So Rot Vie Blut is a 3-chapter Snow White and the Seven Dwarfs fanfic by afterandalsia that goes for a Grimmification of the film's story where Snow White is the antagonist. It can be read on this Kink Meme.
Snow White has never liked her step-mother Grimhilde, despite Grimhilde's attempts at befriending her. When Snow White's father is murdered, things take a turn for the worst. There are several assassination attempts at Grimhilde's life which make her paranoid. Snow White isn't much help. She speaks to her step-mother with fake kindness. As time goes on, it becomes clear to Grimhilde that her step-daughter is a danger to both her and the kingdom.
The story is NSFW, but it's done for creepiness rather than appeal.
This fanfic provides examples of:
- Adaptational Nice Guy: Grimhilde isn't really cruel to Snow White. The only time she does is when she forces Snow into becoming a chambermaid, to dissuade Snow's promiscuousness.
- Adaptational Villainy: Snow White is hungry for the throne and will do anything for it.
- Adaptation Personality Change: Grimhilde isn't a Wicked Stepmother and isn't narcissistic about her looks.
- Alternate Universe Fic: Grimhilde isn't an evil narcissist who abuses her step-child. She's a benevolent ruler, while Snow White is the dangerous one.
- Cassandra Truth: The man who poisoned the king tries to tell Grimhilde that Snow White was behind it, but Grimhilde doesn't believe him.
- Enfant Terrible: The first thing that Snow White tells Grimhilde is "You might be Queen, you know, but you will never rule this land". Even at nine, Snow White has her eyes on the throne and is unusually cold.
- Fan Disservice: Snow White is very sexual and the fic goes into detail on it, but it's meant to be creepy because she's a teenager. The creepiness is added onto by how she either seems uninterested during sex or she does dangerous things with her knife during sex, like holding it up to her lover's neck.
- Fille Fatale: In her teens or possibly even her tweens, Snow White seduced a man into murdering her father. She sleeps around with numerous men over the course of the story.
- Patricide: Snow White got a man to murder her father.
- Really Gets Around: Snow White has sex with several guards, a knight, a squire, the chamberlain, the chaplain, her own tutor, and the man who Grimhilde hired to kill her. Grimhilde makes Snow White into a servant to try and stop her from sleeping around but it doesn't work. Despite all this, it's implied Snow White likes seduction rather than the sex itself.
- Spared by the Adaptation: Grimhilde doesn't personally make an attempt at Snow White's life and never has her Disney Villain Death.
- Vague Age: Snow White is canonically fourteen at the time of the film. The fanfic never concretely ages her, but it's implied she's a few years older than in canon.