His mother's friend Mayuka, who moved far away to accompany her husband on his job, has come to Tokyo for the first time in a long time. Yuzuru's son is excited to meet the woman he has admired since childhood... That night, under the influence of alcohol, the two cross the line. Despite feeling guilty, they become more and more absorbed... Yuzuru is absorbed in the pleasure he Kokoro no matter where he is. Mayuka is also shaken by the pleasure of a cock she has not experienced in a long time, and although she is unsure, she continues to be swept away...