Chapter One: Iniuriam

Silence ensnared the room, not a noise at all in the Black's house on 12 Grimmauld Place. Harry himself felt a wave of disbelief hit him; surely Dumbledore was mistaken.

Finally, Sirius expressed what everyone else in the room was feeling.

"Are you bloody serious?"

"Not at all, I believe my name is Albus Dumbledore. You are Sirius," the well-known Headmaster of Hogwarts stated, the ever-lasting twinkle in his eye not quite as bright as it usually was.

"I think what he meant to ask," Arthur Weasley started weakly. "Was if you could please repeat what you just said, because it seems some of us misheard."

"I don't think any of you misheard at all," Dumbledore said easily. "But, if I must, I will say it again. It has recently been discovered that Lord Voldemort has a daughter, and from sixteen years ago, has a grandson. They both currently live in America, New York, New York to be exact."

Harry glanced at Ron and Hermione, and felt slightly relieved and extremely dreading when he saw that he wasn't imagining things, if the expressions on their faces meant anything by it.

"It seems that Voldemort has also noticed this recently, and seeks to find and recruit his family. Whether it is because his intends to make his grandson his heir should anything happen to him, or because he is extremely powerful and wants to make him a Death Eater, his reasons are unknown."

"How do you know his grandson's powerful?" Hermione, ever the rational one, asked, catching every little detail.

Here, Dumbledore hesitated, as if debating whether or not he should depart with the information he had. Of course, seeing as a few people in the room had hot-heads, it was to be expected.

"His school records," Dumbledore admitted. "He has quite the past. He's gotten kicked out of school every year except for the past two years; he has managed to stay put in the same school for once. Even then, during orientation for that school, he apparently was involved with an explosion. And…well, when he was twelve, it seems he got in a situation where he was kidnapped along with a few other children and forced to travel across the country with a madman."

It sounded incredibly ridiculous, even for a wizard like Harry. Because, really, it seemed way too coincidental that the grandson of the Dark Lord himself just happened to get kidnapped.

"Of course," Dumbledore continued. "That is only scraping the list of things he has done."

"And what about the mother?" Lupin asked, an unreadable look on his face.

"She seems to be a Squib, and is described as a 'beautiful young woman who had a misfortunate life, but has the kindest heart you could find around.'"

Ron and Sirius had dubious looks on their faces, as if finding that hard to believe, and truthfully, Harry was pretty sure he had the same expression on.

"They're probably just as evil as You-Know-Who," Ron muttered under his breath, but loud enough for the other occupants of the room to hear.

"Ron!" Molly abashed her son, although she seem like she was thinking along the same lines. At least for the grandson, since he seemed to be a troublemaker and dangerous.

"Ron's right," Sirius said almost immediately, and Harry found himself nodding.

"I don't know about the daughter," Harry said slowly. "I mean, from what Professor Dumbledore is saying so far, she seems like she's pretty uninvolved compared her son. I mean, really, he seems too suspicious."

"Looks can be deceiving," Dumbledore said, and he looked a bit disappointed. "And Sirius, you should know that, seeing your past."

Sirius looked slightly embarrassed, but he was insistent on his opinion. "You can't deny that the boy is probably already on Voldemort's side. You can't have all that stuff happen to you and just be a normal kid."

"Moving on to other matters," Dumbledore said, shooting a warning look at Sirius. "I have informed you of this to let you know that the daughter and grandson are going to be staying here for a while. This is for their well-being and making sure that Voldemort does not contact them."

Harry had a feeling this was going to be a long night.

~*o8o*~

Harry, Sirius, Lupin, and Dumbledore were decided to be the ones to explain and escort the two; Harry, because it could lower their guards if a fifteen-year-old was there, not to mention that the grandson would be around his age; Sirius, because he insisted he come since they were going to be staying in his house; Lupin, to, well, make sure Sirius didn't do anything drastic; and Dumbledore for obvious reasons.

Harry stared up at the apartment building that held Voldemort's flesh and blood, and he felt something stir inside him. After the shock of hearing the news, he began to feel angry. Indescribable hatred boiled, but he pushed it down. Yelling at them isn't going to get them on our side, Harry reminded himself.

Dumbledore entered the building, his companions following him. After going up a flight of stairs or two, he walked down the hallway, looking for the right door. He stopped at one, and promptly knocked on the door.

Harry twitched, feeling nervous, and with a quick look at Lupin and Sirius, they were too. The only one who seemed completely calm about the situation at the moment was Dumbledore.

The door opened almost immediately, as if the person behind it was expecting someone to come, and Harry heard a female voice say, "Per-" and abruptly stop as if seeing it wasn't who she thought it would be.

The door opened more, and Harry was able to see the person behind it. Sparkling blue eyes looked at them, and Harry almost swore they seemed to change color in the light. Observing the woman in front of him, he saw that she had long, brown hair, a warm but tired smile, and a few gray strands in her hair, but otherwise looked beautiful.

"May I help you?" she asked politely, although she seemed slightly disappointed.

"Would you happen to be Sally Jackson?" Dumbledore questioned.

Harry and Sirius exchanged glances. This must be Voldemort's daughter.

The now-identified Sally looked hesitant, as if searching for a trick in his question. "Actually, it's Sally Blofis now," she said slowly. "I got married recently."

"My apologies, I didn't know. May we come in?" He gestured to the other three.

Sally frowned. "What do you need?"

"Actually, it concerns you and your son. Percy, correct?"

Ah, so that must be the grandson. Percy. Not exactly a normal name, but better than Voldemort.

Sally looked immediately concerned, and she opened the door wider so they could come in. "Please sit down in the living room," she said. "I'll get refreshments. Will water be alright?"

"Water will be fine," Dumbledore assured her.

After she left the room, Lupin said, "She certainly isn't what I thought she would be."

"That's for sure," Sirius agreed, looking slightly shocked. "I thought she would be some evil hag like Bellatrix."

Before Harry could say anything, Sally came back into the room with six glasses of water balanced on a tray. She set them down, before settling down on a couch across from the wizards. A moment later, a man entered to the room.

"I'm Paul Blofis," he said at their questioning looks. "Sally's husband, and Percy's stepfather."

Dumbledore nodded. "I think young Percy needs to be here when we discuss this. Could you fetch him?"

Sally and Paul exchanged a look. "Actually, Percy is at his summer camp. He's supposed to come home any minute now. I thought you were him at first." Sally looked slightly embarrassed and apologetic.

"Summer camp?" Harry just had to ask; summer camp didn't seem like the type of thing Voldemort's grandson would do.

Sally's voice became warm. "Oh, yes, Percy loves it. He says it's like a second home to him. He considers everyone there his family."

At this, Sally and Paul looked at each other with amusement, as if there was an inside joke only them knew.

Just as Dumbledore opened his mouth to say something, there was loud knocking on the door, and without waiting, the door slammed open.

"Mom, Paul, I'm home!" a teenager's voice called, slightly muffled from across the hall and through the door. "Sorry I'm late, we stopped by this gas station on the way back, one of those ones with the convenience stores, and, well, Travis and Connor got out of my sight for like, half a minute while I went to get the receipt, and I swear those two nicked half the stuff in that place and stuffed it in the back, so we had to go and put it all back without anyone noticing. They just dropped me off in front. Oh, and Annabeth says hi."

Paul looked like he was trying not to laugh, and Sally just shook her head like stealing from convenience stores was the most normal occurrence she had had all day. "Percy," Paul yelled, "We're in the living room. We have guests, so try not to set anything on fire!"

A boy, probably a year older than Harry, popped his head in the living room and rolled his eyes before composing himself and sliding an easy-going grin on his face. "Um. Welcome to my house!" He directed this to the visitors on the couch. Then, he frowned. "Or maybe it's 'welcome to my apartment.' Either way works." The grin settled back on his face, and Harry took a moment to size him up.

Percy had unruly hair – even more so than Harry's. It was jet black, and if he looked closer, there were fading streaks of gray in his hair. He was taller than Harry, and more lean and athletic-looking. The most striking thing about him was his eyes – they were green. Not a jaded emerald-color like Harry's; they were sea-green. They seemed to reflect the sea in more ways than one – one moment they would be bright and mischievous, and the next they would be a deep green that knew things no sixteen-year-old should, like he had seen everything.

What caught Harry's attention was his movement. He was constantly moving; tapping his foot, scanning the room with his eyes, running his hand through his hair. Lupin seemed to have noticed too, and was carefully watching him.

"I'm Percy Jackson," he said, plopping down next to his mother on the couch. "So who are you?"

"I'm sorry, we haven't introduced ourselves yet, have we?" Lupin smiled, still keeping an eye on Percy.

"I am Remus Lupin, and this is Sirius Black," he motioned to the man next him. "The old man is Albus Dumbledore, and the young man is Harry Potter."

Harry looked closely to see if any reaction came from Percy at the mention of his name; there was none.

"We came here to inform you that you have the abilities of a wizard, and that you have been invited to study at Hogwarts School of Witchcraft and Wizardry."

Silence.

Then Percy looked at him with the calmest look on his face and said simply, "When?"

Uneasy, Harry twitched. He certainly hadn't been that calm when he had been told he was a wizard.

"School starts on September first," Dumbledore said. "However, due to certain circumstances I am about to explain, we wish for you to stay with some magical families until then."

Percy seemed to consider this carefully in his mind before saying, "Okay. I'm not accepting," he warned. "But if I do, I want to hear the whole story first."

Even Lupin looked slightly blown that he agreed to hear them out so quickly. Every expectation they had had of him, every move they were expecting to take, were being thrown out the window each passing second. He did the complete opposite of what everyone thought he would do.

So Dumbledore explained, about Voldemort, how the two descendants had somehow managed to escape the Wizarding World's attention, how Sally was most likely a Squib but Percy seemed to inherit his grandfather's magical powers, about the Order of the Phoenix, and how Voldemort was seeking his family out and how the Order would protect Sally, Percy, and Paul and keep them hidden.

And the whole time, even when Sally and Paul looked extremely shocked, Percy just sat there and bored his sea-green eyes through Dumbledore's head without so much as a flinch. Harry tried to decipher the emotions he saw go through Percy, but the only ones he could make out was the barest hint of irritation and…amusement? Like everything they were saying was something he expected. Like he was told he had an unknown evil Dark Lord as a grandfather every day.

After the explanation, Percy exhaled slowly and looked at his recovering family. "When will we be leaving?" he questioned, eyes flickering to Dumbledore.

"So you accept?"

"For now," Percy said, thoughtful. "You seem like you're telling the truth, so I'll trust you for the moment, but I want you to know that I can back out of this whenever I want." He paused, looking straight at the group. "Whether I have permission or not."

"Very well," Dumbledore said agreeably. "Then we will take our leave, and come to pick you up tonight. How does ten sound? You will have plenty of time to get your belongings together and contact your friends. The sooner we ensure your safety, the better, you must understand."

It had become apparent that Percy made decisions more easily than his parents and was more agreeable to changes, so while Sally and Paul were still mulling over the situation, Percy said, "I suppose we'll be seeing you later, Mr. Dumbledore."

Dumbledore smiled. "I would prefer if you called me Professor Dumbledore."

Percy was looking intently at Dumbledore before he smiled slightly. "Huh. 'Professor.' It suits you. You remind me of my mentor at camp."

"Really? If I may ask, how?" Dumbledore replied, amused.

"You both seem really cool for old guys."

Sirius muffled a snort, and Lupin's lips twitched upward.

Percy certainly was nothing like his grandfather, but that didn't mean he wasn't dangerous. Even when Harry told himself this repeatedly, he couldn't stop himself from grinning.

Noticing his grin, Percy flashed a smile at him, and said, "I hope we become friends in the future, Harry."

Harry somehow felt like he was betraying himself when he hoped so too.

So. This is my first crossover - no, wait. This is also the first time I have ever [seriously] written anything relating to Percy Jackson or Harry Potter. I haven't read either series in a while, but I am refreshing my memory of Percy Jackson first since I read the majority of the books throughout third or fourth grade, so apologies if I'm a bit rusty of my information.

Also, some things I would like to point out:
This will not have any HoO mentionings in this. This happens directly after the war in TLO, and I do not want any messages asking to catch it up to date. (Translation: Miss Crimson still hasn't read Mark of Athena and is extremely embarrassed about it.)
This also means that Percy still has the Curse of Achilles.
The title of this, Maleficium, is Latin. It means "wrong, harm, injury, mischief, malignancy, malignity."
The chapter name, Iniuriam, is Latin. It means "wrong." Coincidentally, is the first meaning of maleficium. May or may not be a pattern.

There are a couple more stories like this, except most of them need a lot of work. So now, I present to you, a slightly better "Percy is Voldemort's grandson" plot, with grammar and less OOC-ness! Please enjoy! (: Sorry for the long author's note, they won't be that long in any other chapters. Just had to get the basics out.

Reviews are appreciated. (: