When Rio Kuriyama's brother-in-law, Yuta, came to stay for his job hunting, she initially welcomed him with a smile. However, Yuta, who secretly harbored feelings for her, began to sneak peeks at her underwear and their intimate moments. Despite sensing his lecherous gaze, she pretended not to notice. Driven by his desires, the beast within him relentlessly attacked her. Rio experienced multiple orgasms from his relentless pounding, sensations she had never felt with her husband. Eventually, the pleasure resonating in her womb began to dominate her very being...