Work Text:
•Piedmont, California•
Dipper grabs his clothes and heads to the bathroom.
"Hey Dipper, are you going to take a shower?" Mabel asks
"Yes," he replies.
"And you didn't call me?!" she asks
"Mabel, I told you, we can't take baths together anymore," Dipper replies.
"Why not?!" Mabel asks
"Why not," he replies
"That's not an answer"
"And yes"
He goes to the bathroom, but Mabel follows him.
"Mabel, I told you," Dipper says
"I'm not leaving here until we shower," Mabel says.
"...Okay!..", Dipper gives up
He takes off his clothes, leaving only his underwear, Mabel is completely naked
"Mabel!"
"What's wrong? And why are you in your underwear?" she asks.
Dipper gives up arguing and gets into the shower, Mabel follows him
They start taking a shower, and at a certain point, Mabel leans against Dipper's back, who gets excited when he feels the girl's breasts.
"Dipper, pass me the shampoo," Mabel says
She looks at the boy, and notices that his dick is erect.
"Wow Dipper, that's huge," she says.
The girl touches him, even over his underwear
"Mabel!"
"Why are you like this?" she asks.
"Why do you think?! I can't help it, you're naked!" Dipper replies
"So I'm the one who left you like this?" Mabel asks.
The girl pulls down Dipper's underwear, freeing his cock
"It's really huge," she says, starting to masturbate him.
"Ma.. bel.. s-stop with that," Dipper says
But Mabel ignores him, and continues masturbating him.
"This girl..", Dipper thinks
He gets tired, and grabs Mabel's head, making her suck it.
Mabel gets scared and tries to break free, but Dipper won't let her.
She then decides to obey Dipper and starts the blowjob.
"That's right Mabel... just like that...", Dipper says
The boy forces his sister to suck him until he cums in her mouth
"It's bitter," Mabel says.
She stands up, and Dipper goes to her legs, starting to lick her pussy.
Mabel lets out a loud moan
"D-Dipper! Yummy!" she says, as Dipper devours her pussy with his tongue.
The girl quickly cums in her brother's mouth, who swallows every drop of her cream
"Now you're going to be an obedient little slut and get on all fours for me," Dipper says.
Mabel obeys
Dipper positions himself on Mabel's ass, and penetrates her asshole
Mabel lets out a loud scream as she feels her hole being opened
"Damn Mabel.. you're tight..", Dipper says
"It's obvious you idiot, I'm a virgin," Mabel says
Dipper continues fucking the girl's ass
"You little whore.. you wanted a boyfriend in the summer.. so now I'm going to put out your fire..", Dipper says, slapping Mabel's ass
He fucks her until he cums inside her sister
Mabel falls tiredly to the ground, while the water continues to run down her body.
"Get ready, we're going to do this every day," Dipper says.