Fics like Continuity

Time lines were always the same, predictable when Frisk falls to the Underground. It either ended with everyone living, about to pass through the barrier or with his own death in the Hall of Judgement. Upon visiting W.D. Gaster's old lab, Sans discovers a door that has never, ever been there before. He digs up some old research notes and finds the thing that he has never known he had been missing.

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