A young sister and brother, both barely legal, find themselves alone in the house. Boredom leads to curiosity, and soon they're sharing secrets and fantasies. The brother confesses his desire to see her naked, to touch her in places he knows he shouldn't. The sister, intrigued and excited, agrees, but only if they do it in the shower. They sneak into the bathroom, their hearts pounding as they undress each other. The brother's hands shake as he touches her soft breasts, her hard nipples. The sister gasps as she feels his cock, hard and ready, against her thigh. They slide down the wet tiles, their bodies entwined, their lips locked in a passionate kiss as they explore each other's bodies for the first time.