Literally this is what Bill is suppose to look like in this story. Same with Will, if you give him his blue color scheme and sad expression.

Enjoy my little spawns,
-DipperCipher0

+Gravity Falls: Mystery Shack+

"Sapling?"

Dipper looked up at the man from his seat on the couch. "Hey Bill, you might want to turn around." He smiles a bit awkwardly and points behind him.

Bill turns around and sees the humans who had caused him his misfortune. As well as the man who took his son away from him. "Nope! No, no...," Bill takes in a breath, "No." He says shaking his head firmly.

"Wait, Bill-"

"Don't start with me Stanford. Just looking at your old mug makes me wanna to throw you to the hellhounds I have back home!" Tone going from quite mad to very angry in a matter of seconds. His for lighting up to different shades of red while outlined with white. His eyes turning black.

"Bill tone it a bit please. Your a professional for nightmare's sake." Dipper says calmly. "Plus I️ don't think Alma and Cecil would like to toy with him." He expected his father to act professionally, but this is to be expected too. "Maybe I should of called Tad first."

"Oh please, the square would've done something boring." Bill comments as he recedes back to his normal colors. He places his hands on his hips and gets down to business like any normal parent would, but let's not forget Bill is far from normal. "So, how did you find my son?"

"The gnomes informed us while we were walking through the forest before we got to town." Pacifica answers him quickly to keep from angering the dream demon. "They were concerned with someone appearing in the forest out of nowhere with some demonic energy and noting the creatures living there."

"Those little pests are gonna get it." Bill says under his breath to himself.

Dipper could hear it thanks to his heightened senses. "Don't you dare Bill." The blond demon rolls his eyes and crosses his arms over his chest. "I'll tell Mother about how you almost killed me during Weirdmageddon." He had to resort to blackmail just in case his father got any ideas behind his back. So far, no one has informed the blue demon of the events that had transpired between Dipper and Bill during Weirdmageddon.

"Fine, but don't you dare tell him." Bill huffs.

Mabel, who pushed away her confusion of their conversation, steps over a bit and puts Bill back on a defensive stance quickly in front of his son. "Don't even think about getting close to him Shooting Star." His eyes narrows as he looks down to intimidate her.

"Father, let her through."

This seemed to shock everyone in the room. They thought Dipper wouldn't want to see her or any of them besides Bill.

"But Sapling-"

"I want to hear her out, please." Dipper held a small pleading emotion as he and his father locked gazes. Bill sighs and steps aside to let Mabel through.

Dipper snaps his fingers together to create a barrier around Mabel and himself. The barrier was see through so everyone else in the room could see them, but not listen in on their conversation.

"Dipper..." She bit the bottom her lip a bit as she looked at her used to be brother and twin sitting across from her.

"Hello Mabel, it's been 5 years." He watches Mabel nod her head slightly in acknowledgement. Her form was tense, most of all, he could feel the tension just within the barrier. "Don't be tense Mabel. I won't hurt you or lash out."

Mabel let's out a breath she's been holding. She holds her right arm while her eyes meets Dipper's. "First, I want to say I'm really sorry Dipper... for everything." Curious eyes continuing looking at her as he continues to listen. "In the past you've always done so much for me and I've never repaid you for your kind actions. For that I'm ashamed of myself and know how much you've done for me."

"I did those actions because I loved you so much as my sister Mabel. I may not have been the oldest at the time, but I still wanted to protect you in anyway I could while making you happy." Dipper says with a small sad smile gracing his lips. "Nothing back then could make me any happier than seeing you smile."

The brunette wants so much to cry, she really did. Tears were welling in her eyes making her eyes glassy looking. But she wasn't finished with her apology yet. "I also want to apologize for keeping secrets from you. We were twins and close ones at that, knew everything about each other, the good and the bad. Me not telling you earlier you were related to Bill is my biggest fault." Her arms hug her self around her stomach. "I was really surprised, sad even, to know you weren't really my brother... I guess I wanted to pretend longer you were my brother by keeping it from you. I didn't want our relationship to become weird if I told you right after I found out."

Dipper's gaze moves to his lap, "I might be able to understand, I would have probably done the same to be honest." His tone truthful with every word. He wouldn't lie about something like this, family meant a lot to him after all.

Mabel took a step forward and continued until she was fully in front of the demon teen. She bent down to take a seat on the floor, her head now tilted up to look up at Dipper who looked back down at her. "I've missed you Dipper, I really have for the longest time. I still miss you even now, even if you are right in front of me." He tears finally escaped her eyes and ran down her cheeks. "I know I won't see you again after this and it hurts." She buried her face in Dipper's lap.

Dipper kept a calm look and brought a hand to pat Mabel's head while his other hand ran its fingers through her long hair. "Then let me propose something you'll agree too."

Mabel takes her face away from the teen's lap and looks back at Dipper's  visible eye which had turn black with a yellow pupil while holding a mischievous smile. She looked around her just in time to see the barrier change into a black color, erasing their view of Bill, her family, and friends who had surprised expressions when their vision got blocked by the darkened barrier.

"What do you mean Dipper?" Sounding surprised as she looked back at Dipper.

Dipper folded his hands and placed them on his lap. "I say we make ourselves a deal."

"A deal?" She didn't think Dipper would be offering her deal, much less with what they've done in the past with Bill.

"Yes, simple really." He waves his hand and it's covered in his personal flame. "I'll stay in Gravity Falls for the time being, say about 5 months at the most. During that time you can try to regain my trust." He blows the flames on his hand away and they turn into wisps that circle around Mabel playfully. "If you manage to to succeed then I'll listen to whatever request you ask of me and make do with it."

"So if I ask you to stay here in Gravity Falls... would you?" Mabel questions.

"Of course." The wisps around Mabel trial back to Dipper's hand and alight it. He hold his hand out to her. "No strings attached." He assures.

"One more thing."

"Yes?"

Mabel takes a breath. "I want you to live here during your stay." She could see Dipper's eyes widen just a bit looking a bit nervous. "Does it bother?"

Dipper shakes his head. "No, it's fine. I will get use to the feeling of being in this place again, don't worry." He shakes the lingering feeling of shivers he get from being in the Shack. He's never experienced this before with the other Shacks in the alternate dimensions or second universe. Just here, but he'll fix that. "So what do you say Mabel?" Mabel looks between Dipper and his outstretched hand to her, glowing its stunning yellow color.

"Okay."

They hands met, the deal was sealed.

+Outside The Barrier+

Ford and Stan were pounding against the barrier with their fists trying to get to the two inside. None of them have ever seen Dipper like that, his visible just changed quickly with his smile, not that there seemed to be no malicious intent, but they were just surprised. They knew Dipper must have learned from his parents, but it had only been five years, the teen hasn't even used powers since birth and now look where he was. It just flowed smoothly as they have seen by his powers displayed now.

"You're attempt are useless. Sapling's powers aren't weak you know."

They look at Bill with narrows eyes. "Dipper could be hurting Mabel." Stan says with worry.

"Do you not trust my son enough that you think he's hurting her?"

That hit the twins mental arrow. Trust... something they broke with the boy. Pacifica and Gideon pulled the twins back a bit away from Bill.

Just as they were doing that, the barrier collapsed. From the looks of Dipper and Mabel, the both of them weren't in any harm. Bill went to his son to hug him while Mabel walked over to her family and friends.

"Mabel, what happened? The barrier turned black and we couldn't see the both of you anymore." Ford says with concern as he puts a hand on her shoulder.

"I... I talked with Dipper and he offered me-" she stopped herself because she was unsure if she should say it.

"Offered you what Mabel?" Gideon asks.

"I offered her a deal."

Everyone in the room looked at Dipper with more surprise in their expression as he got up from his seat. He tried to avoid his father's gaping look at him.

"Sapling." Bill says lowly in a warming tone. "What did you do?"

"Nothing much Father." Still avoiding his gaze. "Just something she's willing to try. No strings attached at all." He adds to assure the humans don't think wrong of the deal he made with Mabel. "If Mabel doesn't want to share the information of our deal then I will not speak a word."

Mabel seeing Bill's angry expression, worried her for everyone in the room. Although there was still that worry and concern she could see behind the anger of the demon father. "Dipper, I don't mind telling everyone. So it's okay to tell Bill."

Dipper chuckles, "Your choice." He says slightly playful like he knew something they didn't. He looks at his father, "L'p olylqj lq Judylwb d Idoov iru d ihz prqwkv."

"What!?" Bill exclaims loudly, understanding his son, that the Shack shook. The humans had to cover their ears because of Bill's volume. "Zkb gr brx riihu khu wkdw!? Brx nqrz zh grq'w olnh brx frplqj khuh iru uhdvrqv! Rk qljkwpduhv, Zloo'v qrw jrqqd wdnh wkh qhzv zhoo." He grips at his blond hair as he thinks of the horrors at what he just said. Everyone, besides Dipper, couldn't understand what he was saying.

"L'p hyhq vwdblqj khuh gxulqj rxu ghdo." Dipper adds to the horrors of the yellow demon's panic.

Bill hold his head lightly. "L qhhg Zloo..." He says before disappearing somewhere.

Dipper looks back at the group nodding. "Anyways, I need to pick a few things from home. I'll be back soon Mabel." He gives a small wave before finally disappearing through a portal he conjured up in the living room. The portal popped closed when he left leaving them stunned in place.

Mabel shook herself out of her stupor and looked at her family and friends. "Well, I guess I should explain what's going on now."

+Nightmare Realm: With Dipper+

"I'll be fine Mason, it's only for five months."

"Unless you actually start trusting them again that is."

Dipper turned to look at his best friend and self-proclaimed brother with a raised brow through his hologram pad. "I'm giving them a second chance to redeem themselves Mason. I promise I'll leave if something doesn't seem right."

Over the course of the 5 years, Mason and Dipper have gotten really close as best friends to the point where they act like brothers. Mason, being the overprotective kind of brother which Dipper finds considerate and happy with, but at times embarrassing.

"Fine, but I hear something from you or your parents about them deceiving you, I'm going over there myself to beat some sense into them." The brunet crosses his arms and gives a small huff.

"We're 18 already Mason, when am I gonna see you get together with mister blondie in Zero Gravity already." Dipper says teasingly to change the subject away from his deal.

Mason sputters and becomes flustered on the other end of the screen. His cheeks taking on a rosy pink at the mention of the grown up Cipher who lives in Zero Gravity dimension. "W-Who would love that idiot?! There is no way I would get together with him."

"Really now?~" Dipper says using his teasing tone again. His eyes looked like they were shining happily while his mouth appeared like of a cat. "If I remember correctly, your sister Mabel saw you guys kiss during Halloween..." He slyly adds as he finishes packing his backpack. The demon teen remembers when he dropped Mason and his sister off in the Zero Gravity dimension for Halloween. He wasn't able to see it himself, but Mason's sister was a good enough witness for teasing in his place.

Then his human self choked on his words, fumbling to make some form of sentence.

Dipper chuckles and waves him off. "I gotta get going love bird. I'll come visit and take you to Zero Gravity in about a week to see your husband."

"H-He's not my husband!" Mason retorts before Dipper turns of the screen with a teasing smile.

Dipper loves doing that, a reason for him to be the teasing brother to Mason. He picks up the device and puts it in his backpack. The demon then opens a portal to the Mystery Shack.

Before he could even go through, his phone rings. He snaps his fingers to get the phone to appear in his hand. "Hello?" Dipper says as he picks up the call. He walks through the portal to enter a clearing in the forest.

"Sapling? It's me, Will."

"Mother..." Dipper says softly with a smile. He continues walking through the forest path to get to the Mystery Shack. "What this call for?"

"For one, your Father came to me all of a sudden looking faint." Will sighs a bit on the other end. "I heard from him that you decided to make a deal with your former sibling."

"Father was overreacting," Dipper said as he shrugs his shoulders a bit.

"He worries too Dominic." His Mother now sounding serious.

Dipper stops in his tracks. He's never heard Will sound like that before. "I just want to give them a second chance..."

"It's wonderful how your doing that Sapling, but you know how Bill and I feel about them. They took you from us..." Will was getting teary eyed on the other end of the phone. His voice turning from serious to weak in moments. "You are our pride and joy Dominic. J-Just of the thought of losing you to them again- I-I can't-"

"Mother..." Dipper says worriedly in distress at the sound of his mother starting to hyperventilate.

Bill, on Will's side of the phone, comes and comforts his wife with and embrace. "Shh... it's okay Will... it's okay...," he says to comfort his blue haired wife. The yellow demon leads Will to take a seat on the couch next to him. Still embracing the demon in a hug.

Will leans against Bill finding comfort in his embrace. He hold the phone a little tighter in his grip. "Sapling, I️-I just don't know anymore. I'm so scared- so worried about you."

Dipper cradles the phone next to his ear. "I'm coming over there after I drop my stuff off. My deal with Mabel can wait."

"Sapling I'm fine-"

"Mother you're not okay right now. I can hear it loud and clear. I'll be there in a few minutes."

"Dominic-" Dipper cuts the call off and stalks past the forest line and onto the Mystery Shack's property.

He got up right to the door and knocks. Manners first, he can't just barge in. Thankfully, someone opened the door and he pushed past them to the living room.

"Dipper?!" Pacifica calls out to him confuse when he pushed past her to head straight for the living room.

Everyone else had actually stayed in the living room after the event with Dipper and Bill departing their home. Mabel got to finish her explanation before the demon teen got there.

"Dipper!" Mabel says happily as she sees the male come in. But her smiles fades down when she sees Dipper with a very worried look on his face. "What's wrong?"

"I need to visit my Mother's home. He's having a breakdown after what I just did." He sets his rectangular case down on the floor. Waddles, now older, comes in and snorts. The pig goes over to the case and lays on top of it.

"You mean our deal?" She questions.

Dipper nods, "He's worrying and panicking at the moment, I just spoke with him a moment ago on the phone."

"Why?" Ford just had to ask. He was surprised Dipper was even referring to his mother a him. Or was he just hearing it wrong.

Dipper narrowed his eyes at Ford. "Because a certain someone had to come into my life when I was a baby and separate me from my parents." His words biting deeply into the old man as he spat out each word. Dipper keeps his backpack secured on while Ford looks down with a guilty look. "Anyways, I need some time there before I come back here. I just need to spend time with my mother first."

"Dipper?"

"What is it Mabel?" Dipper says as he's making a portal to Reverse Falls.

She fiddles with her fingers behind her back. "Is it possible if I can go with you?" Everyone looked at her in surprise. "I'd like to meet your mother and talk to them about our deal. You know, so they can have trust in us or as least one of us."

She did have a point, Dipper looks at them with calculating eyes. "Fine. But I'd prefer if you had some company. Since I️ might not be able to stay around in one place for too long. I might be somewhat busy in the town where my Mother lives."

Mabel looks at Pacifica and Gideon. "Can Gideon and Pacifica come with us then?"

"If they want to come, but the limit for your company is two. I'm not bring a whole crowd with us."

Mabel looks at her friends with pleading eyes. "Can you guys come with us?"

Gideon smiles, "I'm okay with it, plus we get to see someplace else."

"Pacifica?"

The blond teen as well, "I'll go, it's better than staying around my parents."

Stan trust the two teens with his great niece like Ford. "We'll hold down the fort back here. Make sure you four come home safely."

"We will Grunkle Stan." Mabel giggles as she heads over to the portal with Gideon and Pacifica.

Dipper steps aside and lets them go through first. "Ladies first."

The two females go through the portal hand in hand for precaution. Once they're fully through, Gideon takes his chance to go through with no problems.

Dipper takes a step in front of the portal, but before he goes through he looks over his shoulder to the older twins. "Don't go snooping in my bag while I'm gone. I mean it."

"We won't even touch it." Ford assures. They didn't want to break their chance at getting Dipper to trust them again. They've missed the boy dearly and still linger with regret since that day.

Dipper nods and finally takes through the portal.

"I'm trusting you."

With that the portal closes with a pop.