母に付き添って仕方なく親戚旅行に同行した良和。そこで叔母・菜々美の扇情的な肉体につい目を奪われてしまい…。その夜、眠れず一人で風呂に入っていると、汗を流しに来た菜々美と偶然鉢合わせ。そこで彼の逞しい勃起チ●ポに欲情してしまった彼女は、堪らずむしゃぶりついて…。妖艶な叔母の手ほどきに性の悦びを知った良和は狂ったように彼女を犯し、中出しをし続けた。そして夫で物足りなかった菜々美もそれに応えるかのように悶えイキ狂い…。

Yoshikazu reluctantly accompanied his mother on a trip with relatives. There, he was captivated by the seductive body of his aunt, Nanami… That night, unable to sleep, he took a bath alone and accidentally ran into Nanami, who had come in to wash off the sweat. There, she became aroused by his strong, erect penis and couldn't resist pounced on him… Yoshikazu, having discovered the pleasures of sex through his seductive aunt's guidance, went wild, ravishing her and repeatedly ejaculating inside her. And Nanami, who had been unsatisfied with her husband, responded in kind, writhing and climaxing wildly…