Disclaimer: I'm not JKR, I don't own anything.

Prologue - Avada Kedavra

"Petunia, come back! Mummy said to swim close to the beach!" four-year-old Lily Evans called out to her big sister.

"What's the matter, Lily, are you scared a squid'll eat you?" Petunia taunted.

"No, I just think we should listen to Mum. She wouldn't have said it if she didn't care about us."

"Don't be such a goody two-shoes, Lily."

"Okay, 'Tunia, but I'm only following you because Mummy said that we should stay close together."

"Do you see that rock down there?" Petunia said, pointing to a rock jutting out from the middle of the lake. "Last one there is a rotten egg!" Petunia dived into the water and began swimming furiously, trusting her little sister would eventually follow.

"But 'Tunia, Mummy said." Lily stopped midsentence as Petunia began to flail her arms in the deep murky water.

"PETUNIA!" Lily screamed, as she began pumping her little arms and legs as fast as they could go.

I'll never get there in time. I'll never make it. Petunia will drown, and it'll be all my fault.

Lily blinked, and she was somehow right next to her sister. Lily pressed her small body against Petunia's, forcing her to breathe air. Petunia spluttered and a fountain of water came streaming from her mouth.

"LILY! Why did you do that?"

"WHAT? I thought you were drowning!"

"I wasn't drowning. Look over there," Petunia said, pointing to the beach. "Do you see the guy in the blue swim trunks, the one with sandy hair?"

"There's lots of guys with sand in their hair, 'Tunia."

Petunia sighed a long exasperated sigh of frustration.

"Honestly," she said, dragging the word out. "Little kids. He's a boy, and he's cute! I said he has sandy hair not just because he has sand in his hair, but because his hair is the color of sand."

"Oh, I get it. Um, 'Tunia?"

"WHAT, Lily?"

"Isn't that Mum coming down the beach?"

"So?" Petunia challenged.

"Well, she said we had to stay by the beach. And we're kind of in the middle of the lake."

"Lily, stop worrying. What's she going to do, lock us in a closet and make us be her personal slaves? I don't think so."

"No, but she will be worried. I think we should go back."

"Well, I think you should stay here. In fact, I know exactly how to make you stay here, and how to fix the mess with the cute boy. Now, start waving your arms up and down."

"NO! That's stupid. I don't want people to think I don't know how to swim."

"But if you pretend to be drowning, then Mum might forget to be mad at us."

"She won't be mad at US, 'Tunia. She'll be mad at you for dragging me out here."

"That's what you think, you little witch," Petunia said, slapping her sister's face. "If you're not gonna help me, I'll just have to do this myself."

Petunia drew a deep breath and started screaming. "HELP! HELP! My little sister is drowning!" as she pointed to Lily.

"Please, help us! PLEASE! SOMEONE SAVE HER!" Petunia was so involved in her screaming that she didn't notice Lily slowly swimming towards the shore.

Lily hopped up on the beach, unharmed, just as the cute boy reached Petunia.

"Where's your sister?"

Petunia looked at the water around her and noticed that Lily had disappeared.

"I don't know, handsome," she said, slinging her arms around his neck, "but I could use some rescuing."

"PETUNIA ANNE EVANS! GET OUT OF THE WATER RIGHT NOW!" Lily frowned as Mum began screaming.

Maybe I shouldn't have come up to the beach. I got 'Tunia in trouble and now she'll be mad at me. I should've just stayed right there in the water with her.

Petunia slunk up next to her mother, holding hands with her "rescuer."

"Petunia, let that boy go. You and I need to have a serious chat."

Petunia stuck out her tongue at Lily as Lily suddenly wondered how she had swum across the lake so fast.