One day, while her older brother was helping her study, Nana kept saying, "Big brother, you're amazing!" as she watched him check her answers. Unaware he was still there, she eventually dozed off. "What the hell!" he shouted, but found himself aroused by the nape of her neck. Growing impatient as she remained asleep, he began escalating—peeking down her shirt, touching her thighs, then rubbing her through her panties. Suddenly, Nana woke up and passionately kissed him deeply. "Big brother, you're all pent up, aren't you? It's okay," she whispered, admitting she'd been restless lately from nothing but studying. She pushed him down, started jerking his cock, and licked his ears and neck. Worried their parents might hear, she silenced his moans with her hand while giving him a handjob, then continued with repeated blowjobs. Seeing her brother's rock-hard cock, Nana couldn't help muttering, "Wow..." Overcome with excitement, she guided his hand to her crotch and made him touch her. As he resisted, saying bareback was dangerous, she took the initiative and thrust him inside her. "It's dangerous inside!" he protested, but she trapped him with a crab clamp, refusing to let him pull out.