妻に先立たれた義父と夫の3人で幸せな結婚生活を送っていた「くるみ」。しかし、義父の自慰姿を偶然見てしまい、暴走した義父にヤられてしまう。その日から毎日のように繰り返される種付け中出し性交!旦那とは違う義父の凄テクと種付けの快楽に流され…夫が家にいるのもおかまいなしにハメ狂う背徳不倫。
Kurumi lives a happy married life with her husband and father-in-law, who lost his wife. However, she accidentally sees her stepfather masturbating and ends up getting fucked by her stepfather who goes out of control. Seeding creampie sex repeated every day from that day! She is carried away by the amazing technique of her father-in-law, who is different from her husband, and the pleasure of insemination...an immoral affair that goes crazy without caring that her husband is at home.