A temporarily petrified Rose Weasley stood in from of her. Lily Potter felt horrible for doing this to her cousin, but she'd picked out the perfect costume, and her cousin would never wear it by choice. Rose wasn't a stick in the mud, and she certainty wasn't a virgin, but she was always the good one, who never broke rules. She had a nerdy-chic style and was responsible to an extreme. Lily supposed that was what made her a good Head Girl, but it wasn't what would make her the sexy star of her eighteenth birthday party. And since she wouldn't do it on her own, it was Lily's job.
She was all dressed and blindfolded before she came to.
"Lily! What are you doing! Why am I blindfolded! What's going on?!" Rose was mad. And cold.
"Rosie, just calm down. Trust me." Lily lead her out of the Gryffindor girl's dorm, where she'd been keeping Rose all afternoon. As they entered the common room, Lily removed Rose's blindfold.
"SURPRISE!" Rose heard as all her friends and family popped out, disguised in costume. Their happy, excited faces faded into expressions of awe. Behind Rose, Lily beamed with pride.