Kaoru, who once married off her daughter, now lives peacefully with her husband. Though they love each other deeply, her husband has recently developed ED, leaving Kaoru's sexual desires unfulfilled and nearing their breaking point. Around this time, her daughter and son-in-law purchase a secondhand house, and Kaoru and her husband are invited over to celebrate. The property impresses them both, and they're thrilled for the young couple's new beginning. One night, however, Kaoru heads to the bathroom and stumbles upon a shocking sight—her son-in-law masturbating. She notices the thick, white fluid being released and realizes it's his semen. Unlike her husband's weak ejaculations, the powerful arc of his cumshot sends a sharp thrill through her womb. The next day, while her husband and daughter go out, leaving Kaoru behind, the son-in-law dozes off in the living room. Glancing around cautiously, Kaoru approaches him, slowly pulls down his pants, and feels his thick cock through his underwear. Overcome with the urge to devour it, she gently strokes it instead. Instantly, his cock swells hard. Unable to resist, she pulls it out through the gap in his pants and begins moving her hand up and down lightly. His shaft grows even firmer, and Kaoru drools as she smoothly jerks him off. Finally, she takes it into her mouth, sucking it hungrily, savoring every inch. Trembling with excitement and pleasure, she suddenly feels a massive burst of cum flood her mouth. The deep throat impact and strong masculine scent push Kaoru herself over the edge—she climaxes violently.