In the confines of their shared home, a curious sister can't help but sneak glances at her brother's impressive endowment. One day, she catches him masturbating, and her desire ignites. She starts touching herself, her moans echoing through the house. He discovers her, and instead of being angry, he's intrigued. They begin a taboo dance of lust, exploring each other's bodies, until their intense passion is interrupted by an unexpected visitor.