Lily followed Snape to his classroom.
"I suppose you could just . . . read or something," said Snape.
"Okay," said Lily. "Which way to the library?"
"It's right up those stairs."
"Okay, thanks . . . um . . . dad . . . "
Lily ran off to the library. She checked out several books (including Hogwarts: A History, Magical Creatures of Europe, and several others).
After a half-hour or so, she reached Snape's classroom. She walked in, carrying her books and sat down in the back of the room. Harry sat at a desk between a girl with curly light-brown hair and a boy with blazing red hair.
Lily could hear a petite woman in a pink dress speaking to Snape.
"You applied first for the Defense Against the Dark Arts post?"
"Yes," he hissed.
"But you were unsuccessful in getting the job?"
"Obviously," he muttered.
The red-haired boy sitting next to Harry laughed. Snape smacked him in the head with a book. Lily laughed. The woman in the pink dress looked at her.
"And who is this?" she asked.
"I-I'm Lily," she said. "Snape's daughter."
"And what business do you have here? You're clearly too old to be here. How old are you, anyway?"
"Nineteen," said Lily quietly.
"You clearly don't belong here." said the woman. "Why are you here?"
"My mother abandoned me when I was a baby. Dumbledore said I could stay -- since I was Snape's daughter."
"You are not a student, teacher or staff member here so you have no business staying in this school. I will certainly speak to the minister about that."
The woman walked out of the room.