Five years into their marriage, the Shiromine couple return to their in-laws' countryside home for summer vacation. Miu dreads the visit—her perverted father-in-law and the oppressive rural atmosphere make her uneasy. But as night falls, her father-in-law's stealthy tongue begins to creep closer. Though she once hated cunnilingus, his relentless, sticky oral play slowly draws her in. Overwhelmed by pleasures her young husband could never provide, Miu finds both her mind and body succumbing to his intimate torment. A deeply satisfying NTR scenario unfolds as she's helplessly swept away by her father-in-law's forbidden passion.