In the dimly lit bathroom, a brother and sister, both dressed in towels, find themselves alone. She's just showered, her skin glistening, and he's about to. As he steps in, he sees her, wet and vulnerable. Lust clouds his mind, and he drops his towel, revealing his hard cock. She watches, licking her lips, then joins him, their bodies pressing together. He pushes inside her, filling her tight pussy as she gasps, clawing at his back. Water rains down, their moans echoing, until they collapse, spent and guilty, in the sudsy aftermath.