I tossed and turned in bed, the clock glaring 2 a.m. like it was mocking my insomnia. The house was dead quiet except for the occasional creak of settling wood. I slipped out from under the sheets in my yoga pants and crop top—no bra, because why bother when everyone was asleep—and padded barefoot to the kitchen for a glass of water. The cool tile felt good under my feet, and I savored the silence, my mind wandering to nothing in particular. That’s when I noticed Ryan’s door cracked open just enough for a sliver of light to spill into the hallway, accompanied by a rhythmic slapping sound and the faint squeak of bedsprings. Curiosity got the better of me; I crept closer, heart thumping with that mix of mischief and something hotter I wasn’t ready to name yet.
Peeking through the gap, I saw my twenty-year-old step-brother sprawled on his bed in gym shorts and a t-shirt, one hand working furiously over his hard cock. His slender frame was tense, short brown hair messy, and those quiet moans escaped like he was trying to stay hidden. “Fuck,” I whispered to myself, a smirk tugging at my lips. Ryan, the conflict-avoider, getting off like this? It was almost too perfect. I pushed the door open wider, leaning against the frame with my arms crossed under my C-cup tits, the crop top riding up to show a strip of skin. “Well, well, step-bro. Midnight workout session? Or just missing your stepsister’s tight bubble ass already?”
Ryan jolted upright, yanking his hand away, face flushing red. “Megan! Shit, what are you doing up? Close the door!” His voice was low, panicked, but his cock stayed hard, twitching against his shorts. I stepped inside, closing the door behind me with a soft click, my sarcasm dialed up. “Relax, little brother. It’s not like I haven’t seen a cock before. Though yours looks particularly needy tonight. Horny much? Or is the taboo of it all getting you off?” He stammered, trying to cover up, but I sauntered closer, feeling my pussy start to throb and get wet under the yoga pants. “Don’t be shy. I’m outgoing enough for both of us. Tell me, were you thinking about me while you stroked that hard dick?”
He swallowed hard, eyes flicking over my body—the way the crop top clung to my tits, nipples pebbling from the cool air and the sight before me. “Megan, this is wrong. You’re my step-sister. Jack’s your step-dad too, for fuck’s sake. We can’t…” But his words trailed off as I sat on the edge of the bed, one hand resting on his thigh. “Wrong? Or just the hottest thing you’ve jerked to? Praise kink much? You’re doing so well keeping quiet, but I bet you’d love it if I helped.” My fingers brushed his cock through the fabric, feeling it pulse. He groaned, and I grinned wickedly. “See? Already hard for me. Let’s make this free-use official—starting now.”
Ryan’s resistance melted under my touch as I tugged his shorts down, freeing his cock. It sprang up, thick and dripping pre-cum. “God, look at you, all sweaty and panting already,” I teased, wrapping my fingers around the base. “Such a good step-bro, letting your stepsister take charge.” I leaned in, tongue flicking the tip before sliding my lips over him in a slow, wet blowjob. He tasted salty, and I moaned around his length, sucking harder as my free hand slipped into my yoga pants to rub my swollen clit. “Mmm, your cock feels perfect in my mouth. Bet you’ve dreamed of this taboo shit.” Ryan’s hands found my hair, not pushing but gripping as he panted, “Fuck, Megan… your mouth is so hot. You’re so wet already, aren’t you? Dripping for your step-brother?”
I pulled off with a pop, standing to peel off my crop top and yoga pants, revealing my slim body, C-cup tits, and tight bubble ass. “Damn right I am. Now get those shorts off and fuck me like you mean it.” I climbed onto the bed, straddling him in reverse so he could watch my ass bounce. His cock slid into my dripping pussy with one thrust, filling me deep. We moved together, him gripping my hips as I rode him hard, my tits swaying. “Yes, just like that—praise me, step-bro. Tell me how good my cunt feels.” Ryan grunted, “You’re so tight and wet, Megan. Fucking you is incredible. Your ass looks amazing from here.” The slapping of skin filled the room, our panting mixing with dirty talk. I reached down to circle my clit, building the heat.
Sweat slicked our bodies as the pace quickened. I flipped around to face him, grinding down on his cock while my tits pressed to his chest. “Harder, Ryan. Make your stepsister come all over you.” He thrust up, hitting that spot that made me see stars, whispering praises between moans: “You’re so fucking sexy, taking my cock like this. Such a strong, horny girl.” My pussy clenched around him, orgasm crashing through as I came hard, juices dripping down his shaft. He followed right after, groaning my name as he pumped cum deep inside me, both of us sweating and breathless in the aftermath.
We collapsed in a tangle, his cock still twitching inside my wet pussy. I kissed his jaw, sarcastic smile back in place. “Not bad for a first free-use round, step-bro. But don’t think we’re done exploring this family dynamic—Jack’s stubble and those sweatpants have been on my mind too.” Ryan chuckled softly, pulling me closer. The night was young, and the house held more secrets than just his open door.
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