Petite 18yo Stepsis Has a Crush on Stepbro

Mochi's a total bookworm grinding for that perfect GPA, so dates and parties are off the table. Only thing on her mind is you, her stepbrother, and that little secret hits the fan when you catch her rubbing her pussy raw. She thinks you're pissed at first, but the second she sees your grin she flips. "Fuck it," she says, peeling off her clothes like she's been waiting for this all semester. You both strip, her eyes go wide when your cock springs free, and she can't stop staring. She reaches out, wraps her fingers around the shaft, strokes it slow then faster while her own wetness glistens between her legs. Horny as hell now, she spreads out on the bed, fingers working her clit in tight circles just for you, hips bucking until she cums so hard her whole body shakes. Breathing heavy, she points to her tits and stomach and tells you to paint her. You stroke until thick ropes splatter across her skin, leaving her smiling like she just aced a test. Once exams are done she wants the real prize: you buried deep, pounding her until she creams all over your cock in one messy, shuddering orgasm.