Ao3 Version

(Disclaimer: This is a part of my Trustworthy AU)

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Mabel gave
herself a last look-over in the mirror before leaving; the flannel shirt and
the boots she had borrowed for Wendy fit perfectly. She picked up the plastic
axe and posed with, letting out a small giggle at the sight before leaving.

It was Halloween,
and only a little more than a month since Dipper and Bill had gotten married.
It was also a little more than month since she and Dipper became demons. There
were still some powers she didn’t have complete control over, mostly she had a
tendency to levitate whenever she got excited like now, but Bill thought both
twins had made a lot of progress in just one month.

But anyway,
Halloween! One of the positive things that Bill had brought to her and Dipper’s
lives were the insistence that they all wore costumes and went
trick-and-treating together. Mabel had been scared that, that Summerween in
2015 had been their last round of trick-and-treating, but Bill loved the idea! And
since Mabel and Bill, the two people Dipper loved the most in the world, both
wanted to keep trick-and-treating, well, Dipper went along with it.

Not that
they got any weird looks for it; there were plenty of adults in Gravity Falls
who went out trick-and-treating, including Sheriff Blubs and Deputy Durland.
One person, who had never gone trick-and-treating to Mabel’s shock and surprise,
was Pacifica. Her parents didn’t like the idea of dressing up in silly or scary
costumes, and who would go around and beg for candy, when you have enough money
to buy an entire candy store? After hearing that, Mabel had insisted that
Pacifica joined their group.

After a
short walk through town, Mabel showed up at the spot where the four of them had
decided to meet. Their group used to include Soos, Candy, and Grenda, but Candy
and Grenda had moved out of Gravity Falls a couple of years back, and Soos was
busy keeping the Mystery Shack tradition of scaring kids alive… well, to a
point. He was definitely more benign than Stan; this year’s Summerween had
included an exhibit based on the Summerween Trickster, where Soos would have a
statue made of loser candy out in front of the Shack, and kids were encouraged
to eat the monster before it ate them. Most kids just left, not wanting to eat
loser candy.

It didn’t
take long before Dipper and Bill arrived together, both wearing the costumes
the three of them had decided on.

“Okay,
Dipper,” Mabel tried to hold back her laughter. “When we decided on a red
riding hood theme, I hadn’t thought those were the kind of costumes you would
go for.”

Dipper was
wearing a red hood and cloak, along with a white shirt with short poofy
sleeves, with a black corset over it, tight black pants, and brown boots that
reached his knees, carrying a basket instead of a plastic jack-o-lantern.

“We had to
make a compromise,” Dipper explained deadpanned.

“I thought
he should wear a miniskirt,” Bill shrugged. He was wearing a wolf costume that
included ripped jeans with a wolf tail attached, wolf-paw gloves, a wolf-ear
headband, and a band t-shirt that looked like it had just been chosen at
random.

“Well, that
doesn’t explain Bill’s costume; he usually goes all out,” Mabel added.

“No,”
Dipper stepped closer to her and looked into her eyes. Something in his gaze
made it clear that whatever he was about to say, he was 100% serious. “We
had to make a compromise.”

“I still
don’t get why I couldn’t-“ Bill was quickly interrupted by Dipper.

“You looked
like you’d just stepped out of a Red Riding Hood porno!” Dipper hissed, his
face almost as red as his hood.

“So we
compromised,” Bill finished with a smile, before reaching into his pocket and
pulling out a black collar with a leash attached to it. “But I’m still wearing
this~”

“Bill!”
Dipper shouted as his husband put on the collar and handed him the leash.
“People are gonna think we have that kind
of a relationship,” he added in a whisper.

“But we
do,” Bill argued with no attempt to lower his voice.

“Oh, my~”
Mabel giggled, unable to help herself anymore.

“Oh, like
you don’t do things like with Pacifica,” Dipper countered, causing Mabel to
blush herself and shutting her right up. “By the way, where is she?”

“I don’t
know,” Mabel scratched the back of her head and looked around. She didn’t know
what Pacifica would be dressed as, since she wasn’t onboard with their matching
costumes idea, but Mabel was pretty sure she could recognize her anyway. Seeing
no sign of her girlfriend, Mabel pulled out her phone; no messages, and she
should have been there by now.

“She’s
probably just running late and forgot to leave you a message,” Bill suggested.

“Yeah,”
Mabel nodded in agreement, since this wasn’t the first time it had happened;
usually it happened when her parents kept her late, lecturing her on how
unacceptable her behavior was getting, and knowing it would only make it worse,
she wouldn’t pull out her phone to send Mabel a message that she was going to
be late. “I’ll write and tell her we’ll make our way towards the manor and meet
her on the way.”

 

Mabel had
been ready to leave it at that, but as they walked, she couldn’t help this nagging
feeling that something was wrong. Her suspicions were confirmed when only ten
minutes later, her cell phone rang, and the caller ID said it was from
Pacifica’s phone.

“Hi, sweety,”
she greeted when she picked up her phone.

“Hello, is
this Mabel Pines?” a female voice responded.

“Yes…?”
Mabel answered slowly. “Who is this?”

“This is
Nurse Rand from Gravity Springs General Hospital,” the nurse continued. “Ms.
Northwest is currently admitted in one of our emergency wings. We have tried to
contact her parents, but have been unable to get a hold of them.”

“W-what
happened?” Mabel asked, while every form of fear and worry invaded her body.
“Why is she in the hospital?!”

“Ms.
Northwest seems to be a victim of a hit and run,” the nurse explained. “A young
man found her on the side of the road near the woods, and called for us. Ms.
Northwest seemed to be in critical condition at the time, but I am happy to say
that she is recovering. I was hoping you could relay the news to Mr. and Mrs.
Northwest, since we have been unable to get a hold of them.”

“I’ll be
there as soon as possible!” Mabel said before ending the call and turning to
Dipper and Bill, both of whom looked worried, having overheard the
conversation. “We need to get to the hospital, NOW.”

 

After
teleporting back to Mabel’s apartment and grabbing her car, the three of them
drove to the hospital. One of the perks of the twins technically only being
half-demons were that leaving the town didn’t have the same effect on them that
it had on Bill, so Mabel could stay by Pacifica’s side for the entire night if
it was necessary.

“Maybe we
shouldn’t have taken the car,” Bill suggested. He had the backseat to himself,
while Mabel was driving and Dipper sat beside her on the front seat.

“We’ll need
the car to drive Pacifica back home,” Mabel argued, throwing Bill a quick
glance before turning her focus back to the road.

“It’s a
shame our trick-and-treating was cut short, huh?” Dipper said, trying to
lighten the mood.

“I don’t
care about that now,” Mabel sighed in frustration.

It was
quiet for nearly ten minutes before Mabel spoke up again.

“I’ve been
having nightmares about this,” she said, her voice barely a whisper. “Dreaming
that I would… lose Pacifica…”

“For how
long?” Dipper asked, giving his sister a worried look.

“About a
week after we became demons. I think it sunk in that… unless Pacifica goes
through the same ritual, I’m going to lose her, one way or another…”

“Llama
Wool’s not gonna die from this!” Bill assured the two, sounding way more laid
back and relaxed than the other two. “She’s tougher than this; her soul symbol
is based on nature’s greatest warrior!”

“I’m not
just talking about car crashes and things like that,” Mabel sounded like she
was about to cry. “If she doesn’t go through the ritual, she’ll eventually die
of old age… She’ll die, and I won’t be able to prevent it.”

“We… we can
recreate the ritual, right, Bill?” Dipper asked cautiously, afraid of how Mabel
would react if the answer was no.

“Of
course!” Bill almost scoffed. “It’s probably gonna be even easier to collect
ingredients this time around, now that paranormal creatures are out in the
open.”

And with
that, the conversation ended. Mabel felt a little better now, knowing that
Pacifica would have the option of turning into a demon too. Unless, of course,
Pacifica chose not to become a demon. If Pacifica chose that, Mabel was sure
her heart would break, but she wasn’t going to force Pacifica into it.

After
arriving at the hospital, the group met up with Nurse Rand and told her that
Pacifica’s parents couldn’t come because they were out of town; a small white
lie, but none of them wanted to explain Pacifica’s rather complicated
relationship with her parents.

“The young
man who found Ms. Northwest is still with her,” Nurse Rand explained while
leading them to Pacifica’s room. “I’ll return shortly with the doctor, and then
she can give you the details.”

Mabel
watched the nurse leave before opening the door. The first thing she saw was
Pacifica, lying unconscious on the hospital bed, skin naturally pale. Beside
her sat a young man on a chair, who also had extraordinarily pale skin, and
eyes that seemed to be almost glowing. He looked up when he heard the door open
and jumped out of his chair.

“Y-you’re
demons!” he gasped, putting up his hands in a defensive gesture.

“How do you
know that?” Dipper asked, not even trying to deny it, and gave the man a suspicious
look.

“He’s a
vampire,” Bill responded for him with a nonchalant shrug.

“What?”
Mabel gave the guy a look over. Aside from the weird eyes and pale skin,
nothing about screamed vampire. He didn’t sparkle, wasn’t brooding, and just
didn’t seem like a suave seducer.

“W-when are
Ms. Northwest’s family coming?” the guy asked, wringing his hands nervously.
“Please don’t hurt me! I just need to tell her parents something, and then I’m
leaving!”

“Her
parents aren’t coming,” Mabel said, stepping forward. “I’m Pacifica’s
girlfriend; I can relay the message.”

“O-kay,”
the guy took a deep breath. “So I may have sort of, kinda turned her into a
vampire…”

“What!?”
Mabel exclaimed, also hearing an audible gasp from Dipper behind her.

“I had to!”
the guy insisted, putting up his hands like he expected them to attack him. “I
found her by the roadside, I think she was hit by a car? I called the hospital,
but she wasn’t going to make it in the time it took the ambulance to arrive,
so…”

Everyone
got quiet for a moment, before they all saw Pacifica stirring and open her
eyes; they were still blue, but now they were almost sparkling like crystals.

“Mabel…?”
Pacifica mumbled. “Where… am I?”

“You’re in
the hospital, Paz,” Mabel said, rushing to her girlfriend’s side. “I, um… I
have something to tell you…”

“Okay, but
first,” Pacifica sat up in the bed with the slightest bit of strain. “I’m
feeling kinda… hungry? Thirsty?”

“… That
would be your new vampire hunger…” the vampire spoke carefully.

Pacifica
gave him a look of confusion before Mabel confirmed that Pacifica had become a
vampire.

“On the
plus side,” the vampire continued. “Your girlfriend’s a demon; demon blood is
among the most potent, you’ll only need on average a pint a week. And I mean,
you can still eat human food, but it won’t really satisfy your hunger… still
tastes good, though,” he shrugged.

“But won’t
she turn someone into a vampire if she bites them?” Dipper questioned.

“No, no,”
the vampire shook his head. “When vampires drink blood, we only use our fangs
to make a hole, then we lick and suck the wound until we’re done. Turning
someone requires that you first drink most of the person’s blood, the reinsert
your fangs to inject a sort of venom into the bloodstream… Uh, any other
questions related to feeding?”

“Can I
drink animal blood?” Pacifica asked.

“I mean,
you can, but it tastes horrible, and it’s not nearly as filling as human blood.
I’d just choose your girlfriend over that; I’m serious, the only blood better
than demon blood is unicorn blood.”

“Look, Paz,
I don’t mind you drinking from me,” Mabel told her.

Pacifica
looked at Mabel before returning her gaze to the vampire. “How about
weaknesses?”

“Uh, you
need to be careful with fire, vampires are extremely flammable,” he listed off.
“Holy symbols won’t hurt, unless you’re religious, in which case the holy
symbol of your religion will cause you pain. You still have a reflection,
unless the mirror is in contact with silver; mirrors in the old days always had
some silver incorporated into them, that’s how the whole
vampires-don’t-have-reflections-thing started. Oh, and direct sunlight will of
course burn you, but if you use a strong sunscreen and carry a parasol, you’ll
be fine.”

“And what
about kids?”

“Excuse
me?” the vampire gave her an odd look.

“Can I
still have kids?” Pacifica clarified.

“I mean, as
long as you still had eggs before I turned you,” he responded, a bit of blush
appearing on his face as he did. “But once they’re gone, that’s it.”

Their
conversation was interrupted by a knock on the door, followed by Nurse Rand
stepping into the room.

“Ah, you’ve
awoken, Ms. Northwest,” she said, carrying a tray with food and water. “Are you
feeling alright?”

“Yes, I’m
fine,” Pacifica said. “Just… tired…”

“We’ll have
to keep you here until tomorrow,” Nurse Rand responded, placing the tray on
Pacifica’s lap. “Once you’ve rested, if you’re still feeling fine and your
condition hasn’t otherwise changed, you’ll be free to go.”

“Well, if
you don’t have any more questions, I think it’s time for me to leave too,” the
vampire butted in, and when no one protested, he left.

“I’ll stay
with Paz,” Mabel said as she turned to her brother and Bill. “You two, go out
and trick-or-treat.”

“What?”
Dipper looked at her confused. “Mabel, we’re not trick-or-treating without
you.”

“Go with
them, Mabel,” Pacifica insisted.

“Pacifica,
no,” Mabel shook her head at her girlfriend.

“It’s fine.
Just make sure you have some candy for me tomorrow,” she added in a playful
tone.

“I’m gonna
bring you a mountain of candy, babe,” Mabel promised as she hugged her
girlfriend.

 

The very
next day, after Mabel had received a message from Pacifica that she was back
home, Mabel hurried over to her girlfriend’s. After getting past the security,
she made her way to Pacifica’s room.

Pacifica
still looked pale, which was par for the course now that she was a vampire, but
she looked better than she did last night. She was lying on her bed, reading a
book when Mabel walked in.

“Hey, Paz,”
Mabel greeted her, sitting down on the bed beside her. “How are you feeling?”

“I’m still
feeling kinda hungry,” she responded, putting her book down. “But aside from
that, I’m fine.”

“Right, you
never got any blood yesterday!” Mabel hit herself for forgetting that.

“My parents
asked if I wanted to drink our butler’s blood,” Pacifica chuckled. “It was a
hard no from me.”

“How… how
did your parents react to the news?”

“Better
than I expected,” Pacifica shrugged. “They said, ‘At least vampires are classy.
Imagine if you had turned into a werewolf or a zombie.’”

Mabel let
out a giggle in response.

“Are… are
you sure you’re okay with me being a vampire?” Pacifica continued, her voice
trembling slightly.

“Pacifica,
let me tell you something,” Mabel gently grabbed her girlfriend’s shoulders and
looked her in the eyes. “When I was like twelve, my biggest dream was literally
to date a vampire. Heck, when I first came to Gravity Falls, I was crossing my
fingers that the guy I met here was a vampire. He wasn’t though… Just a bunch
of gnomes standing on top of each other…”

“But what
about the blood drinking?” Pacifica asked worryingly.

“Well, the
guy who turned you said you needed a pint of demon blood a week,” Mabel pulled
away her hair that was covering her neck.

“What if it
hurts?” Pacifica’s voice was filling with despair. “… I don’t want to hurt you,
Mabel…”

“Pacifica,
it’s okay,” Mabel took Pacifica’s hand and held it tight. She leaned closer to
her girlfriend, baring the side of her neck.

Pacifica
leaned forward, her pupils dilated and mouth slightly agape. She first pressed
her lips against Mabel’s neck, kissing it sweetly and gently several times.
Pacifica then opened her mouth a little wider, letting her tongue lick and
massage her girlfriend’s neck.

Mabel
moaned from the pleasure and anticipation, her pulse skyrocketing as a result.
The spike in the pulse made it easier for Pacifica to locate the right area.

Carefully,
Pacifica bit her now needle-sharp canines into Mabel’s neck, blood already
pouring out before she had a chance to remove her mouth. She knew blood was
supposed to have a metallic, disgusting taste, but Mabel’s blood…! Mabel’s
blood was warm, thick, and sweet, like a chocolate fountain. The taste was
bliss, spreading a heat all throughout Pacifica’s body. The previous mixture of
hunger and thirst was gone before she knew it, leaving her feeling satisfied
and full.

Pacifica
gave the wound a last lick before she finished.

“Do you…”
Pacifica licked her mouth, feeling slightly out of breath after that experience.
“Do you need a band aid for your neck?”

“No, no, it’ll
patch itself,” Mabel said. She looked just as blown away as Pacifica felt. “You
know, demon recovery and all that…”

“Did it…
hurt?” Pacifica asked carefully.

“No, it… it
felt amazing,” Mabel gasped. “I don’t know how, but that felt almost orgasmic!”

“I guess we’re
on the same page then,” Pacifica smiled and started lifting up her shirt.

“Babe, you’re
reading my mind!” Mabel giggled and began to tear her clothes off too.