Nuclear Love (A G!Sans x reader)

It is the fallout. It's been five years since the monsters came to the surface and the humans dropped a nuclear bomb that destroyed a majority of the world. The radiation from the bomb mutating the humans and monsters beyond all rational thought. You have been alone since then. Traveling the country and trying to survive. What happens when you meet a dark and broody skeleton monster who doesn't give two shits whether you live or die?
Disclaimer: I don't own Undertale or the Fallout series. All credit for Undertale goes to Toby Fox and all credit for the Fallout series goes to Bethesda and their designers. Credit for the cover art goes to CommanderPie on 8tracksaudio. I only take credit for the plot and story line. Also this is a slow burn. I just wished to let you know.