Two innocent sisters, haunted by religious guilt, find solace in each other's arms. They slip into their stepbrother's room, their eyes drawn to the bulge in his pants. Without a word, they unzip him, their small hands wrapping around his virgin cocks. They lick and envelop the penises, their innocent faces now filled with lust. "You mustn't move," their father commands, but the girls are lost in their own world, their tight, untouched vaginas rubbing along the hard shafts. They fall into a frenzy of lust, their moans filling the room until they collapse, spent and ashamed, their bodies marked with their taboo sins.