Sans still had PTSD from the Genocide routes. He’d never forget them, and just how could he? He thought that after Frisk saved everyone and promised to NEVER reset again, everything would be okay… He was now the adoptive dad of you and your younger sibling Frisk, and loved you two even though you and Frisk were both human. He could finally be on the surface world, just like he dreamed. Everything is fine now, right?…

But it wasn’t…Not for him.

You were asleep next to him in the couch, tired from whatever extracurricular activity you had after school when Sans started dreaming about the Genocide routes.

His bones rattled under stress, his left eye glowing blue and yellow as if would be if he were in battle, sweat rolling down his skull… It got so intense that he did something he would NEVER do, never to you, never to anyone he loved.

A bone attack was summoned, and it stabbed you in the chest, cracking your soul. The horrible sight immediately made him panic, and he snapped out of his sleepwalk-like trance he had due to his dream. “Kid?” He called out to you, standing there in shock.