The Butterfly Effect 💚💛🧡💜💙🩵❤️
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After running away from home and falling into the Underground, Reader finds herself the prisoner of two skeleton brothers, who intend to sell her soul to Asgore for a good cut. There has to be something that she can offer that could set her free. As usual for her - things can never seem to go as planned.
Series
- Part 1 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
- Part 1 of A Done Deal + Extras
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Using Frisks Soul, Asgore manages to bring down the Barrier, in the process absorbing the souls and becoming a being of unfathomable power. Using a monster army and his newfound strength, he takes over a town at the base of the mountain.
Monsters become the reigning power, and a human slave trade blossoms in "Overground" (so named by Asgore). Monsters own humans as butlers, pets, and entertainment.
Sans never thought he would personally own a human servant, but after a chance encounter, he has to face his worst fear - living with the same creature as the one that haunts his worst nightmares.
Series
- Part 2 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
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Their King is dead. The six Souls are Gone. Their future lays in ruin.
Frisk has slipped through the barrier and left the monsters with shattered hopes and a toppled monarchy. With no witnesses, it was pure, selfish regicide. They were loved by all, and thus, their betrayal cut all the deeper. For the third and final time, humans had stolen everything from them.
Anger has a way of changing people. It remains in the Soul even as memories fade.
Frisk may be gone, but the RESETS continue, multiplying the resentment within them and morphing the residents of the Underground into tightly wound reflections of their former selves. No longer in a position to do nothing, Sans is Determined to find a way past the barrier for the sake of his brother, and for the sake of justice.
He’ll give anything to achieve that goal. His Soul included.
He’d found an alternate method that should work, buried deep inside a gilded dusty tome in the royal library. Instead of using LoVe to pass through the barrier, Sans was going to use love. He was going to have to gain a consenting human, and convince her to bind her Soul to his. Permanently.
Series
- Part 3 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
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It's six years after the Emergence, and while most of the monsters decided to stay close to the mountain on the west coast, slowly but surely a good few made it over to the opposite coast and settled down in Washington DC. Besides the King and Queen and their human child - relocated to the political center of the US for obvious reasons, you mostly see dogs, bunnies, and cat monsters integrating themselves among your coworkers and neighbors. Things aren't perfect, but they're improving day by day.
You have a fulfilling job as a PR and Marketing Expert, a handful of close friends, and a stable and predictable routine.
When you randomly meet a brand new type of monster in town while late night shopping, you can't help but be frightened of him. After all- he's literally a living skeleton! Embarrassing, but at least you'll never have to see him again... right?
What happens when fate has other plans, and you just. keep. running into each other?
Let's find out.
Series
- Part 4 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
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The Purest Soul 💙 by Sinsational_Sinnabon for merrinbrite
Fandoms: Undertale (Video Game)
09 Mar 2026
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The leader of the human province and head mage, Cadoc, has no qualms in letting anyone willing to listen know that his third daughter—an unassuming girl with a deep blue Soul—has the most powerful magic known to mankind. She's able to perform feats that would make the entire monster kingdom tremble in fear. She may even have enough magical prowess to tip the scales of power between the already tentatively peaceful neighbors.
Reluctant to violence, but hand forced with the protection of his recently unearthed populous, King Asgore levels the humans with an offer. Hand over this Blue mage to be paired with his Son, in a show of unity between their nations. Eager to breach the tall walls of their secret kingdom for information, Cadoc agrees.
Unbeknownst to all, there's a third party at play, who's been intently watching the Head Mage's daughter as she spends her time in the meadow between their lands. She's nothing like everyone says she is... and soon he finds he's fallen for her—hard.
When the Prince agrees to switch places with him for the courtship ritual, her secret admirer will have to win her heart, and Soul, sight unseen. But can they both keep pretending to be someone they're not?
Series
- Part 5 of The Butterfly Effect 💚💛🧡💜💙🩵❤️