Dipper sighed. He had thought she would be different, that she would have understood. But the quiet redheaded girl had reacted like everyone else when she had seen him, the REAL him, what he was willing to do for her, for life, for love. Dipper knew she was throwing his life away, being with that nerd Robert, that HE was the one she was meant to be with. But, when he had brought her the bloodstained sweater, she had screamed and cried, threatening to call the police. What else was he to do? The television in front of him blared about the fire, about how tragically, nobody in the family was able to escape, how this was this was the latest terrible accident in this small, unlucky town. They would never find the stab wounds on the corpses, Dipper supposed; all the evidence of his deeds would have burned up with the rest of the pathetic house.

"Those who live in log cabins should fear the brightest flames," Dipper murmured to himself.

"Was that supposed to sound clever, dear brother?" Mabel sauntered into the room, wearing a sleek cyan jacket over a white, low-cut top and a short skirt. Dipper looked her up and down critically, secretly noting his approval. She winked at him. "Your work, I suppose?" Mabel said, motioning at the television. "Why am I even asking, your clothes still smell of ash. We shall have to get you out of those at some point."

"Ah, yes, of course, I had forgotten," Dipper responded, glancing down and brushing a fine coat of soot from his own crimson jacket. "The family provided no real trouble, but I wonder if it was really necessary. She would have kept quiet if perhaps one of her brothers had a small accident. Maybe an arm, or even an eye." A cold grin casually slid across his face, and he almost imperceptibly licked his lips. "But that would have been less fun, of course. Enough about my day; what have you been up to today, sweet sister?" In response Mabel slid her hand gently down Dipper's chest, before reaching back to pull a book from behind her own back. "Again with the magic tricks?" Dipper asked.

"It never hurts to add some flourish, brother. Make every action memorable. Do you happen to remember that chubby new boy, Gideon? Somehow, the clod found the third book somewhere in the forest. I 'persuaded' him to hand it over to me. A kiss on the cheek and whispers of sweet nothings is all it took, the lad is so gullible." Mabel giggled. "He must be illiterate, for if he had ANY idea upon what he had stumbled upon…" Mabel trailed off. "I do believe this calls for some sort of celebration, don't you?"

"Indeed, indeed," Dipper nodded. "What did you have in mind?"

Mabel's smile widened at these words. "Great Uncle Stanford is gone for the evening, off at some charity or another. We have the whole place to ourselves, and I do believe that we need to get you over that one girl - Windy, was it? This calls for drinks."

"Why, that is an excellent idea, you clever girl. I am certainly parched." Dipper flashed a smile at her and walked over to the liquor cabinet. "Shall I mix you a cocktail?" he asked over his shoulder/

"Yes, a gin and tonic would be lovely, thank you," Mabel replied.

Dipper carefully mixed her drink before pouring himself a particularly stiff scotch on the rocks, watching the brown liquor cascade down onto the pristine cubes of ice. He sighed, marveling at the light reflecting off his beverage, taking in the small beauty and swirling his glass around until the liquor had settled to his satisfaction . He brought the drinks back to the study, where Mabel sat in front of the roaring fireplace waiting for him. She gently licked her lips as Dipper handed her the cocktail and sat down beside her, feeling the pleasant warmth of the fire slowly envelop him as he made himself comfortable.

"Cheers," Dipper offered, raising his glass.

"Cheers," Mabel replied, clinking her glass against his. She giggled again. The light, girlish sound brought a youthful grin to Dipper's face. They had developed their own unique bond over time- more than that of siblings, a bond between two people who had shared their entire lives together. They had no secrets between them; and why should they? They talked openly about everything - their dreams, their desires, their darkest fantasies. And dark they were.; as discovered when the twins were younger, they found an odd pleasure in the misfortunes of others, whether it be watching lions devour a zebra on the nature shows, or when their nanny fell down the stairs in front of them. They had laughed as she bled, and weakly cried and pleaded for help, and had simply walked away to take a nap curled up in each other's embrace. They didn't even wake up when their mother had screamed as she returned home, as the ambulance flew down the street to the front of their house, sirens wailing, as the police arrived to take statements and move the body. Eventually, a friendly officer gently shook them awake to ask if they knew what happened. Dipper had simply glanced at Mabel, and told the officer in a flat tone, "She was always clumsy." They both started laughing, and the officer had slowly inched backwards towards the door. Shortly after the incident, their parents had sent them to live with their great-uncle Stanford Pines in the small town of Gravity Falls to see if the small mountain community would clear their heads, and there they had remained ever since.

"So, we have two of the journals now. Do we have any leads on who might hold the last?" Dipper asked, curious.

"Well, logic dictates that it might be that disgustingly friendly girl, Pacifica Northwest. Her great-great-great something or other was the founder of Gravity Falls or some nonsense, and judging by the tests we've had run, the journals are around a century old. The timeline fits, I suppose."

Dipper swirled his glass again before finishing his drink. "Good work. Do you want to take care of this, or should I?"

"Why sweet Dipper, haven't you already had your fun for today?" Mabel sipped at her gin and tonic, her cheeks blushing slightly. "Aren't you ever satisfied?"

"Not quite." Casually, Dipper set down his glass next to him, dusted off his jacket, bent over, and kissed his sister square on the lips. She shuddered with excitement. They had been down this road before many times, but it still filled Mabel with a strange sort of electricity, as if the two were magnets, and the closer they got the more energy they released. Mabel tossed her empty drink glass aside and roughly pulled Dipper to the floor in front of the fireplace.

"Why dear sister, I do believe this is what you had in mind all along for the evening," Dipper stated rhetorically, a hint of a smile edging onto his face. He had seen the look of basal hunger in her eyes the second he had returned; the evening's events were already laid out the second the returned with his urges quenched temporarily, but her own needs left unfulfilled.

"Be quiet," Mabel asked in reply, blushing slightly as she leaned in close to her brother's face. They stared at each other, each looking deep into the other's rich green eyes, breathing softly, waiting to see who would make the first move, a standard game of sorts between them.

"Oh, to hell with this," Mabel said, panting. "DO SOMETHING. Don't… you can't just stop here." Her cheeks reddened again - her twin was the only one who could fluster her like this, and he knew it. Dipper chuckled, slowly reaching up and slipping his sister's jacket off onto the floor, the teal color now contrasting nicely with the multi-bear skin rug laying in front of the fire. Mabel scoffed in response to his gentleness, making a show to rip off his shirt. As she did so, one of the buttons popped off and hit her in the forehead, causing Dipper to laugh momentarily, until Mabel gave him a scowl and slapped him across the face. He winced, but leaned in and gave her a kiss. Hungrily, Mabel pulled him closer, slipping her tongue into his mouth as she positioned herself on top of Dipper's lap. Slowly, she began moving her hips back and forth until she felt a familiar bulge stir beneath her.

Mabel bent down and unbuckled her brother's trousers, pulling them down past his ankles. She could see the outline of his cock through his briefs, and grinned evilly. She traced her finger around it lightly, and watched it twitch, drawing it out. Slowly, she began stroking her brother's manhood, feeling it stiffen even more in her hand. She increased her speed, skillfully moving up and down his shaft until she could feel him begin to shake.

"M-Mabel, I t-think…"

"Oh no you don't, dear brother. Not yet." She stopped, enjoying the look of abject misery on Dipper's face as she drew her hand away from his rod, winking. "Now it's your turn," she said in a singsong tone, slipping her shirt off over her head, and removing her skirt. She tossed them on top of their other clothes, and turned back to Dipper, shoving him backwards roughly.

Dipper gave a purposefully exasperated sigh before bending down. Carefully, he removed Mabel's panties (black lace, presents he had given her the month before) and slid his tongue into her wetness. He never minded this, really, there was something intoxicating about the intimate taste of his sister. His protests to this duty were almost entirely for show, as he didn't want Mabel to know just how often she had the upper hand in their relationship.

He glanced up briefly, pleased to see the pleasure radiating from her expression. Grinning slightly, he resumed his assault, deftly maneuvering his tongue around her entrance, savoring the illicit flavor. Mabel shuddered and bucked her hips as she came, and Dipper grinned again. It pleased him to know he still knew how to find her weak spots, and how easy it was to push her buttons. And now, it was his turn.

Slipping out of his silk boxers, Dipper stood erect before his naked, panting sister. She glanced up to see his manhood standing before her.

"Oh god, it's bigger than I remember." Mabel said breathlessly.

Dipper thrust himself into her aggressively, bringing his head next to hers and whispering in her ear, "God can't hear you now." Dipper found a good rhythm, plunging himself over and over into her, watching her writhe in pleasure under him. He continued, mind going blank as his carnal instincts took control of his motor functions. She kissed his neck, roughly and repeatedly, almost sucking on his very flesh. In return, without breaking pace, he bent down and gently bit on her perky bosom, before slowly rolling his tongue around her nipple. Mabel moaned heavily, and Dipper could feel her clamping down around his member. Suddenly, Mabel's eyes began glowing bright blue as they began floating upwards into the air.

The twins had each received a magic amulet from their great-uncle on their 16th birthday, Mabel choosing the teal necklace of opal, leaving Dipper the crimson bolo of ruby. Through practice, the twins eventually unlocked the secrets held by the heirlooms, working together late into the night and always falling asleep exhausted and sweaty. By combining their powers and themselves, they had felt the power increase as their bond grew stronger. When they were together, they didn't even need the stones to channel their powers.

Now, as they lay entwined and sweaty suspended in the air, Dipper could feel himself coming close to the brink as he thrust into his sister. His eyes shone red and his face hardened as he quickened his pace. Fire began to swirl around them from the fireplace, dancing in circles before forming into the shape of an intricate dragon. Shortly after, a shock shot through them as they both passed their limits, Mabel screaming, Dipper groaning, and the dragon exhaling fire into the air above them, singing the chandelier. Mabel lowered them gently back onto the ground as Dipper directed the dragon of flames back into the fireplace, watching it melt away into the rest of the inferno. As they touched down again, Dipper brushed the hair out of Mabel's eyes and gave her a lingering kiss on the lips.

"Simply fantastic, dear sister. Why, you almost made the experience enjoyable-" Dipper was cut off by another slap to the face, as Mabel pulled him underneath her. She kissed him again, deeply and passionately.

"Can't you just be quiet for once, sweet brother? For heaven's sake, just let me enjoy this," Mabel said, dragging her finger across his toned chest, dripping with sweat. "Let us enjoy this brief respite together before we must go out and deal with this book situation."

"About that," Dipper posed, "I believe I have a solution to this whole ordeal. But not yet. If you so insist, let us lay together for some time. I do enjoy your warmth." Lazily, he traced the shape of a falcon from the fire with his finger, watching it soar above their naked forms as Mabel held him close.