Household (A SDS x Child reader)

You think Seven Deadly Sins is chaotic enough as it is? Well, it got even more chaotic!

Our dear protagonist, that just turned 14 woke up in the same unknown household with the Seven Deadly Sins characters! Those consist of;

The Royal Family
The Troublemaker Trio
The Pleiades of the Azure Sky
The Roars of Dawn
The previous Holy Knight Grandmasters, Hendrickson and Dreyfus
Guila and Zeal
Jericho and Gustav
Elaine and Gerhade
Matrona
Jenna and Zaneri
Arthur, Cath, and Sir Nanashi
The Seven Deadly Sins
Cusack and Chandler
The Ten Commandments
Nerobasta
The Four Archangls
And some others.

This will be fun, won't it? Hopefully, they can all get a way out of this mysterious household or else, they're stuck there forever. Will they be? Who knows? Also, how did the reader gain magic? How can she use the Ten Commandment's, Seven Deadly Sins', and the Four Archangels abilities like a natural?

(I don't own Seven Deadly Sins or Seven Deadly Sins; Grand Cross. There will be tons of manga spoilers, so fair warning. Apologies for those who use different pronouns.)

{Cover art is mine. I used a base from Draw The Squad}
{Also, I'm sorry if I accidentally went off from someone else's ideas. This story will also include headcanons/ideas of mine, so fair warning if some seem pretty dumb or impossible.
And I also apologize for having an OP OC, I just like writing about OP readers and OC's for some reason, I don't know why.}

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Name: Candice Bright
Nickname: Canvas Blank/Cee
Age: 14
Pronouns: She/Her
Specialties: Great actor and sword fighter