"Which do you prefer, the S version of me or the M version of me...?" Clever, cute, slender E-cup beauty Rio Kuriyama's 6 first-time challenges, 220 minutes, 4 main episodes, IPX-559

The adorable and outstanding eldest sister, Rio Kuriyama, is not only here to challenge herself with sexy exploration, but also to engage in slutty activities, uncovering her "S" and "M" duality! You definitely have to watch it!