Yamagishi, Yoshino, Iida and Niiyama are a group of four close friends. Yamagishi had secretly missed Iida for a long time but had never confessed. Yoshino is always happy, especially very interested in sex. One day, Yoshino was bragging to Yamagishi about his newly bought fake pussy when Niiyama and Iida overheard him. Out of curiosity, she asked to go to Yoshino's house to see it. Wondering how to use a fake pussy, Niiyama asked Yoshino to use it right in front of her for her to observe. But Yoshino ran out of options, his cock still hadn't gotten an erection. Yoshino immediately tried to ask Niiyama to show him his underwear to masturbate, but unexpectedly, Niiyama immediately responded! And then the two gradually move on to sex, right in front of Iida and Yamagishi. The two of them just stood quietly watching their two best friends fuck each other right in front of them. But after fucking Niiyama, Yoshino called Iida again. Yamagishi thought that Iida would refuse, she couldn't do this out of curiosity. He thought so until Yoshino thrust his cock deep into Iida's pussy...