A brother and sister, both 18, find themselves isolated and horny during a summer vacation. They tentatively explore each other's bodies, their innocence and curiosity driving them to new heights of pleasure. She tentatively touches his cock, feeling it grow hard in her hand. He responds by exploring her pussy, finding it wet and ready. They struggle with their guilt and the taboo of their actions, but their desire is too strong to resist. They finally give in, fucking each other with a passion they've never known, their bodies slick with sweat and cum.