A brother and sister, both horny and alone in the house, can't resist the temptation to explore their forbidden desires. They start by sneaking glances at each other, then progress to masturbating in full view of the other, their bodies on display, their moans echoing through the empty halls. Their amateur sex tapes become a collection of their secret trysts, each encounter pushing the boundaries of their taboo relationship. They struggle to maintain their facade of sibling affection, their bodies betraying them with every stolen touch.