Nerdy Little Step Sister Learns To Be Cool

I never thought my nerdy little step-sister, Mia, with her thick glasses, baggy sweaters, and endless stack of comic books, would ever ask me for help becoming "cool." But there she was, knocking on my bedroom door one Friday night, fidgeting in her oversized hoodie that hid her surprisingly perky tits and tight little ass. "Please, bro," she begged, her cheeks flushing pink. "I want to fit in at school. Teach me how to be like the popular girls." I smirked, pulling her inside and locking the door. "Alright, nerd. Lesson one: cool girls know how to tease." I grabbed her wrists, pinning them above her head against the wall, my body pressing into hers. She gasped, her big doe eyes widening behind those glasses as I ground my hardening cock against her thigh. "Feel that? That's what guys want. You gotta own it." She squirmed, but didn't pull away. "Like... this?" Her voice was shaky, innocent. I yanked off her hoodie, revealing a plain white bra straining over her C-cups, nipples already poking through. "Fuck yeah," I growled, shoving her onto my bed. I stripped her jeans down, exposing her cotton panties soaked right through the crotch. "Lesson two: cool girls get wet for it." I dove between her thighs, ripping the panties aside and burying my tongue in her slick, virgin pussy. Mia moaned like a pornstar in training, her hips bucking as I sucked her swollen clit, fingers plunging deep into her tightness. "Oh god, bro! That feels... so cool!" She came hard, gushing on my face, her glasses fogging up. But I wasn't done. "Time to learn how to ride." I flipped her over, ass up, and slammed my thick cock into her dripping hole. She screamed in ecstasy, pushing back like a pro, her nerdy whimpers turning to slutty demands. "Harder! Make me cool!" I pounded her relentlessly, slapping her ass red, pulling her hair until she squirted again, clenching around me. By morning, Mia was transformed—makeup smeared, my cum leaking down her thighs, begging for round two at the party tonight. "Thanks, bro. I feel so fucking cool now." And damn, watching her strut out like that, ready to own the world, had me hard all over again.