The Demon-Who-Lived

Important Message

A/N: Hello, everyone! Long time no see. I apologize for not updating in a while, like I said, I'm not a big fan of reading and writing, FanFiction is the only type of reading I do because it's entertaining while it uses very simple words. Don't worry, I'm intending to make some more stories, regardless if detail is lacking, (hey, I'm a teenager, you can't blame me).

Before I write anything else, let me tell you all something:

This story came into mind when I was watching Billy and Mandy episodes plus the reading of Harry Potter stories. It also occurred a couple of times when I watched the documentary of John Wayne Gacy. Creepy, I know. It also occurred a couple of times when I read 'The Child of a Monster'. This, as anyone would know, is an EXTREMELY rare story or crossover in which Nergal Jr is not the only child of the demon from the center of the Earth. And that's another reason I like this creation of the story, because it shows that Nergal can have 2 powerful boys who can crush their foes.

And as everybody can tell, this is the first of many things.

1. This is the first story of mine that's a crossover. I find them to be more interesting than regular stories because of the idea of putting something together in which you wouldn't commonly see.

2. The first story that's both adventure and family. I originally intended this story to be a fantasy, but I chose to keep that in small doses, because I'm not good at having original stuff, plus Hogwarts won't be appearing at all despite the appearance of magic. Also, I think having it set on the family would be cute.

3. This is the first Harry Potter and Grim Adventures of Billy and Mandy story I've ever done. I've seen all of the movies, (although I never finished Deathy Hallows Part 1 because it would just become extremely boring before I reached 1/2 of the movie.) May sound stupid seeing as how some of the other movies are worse, but I managed to sit through all of the others. I've seen some of Billy and Mandy as well, especially with the episodes where Junior has dialogue, and own the video game.

Lastly, If anyone finds this story bare bones because of minimal Billy and Mandy material, please tell me what I'm doing wrong, but don't rage debate because I won't if that's what it comes to.

I'm also aware that Harry Potter was spun off in the cartoon. Well, I'm gonna tell you, Toadblatt's School of Sorcery is present within this story, but it's going to have few appearances, like 2 or 3 chapters.

And to conclude, I know I said I wouldn't continue until my Metroid story was complete. I'm giving up on that, because that type of schedule feels to strict too me, and because I'm losing interest of finishing that story. It's also causing me to just enter the place as a reader, and leaving other things I could be interested in unfinished. I'm now finished with my message. To make it up that this was just a message that has nothing to do with the story, I'm going to use whatever time I have left to create a tiny prologue.

Disclaimer: I don't own Harry Potter and The Grim Adventures of Billy and Mandy. The former started before I was even alive, and the latter came out when I was only a child. Harry Potter belongs to Warner Bros., and Billy and Mandy belong to Cartoon Network, no matter how much the latter company is fucked up. This will be the only time the disclaimer is present in the chapters, so please go to this chapter to know, please.

Prologue

Deep inside the center of the earth was a home the size of a castle...it was a very scary place, especially since the residents were either demon or human. But who cared less of the house was aware that was some activity happening for the youngest resident going on.

Today was the day...today was finally the day...Nergal and Sis would send their son to the surface to interact with the other kids at Winter Camp.

Nergal, the husband, was a demon...he looked like the slenderman if he was colored, (not racist). He wore a black business suit, along with a black tie with a red shirt underneath. He also wore black shoes.

Sis, the wife, had bright red hair, which strangely looked orange, she had a massive nose with a pair of glasses. She wore a yellow fleece t-shirt with a green skirt that went down to her feet.

"Honey, are you sure Jr should go to the surface now? He's not even hatched yet?" The wife spoke with a voice that sounded as if any minute she would just suffer a stroke and die, which wouldn't be surprising because they lived in a home surrounded by lava, which could create a ton of ash.

"Sis, there's nothing to worry about, our son is smart and he's quick at knowing things. This is the perfect opportunity for him to fit in like a human, not a demon like me." the husband, a demon, responded with a smile. It was just a few months since they obtained a son, who they knew would be their only child.

"Yeah, but this is way too soon? Shouldn't we wait a little bit, like until he's hatched?"

"No, if he wants to live a human life, he'll have to start early, or else, he'll be like me, lonely, and just considered a discrimination towards his own people."Although he knew he said was true, his face came down a frown because he literally just himself with the truth until his wife came along. "And besides, he's 1/2 human because of his mother." He said, trying to not be upset over what just came out of his mouth.

"Can't argue with that."Sis responded with a small grunt. The two then left the living room where they waited a little before they officially planned to send their son towards the camp. They entered a small bedroom, which wasn't surprising that it was new. The bedroom had a child's bed, plus a dresser, a mirror on top, and a little chair to help sit down. Also present in the room was a stool.

A lime green egg wearing a pair of round glasses sat on the stool with a teddy bear at its side.

"Alright son, it's time to get going."Nergal said, kneeling down a little bit to make sure his son could fully hear him.

"But dad," the egg spoke, protesting against his father's wishes, "I don't want to go to town, I won't fit in with all of the other kids."

Nergal upon hearing this, just chuckled, trying to keep his confidence up, "Fit in? Son, why in the world would you think you won't fit in?"

The egg responded irritably, "Dad! I'm an egg!"

Using some of his will power, Nergal opened a portal that would send Junior straight to camp, "Don't worry son, it'll be a blast!" he responded, laughing while he and his wife waved their son goodbye. In a split second, both the egg and teddy bear disappeared in a flash.

Nergal had finally got something that made him happy...his son was finally going to head to the surface, meet his cousin, learn how to live as a human, and he knew Junior would make him proud...however...something misunderstood would later get him to unleash another half demon into the universe...

It started after they had dinner, and they had a bottle of whiskey. Afterwards, the two went to bed.

The next morning however, caught Nergal by surprise. He woke up to find his wife out of bed.

'Huh, maybe she got up early?'he thought as he left the bedroom. "Honey?" he called through his citadel of a home...

There was no response...Nergal checked all of the rooms in the house...but in the end, Sis wasn't home.

"Where could she be? She would've told me she was leaving to the store or something like that." Nergal panicked, as he tried to look for the reason she left.

He went to the garage, that surprisingly attached to the bottom of the house next to the kitchen, to head to the police station and report her "Missing" starting to believe that she was actually kidnapped in the middle of the night. The car however, was gone, but a tunnel was present above the ceiling, which looked liked it was recently made.

Nergal followed the tunnel, although it was quite hard to do since the entire following was completely black he couldn't see anything, 'Why the fuck didn't I bring a flashlight or a torch?' he wondered. For 2 hours, he went through the tunnel, until he saw a small bit of light coming from the top, surrounding a dark figure that had the shape that wasn't human.

Nergal approached the light, until he realized, the dark figure was just the car, left in a massive gaping hole in the ground, while the sun just brightened it over, showing the lovely, but not really town of Endsville, 'How could a kidnapper manage to steal my car, or even make a large tunnel towards my home? He or she would've needed help.'

The last sentence present within his thoughts whacked him like a knife in a gut...Sis WASN'T kidnapped...she used the car to leave town...

Nergal, with a very neutral look on his face, entered the car, surprised that Sis left it unlocked, although a possible explanation could be that no one would've been able to drive the car out of the hole. He then drove it down the tunnel the exact way he went up, before the car fell back into the garage. He then slowly stepped out of the car after turning the engine off, and locked it. He then made a whistle. Nergalings, Nergal's "friends" approached him. "Friends, please fix the giant hole in the ceiling, that hole is going to allow lava to run through the house." he commanded with a cold and anger felt voice. The minions listened before they set to work.

Nergal than entered his home, and walked to the kitchen. The kitchen itself was incredibly small, all of the equipment you'd usually see was present, (except a dishwasher of course), that it felt like a regular family kitchen home.

He walked to the fridge, and pulled out a bottle of vodka. He then proceeded down the stairs to the living room, drinking along the way.

Although it was only 10 steps, Nergal felt like he walked a hotel flight of stairs. The living room was quite normal sized, it possessed a massive TV hanging on the wall, above a fireplace, (don't ask) with a massive couch touching the back of the room. It also had a piano that was sitting in the far left of the room, almost untouched. The walls in the entire house was made of rock, mostly because it was a stone like house. In the middle of the room was a carpet, who possessed a variety of colors, like blue, red and orange.

Nergal, obviously being very drunk, slouched until he made it to the middle of the carpet...that was when he finally let loose.

He threw the half empty vodka bottle at the wall on his left, shattering it in the process, "SON OF A WHORE!" he screamed, so loud that it was a miracle his minions didn't hear him, it didn't matter though, he just wanted to wreck havoc all over the place. He caused massive tears into the couch with his snake-like tentacles, before he grabbed the piano and whacked it on the ground repeatedly until the instrument was nothing but wooden and string-like pieces.

He went into the kitchen, to take the dishes and smash them. He was just about to approach the cabinets when something on the fridge caught his eyes. He was lucky though, because his drunkenness was causing him not only to slide instead of walk, but his vision was also somewhat becoming difficult to see. He chose to ignore the drunkenness and went towards the fridge.

A note was present on the door, 'So she did leave some communication to let me know.' he wondered. He tore the note off the door, before he sat in one of the chairs of the kitchen table.

He then out of nowhere summoned a pair of glasses and put them on so he could read the small letters.

Dear Nergal,

I wanted to inform you I'm taking a small vacation to Alaska. I felt like because our son was sent to Winter Camp, this would be a nice little time for all of us to have a small vacation alone before we would all reunite together in our home.

Once it becomes Saturday, I'll be gone. Don't worry about the car, just follow the tunnel, and you'll find it. Nergal, I love you a whole lot, especially since how well you could dance, but I'm just going to take a break because I spent a massive honeymoon with you that even though I have a lot of love for you, it becomes addicting, and I needed a little break. I'm not saying our love is bad, I just needed a little rest before our son comes back home. I just hope you know I'll always love you, and I shall return once the weekend's over.

Good Luck, and I'll see you Sunday evening.

Love, Sis.

After re-reading the note 3 times, Nergal crumbled up the note, and tossed it in the trash. 'Why the fuck didn't she tell me?!', he thought, letting the tears in his eyes fall out as he just sat on the bed, feeling very, very, VERY defeated, and at the same time, very angry that if it was measured with bricks, it would go all the way up into space.

Before he found the note, he was extremely angry, now he just felt both depressed and ashamed. He just laid his head on the table, letting all of his tears sink out. His wife, his only friend...even though it was for a time...GONE.

"Why didn't she tell me? I wouldn't have minded!" he cried, although he knew that wouldn't be true, because he would feel lonely, and refuse to let her leave alone.

A few moments had passed, but during those few moments, a belief began to grow in Nergal's mind, almost like it was there to begin with. 'She abandoned me!' he angrily thought, 'No wonder she didn't tell me! She wouldn't have gotten the chance to escape me!' He held his head up, and began to think of bringing more destruction. But his love for Sis began kicking on quickly, that he couldn't and didn't. Even though this thought was in his mind...he in the end couldn't hurt the woman he loved the most, it did hurt like someone snapped his neck, especially since he felt like Sis was the only woman for him...he guessed even the woman who was only for him, could hurt him too.

"I am so fucking mad." he said, wheezing...

"I guess I'll have to find someone for the weekend seeing as how both my wife and son are gone." He said with a voice so weak, he could've died, and so, Nergal went to the small computer room, and began looking for someone to find for a friend.

Little did anyone, or even Nergal knew, that this misunderstanding, would cause the birth of another child from Nergal's flesh and blood, because the lonely side of the man had no idea of what being alone for vacation felt like. All of his anger blocked his way of knowledge that Sis would never hurt him, but the news felt like pain to his whole body, it just hurt so much that it DID feel like she just left him. It hurt just too much.

The next few actions he put into reality would damage his and Sis's relationship forever, it wouldn't be considered possible, even Nergal believed it wouldn't happen himself until he eventually got along with it.

But still, even if he didn't know, he would cause another demon spawn...to enter the world...and eventually 3 years later...the real Boy-Who-Lived, would be revealed...

A/N: Review, Favorite this story, and like me if you want too, I don't care, feel free to post a review, it would be nice if someone actually left of what they think of the story instead of me thinking that everyone sees it as a big pile of shit.