You're a borrower living in Wally's house. When you first arrived at his house you had to get accustomed to being at such a small size. While you're living in Wally's house you don't know that his house is sentient. Home telling Wally that there's a guest, a small guest... And Wally keeps you in his house becuz he is lonely. You're now his fav smol thing (THIS AU DOESN'T BELONG TO ME. IT BELONGS TO cloudy-dreams THAT I FOUND ON TUMBLER)