In the dimly lit attic, siblings Emma and Jack huddle together, their breaths visible in the chilly air. Jack's hand finds Emma's thigh, his fingers tracing the hem of her skirt. Emma's heart races, her body responding to his touch. She shifts, allowing his hand to explore further, his fingers finding her wet panties. He rubs her through the fabric, her moans soft but audible. Emma reaches back, grabbing Jack's cock through his jeans. He's hard, his length throbbing against her palm. She unzips him, freeing his cock, stroking it as he continues to tease her. Their touches become more urgent, their bodies pressing together. Jack turns Emma around, bending her over a nearby trunk. He lifts her skirt, pushing her panties aside, and enters her from behind. They move together, their bodies slapping together, their moans echoing in the attic as they give in to their incestuous desires.