WARNING: The following story contains explicit sexual content between family members and is intended for mature audiences only. Fictional made up story all characters are 18 and over.
I’ve always felt a deep connection to Kirsty, my little sister. Growing up, we were each other’s world. While other siblings might have had their fair share of fights, Kirsty and I had a bond that felt unbreakable. She was my best friend, my confidante, and the one person I could be completely myself with. Over the years, as we both grew older and life threw us different hurdles, that bond only seemed to strengthen.
It was a Saturday night, the kind that starts innocently enough. Kirsty and I decided to revisit our old hangout spot, a local bar where we’d spent countless evenings as teenagers, dreaming about our futures. We ordered our usual—cold beers and a plate of greasy fries—and the conversation flowed as easily as the drinks. We laughed about the pranks we used to play on our parents, the awkward phases we went through in high school, and the crazy dreams we had back then. It felt like time had stopped, and for a moment, we were just kids again.
As the night wore on, the bar cleared out, and we found ourselves the last patrons. The bartender gave us a knowing look, and we decided it was time to call it a night. Kirsty hesitated for a moment, fidgeting with her empty beer bottle. “I don’t want to go home,” she admitted, her voice tinged with a mix of vulnerability and defiance. “My boyfriend hates it when I drink. He gets all controlling and psycho.”
I felt a pang of anger and protectiveness. “You don’t have to go back to him, you know,” I said, my words a bit slurred from the alcohol. “You can stay at mine tonight if you like.”
She looked at me with those big, expressive eyes, and for a moment, I saw a flash of something that made my heart skip a beat. It was gratitude, but there was something else there too, a hint of something deeper. She nodded, and we stumbled back to my place, the world a little blurrier than usual.
Once we were inside, we both collapsed on the couch, still laughing and joking. The TV was on, but neither of us was really paying attention. The alcohol had loosened us up, and we were in that comfortable, in-between state where you’re half in the moment and half lost in your thoughts.
“Hey, do you have a T-shirt I can borrow?” Kirsty asked, breaking the silence. “I didn’t bring anything to sleep in.”
“Sure,” I said, getting up and heading to my bedroom. I grabbed a long T-shirt, one that I hadn’t worn in ages, and brought it back to her. “This should do.”
She smiled and took it from me, disappearing into the bathroom to change. When she came out, the t-shirt hung loosely on her frame, reaching just to the top of her thighs. She looked different, more grown-up, and it hit me then how much she had changed. She was no longer the little girl I had grown up with; she was a beautiful, confident woman. My heart raced, and I felt a warmth in my chest that was more than just the effects of the beer.
As the night went on, the laughter faded, and Kirsty’s head eventually nodded forward. She had fallen asleep, her head resting on the arm of the couch, her lips slightly parted, and her chest rising and falling rhythmically. She looked so peaceful, so vulnerable, and I couldn’t help but feel a deep, protective urge. I had always seen Kirsty as more than just my little sister. She was my best friend, my confidante, and over the years, I had developed feelings for her that went beyond familial love. I tried to suppress these feelings, telling myself that they were wrong and that I couldn’t possibly feel that way about her. But no matter how hard I tried, I couldn’t shake them.
I got up, careful not to wake her, and stood in front of her, looking down at her sleeping form. I felt a surge of desire wash over me, and I knew that I couldn’t resist any longer.
I looked at her she was asleep from all the beers we had drunk. Her legs looked so good and I was starting to get hard. I shouldn’t have felt like this it was wrong, but I couldn’t help it.
I got up and gently pulled her to the edge of the couch, I slowly lifted her t-shirt a little. She had black panties on which I pulled aside to see her clean-shaven pussy. It looked so good.
I leaned in and kissed it, I started to lick her labia and sink my tongue inside her pussy. She let out a little whimper but was still asleep.
I gently pulled my jogging bottoms down and boxers just past my balls as I pulled her further to the edge of the couch. I was now pressing my cock against her pussy lips as I slowly sank it inside her.
I slowly slid in and out as I looked down at her pussy taking my cock as I slowly fucked her. The way her pussy moved and how easily she took my cock.
Suddenly her eyes half opened as she let out a moan, “Ah… ahh, w-what are… oh my g… your fucking me.”
I stopped thrusting, feeling embarrassed and guilty. But then Kirsty moaned again, her hips bucking against me.
“Don’t stop now,” she whispered, her voice pleading and desperate. “It felt… oh God, it felt so good…”
“Are you sure?” I asked, my voice barely above a whisper.
She nodded, her eyes never leaving mine. “Yes,” she replied, her voice steady and sure.
Her words shattered the last of my willpower. With a guttural groan, I began to start to slide out and back into her, my cock pulsing and throbbing as I resumed my slow, deliberate rhythm.
I gripped her thighs tighter, angling them further apart, and began to thrust with more purpose, my cock sliding in and out of her slick, warm pussy with ease.
“Fuck, you feel so good,” I groaned, my voice strained with pleasure. Kirsty let out a whimper, her nails digging into my shoulders as I picked up the pace.
“Ah, yes, just like that,” Kirsty gasped, her hips meeting mine with each powerful stroke. “Don’t stop, oh fuck, don’t stop. Please Mark oh shit… harder ahhhh.”
“Oh shit, Mark, yes!” Kirsty cried out, her back arching off the couch as I pounded into her. “Harder, fuck me harder!”
I grunted, my balls slapping against her clit with every brutal pump of my hips. Sweat dripped down my chest as I ravaged her, the couch creaking beneath us.
“Ah, shit, Kirsty… you’re so fucking tight,” I gasped, my hips snapping forward with renewed vigor. “Your pussy feels amazing around my cock…”
Kirsty let out a wanton cry, her nails raking down my back as I unleashed a flurry of powerful strokes, each one driving me closer to the edge. Her wet heat enveloped me like a velvet vice, milking my cock with every pump of my groin.
“Yes, yes, just like that… oh fuck, Mark, I’m so close!” Kirsty panted, her body tensing beneath me.
Feeling her impending orgasm, I slipped a hand between our sweat-slicked bodies to find her clit. I rubbed the sensitive nub in firm, circular motions, determined to make her come undone beneath me.
“Come on, sis… let it all out for me,” I groaned, my own climax building at the base of my spine. “Scream my name when you cum, Kirsty…”
With a ragged sob, Kirsty’s whole body convulsed, her pussy clamping down on my cock like a vice as she came hard. “MARK! OH GOD, I’M CUMMING! AHHHHH!” she screamed, her voice hoarse with ecstasy.
The feel of her spasming around me sent me over the edge. With a guttural roar, I slammed into her one final time, my cock throbbing and pulsing as I filled her with my hot, sticky seed.
“Fuck, Kirsty… take it all, my cum’s inside you,” I grunted, my body shuddering with the force of my orgasm.
As we both rode out the aftershocks, I collapsed on top of her, my weight pressing her into the couch. I couldn’t meet her gaze, too overcome with guilt and shame for what we had just done.
After a long moment, I finally pulled out of her, my softening cock slipping free with a wet pop. Kirsty let out a whimper of loss as I withdrew, her pussy still sensitive and slick from our intense coupling.
Neither of us moved or said a word for a while, just lying there in the aftermath of our forbidden lust. Eventually, Kirsty stirred, her hand coming up to brush a strand of hair from my forehead.
“Mark… I…” She trailed off, her voice barely a whisper. “That was… mmmm so good. I can’t believe you helped yourself to me.”
I winced at her words, a pang of regret stabbing through me. “Kirsty, we can’t… I shouldn’t have… this was a mistake.”
But Kirsty just shook her head, a suggestive smile playing on her lips. “No, Mark, it wasn’t a mistake. It was… perfect. We’ll just have to keep this our little secret, okay?”
I nodded, still reeling from the intensity of our encounter. As we cleaned up and settled in for the night, I couldn’t shake the feeling that nothing would ever be the same again between us. The line we had crossed had irrevocably changed the dynamics of our relationship, and I wasn’t sure if we could ever go back to the way things were before.