A part of Smutmas 2017.
NSFW.
Mabel was almost quivering with excitement.
“Dip! Dipper, look! I found it!” Her brother almost tackled her as she started to pull a gold-bound notebook out of her sweater, and instead yanked her further down the trail, around the bend as the Northwest Manor disappeared from view behind them.
“Mabes, you know how Pacifica is about touching her stuff, especially her diary.” He eyed it suspiciously. “If I remember right, last time she caught you trying to sneak it out, she had threatened to have it legally carry the same penalty as first-degree murder if you took it again.”
His twin just blew a raspberry. “Pshaw, Dipper, where’s your sense of adventure, of mystery? I’ll bet Pacifica has some killer encryptions in this bad boy!”
Dipper just sighed as he followed her back towards the direction of the Mystery Shack, but his curiosity was ablaze at what he might find cyphering the contents of the diary.