While helping his sister with her studies, he falls asleep and the brother wakes up to find his sister asleep. The brother tries to wake her up, but he is aroused by her nape and hair. When he tries to look at her panties, the sister wakes up. Without a moment's hesitation, he gives her a deep kiss. Brother: "Wh, what are you doing?" Sister: "What are you doing? You were trying to do something naughty while someone was sleeping, weren't you?" Brother: "..." The sister gives him a deep kiss again. Sister: "Please do it all the way to the end. You always do that, don't you?" Brother: "N-no, that's not true!" From there, the two of them kiss greedily. The sister looks at her brother's erect penis and says, "You're a pervert for getting fully erect after doing this with your sister," while giving him a handjob. Brother: "It's fine! I'm a man too." Sister: "Have you always looked at me like that?" She touches his penis in a teasing manner. The brother is getting excited. The younger sister blows on her nipples while tracing her fingers, teasing her brother by asking, "Do you want me to touch you more properly?" and "Do you want me to squeeze and stroke you?" The older brother writhes in excitement. The younger sister touches and licks his nipples while giving him a handjob, saying, "You want to cum, don't you? But not yet." The older brother asks, "Why?" The younger sister whispers in his ear, "Well, shall we stop?" and licks his ear. The older brother shudders and says, "No, don't stop." The younger sister starts to enjoy herself and gives him a handjob while licking his nipples. She slides her tongue towards his crotch. She doesn't lick his dick right away, but teases him by licking around it. The younger sister asks, "Do you want me to lick you?" The older brother nods. The younger sister teases him, sticking out her tongue and slowly licking up his balls, before taking his dick in her mouth and slowly sucking it. She stops just before it reaches the climax. Seeing her brother getting so excited, the younger sister says, "It's annoying that only you seem to be enjoying it, big brother." and sits on his face. The younger sister presses her pussy against his face, getting so excited. After cumming again and again, they do 69. The younger sister tries to insert her penis in the cowgirl position, and he asks, "What? Aren't you going to put on a condom?" The younger sister says, "No, I don't," and inserts it. They do it in cowgirl, reverse cowgirl, doggy style, side position, missionary position. Finally, when the older brother is about to cum, the younger sister does a crab position. The older brother cums inside her. The younger sister says, "Big brother, it's bad to cum inside your sister."