Skip to content I was on my way home after spending the afternoon with my girlfriend. When I walked in, I noticed my sister’s shoes in the foyer. I could’ve sworn she said she’d be out for the day.
We were on friendly terms and always had been. Our relationship was close. We’d sometimes play-fight like typical siblings, but as her older brother, I’d always been there for her. Even when she hit puberty, she’d come to me with some intimate questions. I never minded answering them, and neither did our mom.
I was twenty-one. She was nineteen. From what I knew, she’d never had a boyfriend and was a little shy when it came to relationships.
As I reached the stairs, I heard voices coming from her room. At first, it sounded like she was talking to herself, and it made me grin. A perfect chance to tease her, I thought.
I started up the stairs slowly and quietly. But the closer I got, the more I realized she wasn’t talking.
Instead, I heard soft, obscene slurping and sucking sounds, wet, arousing noises that made blood flow straight south. It sounded like she was giving someone head.
The realization hit me hard. I froze for a second, and my cock kept awkwardly stiffening. I’d never heard anything like that from her before, and for some reason, it made me excited.
I crept up, careful not to let the stairs creak under my weight. The door to her room was slightly ajar, just enough to offer a sliver of a view.
I leaned in, peeking through the gap.
There she was, lying on her stomach across the bed, a pair of pink Hello Kitty panties riding up slightly, hugging the mounds of her soft ass. Her bra matched, white with little hearts, which barely covered her two, young breasts. Her chestnut hair spilled over one shoulder in soft waves, and her glasses framed her face in a way that made her look like one of those naughty student fantasies brought to life. She had that bookish, innocent vibe… but with a body and action that said otherwise.
My eyes traced the curve of her back, down to the swell of her hips and that impossibly bubbly ass. Her skin was flawless, porcelain smooth like she’d never stepped into the sun for more than a second. But then I noticed what she was doing.
She was lying in front of her laptop, lips wrapped around a dildo, soft slurping noises filling the room, the same ones I’d heard from the hallway. On the screen, a woman was giving a slow, sensual blowjob, narrating her technique like it was an educational video.
And my sister … She was mimicking it.
Her head bobbed gently, her cheeks hollowing with effort, eyes focused on the screen like she was studying for finals. Her lips were painted in an erotic red color, which surprised me since I’d never seen her with lipstick either, and her lips stretched like rubber bands around the dildo as she slowly eased it into her mouth.
The realization hit me. She wasn’t just experimenting. She was trying to learn how to please someone. And the way she moved … It wasn’t awkward. It was hot … way too hot.
Suddenly, a drop of sweat ran down the side of my head, and I hadn’t even realized it, but I had pitched a full-blown tent that was about to burst through the zipper.
I knew I shouldn’t be watching this. But I couldn’t tear myself away. It wasn’t that long ago I’d woken up from a wet dream when I’d made love to her. It had made me ashamed of myself, but now it felt a bit different.
She adjusted her grip on the dildo, holding it at the base with one hand while her lips slid slowly down the shaft. She licked up the sides first, long, careful strokes of her young, rosy tongue, just like the tutorial showed, before bringing it to her mouth again. This time, she took it deeper.
A soft gagging noise escaped her as she pushed it farther. She coughed spit all over her hand and a tear leaked from her eye, then she pulled back with a gasp, biting her lower lip. She wiped her mouth, refocused, and tried again, desperate to master the art of deepthroat.
My rock-hard cock stirred in my jeans. She was so focused, so eager to get it right. Her cheeks were flushed, her breath coming in short little puffs. She let out a small moan, and it damn near unraveled me.
I knew it. Every second I stayed there, watching, made it worse. But my body wasn’t listening. I could feel the drop of precum gathering at the tip, painfully aware of how aroused I’d become.
She dipped her head again, licking along the underside now, then swirling her tongue around the tip. Her lips parted, welcoming the toy with a soft wet sound as she eased it back into her mouth.
God… she’s so sexy.
She pushed her glasses up and had a horny look on her face, one I’d never seen before. Then she snaked her hand down to her panties, her eyes widening. “Gosh, my kitty is all wet,” she said. And with a grin, she turned around, pulled her panties aside, and eased the dildo inside her. I couldn’t see her pussy from this angle, but I could pick up the scent of her musky flavors. She threw her head back and enjoyed every second of it.
“Why am I masturbating… I should be studying,” she said to herself playfully.
She slipped the dildo out, now drenched in her pink juices, and licked up every trail of her pussy nectar.
I became so painfully hard that I shifted, and the floor squeaked. Her head snapped immediately toward me, and I looked like a deer caught in the headlights.
“Sofi, I’m so sorry,” I told her.
A rosy blush covered her cheeks, and we just stared at each other.
“Just kill me now,” she said in her cute, innocent voice.
“I’ll just … close the door,” I said awkwardly. I did and went back to my bedroom.
I didn’t stay there long.
I felt awful, especially after seeing her blush. But worst of all, my erection hadn’t gone down. It was still hard. Uncomfortably hard.
Still, I was the older brother. I knew I had to talk to her. I owed her a proper apology for walking in on her like that.
I hesitated at my door for a long moment, still unsure if I should go back. But the guilt sat heavy in my chest, and I knew I couldn’t just let it slide. So I made my way down the hall and knocked on her door.
“Come in,” she called, her voice light and casual, completely different from earlier.
I stepped inside. She was dressed now, sitting on her bed with her back against the wall, her knees drawn up to her breasts in a cute pose. She wore a tiny skirt and a fitted top that clung to her chest. Her hair was still slightly tousled, and the glasses rested perfectly on her nose. Thankfully, the blush was gone.
My eyes dropped, just for a second, and I caught a glimpse between her legs. Her panties were visible beneath the hem of her skirt, and in the center was a damp, obvious patch of fresh feminine arousal. I had to I force my eyes back up to hers, reminding myself why I was there.
“I’m really sorry,” I said, stepping further in. “I shouldn’t have watched. That was inappropriate.”
She gave me a cute smile, showing off the apples on her porcelain cheeks. “I’m glad you apologized. That’s sweet of you.”
I nodded, about to turn away, but she continued.
“But … I’m kind of glad you walked in.”
That stopped me. “Wait, what?”
She shifted slightly, resting her chin on her knees. “I mean it. I’ve been feeling insecure lately. I’m in college and still a virgin, and … I don’t know. I’ve been watching those tutorials because I want to be good when the time comes.”
I listened, trying to process that. “I get it,” I said eventually. “It’s normal to want to be prepared. But … Why were you glad I saw you?”
She looked away for a second, then back at me with a shy little smile. “Because it felt nice to be seen,” she said. “To be wanted. And … I noticed how hard you were.”
My face flushed with heat. “Sofi…”
She bit her lip, nervous now, but she didn’t stop. “I was thinking,” she said softly. “would you let me practice on you?”
“Sofi, you’re my little sister. That’s incest.”
“And? No one has to find out.”
“Doesn’t it gross you out?”
“No,” she said firmly. “I like you.”
“I’m not sure. I don’t think that’s a good idea.”
She tilted her head. “Why not? You already saw everything. And it’s not like I’d tell anyone.”
“But we shouldn’t mess around with each other.”
Sofi tilted her head, looking at me like she already had a counter-argument ready. “But we’ve always been close. Haven’t we?”
I didn’t say anything. I couldn’t believe we were having this conversation.
She went on, “Remember when I knitted that sweater for your girlfriend last Christmas? You told me you owed me something special for that.”
Damn. She had a point. I remembered that moment clearly, how happy she’d looked when I said it. At the time, it was just a promise to make her smile.
I looked at her lips, the gloss still faintly shimmering on them, and my mind drifted back to what I’d seen earlier, her mouth, her tongue and the obscene, erotic sounds she made as she deepthroated that thick dildo.
I forced the memory away.
“Sis, I love you, but I still don’t think it’s right,” I muttered.
Sofi didn’t press. Instead, she smiled sweetly and said, “Okay. I don’t want to make you uncomfortable, but can I at least show you? Just me practicing with the dildo again. You can tell me if I look hot. That’s all.”
I hesitated, then slowly nodded. “Alright.”
Beaming, she reached into her drawer, pulled out the same dildo from before, and walked back over to the bed. Sitting down again, she brought her knees up, resting the toy on her thighs for a moment. Then, locking eyes with me, she leaned down and slowly wrapped her lips around it. It was just like before, but now, it was intentional, and most importantly, just for me.
She sucked slowly, her eyes staying on mine. Her tongue swirled around the head before taking it deeper, lips parting wetly. She bobbed her head just like they did on porn, which I assumed she’d watched a lot of. Soft little slurps filled the room. She had to readjust her glasses a couple of times as they slowly slid down her cute, buttoned nose, but then she aimed her blue eyes at me as she gagged on the dildo, reaching the back of her throat.
“That turns me on,” I admitted, watching her. “The way you look me in the eyes.” I had never felt such a heat before, and once again, my cock thickened right before her eyes.
My little sister pulled back slightly, licking the shaft. “Is it better if I show my tits?” she asked. “Do guys really care about tits during this?”
I nodded. “Yeah. Most do. But you don’t have to show me.”
She giggled. “I don’t mind,” she said. She pulled off her tops, revealing her toned tummy. Then she reached behind her back and unhooked her bra. It slipped forward and dropped, revealing her perky, nude breasts.
They were perfect, small, perky mounds that seemed to defy gravity, topped with rosy pink nipples that had hardened in the cool air of her bedroom. The areolas were pink like cherry blossoms in spring, forming perfect circles around her nipples. Though modest in size, they had a firmness that spoke of her young adulthood, the kind of natural perfection that no plastic surgeon could ever replicate, and then it was the valley between them, the perfect, natural cleavage I’d seen in my life.
“What do you think?” she asked, a hint of vulnerability in her voice.
I swallowed hard, unable to tear my eyes away. “They’re beautiful, Sofi.”
She gave her breasts a proud, playful lift, before dropping them, and I saw them jiggle till they found equilibrium.
My cock throbbed in my pants. I was rock hard.
She went back to sucking the dildo, slow and wet, letting her breasts softly jiggle with each suck and gag. She was teasing me, and she knew exactly what she was doing.
My balls were cramping up, and for a second, I didn’t give a damn about cultural norms. “Maybe…” I began, barely recognizing my own voice. “Maybe you could practice on me instead.”
She pulled the dildo out with a wet pop and beamed, crawling forward to hug me tightly.
“You’re the best brother in the world,” she whispered, pressing her cheek against my chest, her tits mashing against me.
“You’re welcome … but we should hurry before Mom comes home.”
Dropping to her knees, Sofi leaned in, her fingers brushing over the front of my jeans. She slowly reached for the zipper, eyes full of curiosity and mischief. She began to tug it down, her hand moving to wrap around the bulge beneath.
And that’s when we heard it.
The front door opened, followed by the unmistakable voice of our mom. “Sofi? Markus? I’m home!”
We both froze.
“Fuck,” I muttered, scrambling to zip myself back up.
Sofi jerked upright, smoothing her skirt and grabbing her bra from the floor. Then she leaned in with a whisper. “Can we… continue tomorrow?”
I nodded quickly. “Yeah, that’s fine.”
As she stood to fix her top, she paused and turned back to me. “One more thing…”
“Yeah?”
“Don’t masturbate tonight,” she said with a grin. “I want you hard for me.”
I blinked, stunned by her words.
“I mean it,” she added playfully, biting her lip. “Promise?”
I exhaled, running a hand through my hair. “Alright. I promise.”
She smiled like she’d just won something and gave me a playful wink before I headed for her door.
I slipped out and went back to my room, still painfully hard, balls blue, stunned and already counting down the hours until tomorrow.
*****
The next day, we met in Sofi’s bedroom again. As soon as I stepped inside and closed the door, I was already aroused. I didn’t even have to say a word—my erection was pressing painfully against my jeans, and I could feel the wet spot of precum at the tip.
Sofi noticed right away and gave me a smug little smile. She was dressed in the same kind of outfit as yesterday, a short, fitted crop top that showed a sliver of her soft stomach, and a pleated mini skirt that barely covered her thighs. Her chestnut hair was pulled into a loose ponytail, a few strands framing her face. Her glasses were still on, giving her that sexy, smart-girl vibe that made her look both innocent and coquettish. Her lips were painted a glossy pink, and I couldn’t stop imagining them wrapped around me.
She leaned back on one foot, twisting slightly, and asked with a coy tone, “Do you like lipstick?”
I nodded. “Yeah. Especially when it’s smudged.”
That made her giggle.
“What about clothes? What’s sexy to you?”
I glanced at her outfit and gave a half-smile. “What you’re wearing right now. Casual, like you’re not even trying.”
She beamed, clearly pleased. “Where do you want me?”
“On your knees,” I said.
She moved down slowly, settling between my legs, the skirt riding up just enough to show the curve of her thighs. She looked up at me through her glasses, lips slightly parted, and reached for my zipper.
Eventually, she freed my cock, which sprang free, already slick with precum.
She hesitated for a second, eyes wide, then reached out and wrapped her fingers around it.
I let out a quiet breath. “Start slow. Use your tongue first.”
Nodding, she leaned forward, licking up along the underside of my shaft, letting her tongue trace every vein. Once her tongue had touched my shaft, I knew we had crossed a significant line, and we were at the point of no return. I did nothing to fight it. I wanted more of that forbidden thrill.
She swirled her rosy tongue around the tip like a French kiss, tasting the precum as if curious about the flavor.
“Yeah … just like that,” I murmured, my hand gently resting on her head.
She began to suck, lips wrapping around the head as she eased me into her mouth, inch by inch. Her cheeks hollowed slightly with each bob of her head, and her hands moved to grip my thighs for support.
“Look up at me while you do it,” I said, voice husky and low. “That’s a huge turn-on.”
She did, and something about that look, her wide eyes and glossy lips wrapped around my cock, nearly made my knees buckle.
“Use your hand too,” I told her. “Just twist a little while you suck.”
She followed my guidance, stroking with one hand as her mouth worked me over, and the pleasure shot through my body like lightning. It was insanely hot and unbelievable.
“God, Sofi…” I groaned. “You’re doing so good.”
And she smiled around me, proud of every inch she took.
Her confidence grew with each throat stroke. Her sexy mouth formed into the perfect oral vagina. She took me deeper, letting me hit the back of her throat, gagging slightly but pushing through it like a champion. The wet sounds of her mouth filled the room as saliva dripped down my shaft.
“Fuck, sis,” I moaned, cradling her head with my hands. “You’re a natural at this.”
She hummed around my cock, sending vibrations through me that made my toes curl. She came off my dripping cock, stroking it with her left hand. “I’ve been practicing for months,” she said. And then her tongue worked the underside while her hand twisted at the base, creating friction that had me teetering on the edge.
“You’re such a good girl … a dream girl.”
She beamed in joy and swallowed my shaft again.
“I’m getting close,” I warned her, my fingers tangling in her chestnut hair.
She pulled back suddenly, my cock slipping from her lips with a wet pop. A strand of saliva connected her lower lip to my tip.
“Wait,” she said, catching her breath. Her lipstick was smeared, glasses were slightly askew. “When you finish… should I swallow it or spit it out?” She asked it so innocently like a student wanting to get the answer right on a test.
I groaned at the thought. “Swallowing is definitely hotter,” I admitted. “But you don’t have to.”
Her eyes lit up. “Really? So guys prefer that?” She tilted her head, considering. “Then that’s what I want to do.”
“Are you sure?” I asked, barely able to form words through the haze of lust.
“I’m positive,” she nodded, adjusting her glasses. “I want the full experience.”
“Okay.”
“Oh silly me, she said and shook her head. “I forgot to free my titties.” She took off her top and unhooked her bra, freeing her gorgeous, perky breasts. My little sister innocently looked up at me from her knees. “I thought guys liked to touch boobs?”
I reached down to grope her breasts. Her breasts felt like heaven in my hands, soft yet firm, with a weight that defied their modest size. As my palms cupped them, her flesh yielded beneath my touch, so warm and smooth.
“Oh,” she gasped, her eyes fluttering closed for a moment.
I squeezed gently, marveling at how perfectly they fit in my hands, how the rosy tips seemed to blush darker as I rolled them between my fingers. Her skin was like silk, unmarked by tan lines or age. “Should I suck you while you touch me?”
“Sure, but don’t stop if I let go of your tits.”
She took me back into her mouth, more eager than before, determined to bring me to climax and suck the buttermilk out of the tip. She cupped my balls gently with her free hand, massaging them as she slid my shaft over her tongue.
I couldn’t hold onto her tits any longer. It just felt so damn good.
“Sofi, I’m gonna—” I couldn’t finish the sentence. My hips bucked forward involuntarily as the most intense, forbidden pleasure overwhelmed me and made me see stars.
The first spurt hit the back of her throat, and I watched her eyes widen in surprise. But she didn’t pull away. Instead, she kept her lips sealed around me, as the rest of my cum flooded her mouth in one big wave. I leaned back and moaned, the pleasure feeling like it lasted for an eternity as she continued to milk my orgasm by lightly sucking the crown.
“Geeze, sis,” I said, looking down at her. She was still looking up at me from her knees, still lightly sucking the tip and drawing out the last drops.
When I was dry, she slowly pulled back, licking her lips to catch any stray drops. There was something triumphant in her expression like she’d just conquered a mountain.
“Was that good?” she asked, her voice slightly hoarse.
I collapsed back onto her bed, breathing hard. “That felt like heaven,” I said. “You’re talented.”
Sofi crawled up beside me, her satisfied smile softening into something sweeter. “It tasted different than I expected,” she said thoughtfully. “Not bad, just… unique.” She rested her head on my chest. “I liked it, though. Making you feel good.”
I wrapped an arm around her, pulling her a little closer. Despite everything we’d just done, I felt oddly calm.
“Sofi,” I said, glancing down at her, “I can promise you one thing—you don’t have to be insecure about your oral skills. You definitely know how to suck a cock.”
She laughed against my chest. “Good,” she said. “Because I liked doing it for you. A lot.” She kissed my cheek. “Thank you for being a good brother.”
“And thank you for being a good sister.”
The end.
Want to read part 2? Click here: Brother Teaches Little Sister Sex
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