Disclaimers: I do not own Gravity Falls

Author's Notes: Chapter 14 is finally here!

Thanks for reading, please review!

(Monday Morning…)

It was during first period that the madness had started.

Mabel who had a free period first thing in the morning was busy listing to Oskar as he played his keytar on the roof of his car in the parking lot.

"Mom, don't tell me what to do

I don't have to listen to you

I don't have to follow your rules

I'm gonna live in my car at the school, hey, hey!"

Dipper shook his head as he watched them through the window of his own first period class. He could hear Oskar through the glass as plain as day, and he was at the end of the parking lot. He suddenly wished he had a pair of sound canceling head phones. It wouldn't matter so much if Oskar was any good, the problem was he wasn't. "You know, I still don't know what she sees in him." He mumbled.

"Love is blind." Bill said. "At least that is what mother says."

"What does she say about hearing?" Dipper asked. It wasn't that he hated Oskar, he was nice enough. However, he was also a school dropout, and hated all authority figures. He was also loud, very loud and disruptive. So, while he liked Oskar, and he was fun to be around, right now while he was trying to work, Oskar was less than likable.

The bell rings around them.

Dipper pulls his eyes away from the pair and gets up. "Let's go." He says. "If I have to hear another Oskar original my ears are gonna fall off." He looks to Bill hopefully, only to stop dead in his tracks.

There was a small yellow triangle on Bill's forehead.

"You got a triangle on your face." He told him dumbly.

"Pine Tree, I have two of those." Bill pointed to his cheek marks. "They're called cheek emblems." He retorted. "You'd think a smart guy would know that."

"Not those!" Dipper snapped. "I mean you have another, on your forehead." He was close to strangling the demon teen.

Bill scratched at his head, then opened his hand. In it was the small yellow triangle in question.

"Dipper, this is not a cheek emblem." Bill said gravely.

Dipper is slow on the update. "Well if it's not a cheek mark then…" He stops, according to his demon studies with Ford, there was only one other thing it could be.

"Demonic puberty." Bill whispered ominously. More triangles appeared on his face, and he tried to hide them with his hands.

Dipper is now in full panic mode. "This is bad, this is really bad!" He exclaimed as Mabel comes walking in.

"Guys why are you still here?" She asked.

"Mabel we have to call Stan and Ford." Dipper exclaimed as he ushered a partly blinded Bill from the classroom. Of course, Bill is only blind due to his face being covered by his hands.

"Why what's going on?" Mabel asked picking up on their distress.

"Bill's Demonic puberty is starting." Dipper said as if it's the end of the world, and it was. Mabel just doesn't pay attention during Ford's lessons.

"What's the big deal? We have a similar thing on Earth." She began to exclaim.

"Mabel this isn't puberty." Dipper whispered, as students started giving them weird looks as they reached their lockers.

"Yeah don't confuse this with your Earth things." Bill shouted. "This is gonna get real weird…" his voice softened into a panicked whisper. "You gotta keep me away from any kind of flesh!"

"Flesh?" Mabel suddenly looks panicked as well, and for good reason. There was a reason why monsters and demons called humans flesh bags. "And just out of curiosity what would you do with said…uh flesh if you got some?"

Dipper pulls out a candy bar and devours it. "That." He said with a full mouth of chocolate.

Mabel had never pulled her phone out so quickly in her life. She dials Ford's number and waits fearfully.

Dipper would have called him, himself, but he was busy trying to block everyone's view of Bill. This was bad, this was really bad! No one on school grounds knew Bill was a demon, not even Principal Wong! If the secret got out Dipper knew it would be a school wide panic. Of course, the fact that Bill was about to start craving human flesh at any second wasn't going to help things. Worse, if Bill actually ate or bit someone…Man he didn't even want to think about that!

"Hu Pine Tree." Bill says looking a bit more maniacal than usual. "Your neck is looking mighty tasty all of the sudden."

Dipper whipes around at the speed of light, opens his locker and stuffs Bill in it before closing the door.

"Heh, heh, so when he says things are going to get weird, does he mean typical Bill weird, or 'destroy the school' weird?" Mabel asked still waiting for an answer.

Without hesitation, Dipper said, "Destroy the school."

And as if on que Mabel gets the voice mail notice form Ford's phone.

"Sorry, very busy now, most likely I am in my lab working on an Earth shattering discovery. Or Stanley did something stupid that needs my immediate attention."

"Hey!" Stan's voice can be heard in the background.

"You know what you did!" Ford's voice yells back before saying. "Leave a message after the beep."

BEEEEEEEEP

Dipper and Mabel gulped in unison; they were on their own!

The tardy bell rings, the halls are empty.

"We have to get him out of here now!" Dipper states. "While he is still somewhat sane." He opens the locker door.

Bill is covered with more triangles, but looks more insulted then flesh hungry. "How dare you!" He shouted. "I am the most insane person you will ever meet."

Dipper rolled his eyes as some of his fear is replaced with annoyance. "Really Bill? You should be taking this more serious!" He pulls Bill out only to scream in terror as some weird red and yellow goop of some sort shoots out of Bill's hand and sticks to the locker door.

Bill is also screaming, while Mabel looks on in confusion.

"What is that?" She cried.

"It's Metamorphosis jelly." Bill yelled. "It's supposed to cocoon me in and aid in my transformation."

"Mabes." Dipper says. "You really need to start listening."

"Dip, you know I zone out unless he uses the word glitter in every other sentence." Mabel reminded him.

Dipper face palms. "Look we have to hurry. Once he is cocooned it will be too late, his sense of reason is already slipping."

"Again, I am insulted." Bill snapped. "I know not this reason you speak of!"

"Is your sarcasm really needed?" Dipper asked.

"It helps me cope." Bill admitted. Suddenly more 'jelly' shoots out and attaches to Dipper.

"Looks like you're my first meal." Bill joked playfully. Then he ponders, "I wonder what Pine Tree taste like."

"Well keep wondering!" Dipper screamed; he manages to pull himself free which means the cocoon is still in the early stages. Well good, at least they had one thing going for them.

Bill however is still quite stuck.

"Umm… let me help," Mabel offers.

"No! Your little fleshy hands are part of the problem!" Bill retaliated, closing himself back into the locker.

"Isn't there some way we can help?" Dipper asked. "Maybe there's something in your Book of Spells that can stop this."

"Maybe?" Mabel looks fearful.

Dipper shrugged. "Usually it has to run its course, but this isn't the ideal place for that."

"Yeah, Dad says mother was locked in a tower when it happened to her." Bill shouted from the locker.

"And your dad?" Mabel asked.

"Oh, he just went to another dimension and feasted on the locals." Bill cackled.

"Bill! Please tell me he didn't!" Mabel cried.

Bill laughed. "No that was Seth." Bill teased. "My father's wasn't as bad as mother's, so he just stayed in his room for the day."

"So, if it can't be stopped," Mabel began.

"Maybe we can slow it down long enough to get him out of here." Dipper reasoned.

"I'll go home and get it," Mabel said.

"It's not at home! I gave it to Janna!"

"Why?"

"She wanted to conjure a giant floating baby head." Bill revealed.

"You have got to be kidding me!" Dipper ran off to find Janna, while Mabel stood by the locker. She wasn't sure what to do. What if Bill emerged all demonic and ready to chow down? How was she supposed to counter that?

She tries Ford again on her phone; still no answer! She tries Stan, nothing! "Come on Dipper hurry!"

Meanwhile, Dipper burst into Janna's second period class in a hysterical mess.

Big mistake, it was Coach Jackson's Health class, AKA Sexual Education!

"Mr. Pines is there a reason why you just stormed into my class without knocking?" Coach Jackson asked.

Dipper's eyes lock on Janna, and in a panic he just grabs her. "Sorry Coach, family emergency." He screamed.

"Hey!" Janna managed to grab her things just before she is hauled away.

Coach Jackson looks stunned. "I had no idea they were related." He said.

"Dude, what's going on?" Janna asked.

"I need Bill's spell book it's urgent." He yelled at her.

"Oh, why didn't you say so?" Janna asked pulling a piece of paper out of her bag. She handed it to Dipper. "It's my combination."

"What?" Dipper asked dumbly.

"It's in my locker." Janna said as if it was supposed to be obvious.

Usually, Dipper would scold her, saying she should have started with that, but not today. He just snatches up the paper and runs for Janna's locker.

Just then, the bell rang again, and students dispersed out of their second period classes.

"Okay, this isn't too bad." Mabel admitted. "Just hang in there Bill, you'll make it." She assured him. "We got this."

Suddenly, the cheer squad began practicing directly outside the locker, complaining of bats inside the gym.

"Flesh." A voice whispers from within the locker.

"Oh, shoot! Shoot! Shoot!" Mabel yells. "Dipper! Hurry!"

Dipper hears her just as he reaches Janna's locker. He looks at the paper to view the combination. "16…09…" He whispered as he starts to spin the knobs to the correct numbers. "42-" He stops, wait a minute, this was his locker combo! "Janna!" He screams as he dashes back for Bill.

The spell book wasn't in Janna's locker, it was in his! Janna was using his locker again!

"Of all the days you crazy woman!" Dipper screamed at her as he raced by her, texting Ford as he goes.

Janna just shrugs and keeps walking.

(Back with Ford…)

Ford groans as he stretches towards the sky. He had been down underground with in an abandon alien ship all morning. The ship had crash landed there decades before, and the forest of Gravity Falls had grown over it over time. Ford often raided it for parts.

Stan pulls himself out after his brother. To avoid several trips down here Ford had asked, (more like ordered) him to help.

Ford grunt as his phone began to bing with a thousand messages.

Stan's phone echoes his brother's. "What the?" He asked.

Ford places down his heavy load and pulls out his phone. "I got 57 missed calls from Mabel." He said. He wasn't surprised he missed the calls, the alien metal made it impossible to get a signal.

"Me too." Stan said. "I'll call her back."

"Wait, I just got a text from Dipper." He opens the text and sees in block letters.

'Code Argyle!'

Ford's eyes widen. "Stan drop everything, we have to get back to the car now!" He races off.

Stan drops the looted metals and takes off after him. "What's going on?"

"It's the kids, they're in trouble." Ford said as they jumped in the car.

Stan put it in gear and raced off, it was times like this that Ford loved the fact that his brother didn't believe in the 'Rules of the Road'. Still, if it was what he thought it was they'd be cutting it close. 'Just hang in a little longer Dipper.' He thought as he sent a response to the text.

'On our way.'

(Back with Bill...)

He hadn't remembered falling asleep, but the next thing he knew he was waking up in Dipper's locker. It must've been around third period, Bill stiffened as he noticed that he was in some sort of cocoon.

Mabel tensed as Chantelle and Sherry, walked by them, they stop picking up on of Bill's little triangles off the floor. Several had poured out of Dipper's locker by now, through every crack possible.

"Hey, take a look at this!" Chantelle said. "It looks like some sort of triangle."

"Why's it red though?" Sherry asked.

"Oh, we played a prank on Dipper." Mabel faked a giggle and pushed them along. "Nothing to see here girls!"

Meat, Bill could hear the voices of Flesh-bags around him, all he could think about was flesh. And right now, there were probably hundreds of pounds of it in his current location. That would do nicely. He reached out to grab the first; there is a door in his way, but he doesn't care. He can smell a familiar sent, its Pine Tree's…

"Dipper you're back!" Mabel shouts as her brother returns. "Where's the book?"

Bill freezes, the sweet smell of Pine Tree is stronger now, and his stomach growls. A part of him warns him that he would regret eating his best friend, but he paid no mind to that. He just wanted Him!

"It's in my locker with Bill." Dipper was saying. "The good news is I finally got a hold of Uncle Ford, he's on his way."

The cocoon broke open, as Bill continues to reach out towards the locker door.

"Cool I'll just get the book." Mabel says grabbing the locker door handle.

"Mabel no!" Dipper screamed as he noticed the amount of triangles around them.

It's too late!

Bill burst out of the locker, only it's not the Bill they know. His skin is fiery red with scaly skin like a lizard, horns protrude from his head like a crown, and his cheek marks glow as his arms reach for Dipper.

Dipper manages to dodge in time, unfortunately Bill just dives into the class room behind him.

Mabel is so stunned she falls to her knees. "What have I done!?"

Bill jumps back out of the room carrying a student, others come screaming out of the class all around them.

"Flesh..." Bill licks his lips.

"Bill no!" Dipper pulls out a book from his still open locker, and throws it at him.

The book does no damage, but is enough to stun its target.

Bill lets go, and the student screams racing away.

Dipper's eyes lock with Bill's. "Bill!" He moves for him.

Bill screeches before stretching out his massive black wings (What the…) and flies down the hall after the kid.

Dipper and Mabel run after him as a voice rings over the intercom.

"Students a monster is terrorizing the school." It was the voice of the front office secretary. "Run for your lives. I repeat run for you-"

"Give me that!" Mrs. Wong shouted as she took over the announcement. "Students remain calm, this is clearly a prank."

Dipper and Mabel tail Bill as he grabs several students who are all running out of their class room in a panic before sticking them in a goo made prison. It turns into a vicious cycle. Bill finds a victim, captures them, and traps them; rinse and repeat.

"Bill you gotta get a hold of yourself! You're scaring everyone!" Dipper screamed. He makes a jump for him and manages to grab one of his arms. "Stop this, please before someone gets hurt!"

Bill stops, he is suddenly reminded of Pine Tree's alluring sent.

Dipper breathes a sigh of relief, he stopped. Maybe that means a part of Bill was still rational.

The thought evaporates as Bill looks his way, a look of hunger on his face, he screeches, and pounces!

Dipper's eyes go wide as Bill sinks his teeth into his neck!

"Dipper NO!" Mabel screams.

The captured students and teachers scream as they see their fate.

Just then Ford and Stan show up with…a tennis net.

"Drop him Demon!" Ford shouts, distracted by the heat of battle.

Bill looks up from his meal, blood dripping down his face.

Dipper moans, his neck is bleeding profusely from the open wound.

"So, help me Cipher I will kill a kid if I have to!" Stan screamed and he and Ford charge!

Bill screeches before shooting up through the ceiling and up into the sky, taking Dipper with him.

Dipper forces open his eyes, his neck burns, but otherwise he's alive. He is facing Bill; they are face to face. "Hey, buddy! I know you're all flesh crazy and junk, but you think you can put me down!?" He asked hopefully.

Bill looks at him, and suddenly he feels a sense of calm.

"Bill, please come back to me." Dipper mumbles, the blood loss was getting to his head.

Something inside of Bill snaps, he stops flying, and gravity takes over.

Dipper closes his eyes, bracing for impact.

They land in a pile of triangles, unharmed, surprisingly.

Stan, Ford, and Mabel race over to them, they stop as Bill emerges and…

He has returned to normal! Sure, his golden hair is a tangley mess, and his top hat is missing, but other than that everything is the same.

"Where's Dipper?" Mabel screamed; her uncles too stunned to speak.

Bill looks down, and scoops Dipper out of the pile and…he's okay?

Dipper opened his eyes. His left side is covered in blood, but otherwise he is fine. He figures Bill, must have healed him. "That was…"

"Pine Tree, I am so sorry." Bill whispered.

"Oh, I'll show you sorry Mr." Stan began finding his voice.

"Stan now is not the time." Ford said as several students started gathering around them. It would appear they had gotten free from Bill's goo and were not pleased to discover Bill was the monster.

"Dude that was intense." Wendy said.

"Yes, it was the scariest experience I ever had." Candy admitted.

"Not cool man." Oskar said. He himself had been captured in the parking lot at one time.

"What are you?" Pacifica screamed.

"They said he was a demon!" BillCipherfan15 exclaimed.

"Mr. Pines!" Mrs. Wong pushes through the students and staff. "This nonsense will not be tolerated! A prank of this magnitude is going too far!"

Ford steps forward, trying to put a band aid on the situation. "Yes, I agree. Bill's little charade got out of hand-"

"Charade!?" Pacifica yelled. "You'll be lucky if you do not hear from my lawyers."

Several more students begin to shout, but the staff begins to usher them away, somehow finding the strength to shake off their own shock and confusion.

"Mr. Pines, my office!" Mrs. Wong yells. "Cipher you too!"

Bill moves to follow, but Ford raises a hand to stop him.

"Stan and I will smooth things over, you three stay here." He looks to Stan. "Let's go."

Stan looks unsure but follows, soon everyone is out of the hall and back in class.

All but Dipper, Mabel, Bill, Wendy, Candy, Janna, and Grenda.

It's silent among the friends and then...

And then a buzzing sound. Everyone looks to Bill to see that he has very small black wings.

Bill followed their gaze. "Weren't these bigger?" He asked confused.

Dipper nodded, still lost for words.

"So, you can, like, fly anytime now? That would be sick, honestly," Wendy said.

"Nah, these are way too small for that, now." Bill said, looking to Dipper.

"What was that? You'd turned into some sort of red winged beast thing, and you were trapping people all over the place." Janna asked.

Bill goes to answer, but a voice cuts him off.

"It was his true form." A girl with peach skin, long purple hair tied into knee-length pigtails, and green eyes said.

The group of friends watched as she emerged from the shadows.

"He's a demon." The girl said, she was holding a book of demonology in her hands. "That's what the royal family looks like when they go at full power."

Mabel groaned. "Mina, you were supposed to go back to class."

Bill looks confused. "Who is she, and why does she know so much about my family?"

Dipper groaned as well. "She's Mina Loveberry, she showed promise in spell casting, so great uncle Ford took her under his wing and started teaching her with me and Mabel." He explained.

"But Ford kicked her out of our studies and refused to teach her more after she tried to cast a spell that would eliminate all supernatural beings from our world." Mabel cut in. She spots the book in Mina's hand. "And that belongs to my uncle." She goes to take it.

Mina steps back, holding the book close. "Don't you see this is why his kind do not belong here, none of them do."

Dipper stands in front of Bill protectively. "Mina stop, we've told you. Not all supernatural creatures are bad."

"He nearly killed you and you would defend him!?" Mina screamed. "He has tasted human blood! He can no longer be trusted in our dimension!" She looks at Bill. "I cast you out demon! Go back to from which you came!"

"He's not leaving Mina." Dipper yelled. "Now stop."

Mina goes to say more, but sees the Stans are coming back. "Fine, if you won't do what must be done, I will." She glares at Bill. "Your days are numbered Demon!" She than quickly runs off.

"Was that Mina?" Ford asked as he stopped beside them.

"Yeah." Dipper said. "And she knows."

Ford mutters a curse under his breath. "No good will come of this." He pointed out the obvious.

"That bad hu?" Bill asked.

Ford shook his head. "Worse, she is the most skilled spell caster I have ever seen; human or otherwise."

"How'd it go with the principal?" Dipper asked, changing the subject.

"I managed to convince her it was a prank gone wrong." Ford assured them.

"By the way, you're suspended." Stan said to Bill.

"Figures." Bill scoffed. "How long?"

"A week, Dipper and Mabel, I convince her you had nothing to do with this. You called me to stop him and I did."

Usually, Dipper would be obsessed with his clean disciplinary record, but not today. He had more pressing matters.

"Let's get home." Ford told them as the rest of their friends went back to class.

"Call me." Candy whispered to Mabel.

"Great uncle Ford, give us a minute." Dipper said grabbing Bill's arm.

He nodded and the led Mabel and Stan out, leaving Dipper and Bill alone.

For a moment neither of the two speak.

"Pine Tree…" Bill began.

Dipper stopped him. "Don't, it wasn't really you. I know that. Mina, she's crazy, nothing says human blood makes demons go crazy."

Bill sighed in relief. "So, we're cool?"

Dipper nodded. "As we'll ever be." He assured him as he led Bill out of the school. "Just never take a bite out of me again."

"No problem." Bill said. "You tasted awful anyway." He lied.

The two looked at each other and laughed at the strangeness of it all. Neither of them knowing of the darkness that was yet to come.

-To Be Continued