A brother's uncontrollable desire for his sleeping sister leads him to a taboo act. He gently spreads her legs, positioning himself between them. His cock, already hard and throbbing, finds her entrance, and he pushes in, inch by inch, until he's fully sheathed in her warmth. He begins to move, slowly at first, then with increasing urgency. His sister moans softly in her sleep, pushing back against him. As his orgasm approaches, he pulls out, watching as his creamy load spills onto her pussy and thighs, marking her as his.