In the sultry bathroom, the busty sister, her big tits heaving, steps into the tub, water cascading over her curves. She lathers up, her hands caressing her large, firm ass. Her gaze wanders, landing on her reflection, and she begins to touch herself, fingers tracing her wet pussy lips. Suddenly, the door creaks open, revealing her brother. She gasps, but he's captivated by her naked form, his cock bulging in his pants. She beckons him, and he tentatively steps closer. She reaches out, stroking his cock through his jeans, feeling it grow harder. He hesitates, then unzips, his thick, veined shaft springing free. She leans in, taking him deep into her mouth, gagging slightly but eager for his load.