"Percy, we're going to be late!" Annabeth Chase shouted up the staircase. She sighed. Even after all these years, he was still considered the hero who saved Olympus, but honestly, sometimes he acted as if he were still twelve.

"I'm coming! Just a sec," he called back. Annabeth sighed. That meant he was going to take at least half an hour. Just as she was starting to have a seat, the doorbell rang. She stood up and hoped beyond hope it was who she thought it was. She opened the door and was relieved to see her cousin, Nico, standing there.

"Thank the gods you actually made it on time," she said letting him in. "Thank you so much for doing this on such short notice."

"No problem—" he began, but Annabeth cut him off.

"Ok. So, there are the basic things," she said as she gestured for him to sit down. He did and tried to remember what she was about to say. "Dinner at seven; bed by nine. Its all written on the fridge. Also, make them do their homework. Luke will start to complain and make excuses, of course…"

"Wait. Who?"

Annabeth looked at him in surprise. "Luke. My eldest son." Seeing the confused expression on Nico's face, she sighed and turned to face the staircase again. "Luke! Bianca! Charlie! Get down here. We have a guest!" She turned back to face Nico.

"I like their names," he said smirking.

"Yes, well, Percy did too," she replied smiling. "Kids, we have a guest!" she shouted again and sighed. "So, where was I? Oh, right. So, dinner, homework, bed…did I miss anything?"

Nico started to answer, when they heard footsteps on the stairs. He stood up to see a girl of about twelve years old standing at the foot of the stairs. She had her mother's stormy gray eyes and her father's black hair. A second later, a boy appeared behind her. He looked exactly identical to the girl, save for his green eyes and brown hair. He was even the same height.

Annabeth gave Nico a small smile, and walked over to them. "Nico, these are Charlie and Bianca. They're twins. Kids, this is your uncle. He'll be watching over you while your father and I are out."

"Hi," he said. He had to admit he was a tad nervous. He was never really good with kids, and it didn't help when they were looking at him weird.

Bianca was first to answer. Her hair was tied back and she was wearing those goggles chemists would wear when dealing with chemicals. "Hello," she said waving cheerfully. She turned to Annabeth. "Hey, mom, I kinda need to go finish something—"

"Bianca Jackson. This is the first time you meet your uncle. The experiments can wait."

"But mom—"

"No buts. Charlie?" she turned to her son. "Same goes for you."

"I don't do experiments," he muttered.

"Just say hello, Charlie."

"Hello," he mumbled.

Nico nodded in his direction. Charlie was staring daggers at him, and his mouth was set in a thin line. Annabeth sighed. "Bianca, dear, will you please call—" the rest of her sentence was drowned out by her own yelp of surprise, as a flash of silver came zooming down the stairs and towards Nico. He stood frozen and staring at the black hilt of a dagger, which had impaled itself in the wooden front door just millimeters from his face.

Annabeth, on the other hand, looked furious. Her face was flushed and she was shaking with fury. "LUKE!" she screamed. A blonde haired boy came running down the stairs, and for a second, Nico's hand itched to take out his sword out of the cloak he was wearing.

"Oh, my god, oh, my god, oh, my god," he said, looking at the dagger and Nico with an agitated look on his face. "Dude, I am so sorry. Are you ok?"

"Don't worry about it. I'm fine," he said quietly. Now that Nico got a better look at him, his instincts relaxed. The boy looked like something between a punk and an Englishman. His hair was sticking up like he'd been shocked, and he wore a long, moth-eaten frock coat with a million pockets and a black t-shirt under it. He had an empty scabbard hanging on the waistline of his ripped jeans.

Annabeth was beside herself with anger."WHAT DID I TELL YOU ABOUT USING WEAPONS IN THE HOUSE?" she shouted. "YOU COULD HAVE KILLED HIM!"

"At least he's still alive," Luke said, obviously relieved. He gave Nico a searching look. "Um, who are you, exactly? And why are you wearing a cape?"

Nico took the dagger out of the door and examined it. "I am your uncle, but you can call me Nico. And this is a cloak, not a cape. We're not superheroes you know."

Luke looked at him again. Not only did he have Annabeth's eyes, but he even looked like her, if not for the scar that ran down his left cheek to the top of his neck.

Before Nico could comment, Percy came down the stairs wearing a suit. "Hey, Nico," he said and shook his hand. Then he turned to Annabeth. "Annabeth dear, care to explain why I could hear your voice from the bathroom?"

"Luke was throwing knives again."

"It's a dagger," Luke mumbled.

"Luke, don't answer back to your mother. And how many times did we tell you not to use weapons in the house?"

"You're the one to talk. I found a sword in your office the other day, dad. A sword. And you're telling me not to use weapons?"

Percy shifted uncomfortably. "That's enough. Now listen to what your mother has to say."

Luke was about to protest, but seemed to think better of it. Annabeth smiled at the way Percy could calm their children down as easily as his father could the ocean. A feat she was nowhere near achieving. "Alright. Luke, Nico is going to watch over you three for the few hours that your father and I are out. So, we're going to have to make a few changes. So no experiments," she looked at Bianca, "or going into the basement," at Luke, "and you will do each and every thing Nico asks of you. Is that clear?"

"Not really," Luke said. He just couldn't seem to shut up. "Why are you getting a babysitter? I'm fifteen, I can take care of myself."

"Nico is not a babysitter. And its not a question of whether or not you can take care of yourselves. I know you all can, but this is important."

"Why?" Charlie asked.

She leaned down and gently touched his face. "It just is. You have to trust us."

Charlie looked at his mother in confusion, but Nico thought he knew why they were so worried. Being the children of demigods was not something their neighbors had experience in, so if anything happened, normal mortals like them wouldn't know how to deal with it. He on the other hand, had experience in fighting everything from monsters to titans. Plus, he had the cool cloak.

"Ok," Charlie said simply.

"Ok," Annabeth repeated, smiling. "So, we're going now," she and Percy gave each child a kiss, though Luke pulled away complaining that he was too old for that.

"Bye," she said, waving.

"Bye," the three children replied in unison.

"I'll take you to the car," Nico offered. What he really wanted was to ask something that was nagging his mind for a while now. As the three walked across the lawn to the car they were silent.

Before Nico had the chance to say anything, however, Annabeth turned to look at him. "Don't worry about them doing anything crazy. Bianca's experiments usually turn out alright. She has a knack for those kind of things. And Luke won't do anything around you now, having nearly killed you."

"What about Charlie?" Nico asked.

Annabeth bit her lip. Finally she said, "thing is, Nico, we decided not to tell them about…well, you know. Anything. Luke and Bianca are doing fine, even though Luke's dyslexic. No monsters around them at all, though, thank the gods. But Charlie…well lets just say he might as well be a demigod, the way things are going for him."

"He's clear-sighted?" Nico asked surprised.

"He must be. This is his seventh school in seven years," Percy said.

"Like father like son," Nico said smirking.

"Oh, be quiet Nico," Percy retorted.

"Basically, we just need you to keep them alive until we get back, ok?" Annabeth said.

"Sure thing," Nico replied, as she opened the door and got in the car.

"Oh, and Nico?" Percy said.

"Yeah?"

"Try and get through to Charlie. We've tried, but being his parents, he wouldn't listen to us."

"I'll try. And try not to have to resort to weapons and mist," he replied smiling.

"Thanks. Same goes for you." And with that, he got in the car, started it, and drove away. Nico looked after them for a minute, then started walking back to the house. He had a bad feeling about this.

A/N: Oh-kayy… This story came to me really quick, and I decided to write it down and see how it goes. I'm not really liking this chapter, so it might be discontinued. Please tell me if you want a continuation or not in a review or a message, 'cause if you don't I'll probably just take it down.