden box. "I already have her name. It's just a matter of time now…"

The shady character hands Nick a small rolled piece of parchment. He opens it, smiles upon reading the name written on it, then rolls it back, putting it inside one of the numerous pockets sewed on his black trench coat. He mumbles the same words over and over as he walks away.

"See you soon, Clarissa Fairchild…"