Isolated in their cramped quarters, a brother and sister, both burdened with religious guilt, find their faith tested by their insistent desires. As they huddle close, the sister's ample breasts press against her brother's chest, igniting an undeniable spark. His throbbing erection tenting his pants, he struggles to maintain composure. She, too, feels the familiar ache between her legs, her panties growing damp with each whispered prayer. Unable to resist their forbidden yearning, they succumb, their hands exploring each other's bodies with a hunger born of months of denial.