I can't find any fan fiction stories about Dipper and Mabel's secret love for eachother, so I felt like making one for myself. Enjoy!
Also, the events that occur in the story happen after Bill was defeated, and rewrites the ending to Gravity Falls. Hope you like the story!
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Dipper just got back from a celebration party with Uncle Ford. The party was a way of saying 'thank you' to everyone who helped save Gravity Falls from Weirdmageddon. As soon as Dipper gets home, he heads upstairs immediately, not surprised to see Waddles and Mabel cuddling on her bed.
Dipper engages conversation with Mabel by saying "Hey, Mabel. How was it sitting at home without me?" Mabel replies with "It was fine, I always have Waddles to keep me cozy." Waddles makes a happy squeal. Dipper chuckles, and walks to his dresser. He pulls out his pajamas that make him looks like he doesn't want to grow up, but at the same time he has to. "Going to bed early?" Mabel asks. "Nope, just getting ready for a bath. That party made me feel uncomfortable and sweaty." Dipper replies. Dipper then walks to the bathroom and turns the bathtub faucet on.
As Dipper prepares his bath, he starts to take his clothes off. Mabel quietly walks out of the room and walks over to the bathroom. She unnoticeably opens the door wide enough for her to peek in and see Dipper naked. As Dipper walks to the bathtub, Mabel slowly walks in to the bathroom. As Dipper is climbing into the bathtub, he hears the door close and lock. Out of suspicion, Dipper turns around and sees Mabel in her pink sweater standing next to the door. Dipper quickly turns back around and covers his dick so Mabel won't see it.
"Mabel! What are you doing in here? I'm about to take a bath!" Dipper exclaims. "I know, Dipper, that's the point. Now, keep it down! We can't let Grunkle Stan hear us or we're dead." Mabel says in a low-key voice. "Dipper, I secretly love you and I've been waiting for the right moment to tell you about it." Mabel tells Dipper. They both blush. Dipper turns around and moves his hand away from his dick. "Mabel, I thought you hated me after you found out I was going to be Ford's apprentice." Dipper states. "I never hated you, I was just frustrated knowing that you were going to leave me." Mabel answers with sorrow.
"So, let me ask again, what are you doing in here?" Dipper asks Mabel. "I want to take a bath with you, if you don't mind." Mabel responds. "I don't mind at all. Actually, I would enjoy that a lot." Dipper expresses. Mabel undresses in front of Dipper, starting with her sweater. She then removes her shirt, and her bra comes off too. By now, the entire top part of Mabel's body is naked. Her lower body comes next, and she first takes off her shoes and socks. Her skirt comes off, and then her hot pink panties. She is now completely naked and Dipper is in shock. Dipper has never seen Mabel fully naked, so he has lots of feelings running through his head. Mabel walks over to the bathtub, her boobs bouncing up and down after every step. Dipper is amazed by his twin sister. Mabel climbs in to the bathtub, where Dipper is waiting for her. They now realize what's supposed to come next.