A/N: This may be a long while to update for some, others, really quick. Oh well. This may come as a shock to you, but I don't own PJO.

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I glanced at the girl who was apparently my sister. I didn't even know her name. However, I had to admit she did look a lot like me. Finally, after five minutes of an awkward silence, I asked, "What's your name?"

Startled, she turned towards me. "Enna."

"Last name?" I asked.

"Raleen." She said. Unusual, but pretty.

"Enna Raleen? Nice to meet you." I held my hand out for her to shake. She hesitated before taking it and shaking.

I cocked my head at her. "Is something wrong? You seem a little… off."

"Oh?" she asked distractedly. I could tell she was busy thinking about something, but about what, I couldn't tell.

"Yes. You do." I said.

Enna blinked. "I'm sorry about that, then."

I caught a sidelong glance she gave me that seemed to say, You're the one who should be sorry.

"Really. Is something wrong?" I asked. Now I was worried. Had I unknowingly done something to anger her?

Enna turned towards me again. "No, just… thinking."

"About what?" I tried. Would she trust me enough to let me know what?

"My mother." She sighed. "And how she died."

That caught me off guard. A lot of our mortal parents were single, but very few were actually… dead. It was hard to imagine living without my mom; she was too sweet and kind.

"How?" I asked.

She turned away. "You really wouldn't want to know."

"I do," I insisted.

She glared at me, anger blazing in her eyes. "Fine. You killed my mother."

I was absolutely shocked and puzzled. "What did I do?"

"You. Killed. My. Mother." Enna hissed. "And you laughed about it afterwards."

I tried to imagine all the people I had killed. It wasn't possible; Riptide couldn't harm mortals.

"You really don't know, do you?" She said sarcastically.

I shook my head no. I had no clue what she was talking about.

"Fine. Let me give you a hint. You were twelve, and you walked into a warehouse. A lady with a veil came to seat you. Ring a bell?"

I finally realized whom she was talking about. A memory stirred in the back of my mind: My name is Aunty Em.

Enna's mother was Medusa.

Medusa had a kid? It seemed impossible. No one could ever love a creature as hideous as that.

But my father had loved her, when she wasn't a monster. Was it really possible? If I had ever wanted proof, Enna seemed to be it.

Suddenly, I was frozen in place. I couldn't move.

Enna waved a hand in front of my face. "Damn," she cursed. "Happened again." She left the cabin, cursing all the way down.

Of course, I couldn't do anything, as I was practically paralyzed. I guessed Enna had inherited her mother's power to freeze people, but maybe not to turn them to stone, as I could still think.

Suddenly, I could move again. I ran over to the Athena cabin, looking for Annabeth. She was in there all right. "Annabeth!" I called.

She jumped and looked around, searching for the source of the voice. She spotted me and came out of the cabin. "What, Percy?"

I looked around nervously. Maybe Enna hadn't wanted me to tell, but she lost her right to silence when she froze me. "You know the new girl, my half sister, Enna?"

Annabeth nodded, confused.

"Her mother was Medusa."

Annabeth laughed. "Nice try, Percy, but I'm not falling for that."

"What? I'm serious, Annabeth. Enna told me that I killed her mother. And she froze me in place."

Unfortunately, when I said it like that, it was a pretty weak argument.

"You may have just been nervous, that's all, or your ADHD might have acted up. I mean, it's very unlikely that she actually froze you."

I finally thought up a convincing side to argue. "That may be true, but Riptide can't harm mortals. It can kill monsters. She told me I killed her mother. That means that her mother can't have been all mortal."

Annabeth sighed. "Percy, even if that were true, how likely do you think it is that Medusa was her mother?"

Gods. She can make me feel so stupid at times. "Very unlikely," I mumbled. "But I swear, she practically told me so! Why don't we go ask her herself?" I thought up a good way to make Annabeth see the truth.

Annabeth shrugged. "Fine, if you can find her."

I smiled. "I bet I know exactly where she'll be."

/*\

Ten minutes later, we found Enna where I predicted, at the beach. She was sitting in the surf, letting the waves wash over her. She faced out into the open sea.

"Enna?" I called. I didn't want to upset her again.

"Hello, Percy." She said, her voice eerily calm. "I'm sorry I froze you."

I smirked at Annabeth. Told you, I mouthed.

Annabeth glared at me, then said, "Enna? Are you really the daughter of Medusa?"

Enna nodded with her eyes closed. I went around her, to in front of her. She opened her eyes at me, and they were glowing a pure white. That scared me. Suddenly, I was wrapped up in a wave. And it wasn't my doing.

Now, I was fine with that, being a son of Poseidon. But I could tell that Annabeth was also in the wave. And Annabeth can't breathe underwater. I used a current to propel myself over to her, and I made her an oxygen bubble. I put it around her head and she gasped gratefully. "Thanks, Seaweed Brain," she said.

I propelled myself back over to Enna, and put a hand on her shoulder. She looked at me, and her eyes turned their normal sea green. The wave dropped us and we flopped down onto the sand.

I crawled over to Annabeth and hugged her.

"Percy," she said. "What if something like that happens again? What if she loses control?"

I looked into her stormy gray eyes. Right now, they weren't mysterious, just a little scared. "I don't know, Annabeth." I glanced over at Enna, who had curled herself into a little ball.

I let go of Annabeth and stood up, walking over to Enna. She was crying freely, tears flowing down her face.

"I'm so sorry, I'm so sorry, I'm so sorry," she was saying, over and over again. She looked up and saw me. "Oh, Percy, I'm so sorry, I didn't mean to, it just-"

I put a hand up, telling her to stop. "It was an accident. I get it."

She buried her face in her arms and sniffled. "It's just such a terrible way to spend a birthday."

Annabeth gaped. "Today is your birthday?"

Enna looked up. "Yes, and it's definitely not how I wanted to spend it."

I smiled, an idea forming in my mind. "Then why don't we make the most of the rest of it?"

The rest of the day was spent celebrating.