Becoming the enemy

WARNING: reader discretion is advised… This story contains mature content, which includes, but is not limited to minor swearing, sexual situations, violence, abuse, death, and nudity. You have been warned…

Pinecest is not a stranger to the terms of sexual situations that will go on in this story. This takes place three years after Dipper and Mabel left Gravity Falls, and now they're returning to the place that holds precious memories, as well as nightmarish ones. Some old enemies will take action, and some new ones to this specific show will be given roles. Gravity Falls is a contained area of magic and impossibilities and is a small part of the multiverse. Thanks to a magical imbalance, dimensions are colliding. Characters will wake in foreign, unknown lands and make new alliances to defeat like enemies, along with powerful, new ones. Expect crossovers in future chapters. Though their enemies may not be their own, the balance of the universe and the dimensions that reside within it, which must stay separate, act as a beacon for unity. Coming together is the only way to keep the world, dimensions and all, from undergoing a dictatorship from dimensional deities that have the illest of intentions. Gravity Falls is the sole property of Alex Hirsch.

Chapter l

Sometimes, I feel as if he is still around. You think someone, or something, is gone, and then they show up in your dreams. It may seem like nothing, but when you're taking about a god, a demon of dimensions, anything is possible. Gruncle Stan finished him off, or at least, that's what we thought. My sister keeps telling me that I think too much; I should start being a little more like her: careless and carefree. Sure, I admit that my cautiousness may be a little extreme, but it's also the only thing that's kept my sister and me alive through our past adventures. Without my leadership, who knows where we would have ended up.

"Time's up, Pinetree". Those are the finishing words to every dream I have had that have been focused on him. I was usually alone, in a graveyard, staring down at the names of my beloved, which were engraved into the tombstones: Mabel Pines, Stanford Pines (He actually had two dates listed for his death), Stanley Pines, and my parents. The dreams were gruesome in the end but started out with happy memories. There had to be a meaning behind these dreams. They couldn't just be dreams, could they? Perhaps, they were trying to tell me something along the lines of "Nothing lasts forever", or "Happiness is temporary." The thought of losing any of them was too much to bare. No matter what, I would be there to make sure that nothing happened to my…

"Wake up, wake up, brobro, we're going to be late!"

I sprung up in complete surprise as I felt the full weight of my sister land on me. She shook me, till I pushed her off of me to get ready, I quickly took one step off of my bed but ended up getting tangled in my blanket, which concluded in me falling face first on the ground. Of course, this got a laugh out of my sister. "Kidding broseph, we still got, like, a bajillion minutes before school starts. Are you excited, our last day of school, then it is off to gravity falls. We finally get to see all of our old friends: Grenda, Candy, Wendy, Paaaciiificaaa." She stretched out her name in syllables, trying to get a reaction out of me.

"Are we still on this? I don't like Pacifica. I just saved her from a mansion haunting, and..."

"And totally fell in love with her. I get it brobro. She's a total hottie. Sure, things between us may have started out, rough, but we're totally cool now. So, from sister to brother, let me just say, I approve."

I gave a slight smile, "Whatever you say. As if I'd need your permission. Err, that is if I were to make a move, which I am not."

She giggled at my embarrassment. "I just want you to be happy, Dipping sauce. We all deserve a little love in our lives, especially since Wendy totally turned you down. Ooh, sorry. I, different topic."

"It is fine, Mabel. I'm over it. That was a few years ago. She's moved on. I moved on. You keep moving on."

I rubbed at my arms, then my wrists, as I looked at the alarm clock on my dresser. Fifty-three minutes till the bus arrives. She jumped onto the ground and sat directly in front of me. "You know, we have always been there for each other. We can talk about anything with each other." She reached towards me and grabbed my hands, turning them over, making my wrists face skyward. She traced her fingers along the white lines that overlapped my veins. "you don't have to resort to this." Tears began forming in her eyes, and this hurt me.

"Mabel, listen…"

"No, you listen. Do you know how many times I have thought of ending my life? People make fun of me. They think I'm weird, a-a-freak. And I deal with this every day. Do you know why I don't do this stupid shit? Why I don't just end it." I reached my hand towards her face as I wiped a tear away, using my finger. She grabbed onto it, holding my hand to her chest. "It's because of you, dummy. I couldn't bare to leave you here, alone. And frankly, I'm hurt that you'd do that to me. By ending your life, you'd be killing more than just yourself. You would be killing me. The third attempt, I was sitting by your side in the hospital room, wondering if that was the moment you'd leave me. You were different when you woke up, so our parents paid for counseling. Eventually, you decided for yourself that counseling was getting you nowhere. It hurt me when you stopped seeing a professional. You told me you were fine, and I said okay. Do, do you feel this." My hand was placed in between her breasts as her hand stretched out to my chest. "It's a heartbeat. I'm still alive because you're still alive. We came into this would together, meaning, we aren't meant to, to". She dropped her head, hiding her face behind her long bangs. I tried to comfort her, pulling her in and patting her back. She wrapped her hands around me as she buried her face into my neck. Her skin, so warm against my own. "We weren't meant to live in this world alone."

I pulled her back and lifted up her chin, "Mabel, there is nothing I can do or say to make it up for you. But I truly am sorry. I didn't think it affected you this way."

She slapped me hard across the face, but I wasn't mad. "You didn't think it would affect me? Really? You are my everything. You want to know why relationships with me don't last? It's because, I… never mind. We're going to be late if we keep this up." She stood up and walked to the door, then turned around. "And there is something you can do to make up for what you've done. You can survive. For me. Now, get dressed. Plan on going to school in your boxers. That would be one way to end a school year."

"What about you? Plan on going to school like that, in your bra and hardly-panties."

She looked down and came to a realization of the state she was in, but she wasn't shy. "Oh, you're right." She ran to the closet pulling out a bunch of random clothing. "That, no that. Uhh, I can't decide. Bro, what looks better. I want to look my best for the last day. And what do you mean hardly-panties? Sure, they may be a little cheeky, but they're there. Besides, this is my favorite pair, well, one of them."

"Please, those are beyond cheeky. Those were meant to be girl boxers. Those things are so far up your butt, they've practically transitioned into a thong. And why are we talking about this?"

"I don't know. And you can't dis my underwear. Not when you're wearing boxer briefs as tight as those. I mean, come on. Especially gray. Why didn't you choose black? Black is a color meant for hiding what you don't want to be seen. Those things are light gray. I can clearly see every formation in those things. But I have to admit, you have grown these past few years. Especially within the last minute." She stifled a laugh as she held her hand over her mouth.

I didn't have to look down to know what she was talking about. I could feel it. I held one hand over it, ashamed, but mostly embarrassed. Why did this have to happen now, in front of Mabel, nonetheless. "I am so sorry. It's just the breeze in here, and the thin fabric constantly rubbing against me. Please don't be disgusted."

She walked towards me, giggling, "Bro. Nothing to be ashamed of. You are a healthy teenage boy. We have both been given the talk, well I have been given it twice." She looked away, trying to forget Gruncle Stan's "talk". "You shouldn't apologize for something like that. Besides, your body sees me as a girl, not just your sister. How could you not get turned on by all off this?" She gives a 360-degree spin in slow motion, with her hands outward. She, then, grabbed her clothes and headed towards the bathroom, swaying her hips the whole time. "Well, you coming?"

"What? No. why would you ask me that?" I shook my head and grabbed hold of my clothes. "I'll get in after you."

"No time, By the time you're done with your shower, the bus would have already left." She grabbed my hand and pulled me along with her into the bathroom.

"Then, I'll skip today's shower. What's one day?"

"Get in there." She pushed me into our shared bathroom.

"Mabel. This is so inappropriate. We're siblings. We can't do these types of things." I was facing the wall, the only noise being the sound of her underwear being discarded from her body.

"Why? We used to bathe together when we were younger. What's the difference now?

Quickly, without thinking, I turned around. "What's the difference? We were kids. That was, like, 10 years ago. Our bodies and minds have matured, and…" I looked her up and down. Her breasts, not small, but not overly large, were displayed in front of me. He auburn hair hung past her shoulders, barely covering the hot pink buds that were her nipples. Her body was slim, but not too slim. She had a tiny bit of baby fat over her stomach, which was actually kind of cute. Her waist curved slightly in, and her hips went out like a slightly thicker hourglass. She wasn't fat. She was hardly chubby. She had just enough baby fat to not be considered completely flat on the stomach. A couple inches below her bellybutton was a small shaved patch of auburn hair, directly above her exposed womanhood. And her legs, long, smooth looking and completely sensual. I snapped out of it at the sound of her calling my name.

"Dip, you okay?"

"Huh, oh, yeah. Sorry, but… This is wrong. We can't, you do know this is completely beyond the boundaries of a normal sister-brother relationship, don't you?"

She gave a cheeky smile in my direction. "You were looking, weren't you?" She took my silence as an answer as she stepped into the steaming shower, motioning her hand in a way that said 'come here'. I shook my head in disagreement. "For crying out loud. Get in here before I have to pull those things off of you, myself. And I highly doubt you want my face that dangerously close to your erection…Oh, please. You didn't think I would notice, that thing is one small growth away from escaping the confines of your waistband. I'll even look away if you want. We can shower, looking away from each other."

She looked away from me, giving me the privacy to discard my boxers. "okay, here I go", I thought to myself. Slowly, the boxers found their way down my legs and to the floor. I felt a bit weird, a little dirty. Showering with my sixteen-year-old sister. Nothing was acceptable in this moment. I was crossing a line. I stepped into the shower and stood behind her. It was too much. The water bounced off of her shoulders. It formed streams down her back and trickled off of her buttocks like a multi-stream waterfall. Her hindquarters were of perfection. It was heart shaped. No, it was more like a perfect peach, split down the middle. I turned away, back against her back, as I tried to focus on my hair and body.

"Dipper?" I heard the movement of her body turning around to face my back. "So, um. You are the only guy to see me like this, and I, I want your opinion on my body if you don't mind." The last part was silent but still heard by my ears.

"Mabel, I don't think that's a good idea. Like, at all."

"Ohh, I see. You can't even look at me. Dipper, I'm sorry. For this. I just wanted some quality sibling bonding, even if it is in the shower. I mean, siblings should be the first to know everything about each other before a complete stranger does. Why can't you look at me? Did I do something? I know I can be a little too open, but I'd like for you to at least look at me. I wont judge you. I have seen pictures. I know what to expect. Pwetty pweeze."

I sighed and slowly turned around with my hands over my manhood. She reached for my hands and slowly released them from my private. This action was followed by a quiet gasp. "What? What is it?" I asked.

"It's, it's huge. Bigger than the ones they showed us in health class. It looks like it hurts." I nodded my head at her opinion. "Can I…?" She slowly extended a hand out. When I didn't say anything, she continued. "I read that it is not good to go too long like this. It has to be relieved. If you want, I can, you know. With my hand. So, you don't have to worry." Her voice actually sounded embarrassed, a bit shy.

"Mabes, this is wrong, and by doing nothing, I am also in the wrong. We are heading down a path that can't be returned from. I don't know if..."

"Please, I'll be gentle. We have made it this far. Nobody will ever know, except us. And if you hate me after this, so be it. I have never done anything like this."

"I can never hate you." She held my hands together and gave me the puppy dog eyes. "Mabel, I know what you're doing, but it's not going to work." She continued with the eyes, and also put her hands up, like a puppy begging. I inhaled, then exhaled. "No body is going to find out, right?"

"Nobody. Just us. A dark secret between siblings."

"Fine. I guess, just this once." She squeaked as she suppressed her happiness. "So, how do we start this, do we, kiss, or…"

She smiled at me. Her palm rubbed against my shaft as her fingers curled around it. Her other hand was placed under the weight of my balls.

"It surprises me just how you've grown." Her face was red. "How big would you say this thing is, 9 inches? And the girth, too. You got the whole package." Her hands released my balls as her fingers stroked my chest, muscle and all. "You have gotten strong within the last few years."

I gave a light moan to the sensation of her fingers rubbing my shaft. "And you have grown too. Your body is, wow."

"Aww, thanks. What do you like about it?" She smirked, which made it hard for me to answer.

"Your, your butt. Its so round and toned with just the right amount of bounce." Her hand moved slightly faster along my shaft as I felt it getting tighter, like something was about to come out.

"So, you're a butt guy, huh? I can work with this." She released her hand and turned around, so that her butt was touching the tip of my dick. She reached around, and grabbed my dick, adjusting it, so that when she moved, my penis rubbed between her butt cheeks. The sound of her moans filled me with urges I had to fight back.

"Mabel, wait, uhm." I tensed as bits of hot cum splattered along her lower back. Her back, too, arched at the feeling of warmth. She turned around with the biggest smile ever, as her hand readjusted around my girth. She stroked and stroked as I began to lose my mind. "Mabel, I'm about to, to,.." Quickly, she removed her hand from my throbbing erection as she lowered her mouth onto it. Just as the warmth of her mouth engulfed my dick, I released. Her cheeks puffed out at the excessive amounts of cum entering her mouth. She had to remove her mouth in order to swallow what I had given her, without choking on the rest. My erection began to deflate as it spit out the rest of its cum onto her face and her breasts. She licked away the amount that landed on her face as she stood up, rinsing the bit off her breasts.

"I'm so happy we got to do this. Was this, perhaps, your first time too? Blowjob, I mean." I nodded at her question. She pulled me into a bone crushing hug. "Oh, thank you, thank you so much for sharing that moment with me. I'll never forget it." My flaccid penis was now being rubbed against her nearly hairless womanhood. Had it been hard, it would have been inside.

"No problem. Glad I could, er, help." We finished washing each other off before getting dressed and heading to the bus. We were almost late, but thanks to the bus being a minute behind schedule, we weren't.