~Summery~

There is a secret about the Mystery Twins, that even they don't know. Beyond the monsters, and weird. Outside of the house of their Great Uncle Stan, and the town known as Gravity Falls. Dipper and Mabel Pines, have both been fighting feelings for each other since before that first fateful trip to visit their Great Uncle, or Gruncle as they called him, Stan. Those thoughts and feelings were unnatural... wrong... immoral... sick. Sadly, they couldn't help but feel these things. It's not like people can just turn off what they feel, right?

They both had talked about their feeling... who else could they talk to about it? Who else could they have told without being judged? It was always them looking out for each other, so they knew... even if the other didn't feel the same way, they could trust that it would be held in confidence. They both had expected the other to hate them... they expected to lose their best friend... but they couldn't keep it in anymore. Couldn't hide it anymore, because the secret was eating away at them.

It shocked and relieved them both to know that the other twin harbored the same feelings, and that they wouldn't lose their best friend. However there was another secret... one they didn't know about, one that could change the very dynamics of everything they know. But for now, there was the matter of what was acceptable and what was not. Feeling this way would have to be acceptable, because neither could change how they felt, but actions... actions fall completely in the unacceptable pile... until.

(Dippers PoV)

Dipper and Mabel had been invited to their first party since they had started high school last year. They were both fifteen, and still pretty much went, and did everything together. Of course being twins, always having the other for as far back as they could remember. Well it was hard to give up a friend that you'd had that long. Oh Dipper had heard the rumors about him and his sister, luckily none of them knew how both him, and Mabel really felt about one another. It had become more often that they'd talk about how they felt, if only to try to enforce the unacceptable rule... it needed to be enforced, they couldn't do anything that was wrong... nothing that could shame them.

Dipper had spent hours with Mabel, her helping him decide what he should wear. Mabel had her own style of fashion, that had went from flashing, and shiny objects to just plain retro. He liked how his sister looked... maybe a little too much. But in his mind he could think about what he pleased, so he did. She fell out of the sweater phase and ended up in a group that dressed like they were from like the 70's. The long flowing skirts his sister had taking a liking to, looked great on her. The two braids on either side of her face looked nice, he even didn't mind the temporary tattoos that she sometimes wore here or there. Cheeks, arms, ankles... wherever Mabel could place them really. This was his sister, and though he could never admit it outside his family... he loved her... and not like he should his sister.

"You dressed yet Bro-Bro?" Mabel called through his door, Mabel was better at playing like she didn't have feelings for him. She had always been touchy feely with him, was always hugging and kissing him on the cheek. Most people didn't even notice that she did, and if they did... that was just Mabel... but he couldn't do any of that to help restrain himself, because he wasn't like that.

"Yeah, I'm about ready... listen Mabel... are you sure this is..."

"Yeeeaaahhh Broseph. Of course I'm sure. Have I ever steered you wrong... alright... okay... have I steered you wrong lately? That's what I thought, now come on!" Mabel bounded into the room without waiting for an answer, she hadn't really grown out of that bundle of energy phase. He just stared at her for a moment, she had went with a black jean skirt instead of her normal attire, and a red shirt that hugged her body... which he had to admit was perfect, and the bracelets and necklaces... She had lost that baby-fat two years ago, and had blossomed well... too bad he was still a human stick figure. He was dressed in an identical outfit, except pants instead of a skirt... of course Mabel liked being a twin, and dressing alike... seriously it wasn't like anyone was going to doubt they were twins. Everyone knew.

It wasn't that far of a walk to the party, it was being thrown at a friend who lived a couple blocks over... which was good, they didn't want their parents knowing what kind of party. This would be the kind of high school party where there would be drinking and maybe excitement... maybe he'd find himself a girl that could take his mind off his sister. Wouldn't that be perfect, because really... what kind of future could you have with your own twin sister? None.

Once they stepped into the house, there was the normal announcement from the once closest to them that announced the twins had arrived... as if they needed someone to say they arrived, or that they were twins. The fact they walked in, and looked almost the same, should have been apparent. Drinks were pressed into both his and Mabel's hands, without really seeing where they came from. Then again this was that kind of party. The twins wove their way through the party, trying to find anyone they knew. And the drinks... while they both thought they tasted horrible... became better with each new cup slapped into their hands. At one point in time the twins decided to split up and do some searching. Dipper wasn't sure if she had the same idea as him... find someone else.

A couple hours went by, and Dipper didn't need to be told that he was nearly thrashed. Him and Mabel had never experimented with drinking... he was sure the others here were not as drunk as him... which he would have thought they had before... if he was able to really think. Finally he decided to go in search of his twin, he wasn't having fun anymore, and he hoped she wasn't nearly as messed up as he was... someone needed to lead the way home... and he wasn't sure it was going to be him.

"Hey there Cutie." a slurred voice called from behind him. Couldn't have been talking to him so he continued on, until something grabbed his arm, "Hey... did you hear me?"

"Oh..." he turned around, and found Mabel... a more drunk than him Mabel at that. "Mabel... what happened to you?"

"Huh?" she looked down at herself, not that there was anything apparently wrong, he'd only meant how much had she drank... but neither him or her could figure that out right now. "Dunno... but hey... wanna come home with me?"

"Mabel..." He was obviously more sober, well less drunk anyways, than she was... another drink pressed into his hand, not sober enough to not drink it though, but wasted enough not to get what she meant. "We are going home together."

"That's what I like to hear, Cutie." Mabel leaned close to him, and he hoped that his breath didn't smell as strongly of alcohol as hers did. Then that thought was blown out of his mind as she kissed him on the lips. When it was over, and Dipper could actually think, he looked around to see if anyone noticed... luckily it seemed no one had.

"Mabel... you know I'm your brother right?" He was worried... and intrigued by this Mabel.

"Pffft... no your not... wait..." She got really close to him, so close that she wouldn't be able to really see him anyways. "Ppffftt, Okay so you are... so what about that going home thing? Yes? Or yes?"

"I think it's time to go home... you've had way too much." He didn't realize that he'd had way more than he should have as well. Didn't matter, he needed to get him and his sister home. The first party might have been a bust, they didn't meet anyone... next time though They'd meet someone next time.

"That's the spirit!" before he could react she spun him around... which made his stomach lurch, and hopped on his back. "To the house Bro-Horse."

The last cup he'd drank had finally reached the rest in his stomach, and maybe that red plastic cup was just enough to put him over the limit, as he galloped... well... as best as he could being drunk, with a drunk passenger on his back, through the sea of people, and out the door. After falling several times landing in the grass, they managed... he managed to gallop to their front door. At least he hoped this was their front door... the last two houses had angry people inside, that didn't know what time it was... they kept asking him if he knew, and got really angry when he said he wasn't sure. He'd make sure never to visit them again.

He opened the door to this one, and looked inside... it looked like the right place, his parents car was in the driveway. Yeah this was it. Mabel had spent the last half of the gallop/ride whispering things in his ear that he couldn't quiet make out. Between being drunk, galloping, and her slurred whispering... he just couldn't make out what she had said, so like normal he just agreed with Mabel, it was better than arguing.

"Is this the right one Dippy?" Mabel asked from over his shoulder.

"I think so... so be quiet... we can't let mom and dad find us like this." He had tried to get his sister off his back, but she wouldn't budge, so he carried her up the stairs on his back, which was a lot harder than he imagined... mostly after laughing and galloping, in the middle of the night... most of the way home.

"Can do!" she made a shushing noise, then whispered 'Can do.' in his ear... Luckily he didn't hear anything upstairs that would mean their parents were up... he actually hoped that they wouldn't be angry in the morning for being out so late... he couldn't remember if he gave them an excuse...

Once in Mabel's room he collapsed on the bed with Mabel... he wanted to get up, but he was too exhausted so he just laid there. As Mabel crawled over him because she needed the restroom. He had enough energy to kick off his shoes and lay back in the bed as Mabel wobbled back into the room. She once again crawled over him, and laid on the other side of the bed... She looked like she had been sick.

"That... was... horrible. Lets never do this again Bro-Bro." He didn't feel like he needed to throw up, but he was dizzy. He looked over at Mabel, and nodded his head.

"No kidding... never again." Mabel curled up to her brother, and Dipper didn't care. He wanted to be close to his sister, and while neither felt good... this was more or less comfortable for him.

(Mabel's PoV)

"Mabel..." He knew who she was... so much better than just hitting on some random stranger... though she had to admit, he looked pretty familiar. "We are going home together."

"That's what I like to hear, Cutie." Mabel leaned close to him, a smirk on her face, and kissed him. It wasn't that this boy was anymore special than the others... but this one reminded her of someone... someone she wanted.

"Mabel... you know I'm your brother right?" She just stared at him like he was insane... how could he be her brother. Her brother was somewhere else... and she wouldn't be kissing her brother... not in public... wait no... she couldn't kiss him because he was her brother. Stupid rules.

"Pffft... no your not... wait..." She got really close to him, Hmm, she thought. This was her brother... oh well right? Let the offer stand! "Ppffftt, Okay so you are... so what about that going home thing? Yes? Or yes?"

"I think it's time to go home... you've had way too much." That wasn't a no... she couldn't begin to wonder what kind of things would happen once they got home... She hoped it was fun.

"That's the spirit!" She spun her brother around and jumped on his back. "To the house Bro-Horse."

It was fun as she rode on Dippers back... even the couple of times that they fell was fun... at least her mount, that is Dipper had sense enough to fall in the grass and not on the sidewalk. Near the last half of the ride, she was not feeling too well... maybe it was from being shaken during her ride, nothing romantic on her mind any more. She kept asking Dipper how much longer... Then we went to the wrong house twice... And each time, Dipper galloped away from the door as the people inside threatened to call the police... Still very fun. Then he stopped in front of another house, this one looked right.

"Is this the right one Dippy?" She asked from over his shoulder.

"I think so... so be quiet... we can't let mom and dad see us like this." he whispered as he started up the stairs. It seemed her horsey was starting to get tired... but he'd made it this far... he'd make it the rest of the way, right?

"Can do!" she made a shushing noise, then whispered 'Can do.' in his ear... then giggled. This was kinda fun, they should do this every night!

Once Dipper collapsed on the bed, she crawled over him, she needed a bathroom... now... she was going to be sick. She slowly made it out of her room and across the hall to the bathroom, then vomited in the toilet. Worst idea ever... they should not do this every night... they shouldn't do it ever ever again!

"That... was... horrible. Lets never do this again Bro-Bro." She looked over at him with a grim face, after crawling back over her mount.

"No kidding... never again." Mabel curled up to her brother, she didn't care this was her brother... she loved her brother... more than she should, but for some reason that didn't matter at the moment... the fact it was wrong didn't matter. She closed her eyes curled up against his side and went to sleep.

The next morning Mabel woke up... did she wake up or was she dead? Her head was pounding, her legs hurt, she had a horrible taste in her mouth, and something was squeezing her. She actually couldn't remember past kissing the boy she'd been talking to at the party last night... how did she even get home, she wondered.

She opened her eyes... the light from outside was evil... it caused her head to hurt even worse, but that wasn't all that caught her attention. The arms, that were around her waist and under her neck caught her attention... did she bring that boy home with her... did they... A quick inspection with her hand told her she was fully clothed... she let out a sigh of relief. It wasn't like she wasn't willing to lose her virginity... she'd just kinda like to... you know, remember it.

Back to the problem at hand... if her mom or dad walked in and saw some strange boy in bed cuddled up with her... she'd be dead... dead-dead. With no hope of escape... her heart sunk when she heard the foot steps, it was her mom. Coming to wake her up... oh she was dead. She might as well start thinking about what she wanted on her head stone. The door opened and she kept hoping that she would disappear.

"Mabel... well, isn't that cute. I haven't seen that in a while." Her mother beamed at her... not the reaction she was expecting... "Wake up your brother and you two come down to breakfast."

Then she was gone... that was it? That's all for having a boy in your bed... TV and books go way over board. She turned her head to see who it was... Dipper? He was the one all snuggled up with her... wait, was Dipper also the boy... of course she loved her bother in ways she wasn't allowed... did she really kiss him... in front of all the people they knew? They were going to have to change schools... that was it. She'd doomed them both.

"D-Dip?" she moved a bit, earning a grunt from Dipper as his arm tightened around her. "Possessive much? Come on, mom said we need go down for breakfast."

She didn't know what it was about what she said, that caused Dipper to jump up and run out the door. Maybe he was really hungry... she really didn't feel like eating, her stomach was still acting up. She managed to get up and out of the room, then noticed that Dipper didn't head downstairs he was throwing up in the bathroom. Maybe mentioning food set off a trigger... she wasn't sure. But she went down anyways and told their mom that Dipper didn't seem to be feeling good... Luckily, her mom just said, 'That must be why he spent the night in your room.' such a perfect excuse... one she couldn't just let go, so she went with that.

She'd eaten about as much as her stomach could handle, and said she wasn't feeling all that well either. Of course her mother just said something about being so close together, maybe they had picked up a bug somewhere... she wasn't paying attention she was already heading back to her room. The bathroom door was opened and empty. As was her room. She continued on to Dippers room, she found him half on his bed, half kneeling on the floor.

"What hell is this?" He muttered, he must have heard her footsteps. She walked over and helped him the rest of the way into bed, and crawled next to him. "What did we do?"

"Well we got drunk... we kissed... you threw up... I think I did last night sometime... Mom thinks that we picked up a stomach bug, and that's why we are sick... so as long as we don't mention anything, we are home free." Dipper stomach just lurched as he nodded.

"I'm not saying nothing... ever... not even opening my mouth." he muttered as he pulled her close to him. She couldn't blame him, he looked worse off than she felt, and it wasn't like she didn't want to be close to her Bro-Bro. So she snuggled close and went to sleep again, hoping to feel better, when she woke... maybe by then the... 'we kissed in front of our friends' will pop into his mind and we can figure something out.