When the brother comes home from school, he finds his sister Asuka sleeping in her uniform in the living room. He tries to wake her up, but gets excited when he sees her panties. He peeks at her panties without Asuka noticing, and smells her hair, and his penis gets erect. The brother starts masturbating while smelling her feet. When Asuka wakes up, he finds his brother masturbating while smelling his feet. He is surprised. He makes various excuses, but he can't escape. The brother kneels down. He tries to leave, whispering, "I'm really sorry, I'm really sorry." Looking at his brother like that, Asuka says, "It's weird to be aroused by your sister. You've been pent up, haven't you? If he promises not to do it again, she offers to help him get it out just once. The brother says he wants to smell Asuka's feet, and while smelling them, he strokes his penis. The brother still doesn't cum, so he asks her to sit on his face. Still, he doesn't cum. While still sitting on his face, Asuka gives him a handjob and even a blowjob, but he doesn't cum. Asuka says, "We're siblings, so I can't put it in, but I can just rub it, so please use that to cum, big brother." Then she starts doing sumata. He accidentally gets in while doing sumata. Asuka says, "Oh, wait... big brother... it went in," but her brother is so engrossed in it that he doesn't notice. He continues thrusting and cums inside her. Asuka says, "You're so stupid, big brother."