hoardoftrash: “I can prove it mathematically! Actually– let me grab my whiteboard!” idk if the Underfell bros would ever fight over their dad, but if they did… it’d probably go like this… bonus:
tags: Hehehe, Underfell, Gaster, Sans, Papyrus
original: https://eikuuhyo.tumblr.com/post/141908684443