Step-Sibling Rivalry (Finn Wolfhard x Reader)

𝙳𝚒𝚍 𝚠𝚎 𝚏𝚞𝚌𝚔 𝚞𝚙?

Y/n's POV:

" I can- "
" I could- "
" Maybe if I- "
" No, it's fine I can- "
Finn and I both say talking over each other.
" I'll just do it. "
I chuckle, managing to reach for the phone, it was mine too.
" Who is it? "
Finn questions me, as he traces his cold finger
down my face.
" It's mom. Hold on. Mom? "
I answered and tried not to sound like I was exhausted or something.
" Y/n? When are you and Finn coming down?
The food's getting cold, honey?
Is everything alright? "
My mom asks me from the other side of the line.
" Yeah, mom. E- Everything's fine. We were just uh watching a movie and I guess we just
lost track of time. "
I say, palming my forehead.
" Alright then but Y/n, you sound tired?
Should I come up and check on you? "
" NO! "
I accidentally shouted, seeing Finn's eyes go wide.
SHIT. Nice going Y/n.
God, I hope I didn't wake Brand up...
" No??  What do you mean- "
" I mean no, Ma. You don't need to come up and check on me.
I'm okay. I promise.
We're okay. "
I explained, and thankfully she wasn't coming up.
She just told us to hurry down...
" Everything okay? "
Finn cutely tilts his head to the side.
" Yeah. We just need to go down already. "
I smile, leaving a long kiss before I manage to snuggle under Finn to stand up from the bed
with the cold white sheet wrapped around my body.
" You should get ready too, Finn. "
I look back one more time to him, sending a smile before turning to the bathroom.

On the other hand,
I was get ready in the bathroom,
changed into something casual, and lightly did
my make-up.
That's when a specific someone came up from behind.
" Y/nnnnnn. "
He teases my name, leaning on to counter with his face turned to me.
While I was prepping mine, I noticed he still hadn't changed,
only wearing a bathrobe.
" Finn?
You should have changed already.
Both mom and dad are waiting, you know? "
I say since I didn't want to keep them waiting.
If we do, they might suspect something
and end up coming upstairs.
Which I don't want...
I'm sure neither does Finn.
" I know. But I'm still- "
He tilts his head from side to side, signaling to me that we should go back to bed.
Pulling me closer by my hips.
" You know we can't. "
I smile leaning into his chest before checking myself in the mirror
once more.
" Please, Y/n?
We can say we had other plans. That- that we ate somewhere else or ordered food service.
I don't know... "
Finn looked down, and I knew he was trying to think of more excuses
for us not to go.
" We can't, Finn. They might suspect us or something. "
I say turning my body to face him.
" How? "
He moves closer.
" We've been doing it too much.
Always calling dinner off and hanging out, with well,
just us. "
" They won't. We're siblings.
We're supposed to be hanging out. "
" Yeah? But not ALL the time cause then...
It'd be weird, ya know? "
" Why would it be weird? "
" I don't know. Like you don't have friends that don't hang out
with their brother or sister 24/7? "
" I do? But why would it still be weird?
We're not related "related"?
He laughs, but for some reason, it was kind of bothering me.
" That- That's not what I meant, Finn.
You know we- "
" Oh c'mon Y/n? Call in that you're not feeling well.
Anything to not go?
Feel this. "
Finn cutting me off, he takes my hand, making me feel his erection from the bathrobe.
Finn was still somehow in the mood, but I wasn't.
As much as I wanted to so that he still had a little pleasure,
I was quite tired actually.
We have been having sex a lot more frequently.
In the hotel room, public bathrooms, the pool?
" Finn. As much as I want to, I'm kinda tired from earlier- "
" Not even just a quickie?
We won't take long, I promise?
I'll do all the work? "
He smiles hugging me from behind, wrapping his arms around me.
His hand suddenly maneuvered to my the inseam of my shorts.
Before he could make me feel something I moved away,
" What was that for? "
Finn's eyebrows furrowed, waiting for me to answer.
" I told you.
I'm tired and I'm not really in the mood- "
" Yeah, but I can make you- "
" Finn, stop- "
He does the same thing but I quickly move away.
" -Please. "
I added, and I could tell he wasn't very pleased.
The expression on his face had changed.
His smirky grin had disappeared and now it's turned cold...
" Why'd you have to move away like that? "
The tone of his voice had changed too.
Nervous, I,
" I didn't mean to, Finn.
You just weren't listening to me and kept cutting me off. "
" Cutting you off?... "
In a stern voice, he refracted my words.
Looking down, since I didn't really know what else to say...
" I'm just saying how I feel Y/n. And I was asking if we could-
What? Did I do something? "
He pauses his sentence.
" Finn, I just asked nicely for you to stop because I'm not in the mood. "
I cleared my throat.
" Okay? But then why did you push me away? "
He raised his voice a little.
" I just said so. Because you wouldn't stop!
I told you twice! "
I laugh, in disbelief that if he's serious right now.
" Why aren't you in the mood then? "
He looks me up in down, that look still on his face...
I kept quiet...
Knowing now that if I just said yes, we wouldn't have this argument.
" Y/n, are you even listening? "
That's when I snapped...
" Jesus, I'm fucking tired! Okay, Finn?
I'm fucking tired!
Is that so hard to ask that I don't wanna fucking have sex right now!?
God... "
I splurged a bunch of words out, and Finn was speechless.
When he...
" I thought this relationship was supposed to be 50/50? "
He objectified.
" Oh my god! "
I whispered, leaning on the marbled wall of the bathroom wall.
" Tell me, Y/n/n. Tell me. "
Why is he being such an asshole???
Can't he understand that- fuck never mind. 
I looked at my watch, we're both supposed be downstairs 20 minutes ago...
Without even saying anything,
I stormed out the bathroom, going to the nightstand to grab my phone
and leave.
" Y/n! "
Finn called my name out from the bathroom, and right before walking out.
I noticed we'd woken Brand up since he sat up.
" What's going on? "
My best friend having no clue on what's happening.
" Sorry we woke you up Brand, call you later? "
I say sending him a small smile,
dropping it as soon as
Finn and I faced each other.
" You're going without me? "
His facial expression was different again.
The coldness disappeared, only feeling as if he didn't
want me to go without him.
My face twitched, stopping myself from saying something.
If I did. I probably would have made things worse...
But I didn't.
" Y/n? Look, I'm sorry- "
I brush past him, leaving the hotel room.
Closing the door, not knowing if that was the right decision or not?
" Fuck. "
I mouth before walking to go get a cab to the restaurant.
Was me leaving the room make things worse between Finn and I?
Should I have said something?
Fuck, I don't know...