A beautiful woman named Ai lives together with her husband and his parents in two households. Although their relationship appears harmonious, she finds herself unsatisfied sexually due to her husband's lack of interest. Every night, she relieves her pent-up desires through self-pleasure. One day, while watching TV, she catches a glimpse of her son-in-law Takashi's massive cock. Intrigued by its size, she offers to take care of him instead. She seduces him both day and night, draining him of his cum. As time passes, her stepson becomes increasingly enamored with her alluring scent and motherly charm...

娘夫婦と夫で2世帯同居をしている絢。表向きは円満だが夫との営みはご無沙汰で、持て余した性欲を毎晩、自慰で発散していた。そんな時、同じように娘とセックスレスで一人寂しく発散していた娘婿・タケシのデカチ〇ポを目撃して…。彼の肉棒に心奪われた絢は「私が代わりにお世話してあげる」と昼夜問わず彼を誘い、搾精し続ける。そして嫁にはない義母の妖艶な色香にすっかり魅了された娘婿は…。