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Your stepsister, all curves and muscle, stumbles in from the gym, her body overheated and primed. Her exhaustion is your invitation, and you seize it, cornering her against the wall. Your hands grip her ass, lifting her, and she wraps her legs around you, her breath ragged in your ear. You grind against her, your cock throbbing, and she gasps, "Fuck me, brother." You do, slamming into her, your bodies slick with sweat, until you're both spent, your seed dripping down her thighs.