In the quiet of his room, Magrinho, a scrawny teen with a surprising size, can't help but indulge in his morning habit. His hand wraps around his rock-hard cock, his grip tight as he pumps, his hips bucking slightly. Lost in his fantasy, he doesn't notice his sister's presence until she speaks, her voice laced with curiosity and a hint of desire. Caught mid-stroke, he freezes, his cock throbbing, before she turns and leaves, leaving him to finish, his heart pounding with a new, forbidden excitement.