One Last Promise  | An Undertale Fanfiction

One Last Promise | An Undertale Fanfiction

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WpMetadataNoticeLast published Fri, Aug 28, 2026
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Fanfic
Undertale
Game
Fantasy
Dark Fantasy
It has been five years since monsterkind left Mount Ebott with the help of Frisk. Now a teenager, that's six months they had been living far from their people with Toriel, who got hired as the first teacher for humans and monsters. Frisk lives that forced exile badly, but summer vacations are close enough to go back to New New Home and see all those they left behind. Soon enough, Frisk realizes something is wrong with Sans. Despite the forced smiles, the skeleton is suffering in silence. Worried, Frisk decides to investigate. Is he still mad for all these timelines they did something irredeemable, or is it something deeper? One thing is for sure, those vacations won't be like the others.
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Emerson Wilmore was an exemplary Ravenclaw student, known for her unwavering dedication to academics and an unyielding moral compass. However, things took a twisted and deviated turn in her life after her boyfriend, Cedric Diggory, was murdered by Lord Voldemort during the Triwizard Tournament. Now, in her Fifth-Year at Hogwarts, she is trying to navigate through her overwhelming and mind-numbing grief. Unexpectedly for Emerson, she finds herself caught in an unwanted storm of chaos that is brought by Mattheo Riddle, the Slytherin son of the man who destroyed her entire world. With his rebellious yet enigmatic, bad-boy attitude, Mattheo is everything that Emerson despises. For Mattheo however, he cannot help but be drawn to the perfect and unblemished Ravenclaw. Despite her palpable disdain for Mattheo, an unusual interest flickers. As he tries to unravel the mystery of the girl in any shape or form he can attempt, their hostile exchanges finally burn into a magnetic connection. Amid their blinding animosity towards each other, the two slowly start to discover that the line between love and hate is precariously thin, a line that they both find terrifying to cross. #1 slowburn #2 enemies to lovers #4 Mattheoriddle #2 harrypotter

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