The term "NSFS" stands for "Not Safe For Work," indicating that the content is not suitable for viewing in public or professional settings due to its explicit nature. The specific content you're referring to seems to involve an intimate scene featuring a woman and her husband, Rio Nagaregawa, an individual who might be known within certain circles, possibly for his involvement in adult content or as a model/actor in adult films.
The theme of a wife dancing in front of her husband is actually a popular niche in JAV. It's often called "Netorase" (寝取らせ), a genre where a husband allows or encourages his wife to have sexual experiences with others. The term "NSFS" stands for "Not Safe For
