Step-Sibling Rivalry (Finn Wolfhard x Reader)

𝙸'𝚖 𝚑𝚒𝚜 𝚏𝚒𝚛𝚜𝚝, 𝚝𝚘𝚘??? ( 𝐈𝐗 )

Y/n's POV:

A few hours later...

Finn and I were downstairs, including our parents
while we had dinner and talked about
tomorrows plan.
Like on how we're all packed for the vacay,
the outfits for the wedding.
Etc...

" It's really okay with you kids if you
both share a room? "
Dad asked us.
" Yeah, it's cool. "
" Mhm. "
Finn and I nodded as we both brought our
plates to the sink.
" Why are you guys in such a rush? "
Our mom asked
" Oh we- "
" We just need to go on a little errand for the trip tomorrow. "
Finn simply answered cutting me off but
I didn't mind.
" Yeah, we'll just walk. "
I added.
" What? No way are you both walking out there while it's snowing. "
She shook her head.
" What? Why? "
I questioned.
" Take the car. Finn you're driving. "
Yeah, of course Finn's driving.
" Thanks mom. "
Finn smiled
" Oh, you guys need some money? "
She asked us.
" Ye-Yes, is 50 dollars okay?
Like we said, we're buying things for tomorrow. "
I lied.
" Yeah of course, here. "
She reached into her pocket and pulled out
Two 20 dollars and a 10.
" Thanks mom. "
Finn smiled as she handed it to him.

We both started walking towards the door.
" You kids be careful, alright? "
Our mom said in a worried tone.
" Finn, watch your sister. "
Finn's dad said.
" Yeah, yeah I will. "
Finn nodded as we both put out coats and
beanie on since it was
snowing.
" We'll be fine mom. And I don't need
no baby sitter. "
I scoffed smiling at Finn hearing him chuckle as I put my boots on.
" Don't be out too late! Okay!?
Remember we have an early flight tomorrow! "
We heard our dad shout as
we walked out.

Finn and I got in the car and we soon made it to the drug store to buy plan b and
a pregnancy test just Incase.
Yeap, you heard me....
Our original plan was to just buy birth control..
But nooo!
Finn wanted to be sure I wasn't knocked up
or anything.
I mean I did joke about my period being "late" when it actually finished like last week.
In my head I was laughing...
I told him I was joking but, he knows me well enough that I may or may not be joking.
Ergoooo, we soon arrived and I kept whining
and complaining that we didn't need
to buy one.
But he insisted...

Finn's POV:

God, I forget that she can be annoying
sometimes..

" I'm telling you, get one just Incase! "
I told her as we both got out the car.
" And now I'm telling you that we don't need to because I know I'm not pregnant! "
She laughed as we walked into the store.
" Hey you're the one who "joked"
your periods late. "
I sarcastically said, but you know, I don't know
if she's joking or not...
" I WAS JUST MESSING WITH YOU FINN! "
She laughed, making me smile a little.
But we're still getting one..
" Just fucking get one? "
I begged looking at her, she then let a sigh out knowing it was a yes.

Besides, we have 50 fucking dollars!

" Okay you go get plan b and
I'll get the test. "
I said and she headed off to the counter.
Why is she there? Isn't she suppose to get it first
before she goes there??
I came to the isle for a test and I finally found one where it would show 2 lines if
you were positive.
I grabbed the test and headed to the cashier to see
Y/n still waiting in line.
I rushed and stood next to her.
" Got it? "
She questioned.
" Yup. "
I clenched my mouth, holding the test up.
" Do you have the uh?... "

Fuck, what's it called again?

" Birth control, Finn. "
She laughed as we moved in line, seeing we were the ones next after this person.
" But no not yet, I still gotta ask them for it
by the front desk. "
She answered making  me gulp and
my eyes go wide.
I guess she noticed??
" It's fine, Finn. I use to do this with one of my friends back in L.A. "
She brushed it off.
She what? Did I not?
I though I took her virginity...?
" Hold up. What do you mean?
I thought- "
I contorted my face.
" Sorry, that came out wrong.. I would accompany friends when they'd buy. "
She explained better
PHEW!
" Oohhh, okay. Makes more sense. "
I nodded.
" Did I scare ya? "
She chuckled.
" Pftt, no.. "
I looked away avoiding eye contact hearing
her giggle.
" Next... "
The lady by the desk said.
" Um, do you guys have plan b pills? "
Y/n asked nonchalantly, waiting for a response.