The cocky gyaru sister comes home from school and changes clothes, unaware her brother is secretly watching. She confronts him, "You were peeking while I changed, weren't you?" He fires back, "Do you really think I'd get turned on by your panties?" and snaps, "No guy in the world would get excited over your underwear!" Enraged, she yells, "Huh? You really said that?" kicks him down, and mounts his face in a dominant cowgirl position. Overpowering him, she demands, "How does it feel getting face-ridden by your sister?" then binds his arms tightly with duct tape, completely immobilizing him. "I'll give you that electric massage I used to do when you were little!" she declares, spreading his legs wide and locking into the perfect electric massage position. Confident she'll make him climax, she takes full advantage of his helplessness. After bringing him to defeat with the vibrator, she teases his sensitive tip with her toes, laughing, "C'mon, c'mon—torturing the head now! It's super ticklish right after cumming, huh? w" Even when Rin questions, "How does it feel getting wrecked by your sister's electric massage?" he defiantly shouts, "I didn't cum! There's no way I'd let you make me climax!" But she straddles his hardening cock, grinds her pussy against him, and taunts, "Look at this—getting turned on while your sister grinds on you? Getting hard again? w" determined to force him into another defeated orgasm. Alternating between face-sitting and electric massage, she provokes him, "Fine, I'll just make you cum again!" driving him toward submission. After securing his climax, she gloats, "How's it feel getting made to cum by your sister's electric massage? Pervert!" reveling in her victory. Still unsatisfied, she presses two vibrators directly onto his freshly sensitized cock, forcing him to verbally admit defeat. "Say it—confess that ever since ●● Elementary, you've been cumming from Rin's electric massages! Go on, say it! Or things might get really bad for you? w" asserting total control. But the brother isn't one to back down—later, he sneaks into Rin's room while she sleeps, handcuffs her, and takes revenge with relentless tickling and his own brutal electric massage. ※Facial exposure in main feature