Full chapter name: Put the Triangle in the Triangular-Shaped Hole

don't test me I can make even stupider chapter titles you dont want to mess with me

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Dipper dragged his tongue across his bottom lip, just adding to the saliva dripping off his chin as he rocked his hips up into his own hand.

His trig book, propped up against the wall, stared back at him. Its pages were wrinkled from the amount of sloppy kisses he had given it over time, and yet the black shapes still were as straight and as clear as can be. Each were teasing him, tantalizing him with their perfection, and Dipper found himself already so, so beyond close to finishing.

"Heya Pine Tree! You busy?"

Dipper screamed, nearly falling out of the chair of his desk. He let go of himself, slamming his hands hard against the face of his desk.

"What the fuck?" Was all Dipper's response was. His hands pawed at himself, stuffing his cock back into his pants. He winced, his eyes watering at his own rough treatment of himself, but didn't let that fact deter him from glaring at Bill.

"Again? Really?" Dipper complained, sinking back into his chair. "At this point, I'm just annoyed. That's it. You're never gonna listen to me, are you?"

Bill snorted, rolling his eye. "When did I ever listen to you in the first point?" He replied. He shot Dipper's trig book again and flew over to it, closing it and slamming it onto the desk. He hovered over it, as if he were sitting on it, and stared hard at Dipper, as if daring him to try and move him.

Dipper rolled his own eyes and sat back in his chair. "Is your plan to just keep me from masturbating or- or annoy me till I agree to fuck you or something?"

Bill chortled at that, his form brightening. He stared hard at Dipper, who was looking up at the ceiling.

"Something like that. Maybe~" He sung.

Dipper glanced over at Bill, his flush deepened, and he glanced away. "And you're not gonna leave me alone till we fuck, are you?" He continued.

"Mmm nope!" Bill laughed.

Dipper groaned loudly and leaned his elbows on his knees, putting his head in his sticky hands. He tugged at his own hair, breathing in deeply before sighing out of his nostrils. He straightened back up and this time, stared hard at Bill, ignoring his own hot and flushed face.

Dipper grimaced. How was he still so painfully hard?

Bill snickered at his expression, slipping off his book and scooting closer, eye heavy-lidded. "Well, Pine Tree? What do you say?"

Dipper stared hard at Bill. Equilateral triangle. Flat- only a few inches thick at most. His points were sharp and prominent. Dipper rolled his shoulders back.

"If I agree to your stupid demand, will you leave me alone?" He finally asked.

Bill's eye squinted up into what Dipper knew to be his own version of a shit-eating grin. "If you want me to," He said coolly, rubbing his hands together.

Dipper groaned and ran his fingers through his hair, staring down at his obvious hard-on through his pants. "Fine," He said. He could barely understand his own voice saying such strange words he had never thought he would ever actually utter. "Fine! I'll fucking sleep with you, this one time. But you better leave me alone afterward, got it?"

Bill guffawed, pressing his small hands against his front and floating up a little into the air. "Fine! We can even make a deal-" Bill held out his hand, flickering blue flames consuming his small black fingers.

Dipper stared hard at the flames, up at Bill, then back down at the proffered hand. "Okay. Deal," He stated firmly, then reached out and shook Bill's hand.

Dipper moved to let go of Bill's hand and pull back, but Bill grabbed his wrist, letting himself get pulled along with Dipper and landed in his lap.

Dipper hissed at the sudden, but light pressure against his cock. His eyes were as wide as saucers as he stared down at Bill in shock.

Bill was a little heavier than he had expected, as well as warmer. His heat was already bleeding through Dipper's thin clothes and Dipper had to bite back a small hiss at the sensation.

"Glad you finally came to your senses!" Bill chirped happily.

Dipper sighed slowly through his nose. "I'm going to regret this, aren't I?" He said to himself.

"Probably," Bill answered anyways.

Dipper huffed through his mouth and gave the triangle a look, who was still staring up at him. "Well?" Dipper bit out after a few more awkward beats.

"Well what? I'm waiting on you!" Bill cried out, flailing his arms about.

Dipper grabbed Bill's wrists none too gently in a single fist. "Okay, first of all, if this is gonna work you are gonna have to do what I say. Can you do that?"

Bill grumbled loudly, his form reddening.

"Bill…" Dipper said in a warning.

Bill snorted and Dipper swore the triangular demon was pouting. "Fine! But don't think I take orders, Pines."

Dipper blinked slowly. Okay…" He trailed off awkwardly. He dropped Bill's arms. "First of all, don't flail your arms around."

"Say the magic word and I won't."

Dipper refrained from rolling his eyes again. "Please?"

"Not even close but I'm feelin' nice so I'll accept that."

Dipper gave another deep, long sigh. He stared at Bill again, cocking his head to the side.

"Well?" Bill asked after a few seconds. He wiggled in Dipper's lap, grinding down on him on accident.

"Oh- fuck- I've never done this with another, well… sentient being!" Dipper snapped. "You know… fuck this."

Dipper grabbed Bill's sides harshly and picked him up a little, kissing him hard below his bow-tie.

Bill made a small sound of surprise, eye widening. He looked down at Dipper, whose shoulders had relaxed. He opened his mouth a little, licking across Bill's form, and moaned softly.

Bill found himself tangling his fingers in Dipper's hair, keeping him in place, staring down at him undisturbed with intrigue. He held his thoughts inside him, not wanting Dipper to stop to snap at him. Dipper's back slowly lost its tension as well and Bill found himself moving his hands from his head, lengthening his arms to instead stroke his hands down Dipper's back. He moved his warm palms over Dipper's spine and shoulder blades. He pressed the both of his palms where Dipper's heart was, feeling it beat hard and fast for a few moments.

"Ah~?" Bill found himself gasping as Dipper started to run his own hands down his sides. Bill jerked again, a louder and higher-pitched sound of pleasure escaping him when he felt Dipper pinch his bottom points. "P-Pine Tree!"

Dipper ran his tongue across the front of Bill's bricks again before jerking back at Bill's cry. he looked at the demon, a single eyebrow raised in curiosity. Was that… a look of shock gracing the demon's front?

"What? What's wrong?" Dipper asked. His voice was husky. "You want to stop?"

Bill scowled the best he could, slapping Dipper across the head. "Of course not! Continue with your weird licking ritual!"

Dipper didn't respond to that. "If you shut up, I will."

Bill pouted and pressed close to Dipper. Dipper, when Bill didn't say anything, bent back down to continue kissing his front hard.

Bill shuddered, another soft noise escaping him when Dipper's hands returned to running up and down his sides. His thumbs traced the bricks on his front while his middle fingers followed the same motions on his back. Bill felt as if his entire form was melting oh so slowly, a strange heat building up in his small form. His eye fell closed, small patterns of colors playing behind his eyelid.

Dipper grunted and tugged Bill lower. "Rub against me," Dipper gasped against Bill's bricks.

"S-say th-the m-magic w-word," Bill panted softly, unable to level his own voice out.

"F-fuck you."

"That's it!" Bill started to lower his body.

"Wait," Dipper said. Bill hissed when one of his hands left his body to instead free himself again.

A small, interested ah escaped Bill as he felt something hard, moist, hot, and just plain fleshy press against him and between his legs, as if searching for something. Bill shuddered, not entirely sure what he was supposed to be feeling.

The demon glanced back down at Dipper, who was back to slobbering all over his front. Dipper seemed to be enjoying himself.

Bill relaxed into Dipper's grip on him again, focusing more on the hands which were back to moving up and down on his sides, tracing his bricks and once in a while, pinching his sides. Bill smirked to himself hearing incomprehensible chatter spill from Dipper's lips against him, surely praising him.

Bill couldn't imagine what else he would be saying, in any case.

Dipper's cock smeared more precum against Bill's lower side. Bill tried to focus more on the sensation of something so hard pressing against his side instead of the sticky, gross feeling coming with it. Closing his eye, another more breathless noise escaped Bill. The heat inside him seemed to be building even more.

Blue sparks teased the air around Bill.

Bill felt as if he were about to explode and when Dipper pressed up into him hard, moaning loudly against his body, both hands moving to pinch Bill's points for the last time, Bill did.

Bill screamed loudly as his eye flung open, flames spewing forth. His entire form shuddered and flashed- gold, blue, black, and white.

Dipper screeched in alarm, yanking away and shoving the triangle away from him. He hissed as the flesh on his palms bubbled and burned. He held his hands out, tears springing to his eyes. Despite this, Dipper found himself coming weakly, a few strings of cum spurting towards Bill, missing the demon entirely.

Bill sunk onto Dipper's desk, fire still curling around him but dissipating into the air. He panted hard, his eyes blinking blearily. His hands pressed flat against the desk, holding himself up

Bill blinked rapidly, the flash of white that had swallowed his vision fading.

"What the fuck," Dipper gasped. He tucked himself back into his pants again. He lapped at his chapped lips. "What the fuck was that?"

Bill blinked slowly, struggling to coordinate his spinning thoughts. "How- how am I supposed to know? I've never done th-that before!" Bill slowly started floating in the air again, shaking himself. His golden glow, which was weak, flickered but stay true. "Wow does- does it always feel- feel like that?"

Dipper grumbled himself, his face screwing up. "No, not really."

Bill stared down at his hands. "I- I wanna do that again!"

"Hey! We had a deal! That was it," Dipper snapped.

"So? Let's make another one! C'mon, Pine Tree!"

"You almost killed me!"

"You say that like it's something new."

Dipper scowled and glared at Bill, crossing his arms tight across his chest. "No. Way," He enunciated.

"Oh, but come on! You enjoyed yourself~ I know you did! Besides-" Bill snapped his fingers, causing Dipper's trig book to catch fire. "-what other choice do you have?"

"Bill! No!" Dipper screamed, launching himself forwards at the triangle. Bill dodged Dipper's flailing fists, which slammed down hard on his desk.

It was too late, however. His book was nothing more than charred ashes.

"Fuck! Fucking-!"

"Well?" Bill said smoothly, sidling up next to Dipper, who was hanging his head. "I know you were enjoying it up till… well… anyways, you should really stop lying to me, Dipper Pines."

Dipper flinched and stared up at Bill, who was grinning down at him. "Besides," The demon started again. "That dirty ol' book wasn't really satisfying you, was it? C'mon, you don't have to play coy with me anymore, my prickly friend. I KNOW." Bill's eye flashed blue.

Dipper didn't stumble away from the demon, didn't even flinch. He continued to stare up at Bill with the same look he had before- a little anger, a little annoyance, more frustration, all veiled thinly with a layer of nothing but pure lust.

"…Fine," Dipper finally said after a few beats. "Saturday. When Mabel is gone again. Be here after dinner exactly at 8:30. No earlier, no later!" He turned away quickly, cursing himself.

Bill chuckled and ruffled Dipper's hair, making him scowl. "Glad to see you're finally thinking with this head, more or less. Probably less." Bill offered another flaming hand at Dipper. "Deal."

Dipper shook Bill's hand quickly before pushing the triangle away from him. "Just get out of here."

With another sleazy laugh and a wink, Bill was gone and Dipper found himself back in his chair, picking his head up and opening his eyes to a colorful world.

His trig book was still nothing but char.

Dipper hung his head in his hands, groaning loudly. "What the fuck have I just done?"

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Wow they finally had sex

how many of you were thinking I would give Bill a triangle vag or smth? Nah man. He is a triangle he would not have that.

Anyways this is actually a lot worse morally than I had been expecting it to be but them's the brakes.

Plus I mean. If you're taking this story seriously... why...

anyways, thank you for reading! Comment if you enjoyed~