tastygarlicbread
Papy has a great life. Frisk has chosen the Pacifist route and saved them all. Frisk is loving their new life, Sans and Toriel are an item, and Asgore has even found a match in one of Alphys' new robots, inhabited by a very caring ghost that has a bad taste in music. Then, one day, everything changes. He finds himself back in the underground, with his brother nowhere to be seen. The strange thing is not that everyone but Frisk is gone, but the fact that Papy remembers everything. When Frisk goes genocide, Papyrus' life falls apart. With nobody to be with, and nowhere to be safe, he decides to put an end to it all, but not in the way you might think...
Please note, this is written for Papyrus' point of view.