AUTHOR'S NOTE: Decided to start writing a Dipper/Mabel fic. First off, if you've made it this far and/or recognize my screen name, you know that this story will have mature content. This story will have an incestuous relationship. If you don't like incest, just move along. It's a fictional story. They're characters, not real people. I do not endorse, condone or approve of incest in the real world. If you participate in real life incest, you should seek counseling.

Enjoy! Please review :) -Jazmin

I don't know how it ended up this way.

Mabel and I had always been close growing up, closer than what was deemed average for siblings. We often chalked up our undeniably strong bond to us being twins. Countless hours reading taught me that twins, regardless of fraternal or identical, often grew to share a closeness that was unlike a typical sibling bond. All seemed right about it until puberty hit.

My hormones played mind games with me, veiling my sister in red light whenever I saw her. Countless times my eyes dipped lower than what was appropriate whenever we spoke or she bent over in one way or another. I fought the intrusive thoughts and tried avoiding her for a bit, I spent more nights showering in cold water than what was probably healthy, but anything seemed healthier than lusting after my sister. I would sit on the shower floor and let the cold water run frigid until my blood learned to flow properly.

All worked well until she started going out of her way to be near me. The more I avoided her as a teenager, the worse my problem became. I couldn't bring myself to tell her what was happening. I was utterly terrified of what she would say, but never the less I just wanted to lift the weight off my chest and purge my secret, But I couldn't. We experienced everything together, but now I felt so alone.

I can't count the times I've accidently walked in on Mabel wearing a towel, or how many times she walked in on me taking a shower. It was like a game of cat and mouse but no one was chasing anyone. The temptation was too much everytime it happened. Each time I would say nothing. Our relationship as brother and sister tethered on a very delicate edge during highschool. At least it did on my end.

Somehow Both of us ended up wanting to attend the same university when time for college came around, which our parents were thrilled about. Not willing to pay separate room and board for two kids, they arranged for us to rent a two room apartment off campus. Apparently it was cheaper...and they assumed we'd keep each other out of trouble. I couldn't fight back due to the fear of breaking my sister's heart. She would have thought I hated her, which was not the case.

Of course Mabel had boyfriends. I tried dating a couple of times but it never actually made it anywhere. Guys came and went in Mabel's life, all of which were casual...according to her. None ever went in her bedroom, nor did she ever go to thiers. I knew she hadn't slept with anyone of them because she was almost always home. With me. All of our first semester had been house bound for the most part. We spent Fall not really doing much.

For months she doted on me, and worried. She felt I was being introverted and thought maybe I was depressed. Being my sister, she would cook and check in on me, always making sure I was okay. If only she knew what was happening beneath the surface. By Winter, I had adjusted to having her with me all the time.

Living with her alone actually helped alleviate some of my lust. Being with her and having her dote on me gave me a taste of what siblings are supposed to be like. Concerned for each other's well being, platonically affectionate, ect. ect. The underlying lust was still there, but muted itself. For once, I wasn't bombarded with sexual signals from my brain. And for once, I could actually put myself in the dating scene once my fixation with Mabel became less intense.

I met a girl named 'Tammy', one who was the complete opposite of my sister. She was tall, had short cropped black hair and vivid green eyes. Her attire consisted of more rebellious designs and denim jeans paired with leather boots and belts. She wasn't girly like Mabel but she was certainly interesting. I liked her attitude enough, and she wasn't overbearing. She just wasn't 'nice', according to Mabel. Tammy was pretty much distant but Mabel dealt with her, all was well though.

When I FINALLY had everything under control, both Tammy and Mabel threw it all off.

Earlier in the day I came home in a bad mood. Tammy and I dated for about a month and everything seemed to be falling out of place. She wouldn't hug me, hold my hand or even really acknowledge me as her boyfriend. I initially took her distant nature to be a result of a new unfamiliar relationship and assumed she'd warm up to me, but it didn't happen.

After going to her house for a date and arriving to a living room full of her friends with the excuse of 'oh, they called last minute and really wanted to come over', I left. I was frustrated and beyond aggravated, stomping in the snow as I walked home. I wanted affection, I wanted a relationship. More than that I wanted Mabel. Without Tammy to be the substitute, I was quickly plummeting back to my temptations. I was devastated.

Mabel saw me come home and immediately knew something went wrong. I refused to talk to her about it. She grabbed my sleeve urgently to comfort me but I pulled away with my chest tight and pants threatening to grow tighter. I wanted so badly to be in her arms and let her hold me, but I didn't trust myself. I didn't trust myself at all.

After showering and passive aggressively crying under the flow of cold water, I found myself back to square one as I sat on the shower floor letting the cold water pelt me. I convinced myself that it was in my head, that nothing I craved sexually or romantically from Mabel was actual valid. It was a childhood mix up. I was too close to her growing up so my brain mixed up signals. That was it. It was a mix up, just an illusion. I could fix it and never want her that way again. It wasn't normal.

That day was unusually quiet. After I came home and rejected my sister's comfort, she avoided me and kept to herself. After I had showered I went to my room and put on clean boxers and a T shirt to relax. Nothing I did eased my mind and I kept envisioning the woman in the next room. I eventually resorted to playing the most violent and angry videogame I owned in an attempt to vent my aggravation.

Night time came around quicker than usual being it was winter. Barely supper time and it was dark. Mabel took a shower about an hour after mine but I hadn't heard any activity from her since. I bludgeoned the head of an ogre, pressing buttons angrily, when a knock on my door caught my attention. It was unusually soft in comparison to Mabel's usual loud and silly nature. Normally she would have knocked loudly in an attempt to annoy me light heartedly.

I must have taken too long to answer her because her voice piped up from behind the door.

"Hey Dipper...could I come in?" she asked me gently, I could hear her hand on the door knob as she waited for my usual 'yeah, go ahead'.

I reflexively said yes, internally cursing myself as I knew personal space was the safest route for right now. Not to mention I was wearing boxers. Of course Mabel came in right as I answered her. Her hair was up in a ponytail, a fashion she took up during the start of college. Something about wanting change. The hairstyle made her look older, along withher lackof braces. Her pajamas weren't as flamboyant and colorful as they once were, as she stood in my room she wore simple green long cotton pants with a striped pink spaghetti strap camisole.

I kept playing my game as she came in, shutting the door behind her. We lived alone but she knew I had a quirk about keeping my door shut, something that she picked up on. I could feel her near me as I scrolled through my inventory and prepped for a boss battle, the smell of her shampoo was intoxicating.

She sat down next to me on my giant old bean bag which was on the floor, giving my lack of pants a quick glance. I scooted over a bit, which she assumed was to make room but was actually to avoid physical contact. She said nothing as I played, just watching. It was a nice moment, nerve wracking, but nice. She stayed quiet for so long that she actually scared me when she spoke up.

"Dipper.." I flinched and she coughed awkwardly before continuing. " Sorry..uh.. can I talk to you?"

"You are talking to me" I laughed nervously, willing my eyes to stay glued to the tv screen as I played.

Her hand rested on my bicep softly and she scooted closer to me, talking to me very gently.

"I'm serious Dip, what's going on with you? You're all wound up and mopey all the time." she told me, "You're not the brother I used to know... we were so closer, Dip. You pushed me away earlier, you're worrying me. Did I do something?"

Never in my life did I think Mabel would ever confront me about my behavior. She spent years saying nothing about my ever growing distant behavior or my gloomy demeanor. She always combated it with getting close to me or seeking to comfort me...the first time I reject her and she calls me out on it all after these years. Nervous, I tensed.

"No, of course not. You didn't do anything" I assured her honestly, because it was true.

She hadn't done anything. It was all in my head. Just in my head.

"Then what's going on? You've changed. What happened today? Did Tammy do something?" She questioned seriously, her voice losing it's nurturing tone. "You came home mad and pushed me away. "

I tried changing the subject but Mabel wouldn't let me. She pushed the topic regardless of my clear unwillingness to discuss it. I became more aggressive in my videogame, fighting off enemies for the sheer sake of violence. I ended up telling her what happened earlier and she was livid, telling me to dump her.

"Look, Tammy and I aren't working out. It's rough but I want it to work. I just need some time to think."

"Well why don't you just leave her? " Mabel insisted. "She doesn't deserve you. What a horrible person. Find somebody else, leave her Dipper. "

Mabel made it sound so easy, as if she had it all figured out for me. Tammy was all I had to curb my lust for my sister, if I cut her off cold turkey I'd be walking in to a battlezone. A very angsty battlezone. My sister moved in closer to me, trying to get my attention but I kept playing.

"I can't just leave her! What good would that do?" I countered back, slaying a beast. "Tammy is here and I don't want to be alone. I can't leave her Mabel, you don't understand. There aren't too many options available for me...I'm not right."

Mabel ceased her talking briefly, my room falling quiet cept for the sounds in my game. Her hand squeezed my shoulder comfortingly and she offered her solution once more.

"Leave her."

"Mabel-' I argued, until I felt a hand push down my controller to pause it.

"Leave her, Dipper"

Mabel brushed away my controller, letting it fall to the floor, and brought her face in to kiss me. She craned her neck to reach my lips then grasped both sides of my face by the jaw to turn me so I'd face her. Her tongue slipped past my lips and tasted me, warm and soft. I dared not to touch her as she did as she pleased, my mind still not caught up with what was happening.

My brain caught up very slowly as Mabel tipped me backwards on the bean bag, never breaking out lips once. By the time my brain registered what was happening, and that it needed to be stopped, I could feel blood pooling in my groin. I could feel it, more importantly I knew she could feel it.

I had everything figured out. I had everything under control until now. I don't know how it ended up this way. I didn't stop her. She kissed me heavily and I didn't object, I gave in with a vengeance. Out make out was heavy and sloppy, evidence of no experience on both our ends. It didn't matter that there was a tad bit too much saliva, I couldn't help but run my tongue over her teeth where wires and brackets once were.

With me having no intentions of pulling away, Mabel was the first to do so. Mabel struggled to catch her breath and when she finally did, she tried bringing her mouth to mine again. The logical part of my brain nagged me to pull away, but there was no better alternative to coax me otherwise. Before I knew it, my sister was purposely grinding herself down on to my erection through the material of my boxers.

The bean bag wasn't very comfortable. It's lumpy feel was awful on my back but I didn't want to initiate a move of location on to the bed in fear that Mabel would lose her nerve and come to her senses. In retrospect I should have done so with the hopes of snapping her out of it, but the feeling of her warm thighs and heated pelvis was amazing on me.

I felt myself getting close, gritting my teeth while my back ached, and when I thought I was going to soil my boxers Mabel stopped. Her fingers curled in to cotton on my shirt as she hurriedly urged me to get up. I stood up, erection tenting my underwear obviously, and sat on the bed where she tugged me to. Once having me situated where she wanted, she crawled over me

"Mabel, are you sure that-"

"Sshh" she murmured quietly while straddling me again, her mouth by my ear. "Just let me."

Her hips resumed their back and forth grinding, rubbing her core on me. Her breathing was heavy as she struggled to stimulate herself enough through the layers of material we were wearing. When she felt she was close, she couldn't finish. She became visibly annoyed, unable to reach climax. I vaguely wondered how many orgasms my sister has had in her life as I brought my hips up to meet her movements. She seemed to know what she wanted, but as far as I knew she was a virgn. I had been fairly certain she was a virgin.

Moving my hips offered her some help and she responded to me beautifully.

"Mmm" she gasped.

I heard her first moan and couldn't have been any more amazed. I snapped my hips up as she needed me, desperate for relief. Intrusive wet dreams didn't compare to this. Seeing my sister on me, needing me to orgasm, inflated my ego and stirred up a burning arousal stronger than I had ever felt. I bucked her up and down until finally her nails dug in to me through my shirt as she came.

I watched her come down from her release, ignoring my swollen member which leaked with desperation. Her orgasm left her a little foggy as she recovered from the rush of adrenaline and endorphins. Now would have been the perfect time to see just how wrong my fantasies were and come to my senses for real, but I was too far in. When my sister looked me in the eye and made her desires perfectly clear, nothing could have possibly stopped me from giving her what she wanted.

I sat up against the headboard, careful not to dislocate Mable from her position on me, As I sat up, she followed me and repositioned herself. Her chest was right in my face and I could feel the ridges of her bra with my chin. Without asking, I reached up and peeled the straps of her camisole down over her shoulder and let it bunch at her waist. She didn't stop me as I pulled down the cups of her sleep bra, Instead she reached behind herself and undid the clasp.

Her bra was tossed aside and I leaned forward to enjoy what was right in my face. I really didn't know what I was doing but I knew what I wanted. I pulled her hair of it's hair tie and let it spill. Kissing her fairly ample chest, I suckled at the plush flesh and took in the smell of her soap. She moaned and tried grinding herself down on me again but the change in position had changed the alignment of our pelvises. A swipe of my tongue to her budded nipple and her throaty moan turned to a needy whine.

"Aahh Aahhh" she moaned brokenly as I used my tongue to play l with her sensitive peaks. I reached my hand down to the space between her thighs and she gasped once my fingers made contact with her pajama pants. "What are you doing? "

"Just go with it" I assured her, releasing her chest to speak. "Please...oh my god"

I groaned in amazement at the wetness I felt once slipping my hand down the front of her pants and under the elastic band of her panties. Her skin was smooth and slippery as I explored, rubbing her juices around with my fingers. There wasn't much room to move between us, my hand being partially trapped, but I touched her slowly and she moved her hips to help herself to what she wanted.

Sitting underneath Mabel as she rode me, I watched her breasts bounce. Her long curly brown hair fanned her slender shoulders in the moonlight peering through my bedroom window of our shared apartment and in the next room over was her bed, empty and waiting for her. She should be curled up with a pillow sleeping, but here she was. Her fingers curled themselves around my upper thighs, clenching them while she pressed her hips against my hand.

I didn't dwell on the realization, instead I pulled my hand out much to Mabel's dissatisfaction. I was painfully aroused and needed to know how far she wanted to go with this. After what we just did with most of our clothes on, I couldn't imagine what was to happen once they came off.

"M-Mabel...where is this going?" I asked her, feeling the veins in my forehead pulsing with the same tempo as my dick. "I'm going to lose it, and fast"

She pulled the bunched material of her camisole off her waist and threw it to the side before taking me by the shoulders and pulling me to her. The momentum of her movement landed her on her back with me on top of her. Her head was a mere few inches from the footboard but she didn't care. She tried wiggling out of pants.

I ended up helping her, taking her pants and underwear off. I pulled off my shirt and underwear, not the least bit self conscious with my sister. She on the other hand was slightly embarrassed to have me staring at her so intensely but didn't hide herself from me. She was actually very receptive to me. As nestled my hips between her legs, she spread them wider, welcoming me. Once again we were connected the way we had always been before my anguish.

Emotions took over and I nearly cried. The feeling of isolation was gone as she hugged me to her. My chest shuddered and Mabel felt it in hers. She immediately worried about me and pulled me to look at her.

"Dipper, what is it?" she asked her voice alarmed. "What's wrong?"

"I've felt so alone" I choked out, trying not to cry and ruin what was happening. "So, So alone"

Mabel took my face in hers and shooshed me soothingly.

"You were never alone, Dipper"

In that moment it finally hit me. All that I had gone through, Mabel did too. She struggled with it all alongside me behind closed doors. The realization calmed my brimming tears, taking away the remorseful worries. I instigated a kiss between us, beyond relieved. Hand gripping her thighs I squeezed them reassuringly as the head of my penis bumped her and she gasped.

"Do you want to use protection?"I questioned, realizing the dangers of what we were going to do.

Mabel shook her head no, holding my shoulders were steady hands.

"I'm protected...just promise me one thing before we do this." Mabel requested, kissing the stubbly skin of my jugular.

"Anything" I promised, groaning deeply as her soft lips kissed my stubble.

"Leave her"

Thanks for reading! Please let me know your thoughts!