An aggressive, sensual older sister visits her masochistic younger brother whose entire body is an erogenous zone, living together in the family home. She torments him by licking his cock, making him crawl on all fours, then orally stimulating his anus and giving him a moaning handjob until he writhes in ecstasy. Lost in pleasure but craving more thrill, she moves the action into the hallway, demanding sex. Though hesitant at first, his aroused instincts take over, and they begin thrusting together in doggystyle and reverse cowgirl positions. They quietly enjoy intercourse for a while, muffling their moans—until suddenly, a family member returns home unexpectedly, leading to an intense new turn of events.