Begin Again (Sans X Older!Frisk)

COMPLETE *This story takes place after an ending in which everyone is alive but they cannot reach the surface*

Heart of Bones (Frisk X Sans)

Frisk, now 18 years old, has been living in the UNDERGROUND for 6 years now and her birthday has just passed. Ever since she fell into the UNDERGROUND, she has always had a thing for Sans, the pun-filled skeleton. Sans also has a thing for Frisk. There's just one little problem: Someone wants them to be separated for...