The house was quiet that night, the kind of stillness that only comes after midnight in a suburban home. Raj, at 20, lay awake in the shared bed he still occupied with his younger sister Priya, who had just turned 18 a week ago. Their parents' room was down the hall, but the siblings had always shared this space since childhood, a habit that lingered longer than it should have. Raj's mind raced with the confession his friend had made earlier that day—how he'd finally crossed that line with his own sister, describing the raw thrill of it all. The thought ignited something forbidden in Raj, a burning desire to claim Priya in the same way. She was right there, sleeping innocently beside him, her soft breathing a tempting rhythm.