Uphill - Faithtale AU (Sans x Frisk)

When Sans gets the opportunity to pursue his dream job under a famous scientist, he takes it, like any sane person would. The first few weeks, everything is great, until he catches on that something isn't right.
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Credits:
FaithTale AU belongs to @momoishy​ and @smollvivi​ on tumblr.

Undertale belongs to TobyFox.
Art is by @kaitogirl on deviantart.
Stunning cover is by @rileh_ on wattpad.