While the older brother was tutoring his younger sister, she fell asleep. As he tried to wake her, he became aroused by her nape and hair, peeking at her panties and eagerly attempting to touch her. Suddenly, the sister wakes up—and immediately starts passionately kissing her brother. Though surprised, he gets drawn in by her words when he asks, "W-what are you doing?!" and she replies, "You were trying to do perverted things while I was sleeping, weren't you?" The two resume kissing, hungrily pressing their lips together. Seeing her brother's erect cock, the sister teasingly calls him a pervert and starts jerking him off. He responds, "What's wrong with that? I'm a guy, after all." She asks, "So you've always been looking at me like this?" while deliberately teasing his shaft. He writhes in excitement as she traces the underside of his cock with her finger and blows softly, asking, "Do you want me to touch you properly?" The sister teases his nipples—touching and licking—while gently whispering, "You want to cum, don't you? But not yet." He asks why, and she replies, "It's punishment for trying perverted things with your little sister." He questions, "Are you really okay doing this with your own brother?" She whispers in his ear, "Should I stop then?" while licking his ear. Trembling, he pleads, "No, don't stop..." As she continues jerking him off while sucking his nipples, she slides her tongue down to his crotch, teasing around his shaft. "You want me to lick it, right?" she asks. He nods. Slowly, she licks up his cock and takes it into her mouth, beginning a blowjob—repeatedly bringing him to the edge and stopping. Watching her brother overwhelmed with pleasure, she mutters, "It's annoying how only you're having fun," and begins face-sitting, grinding her wet pussy against his face. After climaxing intensely, they move into a 69 position. The sister then mounts him, ready to take him inside. "Huh? Aren't you going to use a condom?" he asks, but she replies, "No." She impales herself on his cock, and they enjoy various positions—cowgirl, reverse cowgirl, doggy style, spooning, and missionary. When the brother is about to cum, the sister clamps his balls with a crab clamp, forcing him to climax inside her. She whispers, "Big brother, cumming inside your little sister is so wrong."