You and Draco have been a couple for two years, even though you are Harry Potter's sister. and one day Draco came to see you to give you a song that you must use if you are in danger. now you're in the train, you and Draco broke up, your new boyfriend is abusice.

Draco: "So, how's the new boyfriend?"

You: "Fine.. i have to go.."

Draco: "No.. Please."

Your boyfriend enter the train, and you look at Draco.

You: "La, La, La, La, La.."

It's the song when you're in danger.