An 18-year-old, alone in his room, can't resist the urge to explore his hardening cock. He strips off his clothes, revealing his big, round ass, and takes his stiff cock in hand. Slowly, he strokes it, feeling the vein running along its length. His other hand reaches around, squeezing his firm cheeks, imagining someone else's touch. He leans back, legs spread, and fingers his tight hole, moaning at the sensation. His cock grows slick with pre-cum as he pumps it faster, his ass clenching with each thrust. He's close, his breath coming in ragged gasps, when suddenly, he hears footsteps outside his door. He freezes, heart pounding, as the doorknob turns.