Well, this is it folks, the final chapters of the three-part Relativity Dipcifica story. I'm so sorry for taking so long to write this. I moved to campus at my new school and was busy settling in and getting used to all my classes. Plus I pretty much started the story from scratch since I wasn't satisfied with what I wrote the first time. I also made a slight change in the previous chapter in which Dipper didn't have a secret project yet. You'll understand why once you read this chapter. Overall though, this was a really fun story to make and I hope you all enjoy this chapter. So without further ado, let's get started.

1980

"Okay, so what if we have a lakeshore theme wedding?" Steven asked. It had been two years since Dipper have proposed to Pacifica and plans for the wedding were finally getting started. With Dipper putting the finishing touches on his book documenting all the weirdness of Gravity Falls, Steven was finally able to start discussing his ideas for the couple wedding. The two were currently in the living room of Pacifica mansion as Steven showed off the wedding binder he made for her and Dipper. Pacifica has already turned down about of dozen of Steven ideas for possible themes for the wedding. Not because they were bad, just a bit overkill. One idea was to hold a supernatural theme wedding deep in the forests with fog machines and getting some of the creatures to make spooky sounds. Pacifica had to explain why that wasn't a good idea since they wanted the guests to feel comfortable, not creeped out. Another idea of his was to hold the wedding on the ancient Sky Arena. While it would be a beautiful place for a wedding, she didn't want to take the risk of someone falling off after having too many drinks. Steven current idea, however, seemed like one she would like. "We can have the wedding at the Gravity Falls Lake, the very place where Dipper proposed to you. We could build a small archway over the docks and have it in which you say your vows to each other there."

"That's actually a fantastic idea Steven!" Pacifica said. "We can have the caterers on the side and while the band performs on stage. Heck, we can even have the wedding at sunset to make it even more special!"

Steven smiled smugly at Pacifica comment due to him having the exact same idea. "I'm way ahead of you on that Pacifica," Steven turned the pages to reveal that he had taken a picture of the sunset. The picture truly captured the natural beauty of the sunset. The sun casts a yellowish orange glow on the lake with it seeming like the sun was slowly sinking into the water. "In fact, I'm thinking that when you two kiss, we can have Opal shoot an arrow up in the sky with it then exploding like fireworks. We'll probably need to practice it a couple of times so that it can be done perfectly on the day of the wedding."

"Well having Opal shoots an arrow in the sky when Dipper and I kiss does sound pretty romantic." Pacifica mused with a smirk as she thought about how many times she and Dipper would have to rehearse their kiss.

"Where is Dipper by the way?" Steven asked. "Shouldn't he be here going over the plans for the wedding too?"

"He went back down to the shack to finish his book yesterday and ended up just staying the night there. Pacifica explained. "Honestly, I'm glad Dipper is finally going to be done with his research of Gravity Falls. Don't get me wrong, I have no problem with Dipper researching the supernatural, his drive and passion are one of the things I love about him. But it will be nice for the two of us to finally spend some more personal time with each other when we go on our around the world honeymoon. Even if a portion of it involves going on crazy adventures and exploring hidden temples. Though I suppose there worst ways to spend a honeymoon."

Steven sighed sadly. "I'm going to miss you guys; Gravity Falls just won't feel the same without you two."

"Well we'll still be here for a while, so you won't have to say goodbye to us just yet." A familiar voice said. Steven and Pacifica turned toward the voice and saw Dipper leaning against the door frame of the living room.

Delighted to see Dipper back, Pacifica practically leaped from the couch as she ran to Dipper and kissed him on the lips. While shocked at first, Dipper immediately kissed back as the couple wrapped their arms around each other waist and continued embracing each other for a couple more seconds before pulling apart. Pacifica gazed at Dipper lovingly while Dipper smirked at her.

"What was that for?" Dipper asked coyly.

"I'm just happy that since my fiancé is done with his work, we will be able to spend a lot more personal time together," Pacifica said flirtatiously. The two would have continued to gaze at each other lovingly if it wasn't for the fact that they were quickly reminded that there Steven was still present in the room.

"Awwww, you two are just the most adorable couple," Steven said as he gushed over the two. Blushing red in embarrassment due to how Steven was smiling at their romantic affection for each other, the two quickly broke apart with Pacifica chuckling shyly.

"Um Steven, do you mind if you give us some privacy?" Dipper asked. "There's something I actually want to talk to Pacifica about in private."

Pacifica went from embarrassed to slight confusion as she looked at Dipper. What did Dipper have to talk to her about in private that he couldn't talk about in front of Steven?

"No problem," Steven said as he got up from the couch. "I actually need to get ready for a mission me and the gems are going on anyway. I can talk to you about the wedding details later, and Pacifica can go over with we have settled on so far."

Dipper nodded his head in understanding as he and Pacifica said their goodbyes to Steven as he left the mansion. Once he left, Dipper grabbed Pacifica hand and led her toward the couch as they both took a seat.

"Dipper, is everything alright?" Pacifica asked. For some reason, Dipper seemed to be extremely nervous for some reason. "Did something bad happen to you while you were in the shack?"

Dipper smiled nervously at Pacifica question. "Actually the opposite, something amazing happened to me at the shack last night?"

"What was it?"

"Okay, so after finally finishing the book, I went to bed only to have the most amazing dream. I know this is going to sound weird, but I was floating in space when variables and formulas started to appear and spin around me. At first, I didn't understand until it took shape into this."

Dipper pulled out a napkin from his pocket and showed Pacifica what he has seen in his dream. With how Dipper talked about it Pacifica thought what he would show her would be amazing. But she was instead confused as the only thing that was on the tissue was an upside down triangle with a hole in it along with a couple of equations and formulas scribbled underneath it.

"Okay, I'm going to need you to explain what I'm looking at exactly," Pacifica said.

"It's the blueprint for a trans-universal poly dimensional meta vortex!" Dipper explained excitedly. "This would solve my hypothesis that there's a dimension of weirdness leaking into our own!"

"Dipper that's great!" Pacifica said as she gave him a hug. She knew Dipper tried finding proof to that hypothesis for months before finally giving up on it since he just kept on running into dead ends. "I'm so glad you were finally able to figure out an answer for your theory!"

Even though Pacifica was congratulating Dipper for finding a solution to his theory, she could feel how stiff his body was. Her confusion only grew more when Dipper awkwardly hugged her back and let out a nervous chuckle.

"I'm glad to hear you say that Pacifica," Dipper said. "Because I was wondering if maybe we could put the wedding on hold so that I could start working on the project."

Pacifica quickly pulled away from the hug and stared at Dipper in befuddlement. Pacifica knew what Dipper said; she just needed to hear it from him again just to make sure she heard him right. "What did you say?"

Dipper squirmed on the couch as he rubbed the back of his head. "I asked if we could put the wedding on hold so I could work on the project." He then quickly closed his eyes and cowered as if he was preparing for her to yell at him. Yet instead, Pacifica just took a deep breath and grabbed his hands before then giving them a reassuring squeeze.

"Sure Dipper," Pacifica said calmly. "We can put the wedding on hold so you can work on your project."

Dipper opened his eyes as he stared at Pacifica in confusion. "Wait, you aren't mad?"

Pacifica chuckled. "Of course I'm mad dummy! I was really excited for us to finally get married. But I also understand how much this project probably means to you since it would answer one of the biggest questions you could never solve before. Plus when your machine succeeds, and it will succeed, it will change the entire world. What kind of a wife would I be if I told you not to pursue this?"

Dipper could only gaze at Pacifica in awe as he was left speechless. It was obvious to her that Dipper expected this conversation to go a whole different direction with her screaming at him. Yet instead of being mad, she has told him that it was fine to push the wadding to a later date so he can work on the machine. Dipper then started to laugh as hugged Pacifica with her returning the hug.

"How the heck did I end up with such a wonderful woman like you in my life," Dipper asked which made Pacifica chuckle over Dipper corny line.

"I ask myself the very same thing about you," Pacifica replied. "You do know that before you get started on your project we are going to spend an entire week together right?"

"Yeah, I figured that,"

"You are also going to be the one who will have to break the news to Steven about the wedding being pushed back."

"Oh come on! Can't you tell him instead? "

"Dipper, you just told me you want to put the wedding on hold, and I stayed calm. Do you really want to push your luck?"

"…No."

"That's what I thought."

…

And so for the next two years, Dipper began to work on the machine. While Dipper had to convince Pacifica, she was able to get toxic waste to fuel the machine thank to her connections. The gems gathered parts for the machine by stepping metal and technology from an old gem ship that crash landed into the town thousands of years ago. Though while getting the material and fuel was easy, figuring out how the machine would work was another thing. Even with the equations and formula that Dipper seemed to get from his dreams, it was still a challenge to actually put them into execution. Even Pearl had a difficult time comprehending the math and science! Luckily, Dipper was able to convince his old college friend Candy Chiu to move down to Gravity Falls in order to help. Things were looking good with the machine with Dipper believing the machine should be fully functional by July.

Yet while things were looking bright for the future of the portal, the same couldn't be said about Dipper and Pacifica relationship.

…

April 1982

Pacifica drummed her fingers anxiously on the table as she stared out the window of the Greasy Diner. It was a dark cloudy night in the small town of Gravity Falls as a light shower of rain fell from the sky and tapped against the window. Pacifica couldn't help but find the irony of how the dreary weather matched her current mood. She and Dipper were supposed to meet at the Greasy Diner thirty minutes ago and he was still a no show. The Dipper she knew was always on time for their dates. Then again, the Dipper she knew these days was vastly different from the one that she met all those years ago. She switched her attention from the window and looked at the engagement ring Dipper gave her four years ago and let out a sigh. When Dipper finally got the courage to propose to her she felt like the happiest woman in the world. After years of dating, they were finally taking the next step in their relationship. Sure, Pacifica knew she would have to wait a while before they got officially married due to his research, but she was willing to wait. Even when Dipper told her to put the wedding on hold so that he could work on the portal, she was still willing to wait because she knew how much this meant to him. Yet the more Dipper worked on the portal, the more obsessed he became with it.

It had only been three months since work on the portal has begun when the first sign of Dipper slowly becoming obsessed with the portal started. The two were supposed to meet up at the movie theater to catch a flick only for Dipper to never show up for their date. In all their years as a couple, Dipper has never been late for a date, let alone misses one altogether. When she went to the shack to see what happened, she found him to be asleep on the couch in the living room with notes and blueprints all around him. She couldn't find it in her to be mad at him since it was clear that he just overworked himself. Plus the very next day Dipper made it up to her by treating her to a picnic. It seemed like nothing in their relationship would change that much despite the fact that Dipper was working on such a huge task. Yet things did start to change, slowly but surely. Two months later after the movie date incident Dipper told her that he would be moving back into the shack.

She was, of course, upset when Dipper told her this. After all, it took over a year to convince him that he should just move in with her and now he just left! Plus it not like he couldn't work on the portal and still live with her. But Dipper explained to her that moving back to shack would allow him to complete the portal even faster so they could get married. While she still wasn't happy about his decision, she did realize what Dipper said was true. After all, despite telling him that she was willing to wait for the portal to be finished before getting married, she really did want to finally tie the knot as quickly as possible. So if that meant that letting Dipper move back to the shack, then she couldn't complain that much.

Yet Dipper obsession with the portal only got worse as the months continued to pass. He would constantly reschedule their dates, stopped showing up for any of the parties she held at the mansion and didn't even go on missions with the gems anymore unless it dealt with gathering more supplies for the machine. Even in those quiet moments when it was just the two of them hanging out his mind was always elsewhere, most likely on the portal. While Pacifica tried to be understanding at first, she slowly got more and more frustrated at Dipper behavior. Still, she did her best to stay patient and not to snap at Dipper even though she was reaching her breaking point. She just kept on telling herself that once Dipper finished the portal, everything would go back to normal. Plus it seemed like Dipper may have realized he has been acting a bit selfish since he actually called her yesterday and invited her for dinner for the first time in months. He told her to meet him for dinner at the Greasy Diner and promised her that he wouldn't be late. Yet here she was sitting alone and contemplating about how much has changed between her and Dipper.

Pacifica heard the door chime open and instantly looked at the door in hope to see if it was Dipper only to see it wasn't the case. But instead of Dipper, she saw a man and a woman entering the diner as they both laughed happily with each other. Seeing such a happy loving couple enjoying each other company just made Pacifica more depressed.

Wait, what am I doing? Pacifica thought to herself as her expression went from pouting to confusion. I'm Pacifica Elise Northwest for goodness sake, one of the richest and most powerful women in the world! I shouldn't be just moping and complaining about how bad things have gotten between me and Dipper. I should be telling him exactly how I feel and how he had been acting like a jerk for these past couples of months! I tried to be patient with him, but the way he has been acting is unacceptable. If we are going to really have a future together I just can't let him keep ignoring me and think that's a perfectly okay thing to do!

Without missing a beat, Pacifica paid for the coffee, grabbed her umbrella, and stepped out of the diner determined to talk some sense into Dipper.

…

As Pacifica pulled up to Dipper house in her car, she couldn't help but look at Dipper house in disappointment. The once charming and quaint house had been poorly taken care of. Shingles were missing from the roof; weeds had sprouted up around the house, and a trash can have toppled over with its contents spilled onto the porch. After parking the car and making sure her brown rain jacket was secured and grabbed her umbrella as she got out of the car and made her way to the door. As she stared at the door, she took a deep breath as she prepared for herself. She wasn't going to yell at Dipper, all she was going to do was talk to him like a level headed adult. She grabbed her spare key for the house from her jacket pocket and unlocked the door before stepping in. Though once she stepped inside the house, she couldn't help but make a face of disgust from the smell. The air lingered with the scent of very bitter coffee. Dipper must have burned some coffee that he made earlier. While the house was mostly dark, the lights in the living room were on with Dipper currently writing some stuff down on the chalkboard. He must have been very deep into it considering the fact that he didn't even look up when Pacifica closed the front door behind him.

"Dipper, did you not hear me come in?" Pacifica asked as she stepped into the living room while noting how chaotic the living room was. Half a dozen books were open on the floor with various papers full of codes and formulas taped to the walls. "Hello, earth to Dipper, can you hear me?" Despite the fact that she called his name again, Dipper was still unresponsive. Was Dipper really that absorbed that he didn't even hear her voice? It wasn't until she laid her hand on Dipper shoulder did she finally get a reaction from him, though not the one she expected.

Dipper let out a startled scream which caused Pacifica to quickly back up in surprise as Dipper fell to the ground. Groaning as he rubbed his head, Dipper looked up at her in confusion.

"Pacifica, what are you doing here?" Dipper asked in confusion as he got to his feet. "And why did you sneak up on me like that? Seriously, give a guy some warning next time."

Pacifica raised an eyebrow at Dipper. "Um, I did give you a warning. I called your name twice but you didn't seem to hear me at all. You were too busy writing on the chalkboard."

"Wait I wasn't wri-"Dipper started to say until he looked at the chalkboard and saw all the writing on it. "Uh, yeah, I was just really in the zone writing. That's why I didn't hear you."

Pacifica continued to look suspiciously at Dipper. Dipper had never been that good at lying to her and it was obvious that he was hiding something from her, she just wasn't sure what. She then noticed the bags under his eyes. "Dipper, when was the last time you actually got a good nap? You look exhausted."

Dipper rolled his eyes at her question. "I'm fine Pacifica, I was just overworking that's all."

Pacifica crossed her arms at how rude Dipper was being. All she did was asking him about his well being and he wants to get an attitude. "Funny, you sure have been doing that a lot lately."

"What's that supposed to mean? Dipper asked defensively.

"Oh come on Dipper don't play dumb with me," Pacifica said. "You have been overworking for months now! All you want to do is stay cooped up in this house and work on the machine! When was the last time you actually did something fun?"

"Pacifica I don't have time for doing fun stuff," Dipper said. "I'm trying to create a gateway to infinite new worlds that will herald a new era in mankind's understanding of the universe!"

"Dipper, when was the last time we actually had a proper date?" Pacifica asked.

"We hung out just last week Pacifica?" Dipper replied.

"No, "Pacifica said. "When was the last time we actually had a date where we actually had fun and talk? Not one where we go over schematics for the portal, or you are distant and uninterested. You never want to do anything fun anymore! All you want to do is stay in the house working on the portal! I thought you were finally realizing how wrong you have been since you called yesterday and invited me to meet you for dinner at the Greasy Dinner an hour ago, but clearly, I was wrong!"

"Wait, what?" Dipper asked. "I never called you about going to the Greasy Diner for dinner tonight. I would have remembered that."

"Oh, are you sure about that?" Pacifica asked. She could feel herself becoming more and more fed up with Dipper nonsense. "Because just a minute ago you didn't even seem to notice that you were writing on the chalkboard. So you can believe why I may have a hard time believing that."

"Pacifica I am trying to do something the world has never seen and you are upset because our dates haven't been up to your standards?" Dipper asked before scoffing at Pacifica comment. "You are just like her, trying to prevent me from achieving my dream! Do you realize how selfish you sound!?"

Pacifica stared at Dipper in shock silence over what he just said. She blinked her eyes at him in disbelief as she processed what he just called her. Dipper of all people just called her selfish. Her expression soon turned from confused to sheer anger. Her hands curled into her fists, her body was shaking with anger, and her face became hot as she could feel it turn crimson red from pure rage.

"Selfish," Pacifica said loudly. "How have I been selfish one in this relationship? Was I selfish when I never once rushed you to finish your book so we could get married? Was I selfish when I agreed I was willing to wait till you were done with the portal so we could get married? No! If anyone has been the selfish one in this relationship it's you! I have tried being patient with you but I am sick of it! All I have done is support you during this entire time you have worked on the portal. Do you not know how big of a risk I took getting my hands on toxic waste to fuel your portal? A lot! I could have been arrested but I still took the risk because I love you and believe in what you are doing! SO YOU ARE THE LAST PERSON ON EARTH TO CALL ME SELFISH MASON!" Pacifica breathed heavily in exhaustion from all the yelling she did as she stared at Dipper in rage while he continued to scowl at him. While she may have had arguments with Dipper before in the past, she has never gotten this explosive in an argument.

Dipper started to open his mouth to say something to her only for him to hiss in pain as he covered his right. "Dang it! Not now!"

Putting her anger at Dipper aside for the moment, Pacifica stepped forward in concern to see what was happening with Dipper. "Dipper, what's wrong with your eye?"

"It's nothing," Dipper said hastily as he tried to back away. However, Dipper wasn't fast enough which allowed Pacifica to pull Dipper hand away from his eye and gasped in shock. A slow trickle of blood was slowly coming out of his eye.

"Dipper, why is your eye bleeding and how long has this been happening?" Pacifica asked. "

In response to her question, Dipper jerked his hand from Pacifica grip and turned his back on her. He continued to avoid making eye contact with Pacifica. "It just a result of overworking, and it comes and goes."

"Bullshit Dipper," Pacifica said. "A person's eye does not start bleeding from staring at equations. It's bad enough you have become obsessed with the machine, are you really going to start lying to me now?"

"You don't need to worry about it, Pacifica!" Dipper snapped back. "It's none of your business!"

"Your well being is my business, especially since we are going to be married!"

"Well maybe we shouldn't get married!"

Pacifica inhaled a sharp breath as the only thing she could do was stare at Dipper in disbelief. "What did you say?"

"You heard me Pacifica," Dipper said in a harsh tone. "If you can't respect my privacy not understand the importance of the portal, then we shouldn't get married."

"Fine," Pacifica growled as she took the engagement ring off of her finger. "Since you don't seem to understand what a relationship is anymore, then you can have this back!" Pacifica threw the ring onto the floor, and without even bothering to see Dipper reaction, she turned his back on him; she stomped toward the door, grabbed her umbrella and slammed the door behind her. As she got into her car and drove back to the mansion, all the anger and sadness that she had been bottling up for months finally came out in a flow of tears. It felt like her heart was just shattered into a million pieces. She knew she couldn't stay in Gravity Falls, not even for another night. Just being in the same state as Dipper was too much for her. She would tell her butler George to arrange a flight for her to leave California as soon as possible. She would tell Steven and the Gems why she left later on. She was in no condition to travel to the temple at the moment. As she kept on driving, she gazed at a picture on the dashboard that featured her and Dipper that was taken during the annual Gravity Falls fall festival. The two were smiling as Dipper rested his arm on her shoulder and Pacifica held a stick of cotton candy. To anyone else, it would look a picture of a couple that loved each other very much. But to her, it was just a painful memory of a happier time.

…

Dipper sat at the bar of a diner as he stared at the engagement ring Pacifica have threw down to the ground when she stormed out. Apart of him wanted to chase after Pacifica and tell her everything that was happening. But he knew he wouldn't have understood. That still didn't make the pain he was feeling in his heart any worse.

"Hey there chum," A voice said behind the bar. Dipper looked up from the ring and saw the one person who truly understood him. "Can I get make a milkshake to wash away your woes?"

Dipper chuckled sadly at his friend line. He always was a jokester. "No thanks Bill, I'm good. Besides, I doubt it would actually help. After all, I am in a dream."

"Yeah, but having a pleasant dream such as drinking your favorite milkshake from your hometown can make a person feel more refreshed." Bill pointed out as he snapped his fingers and a vanilla strawberry swirled milkshake appeared in front of Dipper. "Come on, treat yourself."

Dipper smiled weakly as he took a quick sip of the milkshake only for his eyes to widen in astonishment. Despite the fact he was in a dream, he could taste the sweetness of the milkshake. "Bill, how am I able to taste this?

Bill shrugged his hands. "It's nothing an omnipotent celestial like me can't do. All I did was let your brain recall the exact the taste of the milkshake."

"Bill, you never cease to amaze me," Dipper said in awe.

Bill swatted away his compliment as if he was embarrassed. "Stop it, it was nothing. I'm just trying to help out my favorite human get over his lady troubles."

"Yeah," Dipper said as he gazed at the engagement ring once more. "Lady Troubles."

"Oh cheer up Dippy," Bill said as he put a reassuring hand on his shoulder. "Sure, your special lady left you since she didn't understand the scope of what you are to accomplish, but I'm sure she'll back once you complete the portal."

Dipper looked up hopefully at Bill. "You really think so?"

"Of course!" Bill exclaimed. "When you are done with the portal, it will change the entire world and Pacifica will see you in a whole new light. Besides, would I ever lie to you?"

Dipper just stared at Bill as he thought about his questions. Bill had done so much for him in the past two years. He had taken Dipper under his wings, answered his questions about the universe, and have been supplying him with the information in order to build something that has never been done before. If he couldn't trust Bill, then who could he trust?

"No," Dipper said as he prepared to sip some more of his milkshake. "No, you wouldn't."

And with that, I am done, and man was this fun to make! I knew from the very beginning that I wanted each chapter to focus on a stage of Dipper and Pacifica relationship. So the first chapter was about the meeting, the second one was about them taking their relationship to the next level, and the third was to end their relationship in flames. I decided to deviate a bit from the cannon timeline and have it in which Dipper didn't start building the portal until years later so it could work better with the story. I just want to thank everyone who has followed and read this story. It really means a lot to me to know that people like my writing and give me the confidence to work on my own original story. Though I think from now one I'll probably do one-shots from now on unless I'm certain I can release a multi-chapter story on a scheduled basis. Trust me; I know how it feels to wait weeks, sometimes even months for the next chapter of a story. I have a couple of fun UF story ideas in the pipeline, and may even make an epilogue sequel of this story focusing on Dipper and Pacifica reunion thirty years later. Though I think the next fanfiction I will make will be Loud House related. However, before that, I am FINALLY going to start working on my next YouTube video. In the meantime, however, make sure to leave a review and tell me what you thought of the chapter and the story overall. Also, don't forget to follow me on my Tumblr, Deviantart, and YouTube channel. You can find the link to them on my bio. Until next, this is PC, logging off.