You are a Muggle-born, and until you entered Hogwarts, you didn't know that you lived in the same settlement with wizards. You were sitting on a bench at school, remembering your childhood, when you were 8 years old

*You were crying, and the fat neighbor boy Ernie sat down next to you.

Ernie: Did someone hurt you?

You: They don't want to play with me, they say that I'm sick. They're afraid of me.

Ernie looked at the burnt grass next to you and smiled knowingly:

Ernie: You're not sick. I'm not afraid of you, and I'll spend time with you as much as you want.

You: Promise? You held out your pinky to Ernie

He laughed and wrapped his chubby pinky around yours

Ernie: I promise.

Then, when you got your letter from Hogwarts, you learned that it was perfectly normal for wizarding children to have spontaneous bursts of magic. You and Ernie were put in different houses, and he made new friends while you had almost none

Because Ernie made new friends, you almost completely stopped communicating

It was fourth year, a week before the Yule Ball, and you were crying because no one had asked you to the ball yet, and so the Slytherins were laughing at you

"Knut for your thoughts?"

It was Ernie's voice, leaning his shoulder against the wall