The daughter-in-law, Reika, who was asked by her husband to care for her ailing father-in-law. However, it was actually to fulfill her husband's desire to be cuckolded... While caring for him, her father-in-law groped her buttocks and entangled his tongue with hers while chewing. Despite being subjected to vulgar sexual harassment, Reika endured desperately for her husband's sake. However, her body gradually became invaded by her father-in-law...