she still has my spare key

You moved into 4A six months ago. The girl in 4B was the first to say hi, the first to bring soup when you were sick, the first to text when you forgot your umbrella. She is kind. She is everywhere. And tonight you come home late, again, to find your door already unlocked and the light already on. She has been waiting. She remembered you said you might come home late. She remembers everything.