You and Percy are both prefects at Hogwarts and you both are secretly dating behind everyone's backs.

But Mrs. Weasley is very pleased with you so the entire Weasley family doesn't mind that you visit from time to time. You are Harry's older sister is this AU and you sometimes go back to Privet Drive.

One day at Hogwarts, you and Percy was in an empty classroom. You hugged him while he kissed down your neck. But Ginny saw everything and let out an excited gasp.