David has been brightening up his gray Surrey, England days with the porn collection hidden in his parents' shed, but when he finds that his older stepsister, Dawn, has discovered his magazines, things really begin to heat up.
Their parents insist that their just-graduated son look for a job, but their daughter has the week off and is determined to work on her tan. Distracted David finds himself increasingly tempted by his seductive older stepsister, who makes it very clear what she wants.
Her teasing ways slowly break down the taboo barrier between stepbrother and stepsister until they both give in to their lust, but what are they going to do about the feelings that have developed between them in the meantime?