In the dim light of the closet, Michelle's fingers tremble as she wraps them around her brother's massive, pulsating cock. Lucy, eyes wide with shock and curiosity, watches as Michelle begins to stroke him, tentatively at first, then with growing confidence. Their brother's breath hitches, his hips jerking forward slightly. Michelle's hand glides along his length, feeling every vein and ridge. Lucy's own body responds, her pussy throbbing with a new, intense ache. She reaches out, her fingers brushing Michelle's, both sisters now touching their brother's cock, their piety crumbling under the weight of their forbidden lust.