The perfect older sister who is envied by everyone, with excellent grades, good looks, and good manners, is actually a pervert who loves drinking her younger brother's semen. It's natural for her to sneak into her brother's room, and she enjoys the thrill even in front of her parents. A strange incest fantasy between an adolescent younger brother who is about to take an entrance exam and a perverted older sister who instinctively squeezes the semen out of her younger brother!