Caught red-handed, the curious sister peeks into the bathroom, her eyes widening at the sight of her brother stroking his hard cock in the shower. His moans of pleasure echo through the steamy room, enticing her to join. She hesitates, then slips off her clothes, revealing her toned body. He invites her in, and they wash each other, their hands exploring intimately. She lathers soap on his cock, making him groan. He returns the favor, slipping a finger into her wet pussy, making her gasp. Their bodies press together, the hot water cascading down as they give in to their desires.