Stepbrother's unfair advantage

If you ever want to understand true mental agony, try coming home sore as hell from a two-hour gym session, expecting peace and protein powder, and instead hearing your stepsister on the back deck, announcing to the world that you’re packing a monster stepbro cock. Extra points if you know for a fact that the only other person in earshot is your neighbor.

I should have taken the side entrance. My mind, fried from squats, defaulted to autopilot and walked me straight into earshot.

Dumping my bag on the stairs, I went to the kitchen, bracing myself on the island. I chugged half a bottle of water, sweat still slick on my back and heard Kyla’s giggle cut through the glass. “I’m dead serious,” she said, voice escalating to her full valley-girl squeal. “Like, I legit thought it was fake at first. It’s that big. He doesn’t even try to hide it around here.”

She was on the phone, probably talking to one of her slutty friends. My face burned hot, not from embarrassment but the way it made my blood surge. Kyla had been ramping up the sexual tension for months, every week a new escalation. First it was the braless tank tops, then the micro-shorts that left nothing to the imagination. If you caught her sprawled on the couch, the odds were fifty-fifty she’d have a hand down her waistband. She narrated her own masturbation sessions with the bathroom door open, then acted like it was my fault for having good hearing.

None of this would have been an issue if we weren’t alone together. Our parents were on vacation in Miami, and neither of us was the type to FaceTime for family dinners. I started college this year, she was a sophomore, and it didn’t take long for the boundaries to blur, especially after the shower incident.

It was a Wednesday night. I’d just finished leg day and couldn’t lift my arms above my head. I went for a late shower, beat, and there was a knock. She said she needed her conditioner. I figured she’d take the hint and wait for me to finish. Nope, Kyla strolled in, eyes locked on my cock with an unabashed curiosity that didn’t fit with the just step-siblings act she played at dinner. The glass shower door was fogged, but not enough. I was, in that moment, somewhere between flaccid and not, and she stared so openly I almost laughed. Instead, I finished what I was doing, yes, that, and watched her reflection in the vanity mirror as she pretended to rummage for hair products. She caught me watching her, and, honest to god, licked her lips. When I came out in a towel, she was still in the bathroom, sitting on the counter, twirling her hair. She didn’t mention it, ever, but her behavior since had gotten nuclear.

So, yeah. Now I was stuck in the kitchen, listening to her give a TED talk about my huge cock. If I had any sense, I’d go straight upstairs, lock my door and jack off to get it out of my system. I reached into the fridge, grabbed a yogurt and tried to ignore her laugh. She padded in from the back deck. She wore a cropped blue t-shirt that clung to her tits and a skirt that was more of a suggestion than a garment. No bra, per usual. The outline of her nipples showed, hard and blatant. Her hair was wet, dark chestnut, pooling over her shoulder and grazing her tits like a curtain. If you took a composite of every Instagram model on the explore page, that was Kyla: skin like warm gold, thighs pressed together to make her ass pop and eyes way too big and pretty for someone with zero impulse control.

She paused when she saw me, cocked her hip, and gave a slow, deliberate up-and-down with her gaze that made my neck prickle.

“Eavesdrop much?” she said, eyes narrowed in fake suspicion.

“You weren’t exactly quiet,” I said, forcing my focus to the yogurt. “Also, why do you keep telling people about my dick? You realize how weird that is, right?”

She smiled, not a bit ashamed. “I only say it to people who’ll appreciate the info.”

“Appreciate?”

Kyla shrugged. “You know, my friends. Lizzie and Layla. Don’t act like it’s a burden. You like the attention.”

She closed the fridge, her body wedging into my space until her bare arm brushed against mine. I noticed for the first time that she had goosebumps, though the house wasn’t cold.

“I’m not even mad,” she said. “I just want to see if it’s as huge as it looked that time. You were all wet and I didn’t get a good look.”

My mind stuttered. “You’re high.”

“Maybe,” she said, but she didn’t look away. Instead, she stuck her tongue between her teeth and tipped her head, waiting. When I didn’t flinch, she stepped back and propped herself on the counter, legs splayed a little. I could see the flash of pale skin where her skirt hiked up her thigh. I told myself not to look, but the glance was automatic.

Kyla caught it and grinned. “Just let me see, for science.”

“Not happening,” I said. “Go take a cold shower or something.”

She made a pout that would have been more convincing if not for the smirk at the edge of her lips. “So mean,” she said. “I’ll let you see my tits, if that’s fair. You’re always pretending you’re above it, but I see the way you look.”

“Did it ever occur to you that maybe my brain isn’t porn-damaged?” I said. “I’m not interested.”

She fake-gasped. “Liar. You literally jerked off while staring at my tits yesterday.”

That was true, but not something I’d ever admit. Instead, I took a step toward the stairs, hoping she’d drop it. She blocked my path with one leg, bare foot flexed against the tile.

“Just one peek,” she said, voice dropping lower. “I’ll never ask again.”

A smarter man would have walked away. Instead, I found myself caught in the gravity of her stare. I remembered the way she’d stared at my cock in the shower, how her lips parted when she thought I wasn’t looking. I thought about the last six months, how every day with her felt like a dare.

I exhaled. “Fine. You get two seconds. Then you fuck off.”

Her whole face brightened, like a kid on Christmas. “Deal.”

I dropped my gym shorts, half-expecting her to giggle or act scandalized. She didn’t. She stared, eyes wide, and reached out without asking. Her hand curled around the base and squeezed, testing the weight like it was a science experiment. I was only half-hard, but it looked obscene in her small hand.

“Jesus,” she said, as my manhood cast a thick shadow over her face. “That’s like a weapon.”

I tried to cover the urge to swell up in her grip, but failed. My cock twitched, getting fuller and she gave a short, awed laugh.

“You can let go now.”

She ignored me, fingers tracing the length. She leaned in so close that her hair brushed my abs. I could see the line of her tits through the shirt, nipples hard as glass.

“Can I…” she started, but didn’t finish. She brought her lips to the tip and flicked her tongue over it, quick and almost shy, then looked up at me for a reaction.

I blinked, speechless. “Only if you let me see your tits.”

“I knew you’d let me,” she said. “Guys are so easy.”

The truth is, I wanted her to keep going. I wanted her to wrap her mouth around it and swallow me whole, right there in the kitchen. But I played it cool, feigning disgust. “You’re seriously fucking mental,” I said, but made no move to pull away.

She grinned, then let go, hand sliding off slow, like she wanted to savor it.

“Your turn,” I said, reminding her of the deal.

She yanked her shirt off, no ceremony. Her tits were even better than I’d pictured: big, natural, heavy but perky, with small pink nipples set high. They bounced, then settled, the skin faintly pink from the air.

“Touch them,” she said, pushing her chest toward me.

I reached out, more curious than horny at that point and cupped one. It was hot and soft, the nipple pebbled and tight. I squeezed, then rolled the nipple between thumb and forefinger. She gasped, louder than she probably meant.

“Told you they’re real,” she said, and there was something smug in her smile.

“Congrats. You win,” I said, giving her tit a squeeze.

“Now, it’s my turn again,” she said happily. She knelt, bare knees on the kitchen floor, and looked up at me like a porn star. There was no stopping her. She wrapped her lips around the head and sucked, tongue circling the ridge. She moaned, eyes shut and bobbed her head, taking more each time. I leaned against the counter, watching her. Her hair slipped over her shoulders and fanned across my thighs, and when she gripped the base, she stroked in time with her mouth. She was sloppy, noisy and not trying to hide how much she liked it.

I couldn’t stop the noises that came out of me. She took it as encouragement and went faster, spit dribbling down her chin and onto her tits.

She popped off to breathe, mouth open and tongue out like she wanted to show off. Strings of spit connected her lips to the head of my cock, glistening in the kitchen light. My shaft was thick and veined, flushed dark, the head swollen and slick from her mouth. Even half-hard, it had looked big; now fully erect, it was obscene: long, heavy, the kind of cock that made her eyes widen again when she looked at it.

Kyla wrapped both hands around the base, fingers not quite meeting, and stroked upward while her tongue flicked the underside. She moaned around the head when she took it back in, the vibration shooting straight through me. Her lips stretched wide to accommodate the girth, corners pulling taut and cheeks hollowing as she sucked hard. She bobbed slowly at first, letting her tongue swirl around the ridge, then faster, taking more each time until the head bumped the back of her throat.

She gagged softly but didn’t pull off. Instead, she pushed forward, eyes watering, until her nose brushed my pubes. My cock disappeared completely into her mouth, lips stretched thin around the base, throat working around me. The sight was unreal: her pretty face buried in my crotch, cheeks flushed and spit dripping down her chin onto her bare tits. She hummed, the sound vibrating through my shaft, and I groaned, hands fisting in her chestnut hair.

“Fuck, Kyla…”

She pulled back slowly, lips dragging along every inch, leaving my cock shiny and throbbing. A thick string of spit connected her mouth to the tip when she popped off again. She grinned, wiping her chin with the back of her hand. “You taste good,” she said, voice hoarse. “I want all of it.”

She dove back in, sucking harder now, one hand stroking the base in tight twists while the other cupped my balls, rolling them gently. Her head moved in a steady rhythm. She moaned around me, the sound wet and needy, and the vibration pushed me closer. My hips bucked involuntarily, fucking her mouth in shallow thrusts. She took it eagerly, gagging softly but never slowing down.

I felt the pressure build fast, balls tightening and heat coiling low in my gut. “I’m gonna come so hard.”

She didn’t pull off. Instead she sucked harder, tongue pressing flat against the underside and hands stroking faster. Her eyes locked on mine, wide and eager, begging for it.

I lost it. My cock pulsed hard, swelling in her mouth, and I came with a groan that echoed in the quiet kitchen. Thick spurts shot across her tongue, filling her mouth. She moaned around me, swallowing greedily, but there was too much; cum leaked from the corners of her lips, dripping down her chin onto her tits. I kept coming, wave after wave, hips jerking as she milked me dry with her mouth and hands.

When the pulses finally slowed, she pulled off slowly, lips stretched and shiny, a thick strand of cum and spit connecting her mouth to the head. She giggled as more cum dribbled down her chin.

“Jesus,” she said, wiping her mouth with the back of her hand. “That’s a lot.”

She licked her lips, tasting the last of it, eyes sparkling. “Best creampie I’ve ever had… and it wasn’t even in my pussy.”

I collapsed back against the counter, legs shaky, heart hammering. She stood, tits still glistening with spit and cum, and pressed against me, kissing me deep so I could taste myself on her tongue.

“Next time,” she whispered, “I want it somewhere else.”

I laughed, still a little dizzy. “You’re a fucking menace.”

She pressed her tits against my chest. “You love it,” she whispered. “Don’t pretend.”

I did. I wanted to do it again, immediately, but I’d be damned if I gave her the satisfaction. I pulled her shirt back over her head, then grabbed my shorts off the floor.

“You need boundaries,” I said.

Kyla rolled her eyes. “You need to stop blue-balling yourself. Next time I want to feel it inside me.”

I gave her a look.

“Just saying,” she said, heading up the stairs. Her ass, barely covered by her skirt, was hypnotic.

I stayed in the kitchen, replaying everything. The taste of her mouth, the sound of her moan, the way she swallowed every drop and wanted more. I told myself it couldn’t happen again. But I knew she’d get her way. She always did.