Turns out, I fucked up my calculations, but damn, I hit the jackpot. My dumbass thought her room was empty, but nah, my smokin' hot stepsister was there, naked and ready. One look at her killer curves and I was rock hard. She saw my dick, bit her lip, and that was it. Next thing I know, I'm pounding her tight pussy like there's no tomorrow. Whoops, my bad? Nah, best fuckin' mistake ever