My “Twin” Step-Sister [M/F]

People call us twins. I’d like to put on record that we are not. We don’t even look like twins!

We were both born on April 1st, 1999. I was born at 7:34:02 AM while she was born at 7:34:18 AM. We were even born in the same hospital. However, my mother didn’t survive her delivery while her father decided to ditch his girlfriend and abandon them.

For 11 years it was my father an I. We weren’t alone, he was 18 when I was born and worked his ass off to provide for me. Luckily for us he has a great support system and my grandparents took care of me while he worked.

She was a little well off. Her parents are rich so she had maids and whatnot. Her grandparents weren’t around for her as much, and while her mother did her very best to take care of her it ended up being the nanny who did most of her raising.

Long story short, her mother and my father met, fell in love, and here we are. Step-mom insisted on us living together in her house, a nice two story house that my father felt so uncomfortable in because we lived in a small apartment most of my life. We felt like we were walking on eggshells, but over time we got used to living there.

The maids were let go, as well, with a generous going away present. My parents felt it necessary that we have a “normal” family.

So she and I lived together, my step-sister. When our families found out that we were born on the same day, almost the same time, they started calling us twins. She and I hated that for obvious reasons, and she took that frustration out on me. She’s always been a little spoiled as she has gotten her way for the past years. Her grandparents spoiled her and she hasn’t been told “no” very often. My grandparents taught me discipline and restraint, to be kind to others, and help those in need.

So our family has been together for 7 years now. We’re both 18 and seniors in High School. She has her own social circle and I have my own. She’s in the cheer leading squad and I’m in chess. While I’m technically older, looking at us you wouldn’t think so. I’m tall, lightly muscled white boy with glasses and black hair. She’s Latina, 5’5 with thick thighs and a nice figure and pretty, as some people would say. I’ve noticed her body changes and I guess hormones have started to kick in because I’ve started to have feelings for her, but every time we talk and she would berate and be so mean to me that feeling kind of goes away only to come back from time to time.

Our parents are away on their yearly vacation, they take one every year to basically fuck each other senseless because they’re so in love with each other. It’s actually sickening and they come back all giddy and shit. It’s sickening, but honestly I want that in my life someday. They’re both good looking and still somewhat young, so why the hell not?

So I come home from my friends home to find a sight. Well first, I heard her. She’s screaming bloody murder and as I look up I see her head stuck in the banister.

“How the hell!?” I asked her as I rushed upstairs.

“Just shut up and help me, okay?”

I realized she’s still wearing her cheer leading outfit, and her phone is off to the side and is recording. What the fuck? Is this one of those Tik Tok challenge? “How long have you been stuck here!?”

“10 minutes! Now shut the hell up, runt and help me!”

Runt. She’s called me that ever since we’ve met. Growing up, she was bigger than I was and she constantly bullied me. That old feeling came back again, but now I think it’s time for revenge.

“What did you call me?”

“I… just get me out of here, runt, or else!?” She kind of of tried to tear herself off from the wooden banister but couldn’t. She’s shaking herself, jiggling and I can see her fine ass jiggle a little.

“Or else what? Huh? You’re stuck there, what the hell can you do!?” I gave her ass a little smack and she yelped.

“What the fuck!? Alan, don’t you dare! This isn’t some porno, I’m really stuck here!”

“I know, and I’ve been dying to do this for a bit now.” I got myself behind her and she gave me some kicks that was kind of slow. I hooked her black spandex and pulled it down, revealing her nice pussy to me.

“Alan! What the fuck, stop!”

“Oh, you’re pretty wet already, Cynthia. You’re turned on aren’t you?” I slid myself down, hooked my arms under and around her thighs and cupped her nice ass. I helped myself to her juicy, wet pussy that day and her taste was something else. Salty, on account of the sweat, but some hints of acidity. “God, you taste good, Cyn.”

She’s not crying, I don’t think, but she’s whimpering and moaning a little. “Get me out of here, runt! I swear when I do I’m going to — Ugghhhh unnhhh — I’ll fucking kill you.”

“Admit it, you’re enjoying this Cyn. I’ll get you out, just let me have some fun.”

“Fuuuuckkkk…. Fuuuuckkkyou Alan!” She moaned as she clamped her legs around me and squeezed. I think I found a kink, because I enjoyed her thick things just squeezing me, trying to break my head. I slurped and licked and when the pain got a little too much for me I threatened to invade her *other* hole and she would let off. I started playing with her clit, rubbing it in a circular motion and she liked that as her moans got a bit louder and more honest.

“Alan, please get me out of here. I promise I won’t tell mom and dad.”

“Oh, I wouldn’t care if you did anyway.”

“What? What do you mean?” came her confused reply.

“I’m shipping out for boot camp a week after our graduation.”

“You… you’re leaving? You’re leaving us?”

“Why, what’s the matter? I thought you couldn’t wait to get rid of me. You’ve been saying that since me and dad moved in.”

“That… that’s right! Good, you’re leaving! Now get me the fuck out, Runt!”

I hated that word, so I pushed myself in deeper. I kissed and licked her labia, playfully biting it and rubbed her clit. She started shaking more, moaning as her love juice started flowing out. Tasty, I’m going to miss that, but eventually her shaking grew more intense as she reached her orgasm. “Fuck! Alan! Nooooo! Ahnnnnn shiiiiiit!!”

Her breaths came in sharp and quick and I took myself away and wiped my face. Her body relaxed and collapsed about as much as it could without choking herself. Now’s the time to do this as I reached in to spread the banister a little so she could relieve herself.

Now I forgot to mention this before, but I’d like to add something. My sister is genetically gifted, as far as I know, and she’s been doing some exercises from the time she was 7 to now. For the past 11 years she has been doing Karate, and she has built herself into a, for lack of a better term, demon. She would practice her throws and kicks at me, so when I thought her orgasm-addled body is too weak and I could just help get her head out and then fuck off out of there, imagine my surprise when I heard the sound of wood creaking and cracking.

And then shattering.

“Oh… you’re free,” I said meekly as she slowly rose up and her hands held the shattered remains of the banisters. “Mom and dad won’t… won’t like that, you know. That’ll take a bit of money to fix.”

She didn’t utter a word. She just looked at me from behind a veil of her long, brown hair, kind of like that girl from the Ring. She threw the pieces of wood down and rushed me, her hand finding my neck and slamming me against the wall.

“Cyn, just relax for a second there, ok? I was going to help you out, I swear!”

She didn’t say a word. She just led me down the hallway by my throat, and I felt it tighten when I resisted. I’ve just seen her rip apart wood with her bare hands so what chances does my windpipe have?

We have an entertainment room a little off to the side around where the stairs are. She took me in there and pushed me down the couch. Her hand never left my throat as she brought her face near mine as she sat next to me.

“You…. you’re leaving us!?”

“What? Yeah,” I croaked, “you should be happy, right!”

She kissed me, I was shocked, but her hand didn’t leave my throat again. She took off the spandex that’s been around her knees, I’m amazed she walked well with those on restricting her movement. She straddled me and then she took off her top.

“This is you’re fault, runt, you forced me to do this.”

“What, I didn’t force anything other than your spandex and my tongue into your pussy!”

“You turned me on, fuckface!”

In a flash she got my shorts off and went back to straddling me. She guided my cock up to her wet cunt and slid herself down, wincing at the slight pain. She’s a virgin! Yes! I groaned as I felt her tightness wrap around me.

She leaned forward and it allowed me good access of her juicy tits. I took a brown nipple into my mouth and sucked her, while my ass rests atop her bouncing ass. “You’re joking, right? You’re not leaving, right?’ She asked while moaning and whimpering as my cock continuously slipped in and out of her.

“I really am, Cyn! We’re graduating this week and I enlisted so next week I’m joining the army.”

She gave me another whimper as she looked down at me, her long hair dropping all around us like curtains. For a second we just looked at each other, getting lost in our eyes, and we just kissed.

She took herself off my cock and she started stroking it as she kissed me again. She then got herself in reverse cowgirl and got her pretty pink kitty down my pole again. God she’s so fucking tight and I slapped her ass to remind her that she’s doing a good job. She shook her ass for me as she looked back and bit her lips seductively. I can’t handle that so I grabbed her by the breast and got her to lay her back on me. Her legs spreads and I thrusted up and into her.

“You’ll come back, right?” She moaned as she looked back at me as she angled herself. She rests her arm around the back of my head and I licked and sucked on her tits while my thrust’s started to increase in tempo.

“Of-Of course I’m coming back! I’ll only be gone for a couple of months for basic training.”

“Promise? When you come back, don’t leave again ok? Promise me you won’t meet any other girl, ok?” she kept whining as she moaned harder and louder.

“Since when did you become this needy?”

“I’ve liked you ever since we met, but… I couldn’t really express myself well.”

I fucking knew it! I just laughed and I pulled her in for a kiss. “Okay, I promise I won’t leave you again and I won’t meet any other girl.”

She laughed and giggled at that and she started rubbing her clit. “God, you’re so fucking tight Cyn!”

“I’ve been waiting for this for a long time! Ever since we turned 18, I wanted to do this even during our birthday celebration, but I got scared. God, right there Alan, keep fucking me right there!”

My thrust started to speed up. “Cyn, I’m going to come. Get off me, I don’t want to knock you up.”

“Runt, no I’m not getting off! I’m on the pill, just come inside me.” She cooed as she looked down.

“I don’t remember — oh god, you’re clamping down on me!”

She started to shake and spasm again as her hands worked furiously around her clit. I could feel her gushing around me, squeezing me hard like I owed her money, and I couldn’t hold back. In my euphoric release, I sent my baby batter up to her cervix, splashing it white and I could feel my energy just drop, my head becoming light. Her entire body is quaking in pleasure as I watch it wash over her. She shouted and yelled, moaning and mewling. Her pussy spasms didn’t stop, so I kept fucking her while my rod is still hard.

“Still….ugh…. still sensitive Runt….”

“Call me, Runt again.”

“ahh.. ahhh.. Ru… Runt.”

I slid myself down a little off the couch, angled her just a bit so she’s resting on me even more, and then furiously started fucking her while holding her legs open.

“Ahhhhhh shit! Alan! You’re going to make me come again!! Alan, I’m coming!!” She’s wracked with another body shattering orgasm as it took her by force, her legs stiffening and contorting and her back arching. She whimpered and mewled like a cat and then she slid off of me and laid there.

“Ohhhh, runt, that was good…”

I gave her a playful slap, “Don’t call me that again.”

“Alright, daddy.”

Oh Jesus Christ.

***

For the days following my departure we fucked like you wouldn’t believe. Every night I would come into her room, making sure our parents are asleep, and would fuck her as we spooned together. She would blow me and let me eat her out during the afternoons.

She cried when I left, and I promised to come back.

Nine weeks passed and I’m walking up to the house in my military fatigues, carrying a duffel bag. Who do I see but her bouncing down from the door and leaping into my arms.

“Oooh, you’ve gotten bigger there, Runt,” she cooed into my ears. I set her down and ran my hand across her waist and felt…. something.

“Is that…?”

“Yup,” she said while she nodded, her smile is soft but there’s a hint of shame in it.

“But I thought…”

“The birth control didn’t take, or at least it wasn’t working when we… when we fucked that day.”

“It’s mine?”

“You’re the only one I’ve been with.”

I couldn’t contain my smile as I lifted her up again and embraced her, her thick legs wrapping around my waist. Well, I *was* smiling…

“Alan! Why the fuck did you get your sister pregnant?!” My father yelled from the door as he charged at me, fury written across his face.

“Ah shit, no dad wait!”

Source: reddit.com/r/eroticliterature/comments/pm4d8l/my_twin_stepsister_mf

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