Fics like Adopted Promise!

Sans thought he'd lost one of the people he cared about most when Frisk gave her own life to stop Chara. As he sat there, rocking the child's still form, he made a promise... one that he'd do anything to keep. Then, a tiny skeleton baby with wispy brown hair gives him the chance to make things right and Sans comes to learn the joys and pains of being a father to his little girl.

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