Their father's voice echoes in their minds, "You mustn't move," yet their bodies betray them. The sister's hands, once clasped in prayer, now tentatively reach for her brother's cock, her fingers tracing the hard length through his pants. The brother, equally conflicted, rubs against her, feeling her tight, untouched pussy through their clothes. Their lips meet in a fierce, hungry kiss, their bodies writhing together as they shed their remaining inhibitions. As they collapse into a tangle of limbs, spent fluids, and smeared juices, they pray for forgiveness, their taboo lust forever etched in their memories.