+Bill's Castle: Gravity Falls room- Next Day+

Secretly, while the nine main people were exploring the castle again, the rest of the citizens were setting up a party for one of the Twins' birthday. Since Dipper was being held who knows where by the triangle demon.

They managed to convince the of the harpies to help them. They worked well on decorating the room to Mabel's liking with the help of Mabel's friends, Grenda and Candy.

After an hour or so one of the harpies sensed the nine humans coming back and darkened the room. When the door opened, everyone sprang out and cheered a Happy Birthday to Mabel.

"HAPPY BIRTHDAY MABEL!" They exclaimed with happy tones.

Mabel looked at everyone in surprised and her two best friends gave her a hug. Surprisingly she cried falling to her knees hugging them both.

"Guys, you didn't have to do this..." She cried sadly. "Plus Dipper isn't here to celebrate it with me..."

Everyone gave her a solemn look, but Stan and Ford went up to put a hand on Mabel's shoulders.

Stan smiled sadly at her. "Come on sweetie. Dipper would have at least wanted you to be happy with this."

Ford nodded in agreement with his twin. "He did do all of this to save you and everyone from the weirdness Bill has caused."

Mabel sniffed and wiped her tears away with the sleeve of her sweater. "But it won't be the same with out bro bro... I just want him back here with all of us..."

Her friends got her back on her feet and continued to get her to cheer up. Even Pacifica and Wendy tried to help her to which help Mabel a lot.

The party started, everyone chatted, danced, and tried their best to have fun. Gideon had been more kinder to Mabel and respected her wishes which had been a plus on Mabel good book.

The party only lightened up the mood a little.

+Bill's Castle: Bill's Chamber+

Dipper sat on Bill's king sized bed sketching and writing in a blue journal that Bill had given him. The journal was kinda like Ford's six finger one, but it was blue and silver with a Pine Tree on the cover.

Bill, himself was holding the kid against his chest, looking over the kid's shoulder watching him write across the paper. He had a lazy smile on his face while running his fingers through Dipper's hair as he hummed a calming tune.

"Hey PineTree?"

"What Bill?"

"I feel like it's suppose to be an important day today, but I can't put my finger on it." Bill says trying to remember the occasion.

Dipper hummed curiously. "Does it have to do with the others?"

"Probably... I should go check up on them and see what they're up to! I'll be back soon Pine Tree!" Bill exclaimed teleporting himself out of the room.

Dipper rolled his eyes and continued his focus on his journal. "It's my Birthday you dumb dorito..." He says softly to himself.

+Bill's Castle: Gravity Falls room+

Everyone seated themselves at the table and ate the food provided by the harpies. It was too bad that they couldn't get any cake, it would've made everyone happy.

Mabel stood up and smiled her best at everyone. "Everyone, I just want to say that I'm very greatful that you all set this up for me. Of course this would have been all the more amazing if... If Dipper was here with me..." Her sad tone coming back again.

Her friends and family gave her sad looks while everyone gave her a pitied one.

Echoey laughter filled the air which cased everyone to stand up and get into a protective stance. Bill popped into existence in the room and grinned at them happily.

"So it Shooting Star's birthday today huh? So that means it's PineTree's as well!" Bill's grin widened more if that was even possible. He made his cane appear in his hand and floated down to the ground. The demon walked over to Mabel who took a step back fearing what Bill might do to her.

Ford and Stan stood protectively in front of her setting a distance between the two.

"Relax yourselves Pines, not gonna hurt you guys. It's practically under contract with Dipper and I." Bill says with a smirk.

No one relaxed, no one could trust a demon. Especially a demon like Bill.

"So Shooting Star~ What would you like for your Birthday?" Bill asked gleefully at the now young teenage girl.

Mabel froze, Bill was asking her what she wanted for her Birthday? Then she got an idea, she could ask to see her twin brother again!

"C-Can you let us see Dipper?! Please!" Mabel exclaimed rushing past her Grunckles up to Bill. "Please Bill! I'm sure we all want to see my brother again! Please let us see him!" Mabel basically begged the demon.

Bill chuckled at her plea, but nodded anyway. "Sure thing Shooting Star!" With a snap of his fingers everyone was teleported to Bill's chamber.

They saw Dipper on the big King sized yellow bed, scribbling away in a blue journal. He looked healthy and well, no signs of injuries or bruises on his body.

"Hey PineTree~ I'm back!" Bill cheerfully exclaimed getting the brunet's attention.

Dipper looked up and smiled a little. "How am I not surprised?" He said in a deadpanned voice.

"Aw~ You wound me PineTree!" Bill faked hurt with a fake tear in his visible eye.

Dipper closed his journal and got off the bed and walked towards Bill. Mabel so happy to see her brother ran up to hug him, but she just phased right through Dipper.

"Huh?" Mabel sounded confused.

Dipper kept walking until he reached Bill. "How's everyone? I'm assuming their still alive and safe."

"Of course Pine Tree! I'd never go back on our deal, it's too precious to break~" The demon replied cheerfully bringing Dipper into a hug. He smiled softly and patted the brunet's head a few times. Mentally smirking at the shocked faces of the Pines Family and the residents of citizens.

"Dipper! Dude! We're here! Can't you see us?!" Soos exclaimed, but Dipper didn't responded to them.

"Did the kid become deaf to us or something?!" Stan says loudly.

Dipper handed his journal to Bill. "Can you check his to make sure if the information is correct? I wasn't too sure about some parts."

"Kid wake up! This is not cool man!" Robbie tried to get Dipper attention too, but it didn't work.

Dipper is now officially thought to be deaf to them. He wasn't responding in anyway to their questions, not to mention their presence.

Bill nodded. "Get some sleep PineTree. I'll be here when you wake up and I'll have a surprise waiting for you too."

"Hmm... Okay." Dipper yawned already feeling drowsy. His eyes slowly closed shut when Bill picked him up to carry him to the bed. The blond laid him down and placed the covers over him.

"Cipher you bastard! Why couldn't the my nephew see or hear us?!" Ford asked angry while Stan hugged a crying Mabel.

"Ah~ Shooting Star only asked to see Pine Tree though, not to talk and let him see you guys." Bill explained his action with a chuckle. He snapped his fingers and everyone was back in their cage room. The demon went up to Mabel again and put his hand in his pocket to pull out a little pink box. "Here's your last present from me Shooting Star! Hope you like it!" He took Mabel's hand and placed the small box in her palm. Bill teleported to who knows where while popping a big cake on the birthday table.

Mabel sniffed, wiped the tears away and stared at the little box. She shook it a little then opened it, her eyes widened at what was inside. Innocently laying inside the pink box is a silver thin chain necklace with a Shooting Star charm hanging on it. Hanging next to it was a tiny corked bottle that held a mix of yellow and blue dust in it.

"Dipper..."

Everyone looked at her sadly.

Definitely not a Happy Birthday.

+Bill's Castle: Bill Chamber+

After awhile everyone had decided to rest for a bit. Even the demons who loved to party so much.

Bill sat in his room reading Dipper's journal carefully and correcting his mistake with his powers. He didn't have to use it a lot because Dipper hardly made any mistakes when he wrote down the information of the different creatures.

'The kid's been really careful doing all of this. I'm impressed!' The demon thought happily. He admired the boy's drawings too, very detailed.

His thoughts were inturupted when he heard Dipper waking up from his sleep. The turned his chair to see the boy sit up and grinned at him. "Hey Pine Tree!"

Dipper looked at Bill smiling back at him kindly. "Hi Bill."

Bill got up from his chair and walked over to Dipper. He sat down on the bed next to him and showed him a tiny blue box wrapped with a yellow ribbon. "Happy Birthday Pine Tree!" The blond smiled and place the box in Dipper's hand.

Dipper looked down at the box and slowly pulled the untied the yellow ribbon. He opened the box slowly and carefully, inside the box was a black thin chain necklace with a Pine Tree and Triangle charm. Dipper chuckled. "Thanks Bill, I love it."

"Here, let me put it on you." Bill says and Dipper gives the box back to him. The demon took the necklace out of the box, unlatching the chain. He placed it around Dipper's neck carefully and latched the chain back together. "There~ It looks beautiful on you." Bill says admiring the sight before him.

Dipper lightly blushed at the comment and touched the charms with his finger tips. He smiled softly and gave Bill a sudden hug.

Bill was surprised by the action, by hugged him back no less. "My last present is what you want from me, no deal needed. Anything you want..." He says patting Dipper's back.

Dipper thought about it and nodded. "Can you let me see everyone again? I wish to speak with them and let them talk to me too. It's been a little lonely lately since you seem to be busy with your ruling." Dipper says in a sad tone.

Bill didn't really like the wish, but it was his Pine Tree's birthday wish, how could he say no to him. Plus he kinda felt guilty for leaving his Pine Tree alone most of the time. "I'll let you meet with them for three days, that's it. After that you stay in my chambers again, alright?"

Dipper responded happily kissing Bill on the cheek. "Thanks so much Bill! *yawns* I'm really happy."

Bill chuckled and got in the bed with Dipper and laid down next to him closely. He caressed the brunet's face gently as the now young teen fell asleep again. He placed an his arm around Dipper's waist and laid his head down on the soft pillow.

"Happy Birthday Pine Tree, congratulations on becoming a teen. Sweet dreams~"

Bill snapped his fingers so the lights in the room turned off.

Darkness lulling the demon to a short sleeping state with a smile.