A different kind of monster

This is a cute tickle fluff fic based on this ask I saw on tumbler. Enjoy ^.^

Ever sense Ford had finally gotten out of the portal, both Dipper and Mabel were dying to get to spend some time with their long lost Grunkle. It took a while for even Dipper to get close to him, but eventually he was spending a little family time with them upstairs. Soon it became a bit normal, and he opened up more to both the kids, and his brother.
"Hey Grunkle Ford," Dipper asked while laying on the yellow carpet. "You haven't really tolled us that much about the monsters in Gravity Falls that we haven't seen."
"Yeah," Mabel said, hanging upside down on the couch. "What chu hiding from us Grunkle Ford?"
Ford chuckled to himself as he looked up from the book he was reading.
"Now kids," Stan butted in while sitting on his chair. "The main reason that no one has tolled you about the things deep in the woods is because they would scar you for life, and I don't want to be getting calls from your parents saying you came back with nightmares."
"But Grunkle Stan," Mabel wined. "We were scared for life within the first week of coming here."
The two Grunkles couldn't help but laugh. They really couldn't argue with that.
"Alright, alright." Ford said, still laughing. "I suppose I could tell you a little story about a monster."
Dipper and Mabel couldn't hold in there excitement as they ran to sit down in front of their Grunkle.
It wasn't long before they were chanting, "story time, story time," as they waited for Ford to put down his book.
"Ha, okay now, let's settle down a little." He started to glance over at his brother as he got an idea.
"This is a story about a special monster," he said, still glancing at Stan.  "A story about the most ruthless monster I've ever meet!" As he said it, he wiggled his fingers and gave his brother a wink. Stan caught on to what he had planed, and with a mischievous smile, slowly got up and went behind his great niece and nephew.
"This monster," Ford went on, "lives in the very deepest part of the woods."
Both Dipper and Mabel were leaning forward, listening with anticipation.  
"This monster has only one purpose in life, to torture people!" He empathized this with a quick jolt, making the two children jump in their sets.
"He takes you when you least expect it, normally in the dead of night. Anyone who's taken by him never talks about what happened, but some say that he tortures you to the point of tears, and has you begging for mercy."
The kids were fully invested in the story now, oblivious to their other Grunkle, who was directly behind them.
"But this monster doesn't know the meaning of mercy. He tortures his victims all through the night. They say that once he has you in his grip, he won't let go until he feels like it. And by the end of it, he leaves you in stitches! Still able to sense him around you, unable to forget the memory of his torture!"
"Whoa," Dipper said astonished, "what do you call this monster?"
That was Fords signal to wrap it up.
"He has been given many different names, but the name that I call him in my journals, is..."
He gave a wink at his brother, and suddenly, the children were being pined down by their Grunkle, shouting in surprise.
"The tickle monster!" He finally concluded. Immediately, he reached for Dipper and Mabel, tickling their sides and under arms.
"Nohohohoh, Grunkle Ford!" Mabel laughed as she squirmed a bit. She was doing okay, but Dipper wasn't keeping his composure very well, as one of his worst spots was attacked.
"AHAHAHAH! w-w-whait! GRUHUHNKLE FOHOHRD! STOP!" He was hysterically laughing, hardly able to speak.
"Hey Ford!" Stan called. "Your not doing it right. Mabel's like me, ticklish in fewer places. Her knees are the worst, next to her legs. Here, watch."      He suddenly focused all his attention on Mabel, getting her knees. Now this got Mabel laughing some more.
"Ahahahahahahah! GRUNKLE STAHAHAN! You trahahaitor!" She shouted as she felt the fingers spidering on her knees and legs.
"Hugh, I guess you were right." Ford laughed, now being able to focus on his nephew.
Dipper was laughing uncontrollably at this point, barely able to form a word.
"NOHOHOHOH FAIR! YOHOHU HAVE S-SIX FINGERS!"
"Well," Ford said as he continued to tickle him, "that's one good thing about having a genetic mutation."
"Hey, point dexter!" Stan shouted. "The kid can't stand raspberries."
"Oh!" Ford said with mock surprise. "That's some good information." He momentarily stopped the tickle attack to let Dipper breath a little. One Dipper could form a sentence again, he tried to protest. "Grunkle Ford! N-no! Wait!"
Too late. Ford suddenly gave a big raspberry on Dippers belly, sending him into a laughing frenzy.
"AHAHAHAHAAHAHAHAHA!" He giggled helplessly at the vibrating, tickley sensation. "I CAN'T! AAHAHAHBREAHATH!"
"Alright," said Grunkle Stan, finally letting up on Mabel. "We don't want to kill them!"
Ford gave one last small raspberry and let Dipper go. The two were still giggling breathlessly as they tried to regain their composure, still able to feel the tickley sensations the tickle monsters left behind.
"Looks like we still got it." Ford said triumphantly.
"I can't even remember the last time we've done this together." Stan chuckled.
When the two victims were finally able to speak again, Dipper whispered to Mabel, "Hey, did you here what Grunkle Stan said earlier."
"Yeah, but I'm surprised that you were able to focus on anything," Mabel teased. "You ticklish brother you."
"That's not my point!" He whisper shouted back. "The point is that Stan is ticklish, like you. And that means, Ford is probably ticklish, like me."
Mabel smiled, as she caught on to Dippers plan for revenge.
"So." Dipper spoke up as they simultaneously turned to their Grunkles, still sitting down on the carpet. "Guess you had fun with us there."
"Now," Mabel said fiercely, "Its our turn."
"Uh oh." The older pair said in sync.
Too late to run now, Dipper and Mabel charged their attack. Mabel got to Stan's knees, and Dipper went for Fords under arms.
Now things weren't too different when the tables where turned. The older brothers were both laughing like their niece and nephew, with Ford seeming to be the more ticklish of the two.
"AHAH, D-DIPPER!" He couldn't say much after that, because Dipper switched over to his sides, leaving him in stitches.
"AHAH! T-that's it!" Stan shouted. "If I'm going down, ahaha- you're gohohoing down w-with mehehe bro! H-he's most ticklish on his feet!"
"WHAT!" Ford shouted. "You TRAITOR!"
Before he knew it, his nephew has gotten to his already bare feet, and was spidering his fingers across the soles.
"AHAHAHAHAHA!" Fords laughter was hysterical now, having his worst spot attacked by wiggling fingers. Dipper might only had five fingers, but that didn't make the sensation any less worse.
"THIS IS WHAHAHY I NORMAHAHALY WHERE SHOHOHOES IN THE HOUSE! AhahahaAHAH!" Ford had lost any sense of dignity he had the moment that he snorted. He covered his mouth as everyone stopped what they were doing to stare at him, stunned with shock.
After a few moments of awkward silence, Dipper finally lost it. He grabbed his sides and rolled to the ground laughing, not as hard as when he was being tickled, but still pretty hard. Soon he was snorting too. This finally made everyone snap, with Mabel being the first.
"BRO!" She shouted. "I can't even right now! What did I just witness?" She was laughing on the ground, right next to her brother. Soon, the older pair of twins joined them.
"I-I guess pig noises just run in the family!" Stan laughed as he elbowed his brother.
"H-hey!" Ford said, still giggling. "You be quiet! I think it sounded more like you snoring at night!"
This sent out another wave of laughter.
"G-Grunkle Ford!" Dipper said, whipping a tear from his eye. "I finally know the side of the family I get my embarrassing noises from. I've NEVER heard you make that sound!"
"I'm hearing some of this for the first time in a long time to tell you the truth." Ford laughed. "I don't think I've laughed that hard in DECADES! In every dimension I've been in!"
The laughing continued until everyone was tiered out, laying on the floor.
"Really, I've missed stuff like this." Ford suddenly said.
Stan looked over to his brother, seeing the expression on his face. "What?" He responded. "Embarrassing yourself in front of family?"
"Not exactly," Ford chuckled. "But I even missed that sometimes."
The room was quiet for a while, until Ford composed his thoughts.
"I never even thought I would ever be able to even smile again, much less laugh with my family."
Dipper and Mabel couldn't help but scoot in closer to comfort Ford.
"Hey bro," Stan said as he moved closer to his brother. "You can come out of the basement any time and join in on our tickle fights."
"Yeah!" Mabel said enthusiastically. "I could always use some help ticking Dipper." As she said this she gave Dipper a poke on his belly, making him squeal and move over a little. Everyone laughed at the new noise.
"Maybe not only me please." Dipper said nervously.
Ford couldn't help the smile on his face as he looked around at his family. Maybe he really could have a little bit more of a normal life, with a wonderful family who he could really open up to.
"Okay," he said. "I'll come up more often when I can."
Everyone gave a little cheer as the four formed a group hug. Ford was ready to have a little more laughter back in his life.
They all had much more tickle fights after that, and everyone in Gravity Falls knew not to get in a tickle fight with the Pines tickle monsters.