He meets his big-breasted sister while visiting a friend's house. She's curious about him being younger than him, and starts asking him questions like, "Do you have a girlfriend?" and "Make sure you use proper birth control." However, when she suddenly has a drink... the man gets an erection as he watches his sister gradually become wild, and his sister, seeing his dick, becomes aroused, and despite what she says, she actually prefers it raw. He can't resist inserting it raw and even cumming inside her!