Strangers to each other, a brother and sister, both in their early twenties, find themselves alone in the house. They start tentatively, sharing intimate stories, then graduate to playful touching. The sister, curious and aroused, takes the lead, kissing her brother's neck as he hesitates. She guides his hand to her breast, then grips his hardening cock through his jeans. He surrenders to her touch, exploring her body in return, their amateur lovemaking filled with discovery and raw passion.