Yamagishi, Yoshino, Iida and Niiyama are groups of four close friends. Yamagishi secretly loved Iida for a long time but never confessed. Yoshino is always happy, especially very interested in sex. One day, Yoshino was showing off to Yamagishi about the newly bought fake cunt when Niiyama and Iida heard. Because of curiosity, she asked to go home to Yoshino to see that thing. Wondering how fake cunt had to use, Niiyama asked Yoshino to use right in front of her to observe. But Yoshino also had no way, his dick was still not erected. Yoshino immediately asked Niiyama to show him panties to masturbate, but did not expect Niiyama to immediately respond! And then the two gradually reached sex, right in front of Iida and Yamagishi. The two of them just silently stood watching their two close friends fuck each other right in front of them. But after fucking Niiyama, Yoshino called Iida again. Yamagishi thought that Iida would refuse, she could not do this because of curiosity. He thought so until Yoshino put his dick deep into Iida's cunt ...