My sister Nene, who is about to get married soon, has always been very particular about cleanliness. She was so worried that she wouldn't be able to kiss her fiance, Izumi, during their wedding ceremony because of her fastidiousness. She asked my brother Yusuke to help her practice kissing beforehand. As they practiced together, Nene wondered if she would be able to successfully kiss Izumi on their wedding day and if her relationship with Yusuke... Their tongues entwined, saliva mixing, and before they knew it, their make-out session had become more than just a practice. They were lost in the heat of passionate, taboo incestuous sex.

もうすぐ結婚が決まっている姉・寧々は婚約者・泉とキスが出来ない程の潔癖症だった。結婚式での誓いのキスが上手くいかない事を危惧した寧々は、弟・友樹にキスの練習相手をお願いした。寧々は、泉と無事キスができるのか、友樹との関係は…。じっとり絡み合う舌、ねっとり混ざり合う唾液、キスの練習がいつしか本気になってしまった2人。禁断の近親相姦NTRセックス。