Antimatter Falls

Chapter 1

Disclaimer: I do not own Rick and Morty or Gravity Falls. There may be more appearances from other shows.

Morticia and Mortimer Brick-Pines, born August 31, 1999, five minutes apart. Their middle names are Beth and Sherman, named after their parents respectively. The eldest came out kicking and screaming, delivering a haymaker to the doctor that delivered her. The younger Pines twin near asphyxiated after being strangled by his own umbilical cord. The birth of the twins were witnessed by their father Sherry and their Great Uncle Stanford.

Morticy has a younger brother who's also her twin. Which she finds awesome, she has always wanted younger siblings, always wanted a twin.

Always wanted? Strange you say; she speaks as if there was ever a time where she didn't have a twin. But there was, in the time Before.

You see… Morticy is living a second life. Not a double life, a second one. Reincarnation is the only conclusion.

And it doesn't take her long to realise that she's been born into an alternate dimension. After all she was born in 1999, the past.

She did all that she could to figure this out. Read her mother's textbooks (her mother the college student), reviewed infant development. Making sure her behavior was never too fast or too detrimental. She did anything really to keep herself occupied, from reading psychology texts to napping right along her twin.

And, okay she admits it. Sometimes she acts like a child, and a part of it is that she is a child again. But that's not all. She's taking naps and playing with blocks not just because it's a good way to relearn dexterity - But because she's a kid again! Why not live it up? Life gave her lemons, literally a second chance at life, so. Why not make lemonade? Why not grow up? A second time, right along Mortimer, her twin?

Twin. What a feeling. It was foreign and nostalgic. She might not have had any live siblings in her last life, but her extended family had been tight knit.

But it was the tiny fist in her own- Steady breathing that reassured her, that he was real. That all of this was real. It was too easy to believe that this was simple wish fulfilment. All too easy to deceive herself that this was all just a break in reality. Reading it in books was one thing, but time travel? The multiverse?

But, but- it only took seeing his smile and hearing his all too innocent laugh to ground her… in the here.

All it took was one sappy, sentimental moment for her to become attached. To want to protect this goofy little guy, that she could call her brother. To have this- To have this, someone to be there for.. It was something amazing and unbelievable, and, and- Beautiful.

Morticy rubbed tiny fists over wet eyes, and got over herself. Now wasn't the time to contemplate the beauty of adoption, and her own past thoughts on it. Because right now there was a stranger in the middle of her living room, invading her home. And holding Mortimer.

She didn't care for the possibility of the stranger being a family friend. She didn't care for the logic of her mother being the one to open the door while she was asleep. Right now it was just her brother and she, and a stranger.

She was going to scream bloody murder; everyone in the vicinity was going to know of the Stranger Danger. But before she could, Mortimer teared up, frozen at being held by a complete stranger. His fearful countenance made her brain likewise freeze for the moment, and caused an involuntary intake of breath to take place. Hearing the sound the man turned, his shadow seemed to tower over her, and she blinked.

She blinked, and the stranger's face was suddenly all that she could see. She soon found a calloused hand over her mouth, and rancid breath invading her personal space. The man reeked of alcohol, and old unwashed man. She wanted to scream, but couldn't.

"Shhh!" She wanted to bite the hand, but soon found it impossible. The grip on her shoulder was just enough to be considered uncomfortable if not mildly painful. "I'm not a bad guy," eyes out of focus, he was the very picture of instability.

"You see, I've been busy lately and only recently do I have the time to visit my grand… nephew."

"Now.. I'm going to let you go.." The stranger tried to placate the toddler, but the wide smile came off as unhinged. "So don't cry, okay?" The hand on her shoulder felt more like a threat than a sign of reassurance. In that moment Morticy thought of her father who wouldn't be home until late at night. And she thought of her mother studying right upstairs and unsuspecting. The situation left the realm of stranger danger from a possible family acquaintance, and into the domain of a home invasion. Because she knew her mother couldn't have answered the door, and let this man into their home. Her mother definitely wouldn't have left this unstable man alone with her two very young children. The strange man must have somehow broken in, with the intent to harm.

It was with those thoughts in mind that she went along with the man, and nodded her head. As soon as the strange man let her go completely, Morticy screamed.

"HeeELP-Mmmph-" Morticy found her face grabbed, thumb and index finger pinching into skin. "Now.. What was that for? Didn't I just ask you nicely not to cry out?"

With his other hand, he started pointing at her. "I'll have you know that I have a killer headache." Morticy's eyes widened.

"Wait a minute.." The paranoid crackpot's searching gaze sent shivers of unease throughout her entire being. "Can you- Can you- You understand what I'm saying? Everything? Do you understand the situation you're in?" He smacked his own head. "Of course you do! You were trying to call for help earlier weren't you? Exceedingly smart for a kid your age, aren't you now.." He proceeded to chuckle, genuinely amused for some reason.

"I'm going to let you go and this time you're going to use your inside voice. Right? No don't nod your head this time. If you understand.. Wink for me." Dumbfounded Morticy's mind blanked on her.

"Did I say to blink rapidly? Wink, baby, wink for me!"

"Haha... A winking baby. Now.. Who are you? The neighbor's kid? Play date?" Morticy frowned, she didn't care for her full name.

"I'm M-m-m-morticy," the man's eyes grew as he realised something. "You're his twin!?" She nodded. "Twins, huh?" He seemed to be contemplating something, but Morticy ignored that. "You should leave. You're making Mortimer's stranger anxiety act up again."

"..Stranger anxiety? How do you even know what that is?" The faux child prodigy pointed out a college level book she had read it from. "..Talking and reading baby.. Okay, I'll leave.. For now. But I want you to promise me a few things. Since you can read already I want you to figure out what your last name is. Rifle through the mail or something…"

"I already know my last name though. It's Brick-Pines."

"Pines… Fuck! Wait. Brick!? Not Sanchez? And it's hyphenated too.. Oh for the love of- Okay, fine. Just, can you just keep this impromptu visit a secret from your mother? We're not- Actually I don't know where we stand with each other. We're family.. But it's complicated. And I don't want to make my come back official until I feel like it. Promise me and you can ask me anything."

"Why should I?" She hated how petulant her voice sounded in that moment.

"Well.. I could just kidnap you and your brother and nobody would ever know who did it! Or you could just give me your word." Oh, she'll do it. She'll make that promise and then break it! Her mother needed to know how dangerous this man was. And she very much doubted that he was even telling the truth. But she couldn't let on what she was planning.. So it was time to play the ace up her sleeve.

"Pinky swear?" She made it so, her proposition sounded like it was made from genuine effort. Effort made from sweet, childhood innocence and naivety.

"You're smart enough to read books on psychology and you want to depend on a pinky swear? Guess you're still a kid after all.." Morticy pouted deliberately. "Okay, okay. I pinky swear." A pinky was held up, near her own up raised digit.

"Wait." Morticy motioned with her other hand. "Your other hand. Keep it where I can see it." She smiled as if she really were a child who thought it all a game.

"Ha! You're a paranoid little shit! I like that. Here." Pinky hooked and right hand raised, scouts' honor and all that. "Pinky swear." Not that he had ever been in the scouts but whatever floated this kid's boat.

"No-uuguh-w ask me anything. I'll prove to you that I am indeed who I say I am."

"How do you know Mortimer's name but not mine if you know us? All of our other relatives have already come to see us before, including our great uncle. The real question is who are you really, to us."

"Pa-uurrrp-ss!" Our "Great Uncle" went all cross-eyed, he seemed to find this entire situation entirely too funny. "Aha-ha! I'm just yanking on your chain. But I really am your Great Uncle, just from the other side."

"And now I'm going to leave, for realz. But I'm not disappearing or anything. It's not your inability for object permanence acting up.. You see this here contraption? It's a portal gun! It makes portals! And that's how I'll take my leave. Through science! Not magic, and if you say otherwise.. I'll kill you dead, son! Ahahah!"

Just like that he was gone, except. Except portal gun. And then the blue headed man - blue hair, how did she miss that earlier? - popped his head back through the green tear in space.

"And I-I totally knew that you guys were twins. To-ouugh-tally! And you know how? Because I'm a twin too! I'm your mother's father's twin brother, Rick Sanchez! Sanchez oouuut!"

Rick Sanchez.. and Morty.. #%!

But, but how?

Their mother's name was indeed Beth, but the family name. It wasn't Smith. How. How was this possible?

Being born into an alternate dimension is one thing. But being reborn into an alternate universe where a television show is the reality? Where she's one of the main characters? No. Where she replaced one of the main characters. Summer.. She doesn't exist here.

And maybe.. Maybe that was proof? Proof that this was real, that this wasn't some.. Something that doesn't even make sense.

It couldn't be. Their father Sherry-! Their father's name is Sherman for Pete's sake!

Their last name was hyphenated even, as Brick-Pines-

Mortimer and Morticy, the both of them were real. Not a figment of the imagination, not a piece in western animation. The four of them were a family, the two of them were the Brick-Pines twins-

Oh- Oh.

No.

They were the Pines Twins, the mystery twins. But Mortimer, he had a birthmark on his forehead, but it wasn't a constellation. Heck! His name wasn't Mason and I'm not Mabel.. They couldn't- There was no way that they were characters in something that sounded like a poorly made fan fiction. They couldn't be in some absurd crossover of Gravity Falls and Rick and Morty!

… Could they?

AN: And I've created another shameless SI reincarnation fic. Gravity falls and Rick and Morty crossover, woot!