Summer Sin

My name is Alexander, and I was 19 years old when this happened. Anna, my older sister, was 24. We had always been close — closer than most siblings, I guess. Growing up, we shared everything: secrets, late-night talks, even the same bathroom when we were kids. But after I turned 18, something shifted. I started noticing her in ways I never should have. The way her tank tops clung to her full, perky C-cup breasts when she came out of the shower. The curve of her hips in those tiny sleep shorts. The soft sway of her ass when she walked around the house in just a T-shirt and panties. She had long, wavy chestnut hair that fell down her back, smooth olive skin, and these big hazel eyes that could make my stomach flip.

Our parents had gone on a two-week anniversary trip to Europe, leaving the house to just the two of us. It was the middle of summer, hot as hell, and the AC in our old house barely worked. That Friday night, everything changed.

I was in the living room watching some mindless movie, shirtless in just my basketball shorts, trying to stay cool. Anna came downstairs after her shower wearing nothing but an oversized white T-shirt that barely reached mid-thigh. No bra. Her nipples were clearly visible through the thin fabric, and the hem kept riding up every time she moved, flashing the bottom curve of her ass. She smelled like vanilla body wash and something sweeter — just her.

“Hey, loser,” she said with that teasing smile she always gave me. She flopped onto the couch right next to me, closer than usual, and tucked her legs under her. Her bare thigh pressed against mine. “What are you watching?”

I tried to act normal, but my cock was already twitching. “Nothing good. You?”

She shrugged and reached for the remote, her shirt riding up high enough that I caught a glimpse of her smooth, shaved pussy. No panties. My heart slammed against my ribs.

We ended up watching some stupid rom-com, but neither of us was really paying attention. The tension in the room was thick. I could feel the heat radiating off her skin. After about twenty minutes, she turned to me.

“Alex… can I ask you something weird?” Her voice was softer than usual.

“Yeah, anything.”

She bit her lip, looking almost nervous — something I’d never seen from confident, take-charge Anna. “Have you ever… thought about me? Like, in a way you shouldn’t?”

My mouth went dry. I stared at her, pulse hammering in my ears. “What do you mean?”

She shifted closer, her knee brushing my thigh again. “Don’t play dumb. I’ve seen the way you look at me lately. When I come out of the shower. When I bend over. I’m not blind, little brother.” She smiled, but it wasn’t her usual teasing smile — it was darker, hungrier. “And honestly? I’ve been thinking about you too. A lot.”

I couldn’t breathe. “Anna… you’re my sister.”

“I know,” she whispered, leaning in until her lips were inches from mine. Her breath smelled like mint toothpaste. “That’s what makes it so fucking hot.”

Before I could say another word, she kissed me.

It wasn’t soft or hesitant. It was desperate, hungry. Her tongue pushed into my mouth instantly, and I groaned against her lips. My hands found her waist and pulled her onto my lap. She straddled me, her shirt riding all the way up, and I felt the wet heat of her bare pussy grinding against the bulge in my shorts.

“Fuck, Alex,” she moaned into my mouth, rolling her hips slowly. “You’re already so hard for me.”

I slid my hands under her shirt and cupped her perfect tits. They were full and heavy, nipples rock-hard against my palms. I pinched them gently and she gasped, arching her back.

“Harder,” she demanded. “I like it rough.”

I squeezed her nipples harder, rolling them between my fingers. Anna threw her head back and let out this low, throaty moan that went straight to my cock. She reached down between us and yanked my shorts down, freeing my throbbing dick. It sprang up, thick and veiny, the head already glistening with pre-cum.

“Jesus, little brother,” she breathed, wrapping her fingers around my shaft. “You’re bigger than I imagined. So fucking thick.”

She stroked me slowly, twisting her wrist at the head, her eyes locked on mine the whole time. I was panting like I’d just run a marathon. I slid one hand between her legs and found her soaking wet. My fingers slipped easily between her slick folds, circling her swollen clit.

“Anna… you’re dripping,” I groaned.

“Because I’ve been wet for you for months,” she confessed, voice husky. She lifted up slightly, positioned my cock at her entrance, and sank down in one smooth motion.

The feeling of her tight, velvety pussy swallowing every inch of me was unreal. She was so hot and wet inside, gripping me like a vice. We both moaned loudly as I bottomed out, my balls pressed against her ass.

“Fuuuuck,” she whimpered, forehead pressed to mine. “You’re stretching me so good, Alex. My little brother’s cock is inside me… God, it feels so wrong and so fucking perfect.”

She started riding me slowly at first, grinding her clit against my pelvis with every roll of her hips. I gripped her ass with both hands, spreading her cheeks as she moved. The wet sounds of her pussy sliding up and down my cock filled the living room — obscene, filthy, addictive.

I thrust up to meet her, driving deeper. Anna’s moans grew louder, more desperate. She leaned back, hands on my knees, and rode me harder, her tits bouncing beautifully under the shirt. I yanked the shirt over her head and tossed it aside so I could watch them properly.

“Play with my tits while I fuck you,” she ordered breathlessly.

I obeyed instantly, sucking one nipple into my mouth while pinching the other. Anna’s pussy clenched hard around me. She was close already.

“I’m gonna cum, Alex… don’t stop… fuck your big sister’s pussy just like that!”

Her whole body started trembling. She slammed down on me one last time and came hard, her walls pulsing and milking my cock. A gush of her juices soaked my balls and thighs. She cried out my name over and over, shaking violently in my lap.

I didn’t let her recover. I flipped her onto her back on the couch, spread her legs wide, and drove back into her in one thrust. She wrapped her legs around my waist and pulled me deeper.

“Harder, little brother,” she begged. “Fuck me like you own me.”

I fucked her like an animal — deep, punishing strokes that made her tits bounce wildly. The couch creaked beneath us. Her nails raked down my back, leaving red lines. Every time I bottomed out, she let out a sharp little gasp.

I could feel my own orgasm building fast. “Anna… I’m gonna cum inside you.”

“Yes!” she cried, locking her ankles behind my back. “Cum in me, Alex. Fill your sister’s pussy. I want to feel you pulsing inside me.”

That pushed me over the edge. I buried myself as deep as I could and exploded. Thick ropes of cum shot into her, flooding her womb. I kept thrusting through it, pumping every drop into her. Anna came again right after me, her pussy squeezing me so tight it almost hurt.

We stayed locked together, panting, sweating, hearts hammering. My cock was still twitching inside her, leaking the last of my load.

“Fuck,” she whispered, kissing me softly this time. “That was… incredible.”

I pulled out slowly and watched my cum drip out of her swollen, pink pussy. The sight made my cock twitch again almost immediately.

Anna noticed and smirked. “Already? Greedy boy.” She slid down the couch, got on her knees between my legs, and took my cum-covered cock into her mouth.

She cleaned me thoroughly — slow, loving licks, sucking every drop of our mixed juices off me. When I was hard again, she looked up at me with those big hazel eyes.

“Bedroom,” she said simply. “I want you to fuck me all night. Every hole. I’ve waited too long for this.”

We barely made it to her room before I had her bent over the bed, ass up. I fucked her doggy style next — hard and fast, slapping her ass until it was red. She came twice more before I filled her again.

Later, she rode me reverse cowgirl so I could watch my cock disappear into her ass after I lubed her up with her own juices. She took every inch like she was made for it, moaning my name the whole time.

By the time the sun came up, we had fucked four times. Her pussy, her mouth, even her tight little ass — I claimed everything. She was covered in my cum, marked, claimed.

We lay tangled in her sheets, exhausted and glowing. Anna traced lazy circles on my chest with her finger.

“I love you, little brother,” she whispered. “Not just as family. I’m in love with you. And I don’t want this to stop.”

I kissed the top of her head. “It won’t. You’re mine now, Anna.”

She smiled against my skin. “Good. Because I’m going to need this cock inside me every single day while Mom and Dad are gone… and probably after they come back too.”

That summer changed everything between us. What started as one forbidden night became our secret addiction. Every chance we got, we fucked — in the kitchen, in the shower, in the backyard at 2 a.m., even in her car in the driveway once.

I was 19, and I had fallen completely, dangerously in love with my older sister.

And I wouldn’t trade a single second of it.