Their secret meetings in the attic have become a ritual. The sister, always dressed in modest attire, finds herself under her brother's intense gaze. He commands her to remove her clothes, to reveal her body to him. She hesitates, but his words, laced with dominance, make her comply. She slips off her dress, standing before him in just her panties. He orders her to touch herself, to show him how she likes it. She obeys, her fingers tracing circles on her clit, her breath hitching as she grows wetter. He watches, his cock throbbing, until he can no longer resist. He joins her, his cock sliding into her, making her his in their forbidden dance.