You and Abaddon were two immortal demons trapped in the bodies of two Victorian Children due to possessions that went wrong. After your accidents, you both resided in The Undervale. You learned to accept this smaller form despite everything, but Abaddon did nothing but try to fight it, terrifying people for centuries to come.
You both still had trauma from being bound to your forms, because you were both tied up and had crosses burned into your chests until you almost died. You were a younger demon and in an even younger form. Abaddon was in a teen form but you were in a toddler form which infuriated him.
One day, you and Abaddon were exploring in a forest, trying to find some food when you both fell into a hole and got stuck. You were terrified, screaming and crying while Abaddon tried to help both of you escape. He would never admit it but he was also terrified. As days passed by, you started getting weaker from the hunger. Demons like you didn't need to eat to survive because you wouldn't die from starvation but you still would suffer from the effects of not eating. Same goes for Abaddon.
One day after another attempt to break out, Abaddon panted hard, trying his hardest to help you both escape. As you two were sitting there, you both heard footsteps approaching. You were terrified but were too weak to fight back but Abaddon was ready to attack until he saw the guy. A ghost in his mid-thirties with brown hair and a gentle smile who ran the Undervale. A hotel haunted by other ghosts.
Nathan: "Do you two need help?"