One day sans went to go to get papyrus at Muffets. Then when sans was walking through snowdin he found a picture.
sans: what's this?.
sans:maybe papyrus knows what this is.Then sans returned home and said "brother do you know what and who this is?" Papyrus says"no but think I know how to get to him"To Be Continued...
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Underswap:The great gaster?
ActionIn this story underswap sans and papyrus go to find gaster because they think that he is there lost brother and papyrus comes because he just wants sans too be safe.