Bored and curious, a sister sneaks into her brother's room, finding him sleeping with his boxers tented. She can't resist the urge to explore, gently pulling down his underwear to reveal his hardening cock. She tentatively licks the tip, tasting his salty precum, before taking it deeper into her mouth. Her brother wakes up, surprised but aroused, as she continues to suck him, enjoying the feel of his thick shaft on her tongue.