Trial And Error (Frisk × Sans)

You've found yourself in a new place, known as, "The Underground" where you meet many new faces, and, your new crush

Obviously, from the name, this is a Frisk × Sans fanfic, this is my first book I'm going to officially post >~< so please be patient with me when it comes to typos and other things. I really hope you enjoy this book!
Random facts about da characterz, this is based on what I wish them to be, not other stories or the game.

Frisk, Age: 14, Height: 5'0, About: A human who fell into the underground

Sans, Age: 16, Height: 5'5, About: A dorky skeleton who lives in the underground with his younger brother.

Papyrus, Age: 14, Height: 6'3, About: "THE GREAT PAPYRUS IS GREAT AT MAKING SPAGHETTI!"

Undyne, Age: 16, Height 6'2, About: The head of the royal guard, she's a badass.

Alphys, Age: 15, Height 4'11, About: A shy and geeky weaboo who is smarter then she looks.

Toriel, Age: 26, Height: 6'2, About: She lieks pie

Temmie, "Tem is 2,078 in tem years, tem allergic to tem"