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A... Family?

Summary:

Frisk has returned to the surface with the monsters, and their first order of business is to have Toriel adopt their older sister into the family.

Full of fluff, angst, panic attacks, and all the glorious messed up problems that every fic deserves. Yay!

Notes:

Y/n is your name.
My name for them is Arden, if you want to use that.

Frisk is 12 years old, and you are 17 3/4

(See the end of the work for more notes.)

Chapter 1: Prologue

Chapter Text

You and Frisk were hiking. Mt. Ebott was a two day climb, and a great way to get away from your father for the weekend. It also wasn't nearly as dangerous as people said. At least, that's what you thought

"Y/n?" Frisk asked, and you turned to see them sign 'how long?'. 

"Ten minutes, I think. Can you hold up?" Frisk nods, and you turn back to the path. 

"So, there was a mollusk and a sea cucumber." You start, and Frisk groans good-naturedly. "The sea cucumber looks over to the mollusk and says 'with fronds like these,'-

"'Who needs anemones.' I know. You've told me that one a thousand times." Frisk finishes. You shrug.

"What can I say? It's a classic."

It's not until four hours later, after the tent has been pitched and the sun has gone down that Frisk goes missing. One minute, they are going to use the bathroom. The next, they're gone and you're searching the entire mountaintop. You stay up there for three days, searching, until you're forced to go back home out of sheer hunger. 

You try to tell your father. He just hurts you until you are numb with the pain. You try telling the police, but they either don't believe you, or believe your father more. You try telling Frisk's teachers. They give you their sympathy, their condolences, and nothing else.

So you have to find them yourself.