A family of three living together as a married couple. The husband's mother-in-law, Iku, resides with them, and they decide to renovate their home. Due to construction, they must share a single room for about a week. On the first night, unable to sleep from nervousness, he finds himself unable to look away from his stepmother's body lying beside his wife. His gaze fixates on her cleavage, inching closer, wanting to touch her nipple—but he holds back. The next night, while his wife sleeps soundly, he can no longer resist the sight of his stepmother's massive breasts swaying gently. Lying beside her, he indulges in their softness. Driven by curiosity, he slips a finger toward her crotch—and the moment he feels her wetness seeping out, arousal overwhelms him. He rushes away to the bathroom and vigorously jerks off his cock. The following morning, his stepmother whispers softly in his ear: "I'm not mad about what happened yesterday." Her words shake him to the core. That night, he awakens to a pleasant sensation—his stepmother is between his legs, sucking his cock. Startled, he tries to pull away, but she says, "You touched me yesterday, didn't you?" With that, she takes his cum into her mouth and swallows it all.