Gravity Falls X Reader

The Last Mabelcorn

"Your bad deeds make me cry." Her eyes well up, and a tear lands on a flower, killing it. "NOOO!" Mabel shouted. "Come back when you're PURE OF HEART. NEEEIIGGGHH! Exit is that way. Shoes, shoes, take your shoes. This isn't some... some... shoe store." The humans leave and the gate closes. "Man, what a jerk. Which is pretty disappointing. I thought unicorns were supposed to be nice." (Y/n) frowned. "Hey, Mabel, don't let her get to you." Grenda said. "Yeah, I wouldn't trust a horse that wears makeup." Wendy said, and (Y/n) snickered. "No, girls, she's right. I used to be one of the sweetest people I knew, but recently I've been slacking in the whole goodness department. Well, today we're gonna fix it. From this moment forth I'm gonna do so many good deeds, I'll have the purest heart in Gravity Falls!" Mabel pumps her fist in the air and accidentally punches a bird out of the air which opens Wendy's, Candy's, and Grenda's mouth as a form of minor shock. "That... that bird is fine." She said. Later, (Y/n) Candy, Grenda, Mabel and Wendy are on the sidewalk. "Alright, Mabel, it's time to strengthen your heart." Mabel said to herself. Mabel picks snails off the sidewalk and puts them on large grass. 

Mabel digs a hole and (Y/n) puts a tree in it. Toby Determined tries to come outside but the tree has blocked his door. Mabel puts a giant smiley face sticker on Stan's face. He screams and breaks his lamp in the process. Mabel donates three pints of blood, then faints. Mabel stops traffic for some ducks to cross, paints glitter on the statue of Nathaniel Northwest, fills Lazy Susan's tip jar, and she, (Y/n) Candy, Grenda, and Wendy help a woman with her groceries. Mabel looks at a checklist of good deeds. "Boom! A thousand good deeds. When that unicorn scans my heart, she's gonna say I'm absolutely, one hundred percent, bona fide-" she said. "Not pure of heart." Celestabellebethabelle said. "Booyah! Wait, what?" Mabel asked. "How is that even possible? Mabel's a straight up saint, you judgmental hoofbag!" (Y/n) snapped. "Please, tell me what I'm doing wrong!" Mabel begged. "Doing good deeds to make yourself look better isn't good at all. Not to mention you're crushing, like, ten dandelions right now. Those are basically children's dreams." The unicorn said. Mabel gets off the dandelions and gasps. "I'm sorry, Mabel. It's not my fault you're a bad person." Celestabellebethabelle said. 

(Y/n), Candy, Grenda and Wendy gasp. Mabel runs off crying. "Mabel, wait!" (Y/n) shouted. "Come back!" Wendy shouted. "Now if you'll excuse me, I have a 3 o'clock posing in front of a rainbow." She poses in front of a rainbow. "NeigheighEIGHEIGHeigheigh." Later, Mabel is lying down outside. (Y/n), Candy, Grenda and Wendy walk up to her. "Come on, sis. Don't beat yourself up over this." (Y/n) said. "Let's forget about getting that dumb unicorn hair." Candy said. "It's not about the hair anymore, guys. It's about me. Being kind and sweet is what makes me who I am. If I'm not a good person, who am I? I'm not leaving this spot until I think of a deed that makes me as good as Celestabellebethabelle." Mabel said. "But, Mabel..." Candy said. "Just leave me be." Mabel said. "Pst." (Y/n) ushers Wendy, Candy and Grenda away. "Guys, if you ask me, this whole thing is a serious load. Mabel's like the best person I know. We tried getting that hair the good way. Now it's time we try... the (Y/n) way." (Y/n) punches and rubs her left fist against her right hand as a way of signaling a violent gesture. "I like your attitude, (Y/n)." Wendy smirked. "Are you suggesting violence? Sabotage?" Grenda asked. "Mabel's not going to like that." Candy said. "Mabel doesn't need to know. Look, it's time we stop trying to be so "perfect" and be who we really are. We're crazed, angry, sweaty animals! We're not unicorns, we're WOMEN! AND WE TAKE WHAT WE WANT!" Wendy punches a tree which brings a couple of leaves down to the ground. "Yeah! Yeah! Yeah! Yeah! Yeah!" (Y/n), Candy and Grenda shouted. Grenda smashes a rock on her head. "Too much?" She asked. "Here's what we're gonna do." (Y/n) said.

Time Skip

"Get me a flaggon of your daintiest honeysuckle, please." A gnome said. "I'm gonna need to see some ID." The bartender said. Wendy kicks the door open. "It's the cops! Hit the deck!" Another Gnome flings himself out the window. "I'm lookin' for someone who knows how to take down a unicorn! No tricks or games!" (Y/n) demanded. Candy smashes a bottle. "We are human! We take what we want!" She shouted. "Yeah!" Grenda said. "Fairy dust. A whole magic bag's enough to put a unicorn out cold. But if I do you a favor, you gotta do somethin' for me." Another gnome said. "Just, spill it, half-pint!" Grenda slams her fist against a tree stump. "Butterfly trafficking is illegal in this part of the forest, but I like butterflies. They tickle my face and make me laugh. Bring me a bag of butterflies and we got a deal." He said. (Y/n), Grenda and Wendy nod.

Time Skip

Grenda approaches the gnome and gives him the bag of butterflies. "Two bags of fairy dust, just like we agreed." The gnome said. "Where do you get this stuff?" Grenda asked. "Everyone likes sausage, but no one likes to know how it's made." The gnome said. "You disgust me." Grenda said. "You've got your poison; I've got mine; we made a deal." The gnome said. "Yeah, well, the deal is OFF!" Grenda shouted. Several policemen gnomes run out of the bushes. "Freeze! You're under arrest! Get down! Get down!" One of them said. "These butterflies aren't mine! I swear! I've been framed!" The gnome shouted. "Tell it to the adorable owl we've dressed as a judge. My cut." Grenda gives him one of the bags. Meanwhile Mabel is writing in her notepad. "Good deeds. Good deeds. Aww that's not good enough! Come on, Mabel, you can do better than that!" She said. (Y/n), Candy, Grenda and Wendy enter Celestabellebethabelle's house. "Oh sure, sure, I wish I could travel, but it's just not feasible in this economy-" she gets hit with the fairy dust. 'What the hay?!" Then faints. Faun nervously plays S.O.S in morse code on pipes. Grenda puts a towel over its mouth. "Sleep now! Sleeeeep." She pulls the faun away as it loses consciousness. (Y/n) takes scissors and some of Celestabellebethabelle's hair. Mabel enters the fortress. "No wait! Stop!" She shouted. "Mabel! Shh! You'll wake her up!" (Y/n) scolded. Mabel takes the scissors. "But this is wrong, guys!" She said. "But protecting the shack is good." Wendy argued. The unicorn gets up and sees Mabel with the scissors. 

"What? Doth mine eyes deceive me? Thief! You shall never be pure of heeeaart!" She said. "No! You don't understand! I just want to be good like you!" Mabel protested. "Whoa, whoa, whoa, you gotta be kidding me." A blue unicorn enters with a purple unicorn. "Yo, C-beth, are you seriously pulling this "pure of heart" scam again?" The blue one asked. "That is messed up, man." The purple unicorn said. "Wait, scam?" (Y/n) asked. "Kid, unicorns can't see into your heart. All our dumb horns can do is glow, point towards the nearest rainbow and play rave music." The purple unicorn plays music. "Yeah, the whole "pure of heart" racket is just a line we use to get humans to leave us alone." The blue one said. "Guuuyys. Shut uuupp." Celestabellebethabelle said. Mabel crushes her notepad with "Mabel's Sins" written on it furiously. "All this time. All this time I thought I was a bad person. But you're even worse than I am!" Mabel throws the notepad on the ground. (Y/n), Candy, Grenda and Wendy gasp. "Okay, fine. So you learned our secret. We're jerks, okay? We have more hair than we know what to do with, and we keep it to ourselves just to tick humans off. What are you gonna do about it, huh, huh? What are ya gonna DO?" She mocked. Mabel punches her, and everyone gasps again. "Oh!" Celestabellebethabelle said. "WHOO! Go Mabel!" (Y/n) cheered. "Join the dark side!" Grenda shouted. Mabel growls and tears the unicorn image off of her sweater. "Fight! Fight! Fight!" (Y/n), Candy, Grenda and Wendy chanted. "Oh. So it's a fight you want. Well, then it's a fight you're gonna get!" Celestabellebethabelle said. The humans and the unicorns run at each other.

Time Skip

"Ugh, I'm so embarrassed about earlier. I'm such an idiot." Dipper said. "From now on, no more secrets between us. We're not the first two idiots to be tricked by Bill, boy. But if we work together, we could be the last." Ford said. "But what about Bill? I broke the machine! Now we have no way to protect the shack!" Dipper said. Mabel slams the unicorn hair on the table. "Did someone say "unicorn hair"?!" She asked. (Y/n), Candy, Grenda, Mabel and Wendy are behind her. They are all beat up and covered in unicorn fluids and tears. "Uh, no, actually?" Dipper said. "Oh. That would have been perfect. Either way we got some unicorn hair!" Mabel waves it in Dipper's face. "Also some unicorn tears, unicorn eyelashes..." Candy gestures to Grenda, who has unicorn eyelashes. "They finally gave us this treasure just to get rid of us!" (Y/n) dumps the treasure on the table. "It... can't be! This is a great day, girls! With this unicorn hair, we'll be able to completely shield the shack from Bill's mind-reading tricks!" Ford said. "Is it okay?" Mabel asked. "Better than okay; it's perfect! You both protected your family. You're a good person, Mabel." Ford said. "Thanks, Grunkle Ford, but today I learned that morality is relative." Mabel said. Stan runs in and grabs the treasure. "MONEY!!" He then runs away.