Y/n p.o.v

It had been a very long day. Classes seemed to drag on and the teachers of those lessons all seemed to be in a bad mood, so they just set task after task with a few breaks, with that being the case I was happy to get home.

Usually, my father would be home from work at this time, but now due to him being away for a few days I had to place to myself for a bit till Heather, Chloe or Lizzie arrived back.

Chloe had after school activities, due to her role as the school council president. Heather was probably out doing grocery shopping, and Lizzie would probably be doing.... whatever she does normally. Nearly enough a year since I met her and I don't know what it is she gets up to, but then again I have no interest in finding out, so she can do whatever as long as it doesn't bother me.

Eventually, Heather arrived back and told me how Chloe was staying out to study at one of her friends, before asking me about Lizzie.

I answered truthfully and said that I had no idea where she was. Heather looked confused, but shrugged it off and said she would prepare the evening dinner and I went to go back upstairs.

"Oh darn." I heard Heather and went to see what's wrong to learn that she had forgotten to get some key ingredients from the shops. I offered to go get them, but she said that it was too long of a journey to go on foot, so she would go.

About 30 minutes went by, before the house phone received a voice message from Heather, saying that traffic was keeping her hindered up, so she would be a bit longer than she thought. So, it wasn't a problem for me.

I decided to go upstairs and have a shower, whilst waiting for someone to get back.

As I was in the shower letting the water rain down on me, I heard the front door open and shut with the sound of laughing. 

As it turns out..... Lizzie was back.

Lizzie ignored me though and just walked in naked with a towel on, wrapped around her chest.

"Hey, I told you I was in here." I said to which she snapped that I should've locked the door, but I countered that the house was empty, so I didn't see the need to.

"Haven't you heard of the word, ‘privacy’?" I asked but she just stared blankly at me, then saying that she was already naked so she was going to take a shower before again telling me to move over. I obviously refused so she just shoved me back to slide into the shower.

"What the hell is wrong with you!?" I asked before catching the stench of alcohol.

I reminded her about the rule my father made about her not to go to wild parties but Lizzie replied that my father wasn't here right now, so she could do whatever she pleased.

She was such a brat.

"Jeez, couldn't you have at least waited, until I finished here before you just come barging in?" I asked to which Lizzie told me to just shut up and hurry, so she didn't have to share a shower with me before turning away.

"Now make yourself useful and wash my back for me." She demanded and I asked her why I should do that.

"Shut the fuck up, and do it." She spat and I rolled my eyes before starting to wash her back.

Lizzie pressed her hands to the shower wall as she bowed her head forward to let the water run down her back, her body glistening beneath the jet stream flow. I just washed her back before running my hands down to her hips then up again.

"And watch where you're touching, ya perv..." she spat and I groaned.

I told her that if anything, she was the pervert for just walking in, when I clearly said I was in the shower, then the fact she just pushed herself in to join me.

"...Whatever."

She knew I was right there, and if I know Lizzie, its that she only gives snappy response when she knows she's wrong.

As I washed the back of her body, Lizzie stood straight but as she did so my hands moved to the front of her body where I groped her chest which made her jump and push her ass against my crotch.

"You filthy pervert, groping me like that..." she spat, but I countered that she caused it which made her turn to face me fully, a glare in her eyes as she jabbed finger at my chest so I backed against the wall.

She went on a berating rant about me apparently being a pervert, but the only thing I was focused on was the smell of her breath.

"(Sniff)....have you been drinking?" I said to which she snapped that she was only around people who were but I pointed out her breath smelling like alcohol. She suddenly got defensive and admitted that she had been drinking but it was only one beer, "....Just the one. So sue me or are you going to rat me out to mum or your dad?" she spat whilst shoving me.

I groaned before telling her that I won't say anything if she would just shut up but she scoffed.

"Yeah right as if you'd keep quiet, you'd just hold this over my head." she spat before asking me what it would take me to shut up. 

"You want me to blow you or something?"

‘Did she seriously just say that.’ 0_0

I asked her what she was thinking of offering that before pointing out our relationship, but Lizzie scoffed and batted her hair over her shoulders.

"As if you don't want me to, a pervert like you probably jerk off every night to the thought of fucking your own stepsister." she said before pushing me back against the shower wall and got to her knees to stare at my hardening length.

"See, clearly you want me to, you perv..." she spat and I again pointed out the fact that she was the one who burst into the bathroom as I was showering, pushed me to let her in and now she offered this.

"If anyone here is a pervert, it's you." I tell her, but she just simply told me to "shut the fuck up."

With that, Lizzie grabbed my erect length and held it as if to weigh it before she poked her tongue from her lips and touched the tip. Her blue eyes just staring as if scanning very detail.

"......Guess it's a decent size." She commented before again poking her tongue against the tip and followed up by enveloping my cock into her lips. 

She stared up at me as she did this as if waiting to see what response I would give to this, her eyes narrowing as I looked down at her which made Lizzie pull her head back and ask what I was staring at.

"What're you staring at?" I countered to which she just flipped me off and took my cock into her mouth again.

Her hands pressed to the wall behind me as if to block and lock in place as she bobbed her head along my cock, Lizzie staring up into my eyes every second as her lips glided along the length.

Her gaze was daunting and even taunting as if she knew that I was actually feeling good from this, if this wasn't to "keeping my mouth shut", about her drinking, then she would probably be holding this over my head for an eternity.

Lizzie lifted her lips back away from my phallus, took it in her hand, and started pumping again. Her lips sucking on the tip before licking along the side. 

All whilst not breaking eye contact with me, she really was just taunting me about this.

"So pervert, enjoying getting sucked off by your stepsister?" She smirked before wrapping her lips around my cock again and bobbing her head, I even reached my hand into her golden locks and didn't pull it away as she glared up at me.

Lizzie then started to moan around me and I saw her free hand down between her legs before amidst the sound of water running over us was a small squelching noise as she pumped a finger into her self. Her legs parting even more as she bobbed her head faster and took more of my cock into her mouth.

"Lizzie..." I grunted and she gasped whilst pulling her head back, so my cum splattered into her face.

"Ugh, it's so sticky." She groaned with disgust as she wiped my off my cum whilst also letting the shower cleanse her body before standing up

Instead of just going to say, I was obligated to not speak about her drinking, Lizzie turned away and bent herself forward to brace against the shower wall whilst looking to me. From this position, I had a clear view of her pussy, glistening but not from the shower water but instead with arousal.

"Don't get all smug about this, asshole. You're gonna have to take responsibility for getting me this wet, jerk." She spat before getting even more defensive and said it wasn't as if she was aroused from sucking me off.

I mean, I already received oral from my stepsister, so we might as well go the rest of the way when we're this far already.

"I still hate you, and for this you are officially agreeing to never rat on me for anything." She snapped as I plunged into her entrance. Lizzie pursed her lips together instantly as she stared back at me, then her eyes went down to watch as I slid myself into her moist depths.

She was tight for sure, but I easily went all the way inside of her.

"As if I'd let my stepbrother take my virginity, you pervert." She spat and I for the third time replied that she was the pervert for being the one to want this the most.

Saying that that made her flip out.

She ranted about her only choosing to do this to shut me up and that she got aroused so I had to take responsibility for it.  "So you're boasting a decent size that's bigger than the last guy I fucked... big deal, don't get smug about iiiittt!!"

The last word was drawn out as I quickly hilted myself into Lizzie, her hands pressing flat to the shower wall as was her upper body whilst she gasped before looking to me with her opal eyes. 

Her mouth open with surprised breaths at my sudden and rather bold move before she pursed her lips together and looked away.

Her body pushed back against mine as to tell me to begin, so I gripped Lizzie's waist and began to thrust into her wet pussy.

"Tell anyone about this (ah!), and I'll kill you!" She threatened whilst trying to keep a straight face as she looked to me. The expression she pulled though took away all intimidation from that threat as her cheeks were flushed and mouth open with moans.

I just pumped myself into Lizzie as she braced herself to the wall, her head pressing against the tiles as she started moan more freely than the held back ones from before.

Of course, she was tight. Must've have been some time since she last did this, then with how wet she was and clearly not from the shower. "could she have been wanting this longer than she let on. Is this why she acted all bitchy, from sexual frustration?" I thought to myself before looking to Lizzie, her eyes staring back at me as she moaned.

I decided to investigate further, one of my hands sliding down to cup her ass as the other went to grope her chest.

A whine left Lizzie as I touched her, a needy one I might add and so I gave a deeper thrust which made her twist a little.

"Fuck! Ah, fuck!" She gasped, but before covering her mouth with her free hand, her cheeks flushing red before she went to snap some defensive remark. The only noise leaving her however was a yip as I pulled her and pressed her body to the glass of the glass shower wall that had steamed up.

Lizzie stared back at me with a surprised expression as her breasts pressed flat against the glass.

"Just how badly have you been wanting this?" I asked and she immediately went tight lipped, refusing to reply other than with moans but her mouth fell agape as I gave another deep and rough thrust that made Lizzie tremble.

"Fucking...pervert..." She shivered as I leaned to her ear to say that was what she was and she glared at me, her blue eyes trying to look intimidating but the lustful haze in them took away any threat as I was getting rougher with her.

Lizzie's legs trembled before she suddenly cried out in release, her juices gushing out as she spat out, "Fine, damn it! Yes, I've been wanting some good sex for so long! Cause my last boyfriend didn't do anything good for me... but now you--(oh fuck!), You're so big and your hitting my deepest spots!"

It was a sudden confession, but enough for me to amp things up as I quickly pulled from Lizzie and scooped her up before pinning her back to the wall again as I plunged into her again.

Her hands gripped my shoulders tight as I held her thighs, our bodies colliding rapidly and forcefully as I was taking her like this and the haze in her eyes only fogged up more. 

I decided to see how far I could push this and asked how much she was feeling about being taken like this and she started panting.

"Ah! Ah yes! Stuff me full! I love it!" She sputtered out as I held her up against the wall, her eyes were glazed and her tongue lulling out of the corner of her mouth. Our gazes locking for a moment before Lizzie suddenly closed the gap and locked out lips, her hand cupping my face as she held our kiss.

Her tongue swirled around inside my mouth and prodded my own as my hips pumped against hers with the sqealching noises of our sexual connection becoming louder.

Our kiss broke apart and Lizzie started gasping and panting again before begging. "Please, cum inside me! Fill me up, I want it!" She had a haze of lust in her eyes as she leaned close before a wide grin formed upon her lips with a squeal of delight as I pressed our bodies close, pinning her to the wall as I came inside her and it set Lizzie off.

"And to think...you calling me...a pervert." I said catching my breath as Lizzie clutched me close before admitting, shamelessly as well, that she was the pervert.

I set her feet steadily onto the floor whilst withdrawing myself from her body and Lizzie nearly collapsed there and then as our mixed cum leaked from her pussy, her hands pressed to my torso as she stared into my eyes with the haze clearing up.

Her lips pursed together as her cheeks flushed red before she turned away and and asked me to wash her back again, and I was happy to do so.

~Timeskip~

After our shared shower, me and Lizzie got dressed, just before as Heather returned home with the last few ingredients needed. She complained a little about the traffic, but didn't dwell on it too much as I helped her with the bags.

Heather saw Lizzie and smiled, asking what she had been up to and my dear stepsister had returned to her original attitude and said that she had done nothing. 

She was definitely back to normal as she spoke with an abrasive tone. 

That conversation was left there, so Heather going to finish off fixing the evening meal, which we all had before going to do our separate things until night fall and we each headed to bed.

Sometime around midnight, I found myself stirred awake by a feeling in my lower regions.

I switched on the lamp to see my blanket rising and falling and I lifted it up to see Lizzie staring up at me with my cock in her mouth, she didn't pause or panic at being caught, but instead she just continued as I found her. 

I just let the blanket down over her again and let myself indulge in the pleasurable feeling she was giving me. 

Something told me that things were going to be very different around the house. 

That was a definite certainty.