In a private challenge fueled by teenage hormones and taboo, three siblings push each other's limits in a depraved game of sexual one-upmanship. Starting with eager, sloppy blowjobs, they explore each other's bodies, their inexperience evident but no less intense. As the competition escalates, they graduate to a full-blown threesome, their lithe, youthful forms writhing together in a tangled web of incestuous lust. They push each other to the brink, their cries of pleasure echoing through the house, leaving them all sated and guilty, their secret forever buried.