This is a AU of Horrortale where Frisk ran a neutral timeline where Frisk escaped the Underground but was put in a insane asylum until she escaped and personally fell into the underground and explained to Sans what happened although she was too late due to Undyne taking Sans left eye leaving his eye red. Frisk and Sans would later get married and have a daughter named Sira... after quiet some time some unlucky humans were used to brake the barrier and monsters left but were in shambles of what happened example sans is now extremely paranoid and a bit edgy around crowds. Papyrus didn’t get far with making his food with the flesh of humans but he still makes Spaghetti with his niece, who sometimes eats the spaghetti with human organs. Sans is also very cold against Undyne after all she did unfortunately the humans really hate the monsters for what they did and do not trust them. Sira’s left eye is red but when is threatened or angered it will flare a deep red glow… she wears a blue jacket like sans but has blood stains on her jackets wrist and the bottom of the jacket, she has a red sweater under it and a pink skirt… Frisk and Sans were sitting down talking as Sans sharpens his axe Sans: Unfortunately for that human… it was a true “Axeident” he chuckles and Frisk rolls her eyes Frisk: you have a terrible “Axe-ent” Sans stops sharpening and thinks for a moment before continuing until their Daughter teleports in Sira: hey mom, dad she has a bright smile on her face