Inheritance - An Undertale Fanfic

Everyone knows about Sans and Papyrus, the two most memorable residents of Snowdin Town. But they have a long-kept family secret - over a hundred generations back, a vampiric gene was weaved into their family line, showing up in a few generations every once in a while. It hasn't shown up actively since Sans and Papyrus' great-great-great grandfather, but it just did. And it's stronger than it's ever been.

Just a story I wrote a long time ago and went back to while trying to overcome writer's block.
I'm also casually sliding a teeny bit of Papsriel into this (because stories need romance and also fUcking hell I love that ship), but it won't be the main focus in any sense.
WARNING: This story contains mentions of matter such as eating disorders. Please do not read this if you are sensitive to such matter.