What cuts the deepest
Six months later
Dipper and Mabel were cuddled up on the sofa watching Duck Detective, Mabel sat inbetween Dipper's legs with her back against his bare chest, his chin resting gently on the top of her head while he played with the ends of her hair. The next thing either of them know the living room lights have been switched on, waking the twins who had fallen asleep, up. They immediately let go of each other and try to put as much distance between themselves as quickly as they could
"WHAT ON EARTH IS GOING ON IN HERE!" Stanford Pines demanded, surveying the scene before him, Dipper glanced across the sofa at Mabel who looked like she was moments away from bursting into tears. Dipper cleared his throat and steadied himself, ready to explain to their Grunkle Stan that they were an item. He must have been taking longer than he thought cause Stan sat down in his armchair and ordered
"Well hurry up and spit it out!" Dipper took one more deep breath and began to explain to his Grunkle the feelings that he and Mabel had for each other and how they knew this was wrong but they couldn't help themselves, that they loved each other and how they had kept this secret going for the past six months. He finished his explaination with a defiant stare towards his Grunkle as Mabel placed her hand on his thigh, Stan took off his glasses and rubbed his eyes before replacing his glasses. Sighing he mulled over what his reply was going to be before finally deciding on the right words
"If I'm totally honest with you... I can't say I'm shocked, Hell I told you before that you two get on far to well for siblings, what I didn't say was you're more like lovers than anything else and heh I guess I've been proven right. Just on record as your great uncle I can't condone this relationship. But... I know that isn't going to stop either of you and it is obvious that you two make each other happy. So I'm just going to leave it at this... Please for the love of God, don't let yourselves get caught again."
"We won't. Promise" Mabel sniffed, wiping her eyes on the sleeve of one of her sweaters. She got up from the sofa, letting her hand lift from Dipper's thigh and walked away, going upstairs to her bedroom.
"Thanks Grunkle Stan" Dipper whispered, almost to himself as he stood up ready to follow his sister to their bedroom
"Hey kid." Stan called out, bringing Dipper to a stop in the hallway
"Yeah?"
"She is one hell of a girl, don't do anything to ruin what you both have okay?" Stan advised
"I won't. I love her." Dipper replied.
Next summer
"Mom, Dad. Can we have an answer on whether or not me and Dipper can go and live in Gravity Falls full time please?" Mabel asked as she was sat at the breakfast table
"Mabel dear, you've been on about this all year since you left last summer, and me and your mother have been thinking about it and we'll send you out a letter with our decision while you're at Stan's this year, deal?" Mr Pines explained
"Oh, okay" Mabel sighed
"Now you two had better hurry up and finsh your breakfasts, you don't wanna miss your bus" Mrs Pines warned the twins.
Two weeks later
"Hey kids! You've got the letter down here from your parents!" Grunkle Stan called up to them. Dipper and Mabel stared at each other with hopeful smiles, they had been asking all year, with Stan's permission if they could move in with him in Gravity Falls for good, giving them a whole host of good reasons why they should be allowed.
"Kids! Come on! Or I'll open it and read it for you!" Stan warned them. Mabel and Dipper suddenly came tearing down stairs and raced into the kitchen where their parent's letter was sat on the breakfast table, Dipper picked it up and tore open the envelope and unfolded the letter and read through it.
"Well? What's it say?" Mabel asked, Dipper turned to her, shaking his head and looking dejected.
"They said... YES!" Dipper announced, smiling broadly and throwing his arms around Mabel and embracing her tightly before remembering that Stan was stood right behind them
"Heh, sorry Grunkle Stan, if it's still okay with you that we move in here?" Dipper apologised as he let go of Mabel and turned to their great uncle
"It's still fine with me kids, as long as you can still keep your promise you made last summer" Stan told them.
"We will. Thank you so much Grunkle Stan" Mabel beamed.