A female student's younger sister is fast asleep with her panties exposed. Her older brother is excited by the sight of her panties and immediately grabs his dick to jerk off. However, she soon notices and he treats her as a pervert for lusting after his younger sister, but he gradually starts to feel sorry for her. The younger sister is worried that he might turn into a pervert, so she gives him a handjob and a blowjob, saying, "Are you pent up? I'll help you get it out." However, her older brother is having a hard time cumming, so the younger sister, who is getting impatient, says, "I can't put it in, but I'll just rub it!"