Satomi, feeling frustrated due to her nightlife disappearing after moving in with her father-in-law (her husband's stepfather), starts an affair with her boss at work. However, their secret is exposed when her lover's wife finds out about them. Enraged, her father-in-law demands physical intimacy from her despite her refusal. Despite trying to resist his advances, she eventually gives in to his forceful touches and is creampied against her will. From that day onward, Satomi becomes a plaything for her insatiable stepfather, who can't help but indulge in her voluptuous body whenever he sees her.

夫の父親（義父）と同居したことによって夜の生活がなくなり欲求不満になったさとみはパート先の上司と不倫。それが義父にバレてしまい怒られ体を求められる。拒絶したものの強引な愛撫に女盛りなさとみはなすがままになり中出しされてしまう。その日以来性欲絶倫な義父は顔さえ見ればところかまわず巨乳で豊満な体をしている嫁のさとみを好き放題やりまくる。