His sister's lover but he let her play

Like many other JAV movies about hot little girls, today Nono Yuki, a seemingly new idol, has a pretty cute face and a body with big, round, plump breasts. nipples are not as dark as other girls :D. With her lustful love, when her sister brought her boyfriend home to visit, she saw her sister's lover and just wanted meat, because the guy was also quite shy and gentle, he and her sister were probably still together. have not had sex with each other. With the strength of being younger and more beautiful than her sister, and her body being more attractive, how could her sister's lover be able to withstand Yuki's charm?