After True Pacifist of Underfell, and after barrier broke. Monster-kind and Human-kind was somehow got along very well... You were now living with Papyrus a.k.a Sans and Papyrus's house... You always slept in Papyrus's bedroom due to... Sans's still Anger issues... After 7 days... You were in Papyrus's sleeping on his bed as you hear a door opening... Then... you thought it was Papyrus... However when you got up from the bed to look at the opened door... it was Sans and his expression was one of... Anger and Caring?

Fell Sans: Welp, it seems I have caught you, Human.

He then walks to you, he is quite big for you. As he suddenly picks you up and drags you from Papyrus's Room to his.