Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/5601328.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Gravity_Falls
  Relationship:
      Bill_Cipher/Dipper_Pines
  Character:
      Bill_Cipher, Dipper_Pines
  Additional Tags:
      PWP, I_am_a_sinner, basically_Bill's_an_ass_and_Dipper_deals_with_it_and
      they're_both_horny_fucks, bottom!dipper, Dipper's_like_sixteen_in_this,
      I'm_BillDip_trash, why_did_I_write_this, Human!Bill, i_mean_he's_still_a
      demon_but_he's_got_a_human_body, Dipper's_secretly_a_huge_slut_but_that's
      ok, we_all_have_a_bit_of_slut_inside_us, sorta_noncon_bc_Bill_pretty_much
      blackmailed_Dipper_into_having_sex
  Stats:
      Published: 2016-01-03 Words: 2599
****** God's not into Voyeurism ******
by WizbangBonanza
Summary
     It's not easy to have sex with a dream demon while your sister's
     asleep on the other side of the room, but Dipper manages.
Notes
See the end of the work for notes
Dipper had felt eyes on him all day even more so than usual.
As he swept the floor of the shack, as he went out into the forest to learn
about his newest curiosity, as he helped with Grunkle Stan’s inane chores. The
eyes burned even more onto him when he talked to Wendy or when he was in the
shower. 
 It was weird and he had talked to Mabel about it before they went to bed.
“It’s probably your secret admirer or something.” She wiggled her fingers with
mystery. Even at sixteen, she never lost her special childlike personality.
“Don’t be stupid, Mabel. What if it’s something dangerous or something?” He
fearfully divulged to her.
“Don’t be such a worrywart, Dipper. Nothing wants to kill you that badly.” She
booped his nose before saying goodnight.  
Despite his sister’s assurances, Dipper couldn’t help but worry even as he
closed his eyes and drifted-
A hand clamped over his mouth and a “shhhhh” sounded in his ears. Opening his
eyes he saw a blond haired man with an eyepatch.
What?
“Who-?”
“Don’t recognize me, Pine Tree?” That familiar voice…
“BILL?!” The former triangle grinned.
“Bingo. Someone give the meat sack a prize.” Dipper glared at him.
“What do you want, Bill? Was it you who was watching me all day? What-“
“Shhhh. Not even a hello? Yeesh, kid, and I thought your species loved
etiquette or whatever. Yeah, I was just minding my own business when you just
so happened to CATCH MY EYE.” Dipper flinched as the other’s voice turned
otherworldly, circling around him. “I’ve just been watching you and, wow, you
really grew kid! Those noodle-y arms even got a bit of muscle!” Dipper
blushed. 
“Oh really? Actually I- HEY! No, you answer the question. What do you want?!”
Bill laughed.
“That’s easy, I want you.”Dipper stared at him confused.
“What?” Bill rolled his eyes.
“I like you, kid. Like I really like you.” Dipper remained confused until he
suddenly blushed a dark red.
“Oh.” He lamely replied.
“Yeah. I made this body just for you. I mean could I get any sexier?!” He
wiggled his eyebrows and Dipper was suddenly made aware of his flawless dark
skin, his wild golden locks, and his face.
Oh no.
Dear God, if you’re there please end my existence.
“Hey, I don’t wanna hear his name, he just ruins the mood. Besides, we’re going
to be doing some pretty sinful stuff, and I don’t think he’s into the whole
voyeurism kink.” The demon wiggled his eyebrows as Dipper glared indignantly.
 “Hey! I never agreed to this.” Bill looked unimpressed.
“Won’t you? I could just kill your entire family and steal the book. Or I could
possess you again and slowly torture your family to their graves like Gideon
does to his.” Dipper looked at him in fear.
“You wouldn’t. We’d just stop you again.”
“I wouldn’t? I’m a demon aren’t I? Annnddd I know how the human body works now.
I’ve done my research.” He gestured to his own vessel with a beaming smile.
“Well-“ Dipper bit his lip.
“And don’t tell me you’re not aroused too,” He stared pointedly at Dipper’s
crotch and Dipper yelped indignantly.
“STOP THAT, I-“ Bill embraced Dipper, settling his lips over Dipper’s ear.
“Shhhh, wouldn’t want to wake shooting star…” Dipper’s eyes fearfully darted to
his sleeping sister before turning back to the sinister smirk.
“So? Do we have a deal?”
Hesitantly, Dipper leaned forward and Bill wasted no opportunity. He caught his
mouth in a ferocious kiss, lips still in that godawful smirk.  Brushing his
hands on Dipper’s erect nipples, he tried desperately not to moan as Bill’s
hand wandered farther down. He felt a strange tingling feeling down there.
As he saw what Bill was doing, Dipper furiously glared at him, his face a
raging red. The demon only grinned wider as he suddenly clutched at his crotch.
“-argh.” He held a muffled groan at bay in his throat.  Since when did his
breathing become so labored?
That damned demon.
A sudden wave of pleasure made him have to hold back another moan. Was that
what he thought it was? Panting, he glared down at Bill who had suddenly sucked
the clothed bulge.
“I heard that, Pine Tree.” a warning voice echoed in his head. Bill’s stern
face suddenly morphed into a mischievous grin as he pushed down his boxers and,
without warning, enveloped the twitching cock with his mouth. 
“F-fuck” Dipper breathed out in shudders. Clutching at his sheets, he glanced
down at Bill who coolly met his gaze. Gasping he tried to be quiet but little
mewls escaped his lips. Dipper swore he would’ve been grinning if not for the
dick in his mouth.
Dipper’s dick. 
OhGod. This was actually happening.
Dipper had never had this kind of experience before. He’d only ever dated girls
who’d made him too flustered to even hold hands much less suck his dick.
Something foreign pushed up his chest and played with his head. A headache that
both alleviated his anxiety and made his brain throb, effectively making him
lose the sense to stop, the sense to push Bill off the bed, the sense to keep
quiet as he was lost in Bill’s ministrations.
 And it felt good.
 Bill's wet tongue swirled around the tip a bit before running along his cock.
A raging pleasure coursed through Dipper’s veins while the wet hotness
continued to surround his dick. Bill let his teeth graze the skin just a bit
before hollowing his cheeks. Dipper was in a state of utter bliss.
He tried not to pull at Bill’s soft locks as his feet was pushed into the
mattress while trying to find ground. Bill just adored his Pine Tree.
He suddenly hummed and Dipper tilted his face back in a loud groan as he came
into the demon’s mouth.
Dipper was still shuddering moments later as Bill released his dick with a loud
wet pop. He climbed over Dipper’s pale chest to give him a long, sloppy kiss
and Dipper immediately melted into it, having little brain power to do anything
else. Saliva dripped from his lips as they parted. 
They both lazily glanced at Mabel, who had, despite Dipper’s inability to keep
quiet, only turned to the other side of her bed, muttering something about her
dream boys.
 “Well, someone’s a heavy sleeper! I’ll just have to take note of that later,
won’t I?” Bill chuckled. Despite his malicious implication, Dipper only closed
his eyes and turned his head back, trying to catch his breath.
 “But enough of that. It’s time for the really fun stuff to begin.” His eyes
snapped open. 
“Wha-“ Dipper could only feel his anxiousness as Bill latched onto his lips and
he couldn’t help but melt into it.
 He could feel himself getting hard again, as Bill’s tongue worked its way
around his mouth. A needy moan let itself out.
“Puh- please more” His voice felt so far away as blood pounded in his ears. The
headache was back and only encouraged his aching cock.
“Anything for you, Pine tree. Now on your knees.” The command sent shivers down
Dipper’s and his cock twitched in response. Bill’s grin was absolutely evil and
Dipper would, of course, never admit that it turned him on.
Bill separated for a long moment as Dipper followed his command. Apprehension
settled itself in his chest, and Dipper feared that he had left to never come
back. In that instant, he felt a warm feeling in his chest and a soothing
voice.
“Shhh, of course I’d never leave you, Pine Tree. Relax. I just needed to get
something to make your first time with me even more enjoyable.”Bill cooed in
his head, and Dipper sighed in relief as he felt the bed dip down again. Wait,
what was that other feeling? Is that…wet? Dipper suddenly opened his eyes and
arched his head to look. A magnificent blush settled itself on his cheeks.
Bill’s pants were gone and in its place was his own hard throbbing dick which
had to be at least two times the size of Dipper’s. A smug smirk settled on his
face as he saw Dipper’s red face.
He slapped Dipper on his pert ass, and a yelp made the teen face front. Another
sudden hard slap a moment later made his cheeks sting and Dipper whimpered.
Huge tears of precum streamed down his dick.
A final slap, harder than the others, made tears form in Dipper’s eyes and a
loud moan pushed its way out of his throat. Lips whispered in the cup of his
ear.
 “Isn’t pain hilarious?” Dipper shivered and nodded. Laughing softly, Bill
pulled away to grope Dipper’s ass and stretch it out, lining his dick with
Dipper’s pink twitching hole.
He played around, ghosting his tip right at the entrance earning an annoyed
grunt from the teen. He wiggled his ass to at least get some kind of semblance
of satisfaction.
“Bill, stop teasing and-FUCK.” Bill laughed lowly as he suddenly thrust into
Dipper’s hole.
“Ah, what was that, Pine Tree? You need me to what?” Dipper could’ve said many
things. He could’ve told him he was an asshole and he needed to move so that he
could be effectively pounded into the bed. Then he could come and then forget
Bill had ever come to his room. He wanted to tell him these things but he could
do little else but cry out and shudder, violently clutching the bedsheets.
Moments of silence passed and Bill got concerned.
“Pine Tre-?” A cold voice penetrated the tense air despite his trembling lips.
“Move.” Dipper glared at him still with tears in his eyes. A wave of arousal
shot through Bill’s body at the firmness of the command.
“Y-yeah, sure.” he lamely agreed as he slammed into Dipper again and kept a
steady rhythm. Dipper’s face lost all trace of previous control as he moaned
and pushed back into Bill’s dick.  Two sets of loud heavy breathing pushed all
other sound from the room. Skin slapped skin as Bill’s dick met Dipper’s
insides. They went on like that for a while until Bill said something.
“Wait.” He flipped Dipper so that he straddled Bill’s waist. Incredulously,
Dipper stared at Bill with a you-can’t-possibly-be-serious look.
“Try me. Now chop chop, unless you rather have me change my mind and leave.”
Dipper grit his teeth in determination and growled as he sunk down. He let out
a deep moan as Bill’s cock went even deeper in his ass. Holding his shoulders,
Dipper met Bill’s lips in another sloppy wet kiss as the sound of sex filled
the room. Dipper opened his eyes, meeting Bill’s and he blushed even redder. He
looked away embarrassed but didn’t stop slamming himself down on his dick, soon
losing his shame and closing his eyes as he was swept away in the pleasure once
again. 
“Beautiful” Hissed Bill and he bit into Dipper’s shoulder, sucking the skin
there while he scratched his sides. 
“Bill!” Dipper desperately moaned, too lost in his own desires to care about
what his enemy thought of it or even that he was fucking a triangle. He arched
his back tilting his head, as tears of lust built up in his eyes.
A feral gleam in Bill’s eyes formed as he growled and forced Dipper on his
back, taking control again. Scratching into Dipper’s back, Dipper moaned again,
the line of pain and pleasure blurring. Nails clutched his arms back behind his
head. The demon pounded his ass into the mattress as Dipper panted his name
again and again. 
“I really fucking love it when you say my name like that, Pine Tree.” He
snarled into his ear. “Panting like a little slut. Don’t you love it when I
slam into your tight ass as you scream my name over and over? You naughty boy,
letting a demon fuck you like this, especially with your darling sister right
next to your bed. You’re not getting into heaven after this little escapade,
hmm? I’ll treat you like a prince in hell and we’ll fuck every single second
we’re there. Do you hear me you little slut?”
“Y-yes.” He nodded fervently.
“I’ll haunt your dreams, Dipper. Every night I’ll go into your dreams and fuck
you senseless so that everyday you’ll think of me, and only me. Not Red. Not
your family. Not your sister. Me.”
“Yes, yes, yes.” They were fucking like animals now. Bill furiously pounding
his prostate without pause as Dipper kept on repeating his mantra.
“You’ll belong to me alone. Is that clear. You’ll be my little slut for all
eternity, for all of forever and everything that comes after. Every little bit
of you. Your body, your heart, your soul. All of it. Mine. Mine mine
mine.You’re all mine. ”
“YES, YES, YOURS, ALL YOURS. ALL OF IT. YOURS.” Dipper sobbed. He was so close.
One more push and he’d probably die.
“Look at me.” Since when did he close his eyes? Dipper met the command without
hesitance and met the look on Bill’s face. He was just as close as he was, face
red with arousal and he struggled for control as pleasure overtook him.   
Dipper absolutely loved it and that’s all he needed to become undone.
“BILL!” He screamed out and groaned as Bill filled his ass with sperm. 
They stayed like that for a while catching their breath before Bill finally
pulled out, his cum spilling out of Dipper’s ass and onto the bedsheets. He met
Dipper’s lips for another long kiss before he flopped back beside Dipper,
holding him. Catching their breaths, they lazily lay there for a long while,
before Bill kissed his forehead and sat up.
“Well, that was fun.” he grabbed his pants and underwear, fixing himself up
until he looked as impeccable as before. 
“Yeah. But, I still don’t understand.” Dipper gathered his thoughts, shaking
the haze from sex away from his head.
“Yes, my sweet dear Pine Tree?”
“Why didn’t Mabel wake up?” Dipper looked over at his still sleeping sister,
who was gone? Wait. When did the world turn gray-
“Uh oh, gotta run, Pine Tree.” Dipper remained shocked for another second
before angrily screaming at the floating man.
“BILL!” The dream demon only laughed.
“I’ll see you later kid, but we’ll be sure to do this again some time. You are
mine for all eternity now, right?” He purred.
A tattoo of a triangle appeared on his chest where his heart was and Dipper
yelped.
“BILL?!”
“HAHA, you’re hilarious, Pine Tree. That’s why I love ya! See you in your wet
dreams~
Now, wake up.”
 
“Bill!” Dipper sat up in his bed.
“Pssh, dreaming of your boyfriend, brother?” Mabel laughed already awake in her
own bed, knitting what seemed to be a sparkly hat with pig ears?
“Wha-NO!” Mabel grinned.
“You were making gross boy noises in your sleep. Looks like Wendy’s got some
competition! AHAHAHA.” She put down her knitting and went downstairs to get
breakfast.
“NO, MABEL, UGH. He tripped on his covers, onto the floor. Stumbling onto his
feet again, he cracked his back.
“Ughh, everything hurts. Wait a minute.” He looked into the mirror again. The
bite marks were still on his neck and he was sure the scratch marks on his back
were still there as well.
“BILLLLLLL!” And somewhere in the void a certain triangle laughed to himself as
a boy went to go hide his hickey before breakfast.
End Notes
     It's the anniversary of when I started this profile and I decided to
     make a porn fic.
     lmao so that's it, proof of me being a sinner. pls don't let my mom
     find this, she'd probably exorcise me from my home haha *flashes a
     frozen smile and fearful eyes*
     This was my first porn fic and oh boy was it one heck of a ride. It's
     really hard to write some serious porn without laughing or scolding
     yourself on how ur gonna earn urself a VIP seat in hell but idk I had
     fun :^) And ik I posted this as a oneshot without plot, but if people
     are interested maybe I'll post a sequel or something idk
     ¯\_(ツ)_/¯
     As always, I welcome any comments and kudos are precious to me. You
     guys are my motivation and idk you're all great... probably.
     I hope you all have a happy New Years and hey, thanks.
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
their work!