Dipper stared lifelessly into empty space as boredom overwhelmed him.

Mabel laid beside him, the roaring thunder outside had caused her to ask Dipper if she could sleep with him, for just this one night. Dipper was reluctant at first but eventually Mabel was allowed in his bed.

This night was different, he could not sleep, and for some reason he seemed to be into the moment more this day, causing him to have to take care of his 'problem' more often than usual.

Puberty was not easy on the boy, he had found himself in more than one occasion having to either walk like a gorilla or have to head to the bathroom and fix his problem.

Mabel, still deep asleep, begun to twist and turn, eventually laying down on Dipper's sensitive spot. Dipper felt a tingly sensation in between his legs , he moaned and looked down. His eyes widened as big as saucers and Dipper began to blush. With the realization of what his sister was doing, Dipper was unsure of what to do. Then once again Mabel began to move around, but this time she just moved her head side to side, thus rubbing Dippers member.

Dipper moaned intensely at this and screeched a little. Dipper's loud screech and moan was enough to wake Mabel up.

"W -w -what's going on?" Mabel said waking up, her eyes were gritty and she begun to look around. Once her veiw came into focus she realized where she was laying she quickly looked up at Dipper, she stared into his tomato red face and blushed.

"Oh my god! Uhh, umm, D- Dipper I - Im so so so sorry!" Mabel exclaimed.

She knew her brother had an erection, in fact she felt his throbbing member as she awoke.

"Umm, uhh yeah… y-you kinda were rubbing my… spot" He gulped before saying that, he felt weird talking about it in front of his sister. Even though he has always loved her more than any twins should. In fact every night he had a wet dream about her!

Dipper realized the possible opportunity to have Mabel pleasure him, since she felt bad she probably would do anything to help him. On more then one occasion has she done embarrassing things to him, even though it was never as severe as this, she always ended up doing something for him to make him happy.

"M- Mabel do you think you can… umm… help me?" Dipper said, his face was blushing so much that he though he might have a nose bleed.

"Uhh.. But D-" She cut herself off as she stared into her brothers eyes, then to his pants, then back to his eyes.

" Yeah.. I - I will H- help you…." She said reluctantly, though she actually was anxious to do this. This was dreamt by her many times before.

Dipper spread his legs, Mabel pulled his gray shorts down, revealing his medium sized throbbing member. Mabel grabbed ahold of it, causing Dipper to blush intensely and let out a 'cute' moan, at least it was cute to Mabel.

Mabel begun to rub her hand up and down his member. She smiled at this, and begun to rub his member faster.

Dipper's panting grew louder and begun to be let out at a fast paste, unlike the steady one he begun with.

Then suddenly warning Mabel begun sucking it. Dipper blushed and moaned.

"M- Mabel you don't need to g- go that -that far!" He said in between breaths.

Mabel ignored this and continued sucking her twin's member, faster and faster she went!

" Mabel! MABEL! Ahhhh! Stop, stop! I- Im going to cum!" Dipper shouted

Mabel continued sucking his throbbing member until he cumed. The sticky white fluid was squirted into her mouth, it tasted salty, Mabel liked it.

"How was that?" Mabel said looking at Dipper with a devious smile.

"Amazing!" He replied.