Takeshi and Daisuke are two best friends who have played together since childhood. Recently, the sex story of the two families is decreasing, there is no longer a sexual desire, causing the marriage to become deadlocked. Faced with this situation, Daisuke immediately suggested that Takeshi... change wives for each other. On the occasion of the two families gathering, Takeshi immediately told Sakura about Daisuke's proposal. Sakura was a little hesitant but after being convinced by Takeshi, she agreed. So Takeshi and Yuna would proceed first, and Sakura and Daisuke would witness the two of them. Watching her husband fuck another girl naked right in front of her husband. They didn't even wear condoms and her husband ejaculated straight into Yuna's uterus! Not only that, but Daisuke also took out his cock and cummed right in front of her. Seeing another man's cock make her even more excited, her underwear has been soaking wet for a long time. And after the two of them went to take a shower, she and Daisuke went into the couple's bedroom and fucked each other right there. After this time, Sakura was no longer as shy as before. The four of them are always comfortable naked when they are indoors, playing cards and playing "guessing" with each other, fucking each other whenever they want. The husband and wife's relationship also seems to gradually become closer...