A married couple celebrating their 20th anniversary. Although they have a good relationship, the wife always feels that having sex has become obligatory. Through her mom friends, she learns about 'paizuri', which involves a man receiving oral sex while standing. One day, the wife asks her husband if he would like her to perform paizuri on him. They hold hands, caress each other's arms, share pillow talk, take a shower together, kiss again, and engage in cunnilingus... As the wife experiences heightened sensitivity during these intimate moments, so does her husband, becoming aroused multiple times throughout their encounter. Their bond strengthens even further due to the paizuri sessions they share...

結婚20年目を迎えた夫婦。夫婦の仲は良いがSEXが義務的になっていることを女は常に感じていた。女はママ友を通して‘後戯’があることを知る。ある日、女は夫に後戯をしてほしいことを告げる。手を繋ぐ、腕まくら、ピロートーク、一緒にシャワーを浴びる、もう一度キス、クンニ…そんな後戯をする上で女は感度があがり満たされ…夫も妻の姿を見て興奮し何度もSEXする。後戯によって夫婦仲がさらに良くなっていった…。