Man, I never thought I'd be in this spot, but here I am, my heart pounding like crazy as my little sister Mia climbs on top of me. I'm Alex, 19, and she's 18, all curves and innocence with that tight body she's been hiding under baggy clothes.
Her boyfriend's some douche who doesn't know how to treat her right, and she came to me last week, all blushy and whispering, ''Alex, can you teach me how to ride a guy? I wanna make Jake happy, but I'm scared I'll mess up.''
I said yes without thinking, but now, in my room with the door locked, my dick's throbbing so hard it fucking hurts. She's naked, her perky tits bouncing a little as she straddles my hips, her shaved pussy lips brushing my bare cock. I'm rock hard, veins pulsating like it's begging to slide into her.
"Okay, Mia,'' I say, my voice all rough and teen-horny, grabbing her hips with my hands. They're soft, warm, and I squeeze hard, feeling her skin give under my fingers.
God, I want to devour her. ''Cowgirl's easy. You just sit on my dick like this. Line it up with your pussy."
She nods, biting her lip, her long brown hair falling over her shoulders. She's nervous, but her eyes are lit up with that mix of fear and excitement. I guide her down gently, the head of my cock poking her wet hole. She's soaked already, probably from the way I stared at her while she stripped.
"Yeah, just like that. Push down. Feel how it throbs because you? You're a good girl."
She gasps as the tip pops in, her tight virgin walls—wait, no, she's not a virgin anymore, but damn, she feels like one gripping me.
''Oh fuck, Alex..." she whimpers, sinking lower.
Slowly, she takes me, her pussy sucking me in like a hot, velvety glove. I groan loudly, my head falling back on the pillow.
Holy shit, this is better than any porn I've jerked to. My sister's riding my cock, and it feels like heaven and hell mixed. I thrust up a little, making her yelp.
"Ah, no! Wait, Alex. Teach me first, you pervert."
''Sorry,'' I mutter, but I'm grinning, my hands sliding up to her waist, then higher to cup her tits.
They're perfect handfuls, nipples hard as pebbles. I pinch one, rolling it between my fingers, and she moans, starting to rock her hips.
''Alright, listen up. In cowgirl, you control it. Bounce up and down, or grind like this—''
I buck my hips to show her, my cock slamming deeper. She cries out, her juices dripping down my balls. Fuck, I'm so hungry for her flesh, I wanna bite into those thighs, her tits. Every part of her slutty teen body.
"Grind your clit on me. Feel that? That's gonna make you cum hard for your boyfriend."
Mia's getting into it now, her hands on my chest for balance, nails digging in as she lifts up and drops down. Slap, slap—the sound of her ass hitting my thighs echoes in the room. Her pussy's clenching around me, milking my shaft with every move.
I can't help it; I play with her body like it's my toy. One hand kneads her ass cheek, spreading it to watch my cock disappear into her pink hole. "Damn, your ass is so fucking juicy. Squeeze it around me. Oh... yeah, like that.''
She does, and I nearly lose it, my dick throbbing inside her. The other hand's on her tit, sucking it into my mouth now that she's leaning forward. I latch on, tongue flicking her nipple, then sucking it hard enough to make her shudder. "You taste so good, sis. Ride me faster. Ride me like a slut. Show me what you got."
She's panting, her face all flushed and sexy. "Like this, Alex? Am I doing it right?" She bounces harder, her tits jiggling in my face.
I nod, thrusting up to meet her, our bodies slapping together wet and loud. My mind's a haze of lust. Fuck her boyfriend, this is all for me. I want to bury myself in her forever, feel every ripple of her insides hugging my cock.
"Hell yeah, you're a natural. Twist your hips. Grind that tiny little pussy on my base. You're doing so good, baby. That's gonna drive your boyfriend wild."
But shit, it's too much. Her walls are twitching, squeezing me tighter, and I can feel my balls tightening, the pleasure building like a volcano.
We're fucking raw, no condom, and it's risky as hell. "Baby, wait—get off," I gasp, my voice cracking like the horny teen I am. ''I'm gonna cum. Pull up, sis!''
I try to lift her off, but she shakes her head, eyes wild, and grabs my wrists, pinning them down above my head. Her small hands are surprisingly strong, or maybe I'm just too lost in the heat to fight back hard. It feels so damn good.
"No! Just a little more. Just a bit more. I wanna feel it," she whines, riding me faster, her pussy slamming down, taking me balls deep. Her tits bounce wildly, and she leans in, her breath hot on my neck. "Please, bro, don't stop me. It feels too good. Fuck me. Fuck me, Alex. Fuck your little sister's pussy."
"Holy shit. Fuck—let go! I can't hold it!'' I beg, though I'm not really doing anything to get away. I love how rapey she gets because of her big brother's cock. My cock's throbbing, buried balls-deep in her sopping wet cunt, and she's grinding her clit on me, chasing her own high.
I'm dying here, my whole body is on fire. "Ah, please. I'm serious, get off me! You'll get pregnant or some shit!'' But my words are weak, mixed with groans, because deep down, part of me wants this. I want to explode inside her.
She ignores me, moaning louder, her pussy spasming as she cums first.
"Oh god, Alex. Yes! I'm cumming..." Her juices squirt out, soaking my groin, and that pushes me over.
I beg her one last time, "Mia, no. Let my hands go, fuck!"
But she holds firm, riding through it, and I shatter. My cock swells, pulsating like crazy, and I nut everything deep inside her. Warm baby batter explodes, painting her insides white, filling her up until it's gushing out around my shaft, dripping down my pumping balls. I groan, hips slamming uncontrollably, the sensation so intense it blacks out my vision for a second. Pure hentai-level ecstasy, my seed claiming her completely.
Finally, she lets go, collapsing on my chest, both of us panting. My cock's still twitching inside her, cum leaking everywhere.
"Shit... that was insane,'' I mutter, wrapping my arms around her sweaty body, too spent to care. She's giggling softly, nuzzling my neck.
"Thanks for the lesson, bro. Jake's gonna love it.'' But as I feel her warmth around me, I know this won't be the last time.